Re: [CentOS-es] ayuda con conexion a otro servidor

2007-09-17 Thread ArcosCom Linux User
¿Has probado con mount para ver dónde está montado el recurso remoto?

Salu2

El Dom, 16 de Septiembre de 2007, 22:41, luiso escribió:
 Amigos de la lista, soy nuevo con el CentOS
 hay una una opcion en el menu en  el CentOS con escritorio GNOME, sobre
 conectarse a un lugar remoto,
 ahora bien pongo la direccion IP del lugar remoto e indico que es un
 servidor windows, la conexion
 se efectúa sin problemas cuando pongo el passwd del administrador, y puedo
 acceder a los datos
 sin problemas y efectuar cualquier operacion de copiado o pegado de
 archivos, desde esa ventana que me
 abre el CentOS, todo OK.
 ahora bien he intentado acceder a esta conexion que crea el CentOS desde
 la
 consola y no hay forma en
 que la encuentre, es decir quiero tener acceso mediante consola a esa
 conexion que crea el CentOS, para
 poder visualizar los datos del servidor windows.
 Alguna idea, de donde se encuentra esto o donde más o menos encontrarlo.
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Re: [CentOS] Re: centos] CentOS 5 on IA64

2007-09-17 Thread James A. Peltier
Sorry to be a bit of a stickler, but can we please change the topic for
each architecture.  I am monitoring all posts containing IA64 or Itanium
to see when CentOS 5 support will be available and this thread has been
throwing *a lot* of false positives.

Thanks, and again, sorry to be so sticky.
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[CentOS] Re: Segmentation fault YUM

2007-09-17 Thread Karanbir Singh

umair shakil wrote:

I can right now define Segmentation Fault
When a process is trying to exceed the memroy location of what allocated 
to it, we normally face in this case segmentation fault.


That is not correct. a segfault is when a process will try to access 
memory that its not authorised to, eg. trying to write to memory marked 
read-only is the classic case.


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Re: [CentOS] Compiling mod_webauth on CentOS 5 - krb dependency failure

2007-09-17 Thread Garrick Staples
On Mon, Sep 17, 2007 at 12:43:18PM -0500, [EMAIL PROTECTED] alleged:
 Hello all,
 
  
 
 When I try to compile the mod_webauth module on CentOS 5, the dependencies
 for Kerberos fail.  I have the Kerberos libs installed, which is what I
 assume it's complaining about.   Ideas?  Is there an RPM missing?  Here's
 some of what I found:
 
  
 
 [EMAIL PROTECTED] webauth-3.5.4]# ./configure
 
 checking for gcc... gcc

What's with the double spacing?
 

 checking for krb5-config... no
 

$ yum provides krb5-config
...
krb5-devel.i386  1.3.4-49   installed
Matched from:
/usr/kerberos/bin/krb5-config


 [EMAIL PROTECTED] webauth-3.5.4]# rpm -qa | grep -i krb
 
 krb5-libs-1.5-26
 
 krb5-libs-1.5-29
 
 krb5-server-1.5-29
 
 pam_krb5-2.2.11-1
 
 pam_krb5-2.2.11-1
 
 krb5-workstation-1.5-26

You haven't installed krb5-devel.



pgpjjmoQaZOgg.pgp
Description: PGP signature
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Re: [CentOS] nVdia C15G chipset and GeForce 6100 on board graphix controller - SOLVED

2007-09-17 Thread Chris Geldenhuis

Chris Geldenhuis wrote:

Jim Perrin wrote:

On 8/29/07, Chris Geldenhuis [EMAIL PROTECTED] wrote:

 

I am new to installing drivers etc. Could you possible give me a few
pointers to help me along the way.



RPMForge makes installing the nvidia drivers reasonably easy. Simply
run 'yum install nvidia-x11-drv' and then reboot.

Instructions for RPMForge are at 
http://wiki.centos.org/Repositories/RPMForge



  

Hi again,

I have followed Jim's instructions to add the RPMforge repository and 
to download the nvidia-x11-drv driver from there.


When rebooting after this the system instruct me to re-configure the 
X11 configuration, when doing this using the gui screens provided I 
cannot select a screen but can select the nVidia card and then the 
nVidia driver. The configuration generated still does not work - I 
attach a copy of the Xorg.0.log generated. In this log there is a 
mention of using the GLX driver/module from nVidia.


While inspecting /usr/lib64/xorg/modules/extensions I noticed a 
sub-directory nvida that contained a file libglx.so. I renamed the 
libglx.so file in /usr/lib64/xorg/modules/extensions and copied the 
file in the nvidia sub directory into it's place - and rebooted. The 
reconfiguration of X11 still would not allow me to select a screen and 
also did not work. I attach a copy of the Xorg log Xorg.0.log.2 
where it seems as if the correct GLX module has now been found but 
without  giving me a useable X11 configuration.


Any suggestion on how to proceed from here would be welcome - if 
entails getting another graphics card please suggest a suitable card 
that will run without hassles.


TIA

ChrisG


snip
/snip

Hi All,

I have finally found the solution to the problem of the invisible mouse 
pointer - from a tip given to me by Chris from Tangent Systems.


When you insert an Option line as shown below in the Device section of 
the xorg.conf file the mouse pointer stays visible.


Section Device
   Identifier  Videocard0
   Driver  nv
   Option  HWCursoroff
EndSection

ChrisG
ChrisG
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Re: [CentOS] Installation troubles

2007-09-17 Thread Chuck Campbell
On Thu, Sep 13, 2007 at 10:11:35PM +0100, Karanbir Singh wrote:
 
 This is one the major issues with the Linux process these days, as you move 
 from kernel to kernel there is almost zero assurance of driver abi/api 
 stability - and that in turn creates a situation like this wherein one 
 kernel works while another does not. Its enough of a situation that on a 
 lot of platforms sysadmins will not upgrade a kernel unless they really 
 really need to. On CentOS and the EL codebase, this isnt so much of an 
 issue because upstream do some work on trying to make sure they dont break 
 driver compatibility. If they do break this compatibility, its easy to 
 detect.
 
 And most of the heavy lifting is getting done by a fairly simple shell 
 script called weak-modules, based in /sbin/ and comes from 
 module-init-tools.rpm
 
 weak-modules will basically take a given driver .ko and check what other 
 kernels installed at this time will work with it, it will then create the 
 symlinks for each of those kernels to point at this .ko. It will then check 
 each initrd in the /boot dir, and update each initrd for kernels it found 
 compatible with the driver. Rather than overwrite the initrd, it will 
 create a new one with the same-name but followed by a number. It will then 
 edit /etc/grub.conf and add a *new* section for this just created initrd. 
 So when you reboot the machine you have the choice to boot the kernel.rpm 
 shipped initrd or the newly updated one.
 
 Ok, so how does this work ? lets say you have drivers ( from install time ) 
 in /lib/modules/2.6.8-8.el5/updates/
 
 1) sudo to root
 
 2) find /lib/modules/2.6.8-8.el5/updates | /sbin/weak-modules --add-modules
This didn't work.  I did:
  ls -1 /lib/modules/2.6.8-8.el5/updates | /sbin/weak-modules --add-modules
 
 3) watch the blinking lights, depending on how many kernels you have 
 installed it could be a few seconds
 
 4) check /boot/ and make sure you have the new updated initrd's for all 
 kernels you thought it would work with.
 
 5) check /etc/grub.conf for new sections [1]
 
 6) reboot with whatever kernel + initrd you want

All worked fine for the 2.6.18-8.1.8.el5xen kernel.
 
 7) all further kernels brought down by yum from the centos repos will auto 
 magically get this driver included in the initrd. ( rpm -q --scripts 
 kernel-version will show you what happens in the post install section, and 
 how weak-updates does an --add-kernel )

New kernel was released, so I did yum update.  The new kernel boots, but
does not see the raid devices on the 3ware card.  the update also seems to
have removed my install kernel (2.6.18-8.el5xen).  Did that step on 
something?  If I boot the 2.6.18-8.1.8el5xen kernel, I still see my raid
devices, so it worked for the first update...

 I will try this in a few moments.  One last observation though, 3Ware has
 a newer driver for the updated kernel.  If I wish to use it, is it a simple
 matter of replacing the 3w-9xxx.ko file with the appropriate one?  If it
 is more complicated than that, where do I find info about this issue?
 
 well, in this case, build that .ko agains the oldest kernel-devel you have 
 on the machine ( ideally, I should say only against the installtime kernel, 
 but lots of people dont have that hanging around :/ ) and weak-modules 
 should do its magic.

There is a pre-built (by 3ware) .ko file for 2.6.18-8.1.8.el5xen  

I don't know what to do with it though.

 Slight change in plan, I did this braindump and you get to write the wiki 
 page :) 

I've never done a wiki page, but I'm okay with writing this all up, once I
understand it.  I can put what you wrote above (with some minor fixes), but
it didn't exactly work out for further kernel updates...  Not sure what
to say about that.

 You might also want to look and see how the 
 /lib/modules/kver/extras/ directory contents are handled and include some 
 info on that. Since that would basically address non install time .ko

The extras dir in the orig install kernel tree is empty.  So is the 
weak-updates dir, since the kernel update removed the install kernel???

The 2.6.18-8.1.8.el5xen tree has a weak updates tree which appears to duplicate
the old lib/modules tree.  It looks like this:

/lib/modules/2.6.18-8.1.8.el5xen/weak-updates/lib/modules/2.6.18-8.el5xen/updates/3w-9xxx.ko

So I'm completely confused at this point...

-chuck

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[CentOS] Compiling mod_webauth on CentOS 5 - krb dependency failure

2007-09-17 Thread mike
Hello all,

 

When I try to compile the mod_webauth module on CentOS 5, the dependencies
for Kerberos fail.  I have the Kerberos libs installed, which is what I
assume it's complaining about.   Ideas?  Is there an RPM missing?  Here's
some of what I found:

 

[EMAIL PROTECTED] webauth-3.5.4]# ./configure

checking for gcc... gcc

checking for C compiler default output file name... a.out

checking whether the C compiler works... yes

checking whether we are cross compiling... no

checking for suffix of executables...

checking for suffix of object files... o

checking whether we are using the GNU C compiler... yes

checking whether gcc accepts -g... yes

checking for gcc option to accept ISO C89... none needed

 

snip

 

checking for krb5-config... no

checking for library containing res_search... no

checking for library containing __res_search... -lresolv

checking for library containing crypt... -lcrypt

checking for krb5_init_context in -lkrb5... no

checking for krb5int_getspecific in -lkrb5support... no

checking for library containing pthread_setspecific... -lpthread

checking for krb5int_setspecific in -lkrb5support... no

checking for krb5_cc_default in -lkrb5... no

configure: error: cannot find usable Kerberos v5 library

[EMAIL PROTECTED] webauth-3.5.4]# 

 

However, when I search via rpm, I see:

 

[EMAIL PROTECTED] webauth-3.5.4]# rpm -qa | grep -i krb

krb5-libs-1.5-26

krb5-libs-1.5-29

krb5-server-1.5-29

pam_krb5-2.2.11-1

pam_krb5-2.2.11-1

krb5-workstation-1.5-26

[EMAIL PROTECTED] webauth-3.5.4]#

 

Thanks,

Mike.

 

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Re: [CentOS] strange chgrp behavior

2007-09-17 Thread William L. Maltby
On Tue, 2007-09-04 at 13:16 +0200, Tomas Ruprich wrote:
 Thanks for your reply and your time,
 i've reported it to centos bug tracking system. I will try it also on
 RHEL and if it occurs, i'll sent it also to the RH.

Good. If and when they close it, will you post in this thread so folks
know the result?

 
  ISTM it's a bug and should be reported on both CentOS and RH tracking
  systems. Two errors are apparent. One may be difficult to correct.
  
  As you originally discovered, the user ID is being change during
  execution of the command to change a group. And it is using the ID from
  the symbolic link owner, as you later noticed.
  
  The 2nd bug is a recursion into the original directory via the symbolic
  link when dereference is not suppressed. IMO, recursion should not
  occur, but I know from a programming background that it takes a little
  foresight, thought and intense effort to avoid this sort of trap.
 
 I think, that dereferrence should occure (at least for my coreutils
 version); man chgrp:
 --dereference
   affect the referent of each symbolic link, rather than the symbolic 
 link itself (this is the default)

I don't have an issue with dereference. My issue is is the recursion
into the directories that the symbolic link points to. This is a well
known potential problem when symbolic links point to places that have
symbolic links that (eventually) lead to the original symbolic link
again. Some packages (tar and find, IIRC and maybe some others) try to
avoid this trap in various ways.

IMO, all utilities that normally recurse in an environment wherein
looping via such mechanisms as symbolic links is possible should have
some basic checks trying to prevent eternal loops from occurring. I do
think the recursion, as reported in your OP, is a bug in that the
utility has not (apparently) made an attempt to prevent an interminable
loop.

But, that's my opinion from the days when we developers were expected to
do rigorous design and testing, rather than leaving it (intentionally)
to our users to suffer and report.

 snip

--
Bill

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[CentOS] Server Virtualization

2007-09-17 Thread Clint Dilks

Hello,

I work for a school in a New Zealand university and we are wanting to 
implement Server Virtualization for both CentOS and Windows systems.  So 
I thought I would ask here what experience people have had with this and 
what issues that you all think should be considered?


From my own research it seems that VMWare or Xen are really the two 
major products to be considered, are there any others I should be 
considering ?


Is anyone running Linux Guest O/S's inside a Windows host ??  And if 
so can you share your reasons for this?


Anyway thank you for your time and any experiences / knowledge you are 
willing to share :)


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[CentOS] openoffice 2.3 on centos 4.5

2007-09-17 Thread Jerry Geis

Would I have to be concerned about any issues if I put
open office 2.3 on centos 4.5?

Anyone done it?

Jerry
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Re: [CentOS] Server Virtualization

2007-09-17 Thread Steven Haigh

Quoting Clint Dilks [EMAIL PROTECTED]:

Hello,

I work for a school in a New Zealand university and we are wanting to
implement Server Virtualization for both CentOS and Windows systems.
So I thought I would ask here what experience people have had with this
and what issues that you all think should be considered?


Xen is great - however you will need Full virtualisation support in  
your hardware. These are shown as the ?vmx? flag for Intel or ?svm?  
for AMD CPUs in /proc/cpuinfo.


If you are running Windows guest in a linux Xen domain, you will want  
to pay for the Xen licenses. This gives you access to the windows  
drivers for disk and network etc - which improves performance immensely.



From my own research it seems that VMWare or Xen are really the two
major products to be considered, are there any others I should be
considering ?


I can only really speak for Xen...


Is anyone running Linux Guest O/S's inside a Windows host ??  And if
so can you share your reasons for this?


I'd say VMWare would be the way to do this - if you really had to.


Anyway thank you for your time and any experiences / knowledge you are
willing to share :)


The learning curve for Xen is huge. I would suggest a few things  
though if you decide to use it.


1) Setup your Dom0 (the host) disk to use LVM. You will want to make  
MANY partitions. Use a raw disk partition for disk access instead of a  
file as the disk - performance is much better this way.


2) If you're going to add Windows as a guest OS, make sure you get the  
Windows drivers. This is something you have to pay for, but the  
performance increase will be well worth it.


3) use 'xm top' on Dom0 to monitor what your guest systems are doing.  
Get yourself a multi processor system, and divide up usage between  
physical CPUs. This way, you get the best usage of your hardware.


4) Get lots and lots of RAM. We use systems with 8Gb RAM. We give the  
hypervisor 256Mb, and then chunks of 256Mb, 512Mb or 1Gb to each DomU  
depending on usage.


--
Steven Haigh

Email: [EMAIL PROTECTED]
Web: http://www.crc.id.au
Phone: (03) 9001 6090 - 0412 935 897

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Re: [CentOS] Server Virtualization

2007-09-17 Thread Timothy Selivanow
On Tue, 2007-09-18 at 11:20 +1200, Clint Dilks wrote:
 Hello,
 
 I work for a school in a New Zealand university and we are wanting to 
 implement Server Virtualization for both CentOS and Windows systems.  So 
 I thought I would ask here what experience people have had with this and 
 what issues that you all think should be considered?
 
  From my own research it seems that VMWare or Xen are really the two 
 major products to be considered, are there any others I should be 
 considering ?
 
 Is anyone running Linux Guest O/S's inside a Windows host ??  And if 
 so can you share your reasons for this?
 
 Anyway thank you for your time and any experiences / knowledge you are 
 willing to share :)

I use Xen personally and at work I work with VMware.  I don't have any
machines personally that have hardware virtualization extensions in the
processor, so I'm only doing para-virtualization with CentOS 5 as host
and guests.  Documentation seems a little sparse if you want to deviate
from the default configuration too much in Xen.  Other than that I've
been very happy with Xen.

At work we've been playing with VMware Infrastructure 3.  If you are
going to go the VMware route, this is by far the best bang for your
buck.  You are able to manage several VM hosts under one interface, and
if you are running Windows as a guest you can do some pretty neat things
(coming soon for the Linux side).  I've also used the free version,
VMware Server (also called GSX, Infrastructure comes with the version
called ESX) on both Windows and Linux...prefer using Linux though as the
host (much better stability and low-level options if you are into
customizing the environment).

Any more questions, like specifics, please ask.  I've been using Xen and
VMware for several months now.


-- 
Timothy Selivanow [EMAIL PROTECTED]
Linux System Administrator
EasyStreet Online Services, Inc.  http://www.easystreet.com


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Re: [CentOS] Server Virtualization

2007-09-17 Thread Phil Schaffner
On Tue, 2007-09-18 at 11:20 +1200, Clint Dilks wrote:
 Hello,
 
 I work for a school in a New Zealand university and we are wanting to 
 implement Server Virtualization for both CentOS and Windows systems.  So 
 I thought I would ask here what experience people have had with this and 
 what issues that you all think should be considered?
 
  From my own research it seems that VMWare or Xen are really the two 
 major products to be considered, are there any others I should be 
 considering ?

Those are probably the top contenders.

 Is anyone running Linux Guest O/S's inside a Windows host ??  And if 
 so can you share your reasons for this?

No.  If there are reasons, they are beyond my understanding.  :-)

 Anyway thank you for your time and any experiences / knowledge you are 
 willing to share :)

I use VMware Server  Workstation - primarily for testing new Linux
releases and for running Windows apps under Linux.  Have run some
services for testing purposes and find performance and functionality to
be pretty good.

You may want to join the new CentOS Virtualization list to find a more
targeted audience:

http://lists.centos.org/mailman/listinfo/centos-virt

Phil


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RE: [CentOS] Server Virtualization

2007-09-17 Thread Ross S. W. Walker
Clint Dilks wrote:
 
 Hello,
 
 I work for a school in a New Zealand university and we are wanting to 
 implement Server Virtualization for both CentOS and Windows 
 systems.  So 
 I thought I would ask here what experience people have had 
 with this and 
 what issues that you all think should be considered?

Irrespective of which virtual server solution you choose be aware that
virtualization brings with it steep storage requirements. Think of
providing around 1TB of RAID10 storage for 20 guests. VMs do lots of
tiny random IOs so for 20 guests split between 2 servers I provide
500GB of RAID10 to each via iSCSI SAN.

  From my own research it seems that VMWare or Xen are really the two 
 major products to be considered, are there any others I should be 
 considering ?

Not really.

 Is anyone running Linux Guest O/S's inside a Windows host 
 ??  And if 
 so can you share your reasons for this?

I do at work so I can prototype some Linux stuff on my Windows box.

 Anyway thank you for your time and any experiences / 
 knowledge you are 
 willing to share :)

I would try both VMware server and Xen on CentOS, if you have 2 servers
set them up side by side and plugged into your storage SAN. Run them
through their paces, do some benchmarks get a feel for ease of use and
maintenance.

When your ready and have a budget you can move up to the commercial
versions, ESX and Xen Enterprise.

-Ross

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Re: [CentOS] openoffice 2.3 on centos 4.5

2007-09-17 Thread [EMAIL PROTECTED]
On Mon, 17 Sep 2007 19:26:22 -0400
Jerry Geis [EMAIL PROTECTED] took out a #2 pencil and
scribbled:

 Would I have to be concerned about any issues if I put
 open office 2.3 on centos 4.5?
 
 Anyone done it?
 
 Jerry

I have it running on a fully updated CentOS 4 machine and it seems
to be okay. I've only used the writer portion for a few documents
though. I've been fairly absent from that laptop today.

Sincerely

-- 
Alex White
[EMAIL PROTECTED]
Life is a prison, death is a release
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Re: [CentOS] openoffice 2.3 on centos 4.5

2007-09-17 Thread Chris Mauritz

[EMAIL PROTECTED] wrote:

On Mon, 17 Sep 2007 19:26:22 -0400
Jerry Geis [EMAIL PROTECTED] took out a #2 pencil and
scribbled:

  

Would I have to be concerned about any issues if I put
open office 2.3 on centos 4.5?

Anyone done it?

Jerry



I have it running on a fully updated CentOS 4 machine and it seems
to be okay. I've only used the writer portion for a few documents
though. I've been fairly absent from that laptop today.
  


I don't recall having any issues on 4.5 either.  I've used both the 
writer and spreadsheet apps without incident.  Seems pretty solid and 
I'm trying to rely on it more so I can wean myself off M$ Office for good.


Best,

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Re: [CentOS] Re: Segmentation fault YUM

2007-09-17 Thread umair shakil
Dear Karanbir,

Please can u please explain me that trying to exceed the memroy or try to
gain the memory not authorized is there making any difference..

OR please i suppose my mistake was not using google exact defination :)


Regards,

Umair Shakil

On 9/17/07, Karanbir Singh [EMAIL PROTECTED] wrote:

 umair shakil wrote:
  I can right now define Segmentation Fault
  When a process is trying to exceed the memroy location of what allocated
  to it, we normally face in this case segmentation fault.

 That is not correct. a segfault is when a process will try to access
 memory that its not authorised to, eg. trying to write to memory marked
 read-only is the classic case.

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Re: [CentOS] Compiling mod_webauth on CentOS 5 - krb dependency failure

2007-09-17 Thread umair shakil
Dear,

Have u installed krb-deval package if yes then possibblly the reqiuired
library is not in that PATH.

Regards,

Umair Shakil
ETd

On 9/17/07, [EMAIL PROTECTED] [EMAIL PROTECTED] wrote:

  Hello all,



 When I try to compile the mod_webauth module on CentOS 5, the dependencies
 for Kerberos fail.  I have the Kerberos libs installed, which is what I
 assume it's complaining about.   Ideas?  Is there an RPM missing?  Here's
 some of what I found:



 [EMAIL PROTECTED] webauth-3.5.4]# ./configure

 checking for gcc... gcc

 checking for C compiler default output file name... a.out

 checking whether the C compiler works... yes

 checking whether we are cross compiling... no

 checking for suffix of executables...

 checking for suffix of object files... o

 checking whether we are using the GNU C compiler... yes

 checking whether gcc accepts -g... yes

 checking for gcc option to accept ISO C89... none needed



 snip



 checking for krb5-config... no

 checking for library containing res_search... no

 checking for library containing __res_search... -lresolv

 checking for library containing crypt... -lcrypt

 checking for krb5_init_context in -lkrb5... no

 checking for krb5int_getspecific in -lkrb5support... no

 checking for library containing pthread_setspecific... -lpthread

 checking for krb5int_setspecific in -lkrb5support... no

 checking for krb5_cc_default in -lkrb5... no

 configure: error: cannot find usable Kerberos v5 library

 [EMAIL PROTECTED] webauth-3.5.4]#



 However, when I search via rpm, I see:



 [EMAIL PROTECTED] webauth-3.5.4]# rpm -qa | grep -i krb

 krb5-libs-1.5-26

 krb5-libs-1.5-29

 krb5-server-1.5-29

 pam_krb5-2.2.11-1

 pam_krb5-2.2.11-1

 krb5-workstation-1.5-26

 [EMAIL PROTECTED] webauth-3.5.4]#



 Thanks,

 Mike.



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Re: [CentOS] Server Virtualization

2007-09-17 Thread umair shakil
Dear,

Yes, VMware is the product which is basically in the market. I have
installed and use once i mean
about 2 years back.

Well, through my research, VMware is only good if your are in a Tesing
Environment. It
is not recommended in the production environment. Because of following
reasons,

It uses Kernel Resources upto high and u need very High End Server
IF u are using 3 etc applications like (DNS, WEB, FTP), if the machine goes
down all
your three application goes down
High Demanding of memory

Regards,

Umair Shakil
ETD


On 9/18/07, Ross S. W. Walker [EMAIL PROTECTED] wrote:

 Clint Dilks wrote:
 
  Hello,
 
  I work for a school in a New Zealand university and we are wanting to
  implement Server Virtualization for both CentOS and Windows
  systems.  So
  I thought I would ask here what experience people have had
  with this and
  what issues that you all think should be considered?

 Irrespective of which virtual server solution you choose be aware that
 virtualization brings with it steep storage requirements. Think of
 providing around 1TB of RAID10 storage for 20 guests. VMs do lots of
 tiny random IOs so for 20 guests split between 2 servers I provide
 500GB of RAID10 to each via iSCSI SAN.

   From my own research it seems that VMWare or Xen are really the two
  major products to be considered, are there any others I should be
  considering ?

 Not really.

  Is anyone running Linux Guest O/S's inside a Windows host
  ??  And if
  so can you share your reasons for this?

 I do at work so I can prototype some Linux stuff on my Windows box.

  Anyway thank you for your time and any experiences /
  knowledge you are
  willing to share :)

 I would try both VMware server and Xen on CentOS, if you have 2 servers
 set them up side by side and plugged into your storage SAN. Run them
 through their paces, do some benchmarks get a feel for ease of use and
 maintenance.

 When your ready and have a budget you can move up to the commercial
 versions, ESX and Xen Enterprise.

 -Ross

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