Re: [CentOS] RH Server/Client disk sets -> Centos; how?

[John R Pierce]

Paul Johnson wrote:
> What I really want to ask here is: what is the relationship between
> the several RHEL install types and the Centos disks? Does Centos
> collect up all the SRPM/RPM packages from both RHEL Client and Server?
>   

centos corresponds to the advanced server version, which includes all 
features   the other versions have increasing restrictions and reduced 
package features.You can sort the RHEL limitation shere 
http://www.redhat.com/rhel/compare/


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[CentOS] RH Server/Client disk sets -> Centos; how?

[Paul Johnson]

I'm running Centos on 12 machines.

Colleague runs Redhat Enterprise Linux and while studying his system,
I see some gibberish/complication about his system being a "Client"
install, not a "Server" install.  Apparently, RH provides completely
different disk sets for Server and Client installs. I've gone to the
RH website and read about the difference between Client and Server,
but I still don't understand why they make 2 different disks.  In the
"old days" of RH, there would be 1 set of disks, and when the install
began, you would choose "server" or "workstation" as a way of choosing
a default set of packages, and then you could freely pick and choose
additional things.  You could install gnome on a server, or an http
server on a client.

Centos seems to follow the good old RH packaging approach.

This RHEL Client/Server thing actually causes some wrinkles if you try
to transition a running system from RH to Centos, because the
repository names are different.  RH will have a version name like
"5client" whereas Centos will just have 5.

I understand this Centos list is not quite the right place to ask "why
does RedHat do that?", but I bet some of you will know.

What I really want to ask here is: what is the relationship between
the several RHEL install types and the Centos disks? Does Centos
collect up all the SRPM/RPM packages from both RHEL Client and Server?

-- 
Paul E. Johnson
Professor, Political Science
1541 Lilac Lane, Room 504
University of Kansas
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[CentOS] Rescan for new geometry without reboot?

[Amos Shapira]

Hello,

We just had our servers fitted with more disks. Most of the disks are
growing existing RAID 1+0 channels, some are in new channels.
Controllers and disks support live installation.

I'd like to avoid a reboot just to let the system find that the disks
are larger.

All I can find so far suggests that its possible to rescan the disks,
and even find the new geometry (e.g.
http://linux.derkeiler.com/Mailing-Lists/Kernel/2004-12/1555.html) but
nobody knows how to actually convince the system to let me use the
extra space without a reboot.

Does anyone know of a way to achieve this?

Thanks,

--Amos
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Re: [CentOS] openfiler (was: using CentOS as an iSCSI server?)

[Ross Walker]

On Oct 20, 2009, at 6:47 PM, Alan McKay  wrote:

>> I thought the original object was to make the space available to
>> multiple VMware ESX(i) servers so you could vmotion guests among  
>> them.
>> Can ESX construct raids out of multiple iscsi sources?
>
> Well, my original may have been a bit obtuse because I do not really
> know what I am looking for :-)
>
> I have a bunch of local disk all over the place.   I eventually want
> to virtualize everything, so I'd like a way to virtualize that
> localdisk and do fancy things with it :-)

If you have a bunch of disperse local disks you could export them via  
iSCSI or AoE or NBD to a head server that could then use mdraid and  
LVM to then aggregate that storage and share it out again to clients,  
ESX hosts and VMs via NFS/CIFS or iSCSI depending on their needs.

I myself use XFS over NFS for guest OS disks, then have iSCSI provide  
storage for the apps inside the guest VMs.

With a good storage controller this proved to be both the best  
performing and easiest to implement.

If you are aggregating disperse storage you could even use simple  
network storage protocols like AoE or NBD on the local storage servers  
and use RAID10 on the head server to make it fault tolerant.

-Ross
  
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Re: [CentOS] full-fledge PDF editor for Linux

[MHR]

On Tue, Oct 20, 2009 at 5:14 PM, Rob Townley  wrote:
>
> Acrobat isn't easy to use either.  i find it kinda clunky and not
> intuitive.  Maybe it is the nature of vector graphics and text.
>
> InkScape for graphics imports / exports pdf.
> The SVG can be edited in theory in a text editor because it is XML.
>
> ps2pdf  <-->   pdf2ps
>
> xhtml2ps | ps2pdf

I have had problems with ps2pdf - a lot of the time it just plain
fails, especially if the output is fancy-formatted (like dual
columns).

OpenOffice can export its documents as pdfs, which can provide a lot
of the functionality, but as for editing an existing PDF, I don't know
of a cheap, simple solution.  Acrobat is probably the best, and it's
expensive (by my budget framework).

mhr
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Re: [CentOS] "conventional cluster management software"

[nate]

Alan McKay wrote:

> My main areas of interest are :
> - DB clustering (PostgreSQL) - yeah, we're looking at commercial stuff
> and skytools

No DB clustering here, though if I had to pick I'd probably go for
Oracle RAC. MySQL clustering doesn't seem good, Postgres sounds
interesting, their EnterpriseDB grid stuff perhaps, haven't looked
too much into it.

> - web server clustering - Apache on CentOS

The web servers I manage serve about 2 billion requests a day on
CentOS 5.2, no clustering, we use load balancing with commercial
load balancers, currently F5 LTM, though will be evaulating Citrix
Netscaler soon. The servers run java/tomcat from original sources,
so despite having an older version of the OS there really isn't
much security risk. Any network-based attacks are thwarted by the
load balancers (such as the recent Apache slow DOS attack).

F5 runs all of their gear on CentOS as well, at least everything
that runs TMOS (which covers GTM, LTM, and a few others as well
I think). It is a stripped down version.

Don't let that make you think you can grab their software and
install it on your own server though, their licensing will
prevent that from happening.

> - storage clustering

Using commercial solutions here too, our NFS cluster from Exanet
does run on top of CentOS 4.4, though they use their own hardware
(IBM X3650) to make it as supportable/stable as possible. These
are NAS head units only they rely on another storage system
in the back end for the raw disk space to serve to clients.

At my previous company I was planning on implementing a GFS cluster
on top of RHEL and VMware with a fiber channel/ raw device map
back end for NFS. Though didn't have time or budget to do it
before I left. Such a solution for my current company would
be torn to shreds as it doesn't scale nearly as well.

Our back end storage from 3PAR runs on top of Debian, you'd never
know it was Debian unless you telnetted to it on port 22 to see
the Debian SSH banner(I like to poke around).

Clustering is a really complex thing to get right, it can often
cause more problems than it would otherwise prevent. Even some
high end clustering is really poor. A couple of jobs ago I had
to use BEA Weblogic application clustering for a massive J2EE
app. Ran us roughly $10 or was it $20k per CPU. We had major,
major outages with that thing. Most of the time we(and BEA)
were able to trace it to the weblogic cluster itself.

So think long and hard about what your trying to accomplish,
and if there is another way to get there without relying on
clustering. When I say clustering I mean pretty tight integration
between the systems in the cluster, where if one box can go
whacky it can take the rest of the cluster with it.

nate

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Re: [CentOS] Calling all Hackers from Big stan

[ML]

> Well,  alot of education out there by watching movies, however noone  
> ever brought up the most complex driven sub-culture of geeks and  
> nerds worldwide.
>
> THE MATRIX (muhahahahah)

Well, all trinity really did was run nmap, big deal

he he

-Jason
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Re: [CentOS] Calling all Hackers from Big stan

[Christopher Chan]

Please take this elsewhere. We do not care about compromised cpanel 
rubbish. Nothing to do with Centos because it is NOT Centos.
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Re: [CentOS] Karanbir's disks (was: openfiler )

[Christopher Chan]

Christopher Chan wrote:
> Alan McKay wrote:
>   
>> On Tue, Oct 20, 2009 at 6:14 PM, Karanbir Singh  wrote:
>>   
>> 
>>> I have this running in production. only not with 2 machines, but with 4
>>> machines, doing raid-10 ( not mdraid10, but conventional 2 sets of
>>> raid-1's 0'd )
>>> 
>>>   
>> Can you give more detail on what you've got there?
>> Sounds interesting.
>>
>>   
>> 
>
>
> ...four disk setup like so:
>
> sda+sdb = md0 (raid 1)
> sdc + sdb = md1 (raid 1)
> md0 + md1 = md2 (raid 0)
>
>
> A pretty common setup that was possible during installation since RH9 
> (not all through anaconda though, older distros needed some manual 
> command line intervention using Alt-F2 for a shell)
>   

Oh, missed the export as iscsi-target part.
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Re: [CentOS] 5.4 at last?

[Mathew S. McCarrell]

On Tue, Oct 20, 2009 at 8:08 PM, fred smith
wrote:

> Now that it appears that some folks are able to get the 5.4 downloads
> (and a GREAT BIG THANK YOU to all the centos team members who make this
> possible!) I'm wondering when the updates will begin flowing so that those
> of us running 5.3 can do "yum upgrade" and enjoy all the benefits too?
>
> Thanks in advance!
>
>
You must be patient!  Many of the mirrors (including the one that I
maintain) are still syncing 5.4 due to issues that arose.  Wouldn't you
prefer to pull your packages from a mirror that won't give you 404s?  :D

Matt
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Re: [CentOS] Karanbir's disks (was: openfiler )

[Christopher Chan]

Alan McKay wrote:
> On Tue, Oct 20, 2009 at 6:14 PM, Karanbir Singh  wrote:
>   
>> I have this running in production. only not with 2 machines, but with 4
>> machines, doing raid-10 ( not mdraid10, but conventional 2 sets of
>> raid-1's 0'd )
>> 
>
> Can you give more detail on what you've got there?
> Sounds interesting.
>
>   


...four disk setup like so:

sda+sdb = md0 (raid 1)
sdc + sdb = md1 (raid 1)
md0 + md1 = md2 (raid 0)


A pretty common setup that was possible during installation since RH9 
(not all through anaconda though, older distros needed some manual 
command line intervention using Alt-F2 for a shell)
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Re: [CentOS] Created a DVD from Gnome Desktop -CentOS-5.3

[DTS-Corp (Knowledgebase)]

use power ISO

On Tue, Oct 20, 2009 at 6:13 PM, ken  wrote:

>
> On 10/20/2009 10:44 AM Nicolas Thierry-Mieg wrote:
> > James B. Byrne wrote:
> >> I am trying to put the dvd iso image of CentOS-5.4 onto a DVD.  I
> >> have an LG multi-writer installed.  I have used this device on this
> >> host to created CDs in the past but this is my first attempt at
> >> creating a dvd.
> >>
> >> When I put a blank DVD-R media in the drive then I see a desktop
> >> icon for "CD-ROM Disc" created.  When I open the bittorent folder
> >> and click on the iso image "CentOS-5.4-x86_64-bin-DVD.iso" then I am
> >> prompted to open the image with "CD/DVD Creator".  When I do this
> >> then I get a new window opened with the image file in the lower
> >> portion and an entry at the top labelled:
> >>
> >> CD/DVS Creator Folder and a button labled "Write to Disc"
> >>
> >>
> >> When I click on write to disc I am prompted to either create from
> >> image or create from file.  I select image and am propted for the
> >> speed. I select maximum possible (the default) and press the write
> >> button.  I get this error:
> >>
> >> Insert a rewritable or blank disc
> >>
> >> Please put a disc, with at least 4.3 GiB free, into the drive.  The
> >> following disc types are supported:
> >> DVD+R DL, DVD-RAM, DVD-R, DVD-RW, DVD+R, DVD+RW
> >>
> >> I get the same thing if I use a DVD-RAM.  What is going on?  I have
> >> used the same model dvd writer on a MSWindows stations and have
> >> created readible dvds therefrom.
> >>
> >> Any ideas on how to proceed?
> >>
> >
> > probably not really the solution you were asking for, but you could try
> > with k3b (yum install k3b).
> > I haven't tried it with the C5.4 iso yet but it usually works great for
> me.
>
> I use k3b also and it works pretty good most of the time.  When it
> doesn't, I use cdrecord from the command line.  I've tried the gnome
> burner, but could never figure out how to get it to work.  The UI needs
> more work IMO.
>
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Re: [CentOS] Calling all Hackers from Big stan

[DTS-Corp (Knowledgebase)]

Okay,

Well,  alot of education out there by watching movies, however noone ever
brought up the most complex driven sub-culture of geeks and nerds worldwide.

THE MATRIX (muhahahahah)

But of course, after sending out my request about the whole server /
security thing, someone did manage to break into it very easily.

guess where there is an operating system there is a security risk, waiting
to be exploited.

On Mon, Oct 19, 2009 at 9:36 PM, Chris Boyd  wrote:

> On Mon, 2009-10-19 at 11:19 -0700, ML wrote:
> > > I want to learn to hack what do I need to do in order to start.
> >
> > Umm, watch:
> >
> > Hackers: http://www.imdb.com/title/tt0113243/
> >
> > Takedown: http://www.imdb.com/title/tt0159784/
> >
> > Isn't that how we all learned?
>
> You left off Freedom Downtime:
>
> http://www.imdb.com/title/tt0309614/
>
> --Chris
>
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Re: [CentOS] 5.4 at last?

[mbneto]

Shh... you are going to upset the gods of syncing :)

mount -o loop -t iso9660 isofile /mount-point

Ex. mkdir /tmp/centos54
mount -o loop -t iso9660 isofile /tmp/centos54


On Tue, Oct 20, 2009 at 8:08 PM, fred smith
wrote:

> Now that it appears that some folks are able to get the 5.4 downloads
> (and a GREAT BIG THANK YOU to all the centos team members who make this
> possible!) I'm wondering when the updates will begin flowing so that those
> of us running 5.3 can do "yum upgrade" and enjoy all the benefits too?
>
> Thanks in advance!
>
> --
>  Fred Smith -- fre...@fcshome.stoneham.ma.us-
>  "And he will be called Wonderful Counselor, Mighty God, Everlasting
> Father,
>  Prince of Peace. Of the increase of his government there will be no end.
> He
>  will reign on David's throne and over his kingdom, establishing and
> upholding
>  it with justice and righteousness from that time on and forever."
> --- Isaiah 9:7 (niv)
> --
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Re: [CentOS] 5.4 at last?

[Robert]

fred smith wrote:
> Now that it appears that some folks are able to get the 5.4 downloads
> (and a GREAT BIG THANK YOU to all the centos team members who make this
> possible!) I'm wondering when the updates will begin flowing so that those
> of us running 5.3 can do "yum upgrade" and enjoy all the benefits too?
>
> Thanks in advance!
>   
If you're seriously in a big hurry, get the DVD iso via bittorrent, 
loop-mount the iso someplace and do the update from local media.  Seems 
like there's a wiki page with instructions.


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[CentOS] "conventional cluster management software"

[Alan McKay]

I saw this in the openfiler thread, and realised it is another major
hole in my knowledge

What do you all use for clustering, and does it run out-of-the-box with CentOS?

My main areas of interest are :
- DB clustering (PostgreSQL) - yeah, we're looking at commercial stuff
and skytools
- web server clustering - Apache on CentOS
- storage clustering

thanks,
-Alan

-- 
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Re: [CentOS] openfiler (was: using CentOS as an iSCSI server?)

[Benjamin Franz]

John R Pierce wrote:
> nate wrote:
>   
>> Network RAID – only available from HP
>>   
>> 
>
> Fantasy ideas (eg, I've only thought of this and never tried it). YMMV, 
> caveat emptor, objects in mirror may be closer than they appear, etc etc.
>
> 1) two ISCSI servers, each with identical storage. each offers the same 
> sized iscsi target to the host. the host uses mdraid 1 to mirror these.
>   

I've done it experimentally. It worked.  Obviously you can't share a 
raid volume with multiple client hosts.

> 2) two ISCSI servers, each with identical storage, configured as 
> active-standby cluster, using conventional cluster management software. 
> active 'master' replicates block storage to 'slave' using DRBD.
>
>   

I've done this too (active-active using RH Cluster and GFS). I gave up 
finally because I just couldn't get reliable multipathing. The paths 
would keep locking up in weird ways, fail to come up (randomly), and all 
kinds of hate and discontent. :(

-- 
Benjamin Franz

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Re: [CentOS] full-fledge PDF editor for Linux

[Rob Townley]

On Tue, Oct 20, 2009 at 10:59 AM, Boris Epstein  wrote:
> On Tue, Oct 20, 2009 at 10:36 AM, Boris Epstein  wrote:
>> Hi all,
>>
>> Does anybody know of an editor that can do on Linux what Acrobat /
>> Acrobat Pro can do on Mac/Windows? I have tried to use the PDF Import
>> extension to the Open Office which appears barely functional - at
>> least it is so slow as to be almost impractical. I have also tried
>> pdfedit under Linux which seems to work fine but seems to have rather
>> limited functionality. For instance, the capability to make bookmarks
>> or to search through the whole document (as opposed to the current
>> page) seems to be missing there.
>>
>> Any tips much appreciated.
>>
>> Cheers,
>>
>> Boris.
>>
>
> Hi again,
>
> Just to update you on the situation: the best solution I have found
> thus far is a commercial but cheap one named PDFStudio (
> http://www.qoppa.com/psindex.html ). Prices are under US $100. Seems
> to be doing all we need (much like the Adobe Acrobat Pro ).
>
> Boris.
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Acrobat isn't easy to use either.  i find it kinda clunky and not
intuitive.  Maybe it is the nature of vector graphics and text.

InkScape for graphics imports / exports pdf.
The SVG can be edited in theory in a text editor because it is XML.

ps2pdf  <-->   pdf2ps

xhtml2ps | ps2pdf
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Re: [CentOS] openfiler (was: using CentOS as an iSCSI server?)

[nate]

Alan McKay wrote:
>> Oh so OT but I can't resist!
>
> But I'm running CentOS on top of it everywhere ;-)

yeah that's true, as of my last inventory in August I had
180 CentOS VMs running on vmware in production, another
80 in QA.

nate


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[CentOS] 5.4 at last?

[fred smith]

Now that it appears that some folks are able to get the 5.4 downloads
(and a GREAT BIG THANK YOU to all the centos team members who make this
possible!) I'm wondering when the updates will begin flowing so that those
of us running 5.3 can do "yum upgrade" and enjoy all the benefits too?

Thanks in advance!

-- 
 Fred Smith -- fre...@fcshome.stoneham.ma.us -
  "And he will be called Wonderful Counselor, Mighty God, Everlasting Father,
  Prince of Peace. Of the increase of his government there will be no end. He 
 will reign on David's throne and over his kingdom, establishing and upholding
  it with justice and righteousness from that time on and forever."
--- Isaiah 9:7 (niv) --
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Re: [CentOS] openfiler (was: using CentOS as an iSCSI server?)

[Alan McKay]

> Oh so OT but I can't resist!

But I'm running CentOS on top of it everywhere ;-)



-- 
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Re: [CentOS] openfiler (was: using CentOS as an iSCSI server?)

[nate]

Alan McKay wrote:

> Vmotion is a great selling feature of virtualization to win over nay-sayers
> :-)

Oh so OT but I can't resist!

Also can be a good way to kill off prospects of using vmware if
budgets are tight. When people think vmware most of them
instantly think enterprise version and several thousand $ per
CPU. Sort of like when people think Oracle they instantly think
enterprise edition and $40k+ per cpu.

I've been running vmware since 1999 and have never used vmotion
beyond basic eval stuff.

Currently I've got more than 350 VMs running in production and QA
and none of them can do vMotion. Combination of ESX/ESXi and
version 3.5 and version 4.0. In total about 34 servers, 12 of
which are off site(using local storage mentioned earlier), the
rest use fiber channel to a high end storage array.

>From a blog entry I wrote recently -
http://www.techopsguys.com/2009/08/25/cheap-vsphere-installation-managable-by-vcenter/

> However, once I get a quote I'll probably find out I cannot afford it
> anyway.

See..

The core set of vmware features has gone down in price(not taking
into account ESXi) more than 90% in the past two and a half
years. For me and my 350+ VMs thats a steal.

That said I am pushing to go to a advanced version for next year
with new HP cClass blades and 10GbE. But I sold the company on
vmware with the lower end stuff and have made it perform flawlessly
for the past 14 months or so. Now they see the benefits and want the
higher end stuff for production anyways, and to get production onto
modern systems, currently running on 4+ year old HP DL585G1s.

nate


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Re: [CentOS] openfiler (was: using CentOS as an iSCSI server?)

[Les Mikesell]

Alan McKay wrote:
>> If you don't need vmotion you could just use a small local disk to boot
>> the guest OS and let the guest do the iscsi connections itself for the
>> main part of its storage - in which case the software raid from
>> different targets should work.
> 
> Vmotion is a great selling feature of virtualization to win over nay-sayers 
> :-)
> 
> However, once I get a quote I'll probably find out I cannot afford it anyway.

It does sound like a fun thing to have, but for most of the things where 
you'd want it, you really need a load-balanced farm that can tolerate a 
single machine being down for a while anyway.

-- 
   Les Mikesell
lesmikes...@gmail.com

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Re: [CentOS] Created a DVD from Gnome Desktop -CentOS-5.3

[ken]

On 10/20/2009 10:44 AM Nicolas Thierry-Mieg wrote:
> James B. Byrne wrote:
>> I am trying to put the dvd iso image of CentOS-5.4 onto a DVD.  I
>> have an LG multi-writer installed.  I have used this device on this
>> host to created CDs in the past but this is my first attempt at
>> creating a dvd.
>>
>> When I put a blank DVD-R media in the drive then I see a desktop
>> icon for "CD-ROM Disc" created.  When I open the bittorent folder
>> and click on the iso image "CentOS-5.4-x86_64-bin-DVD.iso" then I am
>> prompted to open the image with "CD/DVD Creator".  When I do this
>> then I get a new window opened with the image file in the lower
>> portion and an entry at the top labelled:
>>
>> CD/DVS Creator Folder and a button labled "Write to Disc"
>>
>>
>> When I click on write to disc I am prompted to either create from
>> image or create from file.  I select image and am propted for the
>> speed. I select maximum possible (the default) and press the write
>> button.  I get this error:
>>
>> Insert a rewritable or blank disc
>>
>> Please put a disc, with at least 4.3 GiB free, into the drive.  The
>> following disc types are supported:
>> DVD+R DL, DVD-RAM, DVD-R, DVD-RW, DVD+R, DVD+RW
>>
>> I get the same thing if I use a DVD-RAM.  What is going on?  I have
>> used the same model dvd writer on a MSWindows stations and have
>> created readible dvds therefrom.
>>
>> Any ideas on how to proceed?
>>
> 
> probably not really the solution you were asking for, but you could try 
> with k3b (yum install k3b).
> I haven't tried it with the C5.4 iso yet but it usually works great for me.

I use k3b also and it works pretty good most of the time.  When it
doesn't, I use cdrecord from the command line.  I've tried the gnome
burner, but could never figure out how to get it to work.  The UI needs
more work IMO.

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Re: [CentOS] openfiler (was: using CentOS as an iSCSI server?)

[Alan McKay]

> If you don't need vmotion you could just use a small local disk to boot
> the guest OS and let the guest do the iscsi connections itself for the
> main part of its storage - in which case the software raid from
> different targets should work.

Vmotion is a great selling feature of virtualization to win over nay-sayers :-)

However, once I get a quote I'll probably find out I cannot afford it anyway.


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Re: [CentOS] openfiler (was: using CentOS as an iSCSI server?)

[Les Mikesell]

Alan McKay wrote:
>> I thought the original object was to make the space available to
>> multiple VMware ESX(i) servers so you could vmotion guests among them.
>> Can ESX construct raids out of multiple iscsi sources?
> 
> Well, my original may have been a bit obtuse because I do not really
> know what I am looking for :-)
> 
> I have a bunch of local disk all over the place.   I eventually want
> to virtualize everything, so I'd like a way to virtualize that
> localdisk and do fancy things with it :-)

If you don't need vmotion you could just use a small local disk to boot 
the guest OS and let the guest do the iscsi connections itself for the 
main part of its storage - in which case the software raid from 
different targets should work.

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Re: [CentOS] openfiler (was: using CentOS as an iSCSI server?)

[Karanbir Singh]

On 10/21/2009 03:55 AM, Les Mikesell wrote:
>> I have this running in production. only not with 2 machines, but with 4
>> machines, doing raid-10 ( not mdraid10, but conventional 2 sets of
>> raid-1's 0'd )
>
> I thought the original object was to make the space available to
> multiple VMware ESX(i) servers so you could vmotion guests among them.
> Can ESX construct raids out of multiple iscsi sources?

I have no idea :) my setup has no vmware or any other form of 
virtualisation in place there. the iscsi blockdev's are exported from 4 
different machines ( each running with an areca-1220 with 8 disks ), 
imported into a single machine - the storage-head, where mdraid does my 
raid10 across those iscsi devices. this new volume is then exported over 
a series of nfs points to various machines on the same subnet.

my point was just that this kind of a distributed setup is possible and 
works well, as long as you can document and monitor the various points well.

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Re: [CentOS] openfiler (was: using CentOS as an iSCSI server?)

[Alan McKay]

> I thought the original object was to make the space available to
> multiple VMware ESX(i) servers so you could vmotion guests among them.
> Can ESX construct raids out of multiple iscsi sources?

Well, my original may have been a bit obtuse because I do not really
know what I am looking for :-)

I have a bunch of local disk all over the place.   I eventually want
to virtualize everything, so I'd like a way to virtualize that
localdisk and do fancy things with it :-)


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Re: [CentOS] openfiler (was: using CentOS as an iSCSI server?)

[Alan McKay]

> Some other divisions in my company seem to like these:
> http://www-03.ibm.com/systems/storage/disk/xiv/
> but they are a little out of my league.

I did not have to read past "high end" to know I cannot afford it.

My entire IT budget is about $50K / year!


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[CentOS] Karanbir's disks (was: openfiler )

[Alan McKay]

On Tue, Oct 20, 2009 at 6:14 PM, Karanbir Singh  wrote:
> I have this running in production. only not with 2 machines, but with 4
> machines, doing raid-10 ( not mdraid10, but conventional 2 sets of
> raid-1's 0'd )

Can you give more detail on what you've got there?
Sounds interesting.

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Re: [CentOS] openfiler (was: using CentOS as an iSCSI server?)

[Les Mikesell]

Karanbir Singh wrote:
> On 10/21/2009 03:34 AM, John R Pierce wrote:
>> 1) two ISCSI servers, each with identical storage. each offers the same
>> sized iscsi target to the host. the host uses mdraid 1 to mirror these.
> 
> I have this running in production. only not with 2 machines, but with 4 
> machines, doing raid-10 ( not mdraid10, but conventional 2 sets of 
> raid-1's 0'd )

I thought the original object was to make the space available to 
multiple VMware ESX(i) servers so you could vmotion guests among them. 
Can ESX construct raids out of multiple iscsi sources?

-- 
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lesmikes...@gmail.com



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Re: [CentOS] openfiler (was: using CentOS as an iSCSI server?)

[Les Mikesell]

Alan McKay wrote:
>> Getting OT but
>>
>> http://www.vmware.com/appliances/directory/92113
>> http://h18006.www1.hp.com/products/storage/software/vsa/index.html
> 
> That's not off topic for me - that's where I started in fact :-)  But
> the HP sales reps evidently do not want to sell the product because
> nobody has gotten back to me yet.   What I was wondering is if
> Openfiler could do the same thing, but it sounds like it cannot.
> 

Some other divisions in my company seem to like these:
http://www-03.ibm.com/systems/storage/disk/xiv/
but they are a little out of my league.

-- 
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lesmikes...@gmail.com

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Re: [CentOS] openfiler (was: using CentOS as an iSCSI server?)

[Karanbir Singh]

On 10/21/2009 03:34 AM, John R Pierce wrote:
> 1) two ISCSI servers, each with identical storage. each offers the same
> sized iscsi target to the host. the host uses mdraid 1 to mirror these.

I have this running in production. only not with 2 machines, but with 4 
machines, doing raid-10 ( not mdraid10, but conventional 2 sets of 
raid-1's 0'd )

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Re: [CentOS] openfiler (was: using CentOS as an iSCSI server?)

[John R Pierce]

nate wrote:
> Network RAID – only available from HP
>   

Fantasy ideas (eg, I've only thought of this and never tried it). YMMV, 
caveat emptor, objects in mirror may be closer than they appear, etc etc.

1) two ISCSI servers, each with identical storage. each offers the same 
sized iscsi target to the host. the host uses mdraid 1 to mirror these.

2) two ISCSI servers, each with identical storage, configured as 
active-standby cluster, using conventional cluster management software. 
active 'master' replicates block storage to 'slave' using DRBD.



with 1) there's questions of how well the mdraid will recover from 
situations where one storage server is offline for some period. I'd feel 
much warmer about this if there was block checksumming and time stamping 
in the raid ala ZFS.

with 2) there's write fencing issues I'd be uncomfortable with, on a 
fenced write, you'd not want to acknowlege operation committed until the 
drbd slave has flushed its buffers.



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Re: [CentOS] openfiler (was: using CentOS as an iSCSI server?)

[Alan McKay]

> Getting OT but
>
> http://www.vmware.com/appliances/directory/92113
> http://h18006.www1.hp.com/products/storage/software/vsa/index.html

That's not off topic for me - that's where I started in fact :-)  But
the HP sales reps evidently do not want to sell the product because
nobody has gotten back to me yet.   What I was wondering is if
Openfiler could do the same thing, but it sounds like it cannot.

>  Network RAID – only available from HP





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Re: [CentOS] openfiler (was: using CentOS as an iSCSI server?)

[nate]

Clint Dilks wrote:

> Dell have recently announced a product that may help a lot with this
> they call it Virtualized ISCSI devices see
> http://www.cns-service.com/equallogic/pdfs/WP910_Virtualized_iSCSI_SANs.pdf

Getting OT but

http://www.vmware.com/appliances/directory/92113
http://h18006.www1.hp.com/products/storage/software/vsa/index.html

Network RAID – only available from HP

* The ultimate in high availability: Traditional hardware RAID and
redundant components are simply not good enough when it comes to your
data. Only HP offers Network RAID which protects you from
outside-the-box issues such as human error, power, cooling and
networking issues.
* Per-volume redundancy: You control which volumes will be protected by
Network RAID.
* Space efficient protection: Network RAID does require additional
capacity. But oh is it worth it! Also, VSA offers other efficiencies
that more than compensate for this extra storage. Thin provisioning is a
great example. Provision volumes at their actual size and allocate
additional storage only as it’s required.



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[CentOS] Console priority

[Daniel Bird]

Hi all,
A while back I vaguely remember someone posting a link to documentation
on how to prioritise console access (for want of a better expression). 
For the life of me I can't find it in the archives or via Google; Can
anyone provide a URL?

Basically, I have a remote server that thrashes (that's my theory at
least) occasionally, resulting in the service (httpd/mysql)  failing.
When its in this state logging on to the console (serial + screen) 
responds with "login timeout". The only way back from this at the moment
is a reboot.. If I can prioritize console access somehow and get on to
the server I may find a clue as to what's causing it.

Cheers
Dan
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Re: [CentOS] openfiler (was: using CentOS as an iSCSI server?)

[Clint Dilks]

John R Pierce wrote:
> absolutely CRITICAL to any SAN implementations is that the storage 
> controller (iscsi target, be it openfiler or what) remain 100% rock 
> solid tsable at all times.
>
> you can NOT REboot a shared storage controller without shutting all 
> client  systems down first (or at least unmounting all SAN volumes)
>
> its non-trivial to implement a high availability  (active/standby) 
> storage controller with iscsi.very hard, in fact. 
>
>   
Dell have recently announced a product that may help a lot with this 
they call it Virtualized ISCSI devices see 
http://www.cns-service.com/equallogic/pdfs/WP910_Virtualized_iSCSI_SANs.pdf

> commercial SANs are fully redundant, with redundant fiberchannel cards 
> on each client and storage controller, redundant fiberchannel switches, 
> redundant paths from the storage controllers to the actual drive arrays, 
> etc.   many of them shadow the writeback cache storage so if one 
> controller fails the other one has any write cached blocks and can post 
> them to the disk spindles transparently to maintain complete data 
> coherency.Trying to achieve this level of 0.9 uptime/reliability 
> with commodity hardware and software is not easy.
>
>
>
>
> ___
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>
>   

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Re: [CentOS] openfiler (was: using CentOS as an iSCSI server?)

[Les Mikesell]

John R Pierce wrote:
> absolutely CRITICAL to any SAN implementations is that the storage 
> controller (iscsi target, be it openfiler or what) remain 100% rock 
> solid tsable at all times.
> 
> you can NOT REboot a shared storage controller without shutting all 
> client  systems down first (or at least unmounting all SAN volumes)
> 
> its non-trivial to implement a high availability  (active/standby) 
> storage controller with iscsi.very hard, in fact. 
> 
> commercial SANs are fully redundant, with redundant fiberchannel cards 
> on each client and storage controller, redundant fiberchannel switches, 
> redundant paths from the storage controllers to the actual drive arrays, 
> etc.   many of them shadow the writeback cache storage so if one 
> controller fails the other one has any write cached blocks and can post 
> them to the disk spindles transparently to maintain complete data 
> coherency.Trying to achieve this level of 0.9 uptime/reliability 
> with commodity hardware and software is not easy.
> 

Has anyone tried doing it with this: http://www.nexenta.com/corp/?

-- 
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Re: [CentOS] openfiler (was: using CentOS as an iSCSI server?)

[John R Pierce]

absolutely CRITICAL to any SAN implementations is that the storage 
controller (iscsi target, be it openfiler or what) remain 100% rock 
solid tsable at all times.

you can NOT REboot a shared storage controller without shutting all 
client  systems down first (or at least unmounting all SAN volumes)

its non-trivial to implement a high availability  (active/standby) 
storage controller with iscsi.very hard, in fact. 

commercial SANs are fully redundant, with redundant fiberchannel cards 
on each client and storage controller, redundant fiberchannel switches, 
redundant paths from the storage controllers to the actual drive arrays, 
etc.   many of them shadow the writeback cache storage so if one 
controller fails the other one has any write cached blocks and can post 
them to the disk spindles transparently to maintain complete data 
coherency.Trying to achieve this level of 0.9 uptime/reliability 
with commodity hardware and software is not easy.




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Re: [CentOS] openfiler (was: using CentOS as an iSCSI server?)

[nate]

Alan McKay wrote:

> This may seem redundant vs just doing it without openfiler, but as
> mentioned a lot of the fancy features you only get with virtualized
> disk.

Doing that for the most part defeats the purpose of using things
like Vmotion in the first place, that is being able to evacuate
a system to perform hardware/software maintenance on it.

Myself I have 12 vSphere ESXi systems deployed at remote sites
using local storage, they run web servers mostly, and are
redundant, so I don't need things like vMotion. Local storage
certainly does restrict flexibility.

Over complicating things is likely to do more harm than good,
and you'll likely regret going down that path at some point so
save your self some trouble and don't try. Get a real storage
system or build a real storage system to do that kind of thing.

Cheap ones include(won't vouch for any of them personally)
http://www.infortrend.com/
http://h18006.www1.hp.com/storage/disk_storage/msa_diskarrays/index.html
http://www.xyratex.com/Products/storage-systems/raid.aspx

Or build/buy a system to run openfiler. At my last company I
had a quad proc system running a few HP MSA shelves that ran
openfiler. Though the software upgrade process for openfiler
was so scary I never upgraded it. And more than one kernel
at the time paniced at boot. I'm sure it's improved since then
(2 years ago).

nate

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Re: [CentOS] EDAC Kernel Panic 2.6.9-78 and above

[Chris Miller]

nate wrote:

> Check your bios/system event log for any indication that it
> is logging memory errors? Most modern server class motherboards
> (past 5 years) do this, though not always reliably.


Nothing in the logs, it's a Supermicro X7DVL-E (fyi).


> I've also had trouble with memtest86 myself, I prefer to run
> ctcs:
> 
> http://sourceforge.net/projects/va-ctcs/


README.FIRST scares me. Server is 70 miles away, not feeling really
good about this. I ran memtest86+ last night for 6+ hours and it
came back clean.


> The software is really old and is picky what you build it on,
> if I recall right I could only get it to build on RHEL/CentOS 4
> not 5 (though the binaries work fine on 5).


I just booted the binary from the memtest site under Grub, it worked
fine.

Regards,
Chris
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[CentOS] openfiler (was: using CentOS as an iSCSI server?)

[Alan McKay]

> Simple, it's only a NAS device, and not really a file server / web
> server / data base server as well.

Here is something I am currently lokoing at, and wondering if you'd
considered it or if anyone here has done it.

I've got a bunch of existing hardware - really good IBM stuff that is
all installed with CentOS (with a few exceptions).  We want to move to
virtualization, but the direct-attached storage is a bit of an issue
because with VMWare ESXi you cannot do some of the fancy stuff like
"VMove" (moving a live running server from one host to another).

So of course Openfiler comes to mine.  However, most of this hardware
has pretty significant CPU and RAM horsepower, so just running it as
openfiler would be quite wasteful.  What I se  some people doing is

- install ESXi (4.0) onto the bare metal
- install openfiler as a virtual machine
- give open filer all the disk
- serve the disk out to other VMs via openfiler

This may seem redundant vs just doing it without openfiler, but as
mentioned a lot of the fancy features you only get with virtualized
disk.

I am about to do some benchmarks on this stuff to see what percentage
of performance I give up for doing it this way.



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Re: [CentOS] unsuscribe

[David Fix]

If you want to unsubscribe, go here: 

http://lists.centos.org/mailman/options/centos 

- Original Message - 
From: "Miguel Varas A."  
To: "CentOS mailing list"  
Sent: Tuesday, October 20, 2009 4:09:08 PM 
Subject: [CentOS] unsuscribe 


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Re: [CentOS] using CentOS as an iSCSI server?

[John R Pierce]

Rudi Ahlers wrote
> Simple, it's only a NAS device, and not really a file server / web
> server / data base server as well. The purposes I needed is to replace
> SMB on the network, and iSCSI seemed like a good alternative. The
> server in question is a dev server, which I thought would be
> beneficial to setup as an iSCSI server as well and connect other
> servers to it's storage, and thus consolidate the storage on it :)
>   



whoa.  ISCSI is *NOT* a NAS/SMB replacement.


ISCSI is a SAN replacement, a low budget (and lower performance) 
alternative to Fibrechannel..   a given iSCSI target volume can only be 
accessed by a single initiator (client) at a time, unless you're running 
some sort of cluster file system that supports shared block devices.


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[CentOS] unsuscribe

[Miguel Varas A.]

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Re: [CentOS] using CentOS as an iSCSI server?

[Rudi Ahlers]

On Tue, Oct 20, 2009 at 6:09 PM, Alan McKay  wrote:
> On Mon, Sep 7, 2009 at 10:57 AM, Rudi Ahlers  wrote:
>> I would like to setup something like Openfiler, but we also need todo
>> some other stuff that OpenFiler doesn't support, so I would prefer to
>> export some of the HDD space (about 500GB) as iSCSI LUN's
>
> Sorry for the thread necromancy here, but can you tell me what was
> missing from Openfiler that you'd like to use?
>
> I'm looking down this path right now and will be sending a few related
> questions to the list.
>
>
> --


Simple, it's only a NAS device, and not really a file server / web
server / data base server as well. The purposes I needed is to replace
SMB on the network, and iSCSI seemed like a good alternative. The
server in question is a dev server, which I thought would be
beneficial to setup as an iSCSI server as well and connect other
servers to it's storage, and thus consolidate the storage on it :)



-- 
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Rudi Ahlers
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Office: 087 805 9573
Cell: 082 554 7532
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Re: [CentOS] using Linux as a NAS / SAN device

[Rudi Ahlers]

On Tue, Oct 20, 2009 at 7:15 PM, Alan McKay  wrote:
>> We have decided to get the Thecus 8800N NAS devices at the end of the
>> day, since they're about 40% cheaper than having to build one. They
>> run a Linux based OS, and uses software RAID, but I can't build a new
>> server at this price, even with software RAID.
>
> Hey Rudi, I'm finding myself tracing your footsteps here as we are
> looking at going down a similar path.
>
> How is that Thecus working out for you?
>
> I googled it and hit this on Tigert Direct
>
> http://www.tigerdirect.com/applications/searchtools/item-details.asp?EdpNo=4831685&csid=ITD&body=MAIN#detailspecs
>
> though it is not clear to me how many drives that comes with - looks
> like only 1 I guess.
>
> thanks,
> -Alan
>
>
> --
> “Don't eat anything you've ever seen advertised on TV”
>         - Michael Pollan, author of "In Defense of Food"
> ___


Hi Alan,

The client who would have used this pulled out on number 99, so I
haven't actually unpacked the NAS and used it We shipped it back
to the suppliers.

But from that I can see on the demo units, it's very easy to use and
works quite well as an off-the-shelf option. Price wise, I couldn't
put together a 2U SuperMicro with 8 drives at the same price. This
device would cost me about 15 - 20% cheaper than building a similar
system with a SuperMicro server + 8 drives, in our country.

Here's the product URL:
http://www.thecus.com/products_over.php?cid=11&pid=177&set_language=english


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Re: [CentOS] Caught between a Red Hat and a CentOS

[Ron Blizzard]

On Tue, Oct 20, 2009 at 6:47 AM, Joseph L. Casale
 wrote:
>>I called them and explained to them that I couldn't get it to boot --
>>they gave me instructions on reinstalling
>
> So Windows is garbage because one support tech is an idiot? There are
> no idiots in the Linux world?

Support techs usually look up problems in the support database. But if
you know of an official Microsoft fix for KSOD, I would be happy to
take a look at it.

>>The KSOD "event" occurred after an automatic Windows update (which
>>isn't all that uncommon I found out).
>
> I have never had a bsod after windows update in 15 years? But then again,
> I test all my updates in a lab environment before my WSUS server pushes
> them out on mass.

Again, I think you're talking about Windows in a server environment
rather than on the Desktop. Two different animals. Google "KSOD" some
time.

>>Okay, what did they tell you about KSOD? Even if I can't fix it, I
>>would at least like to know what really causes it. (There are a lot of
>>theories out there.)
>
> It wasn't a BSOD, it was high IO across a set of spindles with VSS "enabled
> and setup wrong" by my corp. What the entry tech (as it wasn't yet elevated)
> didn't know was specific details about how my fileserver was utilized which
> had an impact in my scenario. A seasoned colleague on the list who *just*
> went through it all gave me the tip.
>
> I guess all Linux techs start out at Datacenter level:)

And, if you're an individual user, that's all the higher you're going
to get. Thing is, if there is a solid fix for KSOD, Microsoft should
publish it on their web site. Again, you're talking about server
issues -- so it's like comparing apples to oranges.

>>Seems to me you're a little bit too sensitive here.
>
> You're right, because that BS was just MS hate, not fact.

I didn't see the hate. I saw reality. I *often* see "reinstall" given
as the final fix for Windows issues. I hope (am pretty sure) that's
not the "fix" they give you on Microsoft servers, but it's definitely
the "fix" you're given on Microsoft desktops.

-- 
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Re: [CentOS] Upgrade to 5.4 with an existing XFS-filesystem

[Akemi Yagi]

On Tue, Oct 20, 2009 at 12:36 PM, Akemi Yagi  wrote:
> On Tue, Oct 20, 2009 at 11:51 AM, Bernhard Gschaider

> The -164 kernel is indeed from 5.4 and has xfs as a built-in kernel
> module.  If you are already running this kernel, that indicates all is
> well and no further action is needed.

In that note, I assumed your kernel was x86_64...

Akemi
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Re: [CentOS] Upgrade to 5.4 with an existing XFS-filesystem

[Akemi Yagi]

On Tue, Oct 20, 2009 at 11:51 AM, Bernhard Gschaider
 wrote:

> I've got a fileserver currently running under 5.3 with the
> /home-partition being an XFS-filesystem. I use the kmod-xfs from
> extras. It works great ;)
>
> Now: as I understand it from the release-notes the 5.4 kernel has XFS
> already built-in. Right? Or is it just a kmod-package ("technology
> preview")
>
> Now my question is: are there any recommendations for an
> upgrade-procedure? I mean, I can probably manage, but I'll want to
> minimize downtime

> BTW: when doing "yum list updates" I don't see any "kernel*"-packages
> in the list. Is this because the last kernel from the 5.3-updates has
> the same build-numer (164 I think)? And is the 5.4-base-kernel the
> same as the latest 5.3-updates-kernel?

The -164 kernel is indeed from 5.4 and has xfs as a built-in kernel
module.  If you are already running this kernel, that indicates all is
well and no further action is needed.

Could you show us the output returned by:

ls -l `find /lib/modules -name xfs.ko`

Akemi
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[CentOS] Upgrade to 5.4 with an existing XFS-filesystem

[Bernhard Gschaider]

Hi!

I've got a fileserver currently running under 5.3 with the
/home-partition being an XFS-filesystem. I use the kmod-xfs from
extras. It works great ;)

Now: as I understand it from the release-notes the 5.4 kernel has XFS
already built-in. Right? Or is it just a kmod-package ("technology
preview") 

Now my question is: are there any recommendations for an
upgrade-procedure? I mean, I can probably manage, but I'll want to
minimize downtime

Bernhard

BTW: when doing "yum list updates" I don't see any "kernel*"-packages
in the list. Is this because the last kernel from the 5.3-updates has
the same build-numer (164 I think)? And is the 5.4-base-kernel the
same as the latest 5.3-updates-kernel?


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Re: [CentOS] iptables question

[Bowie Bailey]

Meenoo Shivdasani wrote:
>> But these aren't SMTP connections.  The source is port 25, but the
>> destination is not.  The mail server is running normally.  I'm allowing
>> new SMTP connections and traffic for established connections.
>> 
>
> They are SMTP connections -- your server initiates a connection to
> port 25 on the remote server.  Thus, when the connection is set up the
> remote server will be responding with source port 25 and destination
> port = source port of the initiated connection.
>   

I understand that.  What I meant was that iptables will not see them as
SMTP connections since the destination is not port 25.

>> ACCEPT all  --  0.0.0.0/00.0.0.0/0   state
>> RELATED,ESTABLISHED
>> ACCEPT tcp  --  0.0.0.0/00.0.0.0/0   state NEW
>> tcp dpt:25
>> 
>
> I think the ACCEPT all line should catch these, but you might try
> adding RELATED,ESTABLISHED specifically to the dpt:25 line.
>   

Which will not match these connections since the dest port is not 25.  I
could put a RELATED, ESTABLISHED line in for source port 25, but as you
said, the "ACCEPT all" line should catch them anyway.

-- 
Bowie
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[CentOS] Openfiler question - fiber channel?

[Alan McKay]

Hey folks,

I don't seem to be able to get a response from the openfiler forums
(and they want 40 quid for the fine manual!), and since there has been
a lot of chat about it here lately, I figured I'd ask here.

Please forgive my terminology as I am just making my first baby steps
into iSCSI and Fiber Channel, and am not very well read on the
matters.   So I could be using the wrong terms (anyone got a good
primer to recommend?)

It seems straightforward that I can install openfiler to server iSCSI
disks out over the network.  And it seems obvious to me that I'd want
a dedicated network for doing that.   That part is easy.

But based on some poking around on the openfiler site and in the
forums, it looks to me like it might be possible to stick a fiber
channel card into an openfiler system, and serve fiberchannel out to
other systems?   Is that right?  Is anyone here doing this?

This does tie back in to CentOS directly because most of my systems
are CentOS, and I'd eventually like to migrate them in this direction,
depending on what comes of my benchmarking

thanks,
-Alan

-- 
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 - Michael Pollan, author of "In Defense of Food"
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Re: [CentOS] iptables question

[Meenoo Shivdasani]

> But these aren't SMTP connections.  The source is port 25, but the
> destination is not.  The mail server is running normally.  I'm allowing
> new SMTP connections and traffic for established connections.

They are SMTP connections -- your server initiates a connection to
port 25 on the remote server.  Thus, when the connection is set up the
remote server will be responding with source port 25 and destination
port = source port of the initiated connection.

> ACCEPT     all  --  0.0.0.0/0            0.0.0.0/0           state
> RELATED,ESTABLISHED
> ACCEPT     tcp  --  0.0.0.0/0            0.0.0.0/0           state NEW
> tcp dpt:25

I think the ACCEPT all line should catch these, but you might try
adding RELATED,ESTABLISHED specifically to the dpt:25 line.

> # cat /proc/sys/net/ipv4/ip_conntrack_max
> 63480

Unless you're passing a lot of traffic, the conntrack_max looks okay.

>
>> Yet another possibility is that these are duplicated packets (for
>> whatever reason) and the connection has already been closed out.
>>
>
> Possible, I guess, but I don't know what would be duplicating them.

This isn't as likely, but the remote sites could be duplicating them
-- the only way to determine if that's the case would be to sniff the
traffic and see if the remote site sends the same packet more than
one.

M
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Re: [CentOS] centos5.4 and freenx - using my home dir and settings

[Ryan Pugatch]

Ryan Pugatch wrote:
> Hello all,
> 
> I am setting up freenx on a machine and I am able to connect to it 
> remotely.  However, when I connect and start xfce it does not appear to 
> use the correct settings.   It acts like it is a whole different user. 
> It is starting the desktop environment as the nx user rather than 
> myself.  Is there any way to have the NX server connect as myself rather 
> than having a whole separate virtual environment?  I know you can't 
> connect to an existing X session that wasn't started with FreeNX, but I 
> want to be able to start a session using my settings and have access to 
> my home dir, etc.
> 
> Thanks,


Nevermind, found the answer at 
http://openfacts2.berlios.de/wikien/index.php/BerliosProject:FreeNX_-_FAQ/Problem_Solving#You_wrongfully_get_logged_in_as_a_user_called_NX

-Ryan
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Re: [CentOS] using Linux as a NAS / SAN device

[Alan McKay]

> We have decided to get the Thecus 8800N NAS devices at the end of the
> day, since they're about 40% cheaper than having to build one. They
> run a Linux based OS, and uses software RAID, but I can't build a new
> server at this price, even with software RAID.

Hey Rudi, I'm finding myself tracing your footsteps here as we are
looking at going down a similar path.

How is that Thecus working out for you?

I googled it and hit this on Tigert Direct

http://www.tigerdirect.com/applications/searchtools/item-details.asp?EdpNo=4831685&csid=ITD&body=MAIN#detailspecs

though it is not clear to me how many drives that comes with - looks
like only 1 I guess.

thanks,
-Alan


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 - Michael Pollan, author of "In Defense of Food"
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Re: [CentOS] VMware Server 2.0.1 and Centos 5.4

[John Thomas]

On 10/20/2009 09:31 AM, Ben Mohilef wrote:
> Upgrade to RHEL 5.4's glibc has rendered vmware-hostd  inoperable in
> some systems. I don't know if Centos 5.4 has the same conflict between
> glibc and VMware Server as RHEL (no reason it shouldn't).
>
> If you run VMware Server 2.0.1 make a copy of /lib64/libc-2.5.so (or
> /lib/libc- 2.5.so) before upgrading to 5.4. If you encounter this
> problem follow dirkgf 's instructions in
> http://communities.vmware.com/thread/229957
>

I will probably go with a temporary solution, which is a slightly 
modified version of the other solution mentioned here:
http://bugs.centos.org/view.php?id=3884

add
exclude=glibc glibc-common glibc-devel glibc-headers nscd
to each repo in CentOS-Base.repo

-- 
Sincerely,
John Thomas
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Re: [CentOS] iptables question

[Bowie Bailey]

Meenoo Shivdasani wrote:
>> conversation.  The question is:  why are all of these remote servers
>> trying to make connections back to me on high-numbered ports?  Should I
>> be allowing these connections somehow?
>> 
>
> The remote server probably thinks that it's still supposed to be
> making connections back to you -- a couple of the lines you posted
> showed FIN flags indicating that the TCP connection was being shut
> down.  At that point, the mail message has already been sent.
>
> If you get REJECT messages for all SMTP connections, look at your
> iptables rules and see if you have a specific rule for smtp that only
> permits NEW conns.
>   

But these aren't SMTP connections.  The source is port 25, but the
destination is not.  The mail server is running normally.  I'm allowing
new SMTP connections and traffic for established connections.

ACCEPT all  --  0.0.0.0/00.0.0.0/0   state
RELATED,ESTABLISHED
ACCEPT tcp  --  0.0.0.0/00.0.0.0/0   state NEW
tcp dpt:25

> One possibility is that iptables no longer thinks that the connection
> is active -- possibly the connection tracking database has already
> pushed that connection out.  You can check your conntrack max value
> with the command
>
> cat /proc/sys/net/ipv4/ip_conntrack_max
>   

# cat /proc/sys/net/ipv4/ip_conntrack_max
63480

> Yet another possibility is that these are duplicated packets (for
> whatever reason) and the connection has already been closed out.
>   

Possible, I guess, but I don't know what would be duplicating them.

-- 
Bowie
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Re: [CentOS] iptables question

[Meenoo Shivdasani]

> conversation.  The question is:  why are all of these remote servers
> trying to make connections back to me on high-numbered ports?  Should I
> be allowing these connections somehow?

The remote server probably thinks that it's still supposed to be
making connections back to you -- a couple of the lines you posted
showed FIN flags indicating that the TCP connection was being shut
down.  At that point, the mail message has already been sent.

If you get REJECT messages for all SMTP connections, look at your
iptables rules and see if you have a specific rule for smtp that only
permits NEW conns.

One possibility is that iptables no longer thinks that the connection
is active -- possibly the connection tracking database has already
pushed that connection out.  You can check your conntrack max value
with the command

cat /proc/sys/net/ipv4/ip_conntrack_max

Yet another possibility is that these are duplicated packets (for
whatever reason) and the connection has already been closed out.

M
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[CentOS] centos5.4 and freenx - using my home dir and settings

[Ryan Pugatch]

Hello all,

I am setting up freenx on a machine and I am able to connect to it 
remotely.  However, when I connect and start xfce it does not appear to 
use the correct settings.   It acts like it is a whole different user. 
It is starting the desktop environment as the nx user rather than 
myself.  Is there any way to have the NX server connect as myself rather 
than having a whole separate virtual environment?  I know you can't 
connect to an existing X session that wasn't started with FreeNX, but I 
want to be able to start a session using my settings and have access to 
my home dir, etc.

Thanks,

Ryan
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[CentOS] VMware Server 2.0.1 and Centos 5.4

[Ben Mohilef]

Upgrade to RHEL 5.4's glibc has rendered vmware-hostd  inoperable in 
some systems. I don't know if Centos 5.4 has the same conflict between 
glibc and VMware Server as RHEL (no reason it shouldn't). 

If you run VMware Server 2.0.1 make a copy of /lib64/libc-2.5.so (or /lib/libc-
2.5.so) before upgrading to 5.4. If you encounter this problem follow dirkgf 's 
instructions in 
   http://communities.vmware.com/thread/229957 

from which I quote:
> 
> Re: vmware-hostd crashes repeatedly after upgrade to RHEL 5.4 Sep 5,
> 2009 7:49 AM
> 
> just for reference in case somebody else is having this issue. We seem to have
> been able to resolve the problem for us. Following the steps we performed.
> 
> * Log on to your VMware host.
> * Create the directory /usr/lib/vmware/lib/libc.so.6
> * Log on to an RHEL 5.3. machine. Grab /lib64/libc-2.5.so (or
>   /lib/libc-2.5.so in case you're running an 32 Bit host) and copy it to 
> the
>   VMware host into /usr/lib/vmware/lib/libc.so.6
> * Rename the file libc-2.5.so within /usr/lib/vmware/lib/libc.so.6 to
> libc.so.6 * Open /usr/sbin/vmware-hostd and add
> /usr/lib/vmware/lib/libc.so.6 to the LD_LIBRARY_PATH. I just added an
> "export LD_LIBRARY_PATH=/usr/lib/vmware/lib/libc.so.6:$LD_LIBRARY_PATH"
> before the last line. * Restart your vmware services (or just the host)
> 
> 
> Downgrading libc might be also an option, but I'd like to keep the host
> unchanged other

Works for me on a x86_64 system which exhibited similar symptoms. I 
agree with his last line because I don't know what else retaining the old glibc 
wold break.

regards,

benm


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Re: [CentOS] Caught between a Red Hat and a CentOS

[Benjamin Franz]

ken wrote:
> Okay, here's one. Maybe someone here can figure it out.
> Upgrading from 4.5 to 4.5.  From a 4.6 ISO I copied all the RPMs into a
> directory... let's call it c:/install :).   Now the oracle dba has
> strict parameters on what versions can be installed and which can't.
> The rpms in c:/install meet those requirements.  In addition, since this
> is a production machine, it can be down at most for one day.  So all I
> want to do is upgrade what's currently on the system.  Moreover, if
> something horks, I want two chances to back out (the second being asking
> the backup guy to put the system back to yesterday).  The command to do
> this would be
>
> rpm --freshen --repackage *
>
> run in that crazy c:/install directory (or what the redhat guy called, a
> "folder").  This command runs fine for one file which has no
> dependencies (i.e., change '*' to a specific rpm).  It also upgrades
> three or four co-dependent rpms if they're narrowly specified.  But if
> the file/rpm spec is '*', rpm complains about two missing dependencies
> and stops.
>
> Yeah, this directory contains 1507 rpms (IIRC)... which is a lot, but it
> should still work.  This is Linux, after all.  And there's plenty enough
> memory and cpu to handle it.
>   

Running

rpm --freshen --repackage * 

for 1500+ rpms  probably exceeds the maximum character length for some 
part of the system after expansion of the '*'  by the shell.

Try breaking it up into smaller chunks (say two or three hundred at a 
time). You can match subsets of the files using shell expansions like

rpm --freshen --repackage [a-g]*

and tweak the line for any dependency complaints manually.

Alternatively, use 'createrepo' to create a Yum repository of the RPMs 
and use yum to handle it for you.

-- 
Benjamin Franz








> [The rh support written response was that there wasn't a problem, that
> this was "expected behavior".  When I phoned the guy and gently pressed
> him on that statement, he backed off of it a little, said, "yeah, it
> should work" but "no one does it that way" and I "really shouldn't
> expect it to work."]
>
> I had a couple other issues with the same command, but I'm not in the
> office now and don't recall them.  Yep, my brain's in time-off mode.
>
> But anyone have any experience or background, enough to say why that rpm
> command above is failing so miserably... and then what might fix it?
>
> If so, big thanks.
>
> ___
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>   


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Re: [CentOS] Monitoring a remote server with Conky ?

[Les Mikesell]

Niki Kovacs wrote:
> Les Mikesell a écrit :
> 
>> If you use X remotely much, just take the whole desktop with freenx on the 
>> server and the NX client that you can download from http://www.nomachine.com.
>>
>> It is very efficient and lets you disconnect/reconnect with everything still 
>> running, even from a different client - or even platform.
>>
> Yeah, I'm a happy user of FreeNX already... although I don't use it for 
> the kind of problem at hand.
> 
> I've been working for a small company recently who run Ubuntu 8.10 on a 
> server, and all their desktops are in fact FreeNX clients connected to 
> that one machine, so folks can work even from their homes. Works great.

You can run multiple NX sessions if you want your 'own' desktop plus one 
for monitoring/managing other systems.  However they are likely to pick 
the same display number and conflict if you are the first connection to 
each freenx server.  You can avoid this problem by changing the 
DISPLAY_BASE setting in /etc/nxserver/node.conf (after copying from 
node.conf.sample).  It's also much nicer for interacting with VMware 
guests than the VMware console tool after the network is configured and 
working.

-- 
   Les Mikesell
 lesmikes...@gmail.com
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Re: [CentOS] iptables question

[Bowie Bailey]

Kai Schaetzl wrote:
> Bowie Bailey wrote on Mon, 19 Oct 2009 17:18:16 -0400:
>
>   
>> The destination address is the private IP of the server.  These
>> seem to be related to outgoing email connections based on the source
>> IPs
>> 
>
> Is 195.140.240.6 the public IP of that machine? Why do you obfuscate a 
> private IP number? Do you want to say that these are internal mail server 
> connections? If not, the explanation about the IP numbers doesn't make 
> sense to me.
>   

No,  195.140... is the IP of the remote machine.  I obfuscated the
private IP of the mail server (and MAC address) on general principles
since they are not relevant to the question.

What I am seeing is a remote server trying to make a connection from
port 25 to a high-numbered port on my mail server.  Iptables rejects the
connection since it is not on an allowed port or part of an established
conversation.  The question is:  why are all of these remote servers
trying to make connections back to me on high-numbered ports?  Should I
be allowing these connections somehow?

For clarity's sake, here are a few non-obfuscated examples:

Oct 20 11:42:27 bnofmail kernel: REJECT: IN=eth0 OUT=
MAC=00:50:8d:59:60:2e:00:90:27:c2:79:77:08:00 SRC=209.27.55.194
DST=172.16.17.169 LEN=107 TOS=0x00 PREC=0x00 TTL=52 ID=56970 DF
PROTO=TCP SPT=25 DPT=40312 WINDOW=62928 RES=0x00 ACK PSH FIN URGP=0
Oct 20 11:42:49 bnofmail kernel: REJECT: IN=eth0 OUT=
MAC=00:50:8d:59:60:2e:00:90:27:c2:79:77:08:00 SRC=203.17.219.68
DST=172.16.17.169 LEN=52 TOS=0x00 PREC=0x00 TTL=117 ID=19851 DF
PROTO=TCP SPT=25 DPT=40289 WINDOW=64167 RES=0x00 ACK FIN URGP=0
Oct 20 11:43:01 bnofmail kernel: REJECT: IN=eth0 OUT=
MAC=00:50:8d:59:60:2e:00:90:27:c2:79:77:08:00 SRC=204.127.217.16
DST=172.16.17.169 LEN=72 TOS=0x00 PREC=0x20 TTL=50 ID=15125 DF PROTO=TCP
SPT=25 DPT=40346 WINDOW=64296 RES=0x00 ACK URGP=0

172.16.17.169 is the private IP of one of my mailservers.  The other IPs
are remote servers not under my control.  About 20% of them are servers
that have received outbound email from my server recently.  I have no
idea where the others come from. 

I have gotten over 83,000 of these connection attempts so far today from
267 unique IP addresses.

-- 
Bowie
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Re: [CentOS] using CentOS as an iSCSI server?

[Alan McKay]

On Mon, Sep 7, 2009 at 10:57 AM, Rudi Ahlers  wrote:
> I would like to setup something like Openfiler, but we also need todo
> some other stuff that OpenFiler doesn't support, so I would prefer to
> export some of the HDD space (about 500GB) as iSCSI LUN's

Sorry for the thread necromancy here, but can you tell me what was
missing from Openfiler that you'd like to use?

I'm looking down this path right now and will be sending a few related
questions to the list.


-- 
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 - Michael Pollan, author of "In Defense of Food"
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Re: [CentOS] full-fledge PDF editor for Linux

[Boris Epstein]

On Tue, Oct 20, 2009 at 10:36 AM, Boris Epstein  wrote:
> Hi all,
>
> Does anybody know of an editor that can do on Linux what Acrobat /
> Acrobat Pro can do on Mac/Windows? I have tried to use the PDF Import
> extension to the Open Office which appears barely functional - at
> least it is so slow as to be almost impractical. I have also tried
> pdfedit under Linux which seems to work fine but seems to have rather
> limited functionality. For instance, the capability to make bookmarks
> or to search through the whole document (as opposed to the current
> page) seems to be missing there.
>
> Any tips much appreciated.
>
> Cheers,
>
> Boris.
>

Hi again,

Just to update you on the situation: the best solution I have found
thus far is a commercial but cheap one named PDFStudio (
http://www.qoppa.com/psindex.html ). Prices are under US $100. Seems
to be doing all we need (much like the Adobe Acrobat Pro ).

Boris.
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Re: [CentOS] full-fledge PDF editor for Linux

[Patrick McEvoy]

Not sure what you are looking to do but have a look at pdfedit.  You can 
get it from the rpmforge repo.

Joseph L. Casale wrote:
>> Does anybody know of an editor that can do on Linux what Acrobat /
>> Acrobat Pro can do on Mac/Windows?
>> 
>
> Ughh, I am in this mess right now myself.
>
>   
>> I have tried to use the PDF Import
>> extension to the Open Office which appears barely functional - at
>> least it is so slow as to be almost impractical. I have also tried
>> pdfedit under Linux which seems to work fine but seems to have rather
>> limited functionality. For instance, the capability to make bookmarks
>> or to search through the whole document (as opposed to the current
>> page) seems to be missing there.
>> 
>
> Yeah, I can't stand the interface on that one. Scribus and another one
> on Fedora at least (Not on that wkst atm) never measured up.
>
>   
>> Any tips much appreciated.
>> 
>
> For my needs, I ended up using an online tool, funny that is.
> http://www.pdfescape.com/
>
> If you come across anything good, mention it back here,
> jlc
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>   

-- 

Patrick McEvoy
System Administrator
Silva Capital Management, LLC
625 N. Michigan Ave, Suite 412
Chicago, IL 60611
Office: 312-397-0400, Fax: 312-397-0404
Cell: 773-517-1287
pmce...@silvacapitalmgmt.com


  Silva Capital Management, LLC 

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Re: [CentOS] Monitoring a remote server with Conky ?

[Niki Kovacs]

Les Mikesell a écrit :

> 
> If you use X remotely much, just take the whole desktop with freenx on the 
> server and the NX client that you can download from http://www.nomachine.com.
> 
> It is very efficient and lets you disconnect/reconnect with everything still 
> running, even from a different client - or even platform.
> 
Yeah, I'm a happy user of FreeNX already... although I don't use it for 
the kind of problem at hand.

I've been working for a small company recently who run Ubuntu 8.10 on a 
server, and all their desktops are in fact FreeNX clients connected to 
that one machine, so folks can work even from their homes. Works great.

Niki
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Re: [CentOS] Monitoring a remote server with Conky ?

[Les Mikesell]

Andrew Hull wrote:
>
> 
> I do exactly what you suggest. I keep a minimal X install on most of my 
> headless machines -- I still boot run level 3. This lets me "ssh -X" to 
> a machine and execute graphical commands, and up the come on my local 
> Linux workstation.
> 
> Occasionally, this is very useful for me. For instance: I have some of 
> these headless boxen scattered throughout the network. With this, I can 
> launch firefox on a remote machine. This lets me test viewing resources 
> from various points of the network; great for security policy testing.
> 
> What you're talking about works great too. I have gkrellm installed on 
> these machines too, as well as the servers. Cacti is great for looking 
> at trending or historical data. But to see what a server is up to _right 
> now_ I fire up gkrellm this way (along with things like "tail 'cat 
> /var/log/_something_'" and htop) to see what the machine is up to right 
> then and there.
> 
> gkrellm is available from the wonderful rpmforge repo, but I'm sure 
> Conky would work too.

You can take this one step further by picking an always-on host where 
you run freenx.  Then connect with the NX client from www.nomachine.com 
and start a desktop where you can park long running jobs like monitoring 
tools (including remote X connections or a bunch of xterms with ssh 
connections elsewhere).  Then you can disconnect the NX client and 
reconnect later with everything still running.  The connection can be 
from any linux/windows/mac NX client and you get very good remote 
performance even over low bandwidth connections - and unlike normal X 
connections, losing the connection doesn't kill the processes.

-- 
   Les Mikesell
 lesmikes...@gmail.com



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Re: [CentOS] full-fledge PDF editor for Linux

[Joseph L. Casale]

>Does anybody know of an editor that can do on Linux what Acrobat /
>Acrobat Pro can do on Mac/Windows?

Ughh, I am in this mess right now myself.

>I have tried to use the PDF Import
>extension to the Open Office which appears barely functional - at
>least it is so slow as to be almost impractical. I have also tried
>pdfedit under Linux which seems to work fine but seems to have rather
>limited functionality. For instance, the capability to make bookmarks
>or to search through the whole document (as opposed to the current
>page) seems to be missing there.

Yeah, I can't stand the interface on that one. Scribus and another one
on Fedora at least (Not on that wkst atm) never measured up.

>Any tips much appreciated.

For my needs, I ended up using an online tool, funny that is.
http://www.pdfescape.com/

If you come across anything good, mention it back here,
jlc
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Re: [CentOS] Don't have scaling_available_frequencies files

[Neil Aggarwal]

> > I took a look at my system (CentOS 5.4) and there are no
> > cpufreq directories in the cpu folders.
> 
> I think that's probably because the associated driver is
> not loaded.

I did some reading on the cpufreq and actually think it
is better that it is not enabled.

Thanks,
Neil

--
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Re: [CentOS] Created a DVD from Gnome Desktop -CentOS-5.3

[Robert Heller]

At Tue, 20 Oct 2009 10:32:40 -0400 (EDT) CentOS mailing list 
 wrote:

> 
> I am trying to put the dvd iso image of CentOS-5.4 onto a DVD.  I
> have an LG multi-writer installed.  I have used this device on this
> host to created CDs in the past but this is my first attempt at
> creating a dvd.
> 
> When I put a blank DVD-R media in the drive then I see a desktop
> icon for "CD-ROM Disc" created.  When I open the bittorent folder

This means that the DVD-R you inserted has something on it already. A
truely blank DVD-R won't give you an icon since there is no file system
that can be mounted.

> and click on the iso image "CentOS-5.4-x86_64-bin-DVD.iso" then I am
> prompted to open the image with "CD/DVD Creator".  When I do this
> then I get a new window opened with the image file in the lower
> portion and an entry at the top labelled:
> 
> CD/DVS Creator Folder and a button labled "Write to Disc"
> 
> 
> When I click on write to disc I am prompted to either create from
> image or create from file.  I select image and am propted for the
> speed. I select maximum possible (the default) and press the write
> button.  I get this error:
> 
> Insert a rewritable or blank disc
> 
> Please put a disc, with at least 4.3 GiB free, into the drive.  The
> following disc types are supported:
> DVD+R DL, DVD-RAM, DVD-R, DVD-RW, DVD+R, DVD+RW
> 
> I get the same thing if I use a DVD-RAM.  What is going on?  I have
> used the same model dvd writer on a MSWindows stations and have
> created readible dvds therefrom.
> 
> Any ideas on how to proceed?

I'd just use cdrecord from the command line, but that is just me.

> 
> 

-- 
Robert Heller -- 978-544-6933
Deepwoods Software-- Download the Model Railroad System
http://www.deepsoft.com/  -- Binaries for Linux and MS-Windows
hel...@deepsoft.com   -- http://www.deepsoft.com/ModelRailroadSystem/

  
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Re: [CentOS] Don't have scaling_available_frequencies files

[nate]

Neil Aggarwal wrote:

> I took a look at my system (CentOS 5.4) and there are no
> cpufreq directories in the cpu folders.

I think that's probably because the associated driver is
not loaded.

nate


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Re: [CentOS] Created a DVD from Gnome Desktop -CentOS-5.3

[Nicolas Thierry-Mieg]

James B. Byrne wrote:
> I am trying to put the dvd iso image of CentOS-5.4 onto a DVD.  I
> have an LG multi-writer installed.  I have used this device on this
> host to created CDs in the past but this is my first attempt at
> creating a dvd.
> 
> When I put a blank DVD-R media in the drive then I see a desktop
> icon for "CD-ROM Disc" created.  When I open the bittorent folder
> and click on the iso image "CentOS-5.4-x86_64-bin-DVD.iso" then I am
> prompted to open the image with "CD/DVD Creator".  When I do this
> then I get a new window opened with the image file in the lower
> portion and an entry at the top labelled:
> 
> CD/DVS Creator Folder and a button labled "Write to Disc"
> 
> 
> When I click on write to disc I am prompted to either create from
> image or create from file.  I select image and am propted for the
> speed. I select maximum possible (the default) and press the write
> button.  I get this error:
> 
> Insert a rewritable or blank disc
> 
> Please put a disc, with at least 4.3 GiB free, into the drive.  The
> following disc types are supported:
> DVD+R DL, DVD-RAM, DVD-R, DVD-RW, DVD+R, DVD+RW
> 
> I get the same thing if I use a DVD-RAM.  What is going on?  I have
> used the same model dvd writer on a MSWindows stations and have
> created readible dvds therefrom.
> 
> Any ideas on how to proceed?
> 

probably not really the solution you were asking for, but you could try 
with k3b (yum install k3b).
I haven't tried it with the C5.4 iso yet but it usually works great for me.
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[CentOS] Don't have scaling_available_frequencies files

[Neil Aggarwal]

Hello all:

I am trying to follow the RHEL virtualization guide.
According to Chapter 17, I have a processor without
a constant Time Stamp Counter (Its an Opteron).

According to that guide, I need to set the MIN_SPEED and 
MAX_SPEED variables in /etc/sysconfig/cpuspeed to the
highest frequency show in
/sys/devices/system/cpu/cpu*/cpufreq/scaling_available_frequencies

I took a look at my system (CentOS 5.4) and there are no
cpufreq directories in the cpu folders.

Is that a problem?

Thanks,
Neil

--
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Will your e-commerce site go offline if you have
a DB server failure, fiber cut, flood, fire, or other disaster?
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[CentOS] full-fledge PDF editor for Linux

[Boris Epstein]

Hi all,

Does anybody know of an editor that can do on Linux what Acrobat /
Acrobat Pro can do on Mac/Windows? I have tried to use the PDF Import
extension to the Open Office which appears barely functional - at
least it is so slow as to be almost impractical. I have also tried
pdfedit under Linux which seems to work fine but seems to have rather
limited functionality. For instance, the capability to make bookmarks
or to search through the whole document (as opposed to the current
page) seems to be missing there.

Any tips much appreciated.

Cheers,

Boris.
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[CentOS] Created a DVD from Gnome Desktop -CentOS-5.3

[James B. Byrne]

I am trying to put the dvd iso image of CentOS-5.4 onto a DVD.  I
have an LG multi-writer installed.  I have used this device on this
host to created CDs in the past but this is my first attempt at
creating a dvd.

When I put a blank DVD-R media in the drive then I see a desktop
icon for "CD-ROM Disc" created.  When I open the bittorent folder
and click on the iso image "CentOS-5.4-x86_64-bin-DVD.iso" then I am
prompted to open the image with "CD/DVD Creator".  When I do this
then I get a new window opened with the image file in the lower
portion and an entry at the top labelled:

CD/DVS Creator Folder and a button labled "Write to Disc"


When I click on write to disc I am prompted to either create from
image or create from file.  I select image and am propted for the
speed. I select maximum possible (the default) and press the write
button.  I get this error:

Insert a rewritable or blank disc

Please put a disc, with at least 4.3 GiB free, into the drive.  The
following disc types are supported:
DVD+R DL, DVD-RAM, DVD-R, DVD-RW, DVD+R, DVD+RW

I get the same thing if I use a DVD-RAM.  What is going on?  I have
used the same model dvd writer on a MSWindows stations and have
created readible dvds therefrom.

Any ideas on how to proceed?


-- 
***  E-Mail is NOT a SECURE channel  ***
James B. Byrnemailto:byrn...@harte-lyne.ca
Harte & Lyne Limited  http://www.harte-lyne.ca
9 Brockley Drive  vox: +1 905 561 1241
Hamilton, Ontario fax: +1 905 561 0757
Canada  L8E 3C3

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Re: [CentOS] Caught between a Red Hat and a CentOS

[Joseph L. Casale]

>I wonder what those opinions are.

That would just start a useless flame..

>One of the main reasons *I* am no fan
>of MS is their clear subversion of standards for their own ends.

Well, they do some stupid things. No Linux vendor ever did?[1]

>Exchange, e.g., has a *horrible* IMAP implementation which they have point
>blank admitted they have no intentions of fixing.

And I hope they don't:) It's a sh!t protocol, OL is by far the best
client I have used. I am actually rdp'ing into a windows wkst to use ol
from my linux desktop as I have yet to find a client as feature-full
*and* stable is outlook. The Outlook anywhere with rpc/http, activesync
and OWA is a corporate dream to work with imho.

>And then there was the whole ODF fiasco.

Yup, a spade is a spade, that was useless as mams on a bull. See [1] :)

>I hear they make good mice though...

Heh, they're ok...
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Re: [CentOS] Monitoring a remote server with Conky ?

[Andrew Hull]

Niki Kovacs wrote:
> Hi,
> 
> I've been using Conky for some time, a nifty utility to monitor just 
> about anything on the PC. Vital things like CPU, RAM, swap, disks, 
> current song playing in MPD :o)
> 
> Here's what it looks like :
> 
> http://www.microlinux.fr/images/bureau_conky.png
> 
> And with more detail :
> 
> http://www.microlinux.fr/images/conky_zoom.png
> 
> Now I wonder... I'd really like to use that to monitor my remote server. 
> I know this feature isn't officially supported by Conky, but I'm right 
> now thinking about a workaround. Something like: OK, my server is 
> 'headless' (e. g.: no graphical server, nothing), but why not install 
> just xorg-x11-server-Xorg, then use Conky and forward it to my local 
> display with SSH -X ? I'm pondering this question, thinking about the 
> possible issues...
> 
> ... so maybe one of you guys here has come up with some solution ?
> 
> Cheers,
> 
> Niki
> ___
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Hi,
The suggestions offered by other posters to install/use a 
monitoring/polling/graphing system is a fine idea. Using something like 
Cacti is great for collecting and viewing historical data.

However for looking at what a server is doing _right now_, that kind of 
system falls short. I think your original idea is spot on!

I do exactly what you suggest. I keep a minimal X install on most of my 
headless machines -- I still boot run level 3. This lets me "ssh -X" to 
a machine and execute graphical commands, and up the come on my local 
Linux workstation.

Occasionally, this is very useful for me. For instance: I have some of 
these headless boxen scattered throughout the network. With this, I can 
launch firefox on a remote machine. This lets me test viewing resources 
from various points of the network; great for security policy testing.

What you're talking about works great too. I have gkrellm installed on 
these machines too, as well as the servers. Cacti is great for looking 
at trending or historical data. But to see what a server is up to _right 
now_ I fire up gkrellm this way (along with things like "tail 'cat 
/var/log/_something_'" and htop) to see what the machine is up to right 
then and there.

gkrellm is available from the wonderful rpmforge repo, but I'm sure 
Conky would work too.

Andy Hull


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[CentOS] update of openssh-server i386 4.3p2-36.el5, dependencies

[zagiatakrapovic]

more rant on

@ChrisG: maybe you should check your ironyEnabled flag is set to TRUE
and the personalSensitivity enum is not WALLFLOWER but SELFCONFIDENT

thx for your advises and lessons, the best lesson for me now was to see that 
trying to refresh a stalled thread by using kind of humor isn't accepted in 
this part of the world. next time I will just try "PING", that's less human 
like but maybe less people get offended...


more rant off
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Re: [CentOS] Caught between a Red Hat and a CentOS

[Joshua Baker-LePain]

On Tue, 20 Oct 2009 at 11:47am, Joseph L. Casale wrote



> This useless thread will never end, FOSS guys have their sh!t in a knot 
> over MS for reason of which I have my own opinions.

I wonder what those opinions are.  One of the main reasons *I* am no fan 
of MS is their clear subversion of standards for their own ends. 
Exchange, e.g., has a *horrible* IMAP implementation which they have point 
blank admitted they have no intentions of fixing.  They, of course, want 
you to use their proprietary mail client.  And then there was the whole 
ODF fiasco.

I hear they make good mice though...

-- 
Joshua Baker-LePain
QB3 Shared Cluster Sysadmin
UCSF
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Re: [CentOS] Caught between a Red Hat and a CentOS

[Joseph L. Casale]

>I called them and explained to them that I couldn't get it to boot --
>they gave me instructions on reinstalling

So Windows is garbage because one support tech is an idiot? There are
no idiots in the Linux world?

>The KSOD "event" occurred after an automatic Windows update (which
>isn't all that uncommon I found out).

I have never had a bsod after windows update in 15 years? But then again,
I test all my updates in a lab environment before my WSUS server pushes
them out on mass.

>Okay, what did they tell you about KSOD? Even if I can't fix it, I
>would at least like to know what really causes it. (There are a lot of
>theories out there.)

It wasn't a BSOD, it was high IO across a set of spindles with VSS "enabled
and setup wrong" by my corp. What the entry tech (as it wasn't yet elevated)
didn't know was specific details about how my fileserver was utilized which
had an impact in my scenario. A seasoned colleague on the list who *just*
went through it all gave me the tip.

I guess all Linux techs start out at Datacenter level:)

>Seems to me you're a little bit too sensitive here.

You're right, because that BS was just MS hate, not fact.
jlc
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Re: [CentOS] Caught between a Red Hat and a CentOS

[Joseph L. Casale]

>Remember that windows integration website ( don't remember the name
>but related to nLite and ryanvm) shutdown by Microsoft - it made a
>great deal of news because they had scripts to take out annoyances
>such as balloons popping up in the taskbar.  MS lawyers had them
>disbanded

For a good reason, because silly non-admins where using nlite in a corporate
environment? WTF, if you take all of RHELS rpms and recompile them in an
unsupported manor then call for help, what do you think they will do?

You have got to be kidding me, ms should just support anything anyone wants
to do? Sigh...

>It takes way too much time to install a windows system from scratch, configure
>how you want it,  and then install all the apps on top and then all the updates
>and then all the updates to the apps ad nauseam. Oh, you want to image that
>harddrive now?  Well you get 3 attempts with sysprep and then you start all
>over - no thanks..

Well, if you need some guidance on how to do this, I would be willing to help.
Even at home I use RIS/WDS and deploy almost all of my apps to windows lab vm's
with GPO's. So, unfortunately yes, I do *completely* automated deployments that
setup all my apps and even pre-populate some settings at the push of F12. When
I didn't have this knowledge, I never assumed Bill was an a$$hole, I took the
time to learn it. Same with Linux, when I never had kickstart knowledge and
couldn't automate my CentOS deployments, I never assumed KB or the CentOS devs
were scumbags, I took the time to learn it:)

Guess what, now I can do both! Wow...

This useless thread will never end, FOSS guys have their sh!t in a knot over
MS for reason of which I have my own opinions. Bottom line is, I work with both
and quit successfully get equivalent uptimes and QOS with both. Many guys do it,
it's possible. I met one of the guys who did the barnes and noble setup at an 
msdn
conference, I guess that successful setup wasn't the result of competent guys
who actually knew their sh!t and did a good job, but just dumb luck. Mama always
said if I could be smart or lucky, it was better to be lucky:)

jlc

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Re: [CentOS] sum and limit quota for multiple filesystems/mountpoints

[Peter Kjellstrom]

On Tuesday 20 October 2009, Götz Reinicke - IT-Koordinator wrote:
> Hi,
>
> is there any way to sum and limit quotas for one user across multiple
> filesystems?
>
> E.g. I'd like to use different mountpoints on a mailserver for /var/mail
> and /home but the user should have only a total of 1GB.

There is no such functionality in quota. What you could do is to update the 
2nd filesystems quota setting, on a regular basis, to something like TOTAL 
minus currently used on the 1st fs.

This surely qualifies as a "duct tape solution".

/Peter

> or on a samba server the windows profile files should be on an other
> filesystem as other files for that user.
>
>
> Regards,
>
>   Götz


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Re: [CentOS] Caught between a Red Hat and a CentOS

[Ron Blizzard]

On Mon, Oct 19, 2009 at 3:45 PM, Joseph L. Casale
 wrote:
>>which is about as useful as Microsoft Windows support... is it broken?
>>"reinstall windows"
>
> FFS, this attitude amongst opensource guys that MS is the devil and are
> trying to murder your family or  sabotage your life is such BS.

I don't know what Microsoft's support is like for servers, but on the
desktop they *definitely* tell you to reinstall for almost any major
problem. I don't work on computers for a living anymore, but my wife
is always telling people that I can help them when their Windows
computers go down. An older lady at our church had a Vista machine go
KSOD (black screen of death on her). It was a fairly new Dell. I
called them and explained to them that I couldn't get it to boot --
they gave me instructions on reinstalling. Microsoft's support
suggestion was to reinstall. I found out later why, there must have
been 10 different ways to fix KSOD (that worked for some people but
not others) and I tried every one. Finally using MSCONFIG I was able
to open a "hive" (I've purposely avoided Vista so this is all new to
me) and backed up the user directories to a portable hard drive. And
then I did what I almost always have to do with Windows... reinstalled
it. The KSOD "event" occurred after an automatic Windows update (which
isn't all that uncommon I found out).

> Take the Tin Foil Hat off and settle down, MS support is easily on par w/
> or *the* best support there is.

Again, telling you to "reinstall" is not good support, in my opinion.

> I maintain both Linux/Unix and Windows machines, and since high school days
> I have been using PSS and there is nothing like it. They have have *ALWAYS*
> fixed everything but one issue I have had, where that one issue I resolved
> before them.

Okay, what did they tell you about KSOD? Even if I can't fix it, I
would at least like to know what really causes it. (There are a lot of
theories out there.)

> Spreading your FUD reflects on _you_ not MS.

All he said is that they tell you to "reinstall" which is what they
do. It's not FUD.

> I love Linux (and prefer to toil in this forest) but don't preach that anti-ms
> crap, its utter malarkey.

Seems to me you're a little bit too sensitive here. I've reinstalled
Windows on many personal computers for friends and family, and have
seen many Windows computers "re-imaged" in the corporate environment.
"Reboot" and/or "reinstall" are two of the most common "fixes" for
Windows. This is not "tin-hat" malarkey, it's the simple truth -- and
it's one of the big reasons I moved to Linux.

-- 
RonB -- Using CentOS 5.3
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Re: [CentOS] RAID advice? and KVM advice?

[Christopher Chan]

RedShift wrote:
> Dave Stevens wrote:
>   
>> Hello All,
>>
>> In the not too distant future I will be commissioning a new CentOS  
>> (5.4?) box with 4 identical SATA drives. I'd like to set them up as  
>> RAID 1+0 for speed and redundancy. I've read the RHEL 5 deployment  
>> guide on raid setup and it seems to cover the basics of software raid  
>> pretty well, but doesn't cover 1+0. Does anyone have a reference for  
>> that kind of configuration?
>>
>> 
>
> Hello
>
>
> The current anaconda doesn't allow you to select RAID10, however, RAID10 does 
> work if you configure such an array manually.
>
>
>   

raid1+0. Not raid10. That is a module implementing a non-standard raid 
that Neil Brown calls raid10 and this md module is not included in the 
installation initrd although it is available afterwards I think.
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