Re: [CentOS] persistent custom lines in /etc/hosts?

[wwp]

Hello R,


On Sun, 11 Sep 2011 17:15:02 -0700 "R - elists"  wrote:

>  
> > 
> > I've edited /etc/hosts to add few custom IP/hostnames couples.
> > After each reboot, I have to add them again. I've then added 
> > /etc/sysconfig/network/hosts, but it seems to ignore it or at 
> > least ignore 127.0.0.1 assignments I'm doing in it.
> > 
> > Is there a mechanism I'm not aware of, or doing things wrong 
> > to make my custom IP/hostnames assignments permanent after 
> > network services restart?
> snip
> > wwp
> 
> you didnt tell us much about your centos version etc so
> 
> is your networking set up statically, or is it dhcp dynamic.
> 
> if the latter, then "possibly" that is part of the issue
> 
> ive always noticed that files like /etc/resolv.conf and others can change in
> a generic dhcp environment
> 
> ...one reason we setup almost everything statically

You're right, I'm sorry about this. It's CentOS6, DHCP setup.

When /etc/hosts is rewritten, it keeps the lines that describe remote
hosts (other but 127.0.0.1), but remove my custom assignments to
127.0.0.1, this is the point I'd like to solve. I have to say that the
aliases to 127.0.0.1 are defined on several lines (127.0.0.1 foo
bar\n127.0.0.1 a b c\n).

I've put in /etc/sysconfig/networking/profiles/default/ a hosts file
with my custom lines in, but this apparently isn't enough.


Regards,

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Re: [CentOS] Approximate size of CentOS mirror

[James A. Peltier]

Current full mirror size is 122G

- Original Message -
| Hey all,
| 
| Roughly, how much disk space would I need on my server to mirror the
| entire ISO collection and the repository files. Also, how would I tell
| my server to only mirror CentOS 5 and 6?
| 
| --
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| 478 241 896.
| 
| Regards,
| Christopher Hawker
| 
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[CentOS] Approximate size of CentOS mirror

[Christopher Hawker]

Hey all,

Roughly, how much disk space would I need on my server to mirror the entire ISO 
collection and the repository files. Also, how would I tell my server to only 
mirror CentOS 5 and 6?

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896.

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Re: [CentOS] TIP for broken ARIN whois

[Bart Schaefer]

On Sun, Sep 11, 2011 at 7:31 PM, Always Learning  wrote:
>
>> >     #!/bin/bash
>> >     whois -h whois.arin.net n + $1
>
>> Any particular reason you used a bash script as opposed to an alias in
>> your bash config?
>
> My understanding of aliases is I can not include additional parameters

With bash / ksh / zsh aliases you can't rearrange the parameters, but
you can always add them to the end.  E.g. this:

 alias .arin='whois -h whois.arin.net n +'

can be called as

 .arin 64.64.64.64

and will expand the way you want.  However, if you needed to have
something come after 64.64.64.64, or to be mixed in with the whois
options, you'd have to use a script or a shell function.  I.e., if you
wanted to pass the name of the whois server rather than hardcode it:

  .arin() { whois -h $1 n + $2; }

That can't be done with an alias (except in csh).
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Re: [CentOS] Vitualization and Partitioning

[ken]

On 09/11/2011 11:10 PM Emmanuel Noobadmin wrote:
> Hi,
> 
>> When I do the install, do I or should I setup a separate partition for guest
> That would be better from a performance point of view
> 
>> OS's? From the redhat docs, it looks like the guest OS's reside at
>> /var/lib/libvirt/images/.
> This should be using files as disk files, which I did and found it to
> be a problem when there is heavy I/O.

I like LVM (for the reasons you cite).  Would you (anyone?) say it's 
best to have one LV per guest or one LV for all guests?


tnx.

> 

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Re: [CentOS] Vitualization and Partitioning

[Emmanuel Noobadmin]

Hi,

> When I do the install, do I or should I setup a separate partition for guest
That would be better from a performance point of view

> OS's? From the redhat docs, it looks like the guest OS's reside at
> /var/lib/libvirt/images/.
This should be using files as disk files, which I did and found it to
be a problem when there is heavy I/O.

>I may combine my windoze XP on the CentOS machine
> so would I need to create a partition and format that at installation? If I
> decide to wait and go with Windoze 7 can I still create the partition later?
>
> I would like a partition scheme that allows for easier upgrades or installs
> without losing data.

Try using LVM then, it allows you to create and resize logical
partitions, including expanding with additional hard disks in the
future without having to reconfigure your VM guest (except the usual
file system expansion steps)

> Thanks, I'm more confused now that when I started reading about this stuf..

That's my experience too, the more we read, the more
alternatives/options there are, the more confusing it gets! :D
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Re: [CentOS] No MySQL password in ps aux!

[Devin Reade]

Getting back to the original question, it is a feature of mysql (not
of CentOS per se), but there's nothing that stops other (C) programs
from doing something similar.  Shortly after startup, a programmer can
set things up so that command line arguments (or in this case one of
them) is hidden from anyone from viewing the process table.

However, even using this mechanism there is a window where, if someone
looks at the process table at the right time, they will see the password
in cleartext.

So, despite the mysql programmers trying to minimize the chance of 
leaking the password it is still a risk and so the advice others have
given about -p (without the password) and .my.cnf is still the best
option.

Devin
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Re: [CentOS] TIP for broken ARIN whois

[Always Learning]

On Mon, 2011-09-12 at 10:55 +1000, Steve Walsh wrote:

> I wrote:-
> > A one line script solves it for me (but only for ARIN network entries).
> >
> > #!/bin/bash
> > whois -h whois.arin.net n + $1

> Any particular reason you used a bash script as opposed to an alias in 
> your bash config?

My understanding of aliases is I can not include additional parameters
although I know virtually little about them. I do use links like these

sv = service
ipt = iptables

etc. but have never knowingly used an alias. Don't forget I am a Linux
novice. Everything I currently know I have taught myself either from
books, experimentation or examples on this list or adapted from similar
things from pre-Linux days. 

> > I call my script .arin
> >
> > .arin 64.64.64.64
> >
> > produces a normal output.
> 
> 
> Out of interest, have you thought about sending this through to the 
> NANOG (http://www.nanog.org/mailinglist/) list?

Never heard of them. It see it is the North American Network Operators'
Group. Following your suggestion I will repost the item there.

Regards,

Paul.


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Re: [CentOS] CentOS 6: ethernet "ifconfig up" failure

[Michael D. Berger]

On Sun, 11 Sep 2011 20:21:21 -0400, Robert Spangler wrote:

> On Sunday 11 September 2011 14:57, the following was written:
> 
>>  So why is "ifconfig eth0 up" not connecting?
> 
> Have you tried 'ifup eth0'?

I have now, it works fine.

Thanks,
Mike.

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Re: [CentOS] KVM on CentOS 6

[Emmett Culley]

On 09/08/2011 10:34 AM, m.r...@5-cent.us wrote:
> Emmett Culley wrote:
>> On 09/08/2011 09:07 AM, m.r...@5-cent.us wrote:
>>> Emmett Culley wrote:
 On 09/08/2011 02:25 AM, Nick wrote:
> On 08/09/11 07:23, Emmett Culley wrote:
>> Today I suddenly have two VMs that have read only file systems.  The
>> host is CentOS 6, as are the two VMs with this problem.
> 
 the one that is still available.  The last lines of syslog
 (/var/log/messages) are:
>>> 
 Sep  7 21:59:23 dev kernel: ata1.00: exception Emask 0x0 SAct 0x0 SErr
 0x0
 action 0x6 frozen
 Sep  7 21:59:23 dev kernel: ata1.00: failed command: WRITE DMA
 Sep  7 21:59:23 dev kernel: ata1.00: cmd
 ca/00:08:a0:02:31/00:00:00:00:00/e3 tag 0 dma 4096 out
 Sep  7 21:59:23 dev kernel: res
 40/00:01:00:00:00/00:00:00:00:00/a0 Emask 0x4 (timeout)
 Sep  7 21:59:23 dev kernel: ata1.00: status: { DRDY }
 Sep  7 21:59:23 dev kernel: ata1: soft resetting link
 Sep  7 21:59:23 dev kernel: ata1.00: configured for MWDMA2
 Sep  7 21:59:23 dev kernel: ata1.00: device reported invalid CHS sector
 0
 Sep  7 21:59:23 dev kernel: ata1: EH complete
>>> 
>>> Bad news, IMO: I think you have a hardware problem - looks like sector 0
>>> of your h/d has gone bad.
>>>
>>> Got backups? Got spare drive?
>>>
>> Except that this "hardware" is on the guest and so is virtual.  The image
>> is actually a LVM logical volume.  So, it must be either a kvm/qemu or a
>> kernel bug.  I am working on getting a bug reported, as soon as I figure
>> out where to report it.
> 
> Are you sure that the host o/s isn't passing a real error up? Are there
> errors in the host's logfile?
> 
>   mark

Turns out you were correct.  I did see the same error on the host, though with 
an hour earlier time stamp.

I replaced that drive and all seems well now.

Thanks for your insight.

Emmett

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Re: [CentOS] TIP for broken ARIN whois

[Steve Walsh]

  On 09/11/2011 12:26 AM, Always Learning wrote:
> This works for me on Centos 5.6. It may assist newcomers to the Linux
> world of Centos.
>
>   whois 51.51.51.51
>
> produces a normal and conventional display of data.
>
> However since ARIN, the North American registrar of IP addresses,
> "modernised" its WHOIS processing, a query to
>
>   whois 64.64.64.64
>
> will produce a one line summary of possible matches, which always
> includes ARIN, but omits the details we used to receive before ARIN
> implemented its much criticised "improved" service.
>
> A one line script solves it for me (but only for ARIN network entries).
>
>   #!/bin/bash
>   whois -h whois.arin.net n + $1

Any particular reason you used a bash script as opposed to an alias in 
your bash config?

> I call my script .arin
>
>   .arin 64.64.64.64
>
> produces a normal output.


Out of interest, have you thought about sending this through to the 
NANOG (http://www.nanog.org/mailinglist/) list?
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Re: [CentOS] No MySQL password in ps aux!

[Craig White]

On Sun, 2011-09-11 at 19:56 +0300, Dotan Cohen wrote:
> On Sun, Sep 11, 2011 at 19:35, Craig White  wrote:
> > you'd still have it in bash_history though so it's really a poor idea to
> > ever pass a significant password directly on the command line execution
> > - whether visible or not visible to ps. Much better is to be prompted
> > for the password instead...
> >
> > mysql mysql -u root -p
> >
> > and it will prompt
> >
> > another option is to have ~/.my.cnf which already has your password
> >
> > Craig
> >
> 
> Actually, it's not in Bash history because I log in from a remote
> server like this:
> $ ssh -t dotan@1.2.3.4 "mysql -u root -pSECRET"
> 
> That, in turn, is actually aliased to something else. Therefore the
> login info does appear in my _local_ alias file, but if that is
> compromised then there is no reason to assume that ~/.ssh/ isn't also
> compromised, and vice versa.
> 
> Additionally, one could add a space before a command to prevent it
> from being written to the history, I do this when encrypting files
> with openssl.

not exactly sure what point you are trying to make about being
compromised - not all that relevant but you can still just use -p option
without the password and get prompted for the password which actually
solves your question.

Also, since MySQL is client/server you could probably use the mysql
client on your local machine and connect to the server and use
encryption but that isn't what you asked.

Also, presuming you are using bash on the originating machine, you would
have it in bash_history, just on a different machine. The point I was
trying to make is that it is generally a poor idea to put a password
into a shell command whether mysql or whatever.

Craig



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Re: [CentOS] CentOS 6: ethernet "ifconfig up" failure

[Al]

Have you tried;

cd /etc/sysconfig/network-scripts/
./ifup ifcfg-eth0

On Sep 11, 2011, at 8:21 PM, Robert Spangler wrote:

> On Sunday 11 September 2011 14:57, the following was written:
> 
>> So why is "ifconfig eth0 up" not connecting?
> 
> Have you tried 'ifup eth0'?
> 
> 
> -- 
> 
> Regards
> Robert
> 
> Linux
> The adventure of a lifetime.
> 
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Re: [CentOS] CentOS 6: ethernet "ifconfig up" failure

[Robert Spangler]

On Sunday 11 September 2011 14:57, the following was written:

>  So why is "ifconfig eth0 up" not connecting?

Have you tried 'ifup eth0'?


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Re: [CentOS] persistent custom lines in /etc/hosts?

[R - elists]

 
> 
> I've edited /etc/hosts to add few custom IP/hostnames couples.
> After each reboot, I have to add them again. I've then added 
> /etc/sysconfig/network/hosts, but it seems to ignore it or at 
> least ignore 127.0.0.1 assignments I'm doing in it.
> 
> Is there a mechanism I'm not aware of, or doing things wrong 
> to make my custom IP/hostnames assignments permanent after 
> network services restart?
snip
> wwp

you didnt tell us much about your centos version etc so

is your networking set up statically, or is it dhcp dynamic.

if the latter, then "possibly" that is part of the issue

ive always noticed that files like /etc/resolv.conf and others can change in
a generic dhcp environment

...one reason we setup almost everything statically

 - rh

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Re: [CentOS] XORG and LCD Projector

[ken]

A long time ago I did this.  I think I was using Suse 9.3 at the time. 
(That's how long ago it was!!)  It was so easy-- taking less than a 
minute-- that I don't remember how I did it.

My "muttbox" is a Dell i600m.   is the key to switch among the 
video options we're talking about.  This probably isn't any kind of a 
standard, but unless you're positive  is the right key combo, 
you might want to try .

Make sure the projector is plugged in and then turned on before hitting 
the CRT combo.

If an error reports the sync rate is different on the projector, change 
the specs running the LCD (internal) monitor.

I didn't have to do this, but it might help in your situation: with 
things connected, turned on, and set up as above, restart hal.  This 
will kick it to do a hardware rescan.  (This has worked for me 
hotplugging other hardware... never tried it in a projector (2nd 
monitor) situation.)

Hope you get this working.  If/When you do, please report back how.  I'm 
sure someone else will need to know how to do this before long.


On 09/11/2011 10:52 AM Andrew 'Dewa' B. Osmond wrote:
> @Christopher Hawker :
> my laptop version is M54SR, old version of Axioo.
> 
> @Robert Heller :
> VGA or DVI?
> --> VGA
> 
> Which screen is blank? The notebook's or the LCD Projector or both?
> --> LCD Projector
> 
> Is the LCD Projector displaying a message to the effect that an
> unsupported sync rate or video mode in being used?
> --> No. Nothing's happen. Just blank screen. I think it's becaused lcd 
> projector mode maybe doesn't same with xorg but I don't know how to 
> configure it.
> 
> On Sun, Sep 11, 2011 at 9:25 PM, Robert Heller  > wrote:
> 
> At Sun, 11 Sep 2011 20:34:30 +0700 CentOS mailing list
> mailto:centos@centos.org>> wrote:
> 
>  >
>  >
>  >
>  > dear guys,
>  >
>  > I have a problem between my CentOS 5.5 (on Axioo notebook) and LCD
>  > Projector. When I connect my notebook to LCD Projector, it can
> detect my
>  > notebook.
> 
> VGA or DVI?
> 
>  > But when I press Fn + F7 to activate dual monitor between my
> notebook and
>  > LCD Projector it goes to blank screen. FYI, the LCD Projector is
> NEC but I
>  > don't know the series.
> 
> Which screen is blank? The notebook's or the LCD Projector or both?
> 
>  > I've tried to change display using dual head monitor but it has
> no effects.
> 
> There are two different things going on here.
> 
> "dual head monitor" normally means that the two monitors display
> *different* stuff.  This *usually* implies that the *video card*
> specificly supports two independent monitors, usually by having two
> frame buffers and two video outputs.  This usually also implies *two*
> Device sections in xorg.conf, eg you (logically) have two video cards
> installed (even if they are both on the same physical 'card' or even
> same
> physical 'chip').
> 
> *Most* laptops/notebooks DON'T have "dual head monitor" capable video
> cards.  What they have is a video output that goes to a logical "Y"
> connection: *one* frame buffer+video output circuit, going to two video
> connections, one being the internal LCD and the other being the VGA (or
> DVI with newer laptops/notebooks) connector.
> 
> The Fn + F7 generally toggles between two or three states:
> 
> Video goes to the internal screen.
> Video goes to the external screen.
> Video goes to both screens (*some* laptops/notebooks can't do this, esp.
> if the scan rates are incompatible).
> 
> In all cases there is only one video 'Device'.  The Fn + F7's logic is
> like pluging in different monitors into the *one* video output
> connection on a desktop.
> 
> 
>  > Do I need some driver??
> 
> Probably not.  It might be that you need to have different things in
> your Screen section, partitularly in the Display SubSection.  It might
> be that the LCD Projector cannot handle the display mode(s) specificed.
> Is the LCD Projector displaying a message to the effect that an
> unsupported sync rate or video mode in being used?
> 
>  >
>  > and this is my xorg configuration :
>  > Section "Device"
>  > Identifier  "Videocard0"
>  > Driver  "openchrome"
>  > EndSection
>  >
>  > Section "Screen"
>  > Identifier "Screen0"
>  > Device "Videocard0"
>  > DefaultDepth 24
>  > SubSection "Display"
>  > Viewport   0 0
>  > Depth 24
>  > Modes"1280x800" "1024x768" "800x600" "640x480"
>  > EndSubSection
>  > EndSection
>  >
>  > Hope you guys can help me. Thanks.
>  >
>  >
>  > Andrew.
>  >
>  > MIME-Version: 1.0
>  >
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[CentOS] Vitualization and Partitioning

[Thomas Dukes]

Hello,

OK, getting ready to order a new machine and had some questions about 6.0.
It will have a single 500GB HD.

When I do the install, do I or should I setup a separate partition for guest
OS's? From the redhat docs, it looks like the guest OS's reside at
/var/lib/libvirt/images/.  I may combine my windoze XP on the CentOS machine
so would I need to create a partition and format that at installation? If I
decide to wait and go with Windoze 7 can I still create the partition later?

I would like a partition scheme that allows for easier upgrades or installs
without losing data.

Thanks, I'm more confused now that when I started reading about this stuf..

Eddie

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Re: [CentOS] gnumeric

[ken]

On 09/10/2011 03:01 PM Frank Cox wrote:
> On Sat, 10 Sep 2011 14:40:47 
> ken wrote:
> 
>> Where do I find a gnumeric rpm?  I must not have enough repos listed.
> 
> http://www.elders.princeton.edu/data/puias/6/x86_64/os/Addons/
> 

Thanks, Frank.  That isn't the exact version I was looking for, but just 
getting on that server and poking around I found 
 
where resides gnumeric-1.6.3-15.PU_IAS.5.2.src.rpm  So I'm on the 
way.  Thanks again.

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[CentOS] persistent custom lines in /etc/hosts?

[wwp]

Hello there,


I've edited /etc/hosts to add few custom IP/hostnames couples.
After each reboot, I have to add them again. I've then
added /etc/sysconfig/network/hosts, but it seems to ignore it or at
least ignore 127.0.0.1 assignments I'm doing in it.

Is there a mechanism I'm not aware of, or doing things wrong to make my
custom IP/hostnames assignments permanent after network services
restart?

Regards,

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Re: [CentOS] CentOS 6: ethernet "ifconfig up" failure

[Andrew Dorozhkin]

11.09.2011 22:57, Michael D. Berger wrote:
> On my CentOS 6 partition of my laptop:
>
> First note that for this test, NetworkManager is not
> running because I did:
> chkconfig --del NetworkManager
> and then rebooted.
>
> Here is my ifcfg-eth0:
>
> DEVICE="eth0"
> NM_CONTROLLED="no"
> ONBOOT=no
> HWADDR=xx:xx:xx:xx:xx:xx
> TYPE=Ethernet
> BOOTPROTO=none
> IPADDR=192.168.2.5
> PREFIX=24
> GATEWAY=192.168.2.1
> DNS1=192.168.2.1
> DNS2=192.168.2.1
> DEFROUTE=yes
> IPV4_FAILURE_FATAL=yes
> IPV6INIT=no
> NAME="System eth0"
> UUID=----
>
> I reboot to level3, do startx (to KDE 4) then do:
> # ifconfig eth0 up
> # ping 192.168.9.1
> connect: Network is unreachable
>
> If I edit ifcfg-eth0 to set
> ONBOOT=yes
> and reboot, I get a proper connection.
>
> So why is "ifconfig eth0 up" not connecting?
>
> Thanks for your help.
> Mike.
>
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You should not use 'PREFIX=...' parameter if you prefer static network 
settings
functionality provided by initscripts rather than NM daemon. I believe 
is is not honored
by ifup* scripts and is not documented by el6 deployment guide either. Use
'NETMASK=...' instead and then issue the command 'ifup eth0' to bring 
your NIC up
and running.
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Re: [CentOS] CentOS 6: ethernet "ifconfig up" failure

[Bernd Bartmann]

On Sun, Sep 11, 2011 at 8:57 PM, Michael D. Berger wrote:
> On my CentOS 6 partition of my laptop:
>
> First note that for this test, NetworkManager is not
> running because I did:
>   chkconfig --del NetworkManager
> and then rebooted.
>
> Here is my ifcfg-eth0:
>
> DEVICE="eth0"
> NM_CONTROLLED="no"
> ONBOOT=no
> HWADDR=xx:xx:xx:xx:xx:xx
> TYPE=Ethernet
> BOOTPROTO=none
> IPADDR=192.168.2.5
> PREFIX=24
> GATEWAY=192.168.2.1
> DNS1=192.168.2.1
> DNS2=192.168.2.1
> DEFROUTE=yes
> IPV4_FAILURE_FATAL=yes
> IPV6INIT=no
> NAME="System eth0"
> UUID=----
>
> I reboot to level3, do startx (to KDE 4) then do:
> # ifconfig eth0 up
> # ping 192.168.9.1
> connect: Network is unreachable
>
> If I edit ifcfg-eth0 to set
>   ONBOOT=yes
> and reboot, I get a proper connection.
>
> So why is "ifconfig eth0 up" not connecting?

"ifconfig" is a low level tool that does not parse the config files
like ifcfg-eth0. You'll either have to use:

ifconfig eth0 192.168.2.5
route add default gw 192.168.2.1

or

ifup eth0

The latter one is a script that parses all the config files.

Best regards,
Bernd.
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Re: [CentOS] CentOS 6: ethernet "ifconfig up" failure

[Rodrigo K. Ferreira]

Hello,

Please use ethtool ethX and verify if link is detected or not.

Att.,

Rodrigo Kellermann Ferreira


On Sun, Sep 11, 2011 at 3:57 PM, Michael D. Berger <
m_d_berger_1...@yahoo.com> wrote:

> On my CentOS 6 partition of my laptop:
>
> First note that for this test, NetworkManager is not
> running because I did:
>   chkconfig --del NetworkManager
> and then rebooted.
>
> Here is my ifcfg-eth0:
>
> DEVICE="eth0"
> NM_CONTROLLED="no"
> ONBOOT=no
> HWADDR=xx:xx:xx:xx:xx:xx
> TYPE=Ethernet
> BOOTPROTO=none
> IPADDR=192.168.2.5
> PREFIX=24
> GATEWAY=192.168.2.1
> DNS1=192.168.2.1
> DNS2=192.168.2.1
> DEFROUTE=yes
> IPV4_FAILURE_FATAL=yes
> IPV6INIT=no
> NAME="System eth0"
> UUID=----
>
> I reboot to level3, do startx (to KDE 4) then do:
> # ifconfig eth0 up
> # ping 192.168.9.1
> connect: Network is unreachable
>
> If I edit ifcfg-eth0 to set
>   ONBOOT=yes
> and reboot, I get a proper connection.
>
> So why is "ifconfig eth0 up" not connecting?
>
> Thanks for your help.
> Mike.
>
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[CentOS] CentOS 6: ethernet "ifconfig up" failure

[Michael D. Berger]

On my CentOS 6 partition of my laptop:

First note that for this test, NetworkManager is not
running because I did:
   chkconfig --del NetworkManager
and then rebooted.

Here is my ifcfg-eth0:

DEVICE="eth0"
NM_CONTROLLED="no"
ONBOOT=no
HWADDR=xx:xx:xx:xx:xx:xx
TYPE=Ethernet
BOOTPROTO=none
IPADDR=192.168.2.5
PREFIX=24
GATEWAY=192.168.2.1
DNS1=192.168.2.1
DNS2=192.168.2.1
DEFROUTE=yes
IPV4_FAILURE_FATAL=yes
IPV6INIT=no
NAME="System eth0"
UUID=----

I reboot to level3, do startx (to KDE 4) then do:
# ifconfig eth0 up
# ping 192.168.9.1
connect: Network is unreachable

If I edit ifcfg-eth0 to set
   ONBOOT=yes
and reboot, I get a proper connection.

So why is "ifconfig eth0 up" not connecting?

Thanks for your help.
Mike.

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Re: [CentOS] No MySQL password in ps aux!

[Dotan Cohen]

On Sun, Sep 11, 2011 at 19:35, Craig White  wrote:
> you'd still have it in bash_history though so it's really a poor idea to
> ever pass a significant password directly on the command line execution
> - whether visible or not visible to ps. Much better is to be prompted
> for the password instead...
>
> mysql mysql -u root -p
>
> and it will prompt
>
> another option is to have ~/.my.cnf which already has your password
>
> Craig
>

Actually, it's not in Bash history because I log in from a remote
server like this:
$ ssh -t dotan@1.2.3.4 "mysql -u root -pSECRET"

That, in turn, is actually aliased to something else. Therefore the
login info does appear in my _local_ alias file, but if that is
compromised then there is no reason to assume that ~/.ssh/ isn't also
compromised, and vice versa.

Additionally, one could add a space before a command to prevent it
from being written to the history, I do this when encrypting files
with openssl.

-- 
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http://gibberish.co.il
http://what-is-what.com
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Re: [CentOS] No MySQL password in ps aux!

[Craig White]

On Sun, 2011-09-11 at 19:32 +0300, Dotan Cohen wrote:
> I just noticed that some CentOS 4 or 5 machine that I don't admin but
> have root access to hides MySQL passwords from ps:
> 
> Console 1:
> $ mysql -u root -pSECRET
> mysql >
> 
> Console2:
> # ps aux
> root 32165  0.0  0.1 109408  2204 pts/1Ss+  11:19   0:00 mysql
> -u root -px xx
> 
> That is really nice, is it a MySQL feature or a CentOS feature? I have
> some other servers that I _do_ admin and I'd like to enable this.

you'd still have it in bash_history though so it's really a poor idea to
ever pass a significant password directly on the command line execution
- whether visible or not visible to ps. Much better is to be prompted
for the password instead...

mysql mysql -u root -p

and it will prompt

another option is to have ~/.my.cnf which already has your password

Craig


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[CentOS] No MySQL password in ps aux!

[Dotan Cohen]

I just noticed that some CentOS 4 or 5 machine that I don't admin but
have root access to hides MySQL passwords from ps:

Console 1:
$ mysql -u root -pSECRET
mysql >

Console2:
# ps aux
root 32165  0.0  0.1 109408  2204 pts/1Ss+  11:19   0:00 mysql
-u root -px xx

That is really nice, is it a MySQL feature or a CentOS feature? I have
some other servers that I _do_ admin and I'd like to enable this.

Thanks!

-- 
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Re: [CentOS] CentOS 6 Installation on Thinkpad X220

[Janne TH. Nyman]

> And she changed it from AHCI to compatibility mode (had to change itto
> that mode to make the drive being recognized?), which is not the best
> setting regarding speed.
Alexander: The she is actually a he :)

> Quite right, sorry, I'd read it backwards.  So presumably either a bug
> in the
> AHCI support, or a limitation/bug of the kernel driver?
> jh
John: Actually, this is a complete false alarm.

Actual Solution:
You don't have to change anything on these laptops. But it is a good tip
that when installing from external cd/dvdrom, if it first does not work,
change usb port and try again.

I changed back the BIOS to AHCI. I was previously plugged into the top
left USB port I.e. the one on the left hand side closes to the monitor
or back side.

When lenovo's external CDROM/DVD is plugged into this port, I am unable
to install linux in general or other OS's. Once I plug it into any of
the other USB ports bottom left or right, it works perfectly.

No wonder I haven't found any problem posts regarding x220 and
CentOS/RHEL.

Thanks for all your time supporting me. Fantastic responses on this
mailing list.

Use external CD/DVD ROM, just ensure to plug it into the right port :)

Cheers,
Janne "Janski" Nyman
E: jny...@jbtec.org

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Re: [CentOS] XORG and LCD Projector

[Robert Heller]

At Sun, 11 Sep 2011 21:52:38 +0700 CentOS mailing list  
wrote:

> 
> 
> 
> @Christopher Hawker :
> my laptop version is M54SR, old version of Axioo.
> 
> @Robert Heller :
> VGA or DVI?
> --> VGA
> 
> Which screen is blank? The notebook's or the LCD Projector or both?
> --> LCD Projector
> 
> Is the LCD Projector displaying a message to the effect that an
> unsupported sync rate or video mode in being used?
> --> No. Nothing's happen. Just blank screen. I think it's becaused lcd
> projector mode maybe doesn't same with xorg but I don't know how to
> configure it.

Remove the '1280x800' video mode.  It is likely that the LCD Projector
is a standard 4:3 video device (this is implied by being a VGA device)
and is not going to handle a (near) 16:9 (wide screen) video mode.
Unless the LCD Projector is really, really, really old, it should
handle 1024x768 without problems.

> 
> On Sun, Sep 11, 2011 at 9:25 PM, Robert Heller  wrote:
> 
> > At Sun, 11 Sep 2011 20:34:30 +0700 CentOS mailing list 
> > wrote:
> >
> > >
> > >
> > > and this is my xorg configuration :
> > > Section "Device"
> > > Identifier  "Videocard0"
> > > Driver  "openchrome"
> > > EndSection
> > >
> > > Section "Screen"
> > > Identifier "Screen0"
> > > Device "Videocard0"
> > > DefaultDepth 24
> > > SubSection "Display"
> > > Viewport   0 0
> > > Depth 24
> > > Modes"1280x800" "1024x768" "800x600" "640x480"
^
This is probably the problem ___|

> > > EndSubSection
> > > EndSection
> > >
> > > Hope you guys can help me. Thanks.

-- 
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Re: [CentOS] XORG and LCD Projector

[Rob Kampen]

Andrew 'Dewa' B. Osmond wrote:

dear guys,

I have a problem between my CentOS 5.5 (on Axioo notebook) and LCD 
Projector. When I connect my notebook to LCD Projector, it can detect my 
notebook.
But when I press Fn + F7 to activate dual monitor between my notebook 
and LCD Projector it goes to blank screen. FYI, the LCD Projector is NEC 
but I don't know the series.
I've tried to change display using dual head monitor but it has no 
effects. Do I need some driver??


and this is my xorg configuration :
Section "Device"
Identifier  "Videocard0"
Driver  "openchrome"
EndSection

Section "Screen"
Identifier "Screen0"
Device "Videocard0"
DefaultDepth 24
SubSection "Display"
Viewport   0 0
Depth 24
Modes"1280x800" "1024x768" "800x600" "640x480"
EndSubSection
EndSection

Hope you guys can help me. Thanks.

My experience is this is due to the internal screen having a resolution 
that the external projector cannot handle.

Solution:
change your internal LCD screen resolution to one that the projector 
understands.

HTH


Andrew.




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Re: [CentOS] TIP for broken ARIN whois

[me]

On Sat, 10 Sep 2011, Always Learning wrote:

>
> On Sat, 2011-09-10 at 11:23 -0400, m...@tdiehl.org wrote:
>
>> Where is this syntax documented? I see the -h option in the man page
>> but the n + part is not there and I would like to understand where
>> that comes from.
>
>   whois -h whois.arin.net ?
>
> The ' n + ' are parameters (arguments) introduced by ARIN. They are not
> part of the standard WHOIS.

Thanks. That is what I was looking for.

Regards,

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Re: [CentOS] XORG and LCD Projector

[Andrew 'Dewa' B. Osmond]

@Christopher Hawker :
my laptop version is M54SR, old version of Axioo.

@Robert Heller :
VGA or DVI?
--> VGA

Which screen is blank? The notebook's or the LCD Projector or both?
--> LCD Projector

Is the LCD Projector displaying a message to the effect that an
unsupported sync rate or video mode in being used?
--> No. Nothing's happen. Just blank screen. I think it's becaused lcd
projector mode maybe doesn't same with xorg but I don't know how to
configure it.

On Sun, Sep 11, 2011 at 9:25 PM, Robert Heller  wrote:

> At Sun, 11 Sep 2011 20:34:30 +0700 CentOS mailing list 
> wrote:
>
> >
> >
> >
> > dear guys,
> >
> > I have a problem between my CentOS 5.5 (on Axioo notebook) and LCD
> > Projector. When I connect my notebook to LCD Projector, it can detect my
> > notebook.
>
> VGA or DVI?
>
> > But when I press Fn + F7 to activate dual monitor between my notebook and
> > LCD Projector it goes to blank screen. FYI, the LCD Projector is NEC but
> I
> > don't know the series.
>
> Which screen is blank? The notebook's or the LCD Projector or both?
>
> > I've tried to change display using dual head monitor but it has no
> effects.
>
> There are two different things going on here.
>
> "dual head monitor" normally means that the two monitors display
> *different* stuff.  This *usually* implies that the *video card*
> specificly supports two independent monitors, usually by having two
> frame buffers and two video outputs.  This usually also implies *two*
> Device sections in xorg.conf, eg you (logically) have two video cards
> installed (even if they are both on the same physical 'card' or even same
> physical 'chip').
>
> *Most* laptops/notebooks DON'T have "dual head monitor" capable video
> cards.  What they have is a video output that goes to a logical "Y"
> connection: *one* frame buffer+video output circuit, going to two video
> connections, one being the internal LCD and the other being the VGA (or
> DVI with newer laptops/notebooks) connector.
>
> The Fn + F7 generally toggles between two or three states:
>
> Video goes to the internal screen.
> Video goes to the external screen.
> Video goes to both screens (*some* laptops/notebooks can't do this, esp.
> if the scan rates are incompatible).
>
> In all cases there is only one video 'Device'.  The Fn + F7's logic is
> like pluging in different monitors into the *one* video output
> connection on a desktop.
>
>
> > Do I need some driver??
>
> Probably not.  It might be that you need to have different things in
> your Screen section, partitularly in the Display SubSection.  It might
> be that the LCD Projector cannot handle the display mode(s) specificed.
> Is the LCD Projector displaying a message to the effect that an
> unsupported sync rate or video mode in being used?
>
> >
> > and this is my xorg configuration :
> > Section "Device"
> > Identifier  "Videocard0"
> > Driver  "openchrome"
> > EndSection
> >
> > Section "Screen"
> > Identifier "Screen0"
> > Device "Videocard0"
> > DefaultDepth 24
> > SubSection "Display"
> > Viewport   0 0
> > Depth 24
> > Modes"1280x800" "1024x768" "800x600" "640x480"
> > EndSubSection
> > EndSection
> >
> > Hope you guys can help me. Thanks.
> >
> >
> > Andrew.
> >
> > MIME-Version: 1.0
> >
> > ___
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> > http://lists.centos.org/mailman/listinfo/centos
> >
> >
>
> --
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>
>
>
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Re: [CentOS] XORG and LCD Projector

[Christopher Hawker]

I am led to believe that external monitors have very little interaction in
terms of Monitor to PC. It may be a BIOS issue, try and have a look there.
What particular model of laptop do you have?

On Mon, Sep 12, 2011 at 12:20 AM, Andrew 'Dewa' B. Osmond <
dewa.n...@gmail.com> wrote:

> Here is my complete xorg.conf, Paul.
>
> # Xorg configuration created by system-config-display
>
> Section "ServerLayout"
> Identifier "single head configuration"
> Screen  0  "Screen0" 0 0
> InputDevice"Keyboard0" "CoreKeyboard"
> InputDevice"Synaptics" "CorePointer"
> EndSection
>
> Section "InputDevice"
> Identifier  "Keyboard0"
> Driver  "kbd"
> Option  "XkbModel" "pc105"
> Option  "XkbLayout" "us"
> EndSection
>
> Section "InputDevice"
> Identifier  "Synaptics"
> Driver  "synaptics"
> Option  "Device" "/dev/input/mice"
> Option  "Protocol" "auto-dev"
> Option  "Emulate3Buttons" "yes"
> EndSection
>
>
> Section "Device"
> Identifier  "Videocard0"
> Driver  "openchrome"
> EndSection
>
> Section "Screen"
> Identifier "Screen0"
> Device "Videocard0"
> DefaultDepth 24
> SubSection "Display"
> Viewport   0 0
> Depth 24
> Modes"1280x800" "1024x768" "800x600" "640x480"
> EndSubSection
> EndSection
>
> The sequence just device -> screen. I have no external device
> configuration. Maybe you know how to configure external device?
>
>
> On Sun, Sep 11, 2011 at 8:42 PM, Always Learning wrote:
>
>>
>> In my limited experience with notebooks and laptops, I found that
>> repeatedly pressing the keys works. The sequence I found was (not
>> necessarily in this order)
>>
>>screen
>>external device
>>screen and external device
>>
>> Paul.
>>
>
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Re: [CentOS] XORG and LCD Projector

[Robert Heller]

At Sun, 11 Sep 2011 20:34:30 +0700 CentOS mailing list  
wrote:

> 
> 
> 
> dear guys,
> 
> I have a problem between my CentOS 5.5 (on Axioo notebook) and LCD
> Projector. When I connect my notebook to LCD Projector, it can detect my
> notebook.

VGA or DVI?

> But when I press Fn + F7 to activate dual monitor between my notebook and
> LCD Projector it goes to blank screen. FYI, the LCD Projector is NEC but I
> don't know the series.

Which screen is blank? The notebook's or the LCD Projector or both?

> I've tried to change display using dual head monitor but it has no effects.

There are two different things going on here.

"dual head monitor" normally means that the two monitors display
*different* stuff.  This *usually* implies that the *video card*
specificly supports two independent monitors, usually by having two
frame buffers and two video outputs.  This usually also implies *two*
Device sections in xorg.conf, eg you (logically) have two video cards
installed (even if they are both on the same physical 'card' or even same
physical 'chip'). 

*Most* laptops/notebooks DON'T have "dual head monitor" capable video
cards.  What they have is a video output that goes to a logical "Y"
connection: *one* frame buffer+video output circuit, going to two video
connections, one being the internal LCD and the other being the VGA (or
DVI with newer laptops/notebooks) connector.

The Fn + F7 generally toggles between two or three states:

Video goes to the internal screen.
Video goes to the external screen.
Video goes to both screens (*some* laptops/notebooks can't do this, esp.
if the scan rates are incompatible).

In all cases there is only one video 'Device'.  The Fn + F7's logic is
like pluging in different monitors into the *one* video output
connection on a desktop.


> Do I need some driver??

Probably not.  It might be that you need to have different things in
your Screen section, partitularly in the Display SubSection.  It might
be that the LCD Projector cannot handle the display mode(s) specificed.
Is the LCD Projector displaying a message to the effect that an
unsupported sync rate or video mode in being used?

> 
> and this is my xorg configuration :
> Section "Device"
> Identifier  "Videocard0"
> Driver  "openchrome"
> EndSection
> 
> Section "Screen"
> Identifier "Screen0"
> Device "Videocard0"
> DefaultDepth 24
> SubSection "Display"
> Viewport   0 0
> Depth 24
> Modes"1280x800" "1024x768" "800x600" "640x480"
> EndSubSection
> EndSection
> 
> Hope you guys can help me. Thanks.
> 
> 
> Andrew.
> 
> MIME-Version: 1.0
> 
> ___
> CentOS mailing list
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> http://lists.centos.org/mailman/listinfo/centos
> 
>  

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Re: [CentOS] XORG and LCD Projector

[Andrew 'Dewa' B. Osmond]

Here is my complete xorg.conf, Paul.

# Xorg configuration created by system-config-display

Section "ServerLayout"
Identifier "single head configuration"
Screen  0  "Screen0" 0 0
InputDevice"Keyboard0" "CoreKeyboard"
InputDevice"Synaptics" "CorePointer"
EndSection

Section "InputDevice"
Identifier  "Keyboard0"
Driver  "kbd"
Option  "XkbModel" "pc105"
Option  "XkbLayout" "us"
EndSection

Section "InputDevice"
Identifier  "Synaptics"
Driver  "synaptics"
Option  "Device" "/dev/input/mice"
Option  "Protocol" "auto-dev"
Option  "Emulate3Buttons" "yes"
EndSection

Section "Device"
Identifier  "Videocard0"
Driver  "openchrome"
EndSection

Section "Screen"
Identifier "Screen0"
Device "Videocard0"
DefaultDepth 24
SubSection "Display"
Viewport   0 0
Depth 24
Modes"1280x800" "1024x768" "800x600" "640x480"
EndSubSection
EndSection

The sequence just device -> screen. I have no external device configuration.
Maybe you know how to configure external device?

On Sun, Sep 11, 2011 at 8:42 PM, Always Learning  wrote:

>
> In my limited experience with notebooks and laptops, I found that
> repeatedly pressing the keys works. The sequence I found was (not
> necessarily in this order)
>
>screen
>external device
>screen and external device
>
> Paul.
>
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Re: [CentOS] XORG and LCD Projector

[Always Learning]

On Sun, 2011-09-11 at 20:34 +0700, Andrew 'Dewa' B. Osmond wrote:

> But when I press Fn + F7 to activate dual monitor between my notebook
> and LCD Projector it goes to blank screen. FYI, the LCD Projector is
> NEC but I don't know the series.

In my limited experience with notebooks and laptops, I found that
repeatedly pressing the keys works. The sequence I found was (not
necessarily in this order)

screen
external device
screen and external device

Paul.


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[CentOS] XORG and LCD Projector

[Andrew 'Dewa' B. Osmond]

dear guys,

I have a problem between my CentOS 5.5 (on Axioo notebook) and LCD
Projector. When I connect my notebook to LCD Projector, it can detect my
notebook.
But when I press Fn + F7 to activate dual monitor between my notebook and
LCD Projector it goes to blank screen. FYI, the LCD Projector is NEC but I
don't know the series.
I've tried to change display using dual head monitor but it has no effects.
Do I need some driver??

and this is my xorg configuration :
Section "Device"
Identifier  "Videocard0"
Driver  "openchrome"
EndSection

Section "Screen"
Identifier "Screen0"
Device "Videocard0"
DefaultDepth 24
SubSection "Display"
Viewport   0 0
Depth 24
Modes"1280x800" "1024x768" "800x600" "640x480"
EndSubSection
EndSection

Hope you guys can help me. Thanks.


Andrew.
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[CentOS] Centos NFS-Utils

[Rita]

Just wondering,

We have been using RHEL 6.1 for a while and its NFS-utils support the fsc
option for caching. Will Centos 5.6(or .7) ever support this feature?




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