[CentOS] Best way to take snapshots of iSCSI devices using Open-iSCSI + CentOS

[Santi Saez]

Hi,

I want to take snapshots of a iSCSI devices from a target that hasn't 
snapshot/cloning capabilities (it's a Infortrend A16E storage array).

What method are you using to make snapshots/clones of iSCSI targets 
using Open-iSCSI + CentOS? What about using Open-iSCSI + LVM snapshots 
system? For example:

- Take a LVM snapshot in the initiator with "lvcreate".
- Give read-only access to the backup server, for the same LUN/volume.
- In the backup server, mount in read-only mode this snapshot.
- Take a backup of this snapshot, using dd/tar/rsync for example.
- Unmount the snapshot in the backup server.
- Remove this snapshot from the host with "lvremove".

Is there any soft to make this? thanks! NOTE: It's a must, that device 
snapshots must be in other device.. not in the same target.

Regards,

--
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Re: [CentOS] Best way to take snapshots of iSCSI devices using Open-iSCSI + CentOS

[John R Pierce]

Santi Saez wrote:
> Hi,
>
> I want to take snapshots of a iSCSI devices from a target that hasn't 
> snapshot/cloning capabilities (it's a Infortrend A16E storage array).
>
> What method are you using to make snapshots/clones of iSCSI targets 
> using Open-iSCSI + CentOS? What about using Open-iSCSI + LVM snapshots 
> system? For example:
>
> - Take a LVM snapshot in the initiator with "lvcreate".
> - Give read-only access to the backup server, for the same LUN/volume.
> - In the backup server, mount in read-only mode this snapshot.
> - Take a backup of this snapshot, using dd/tar/rsync for example.
> - Unmount the snapshot in the backup server.
> - Remove this snapshot from the host with "lvremove".
>
> Is there any soft to make this? thanks! NOTE: It's a must, that device 
> snapshots must be in other device.. not in the same target.
>   

as I understand it, LVM snapshots are copy-on-write.   that means the 
data blocks of the LVM snapshot are quite dynamic when the underlying 
original volume is changing.  I do NOT think it would be even remotely 
safe to mount this read only on another environment as that OS wouldn't 
have a clue the underlying LVM stuff was being changed while its reading it.




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Re: [CentOS] Adding RAM

[Michael Holmes]

2008/12/6 Rainer Duffner <[EMAIL PROTECTED]>:
>
> Am 06.12.2008 um 01:02 schrieb Ignacio Vazquez-Abrams:
>> PAE, not SMP.
Gah, my mistake, sorry.
> He should be able to replace the kernel via rpm -e and rpm -i
> That said, I doubt he'll actually see a benefit.
> PAE is slow.
> If you want to see a real performance-gain, install 5.2 x86-64.
If this server is not mission-critical and therefore you wouldn't mind
the downtime I'd recommend this too. Of course it could be harder if
the server is Colo'd but for >4GB RAM x86-64 is the best way to go.

HTH,
Mike
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[CentOS] Cleaning centos to minimal set of RPMS

[Sergej Kandyla]

Hi,

I want to clean a centos box to get minimal (initial) set of packages.
How I can remove all RPMS excluding minimal required  RPMS  ?

Thanks in advice!
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Re: [CentOS] [OT] Firefox loses plugins, anyone else? Bug? Known?

[Matej Cepl]

On 2008-12-05, 23:48 GMT, William L. Maltby wrote:
>> I was able to _start_ a comparison process, not completed yet. 

What is the output of the command

mozilla-plugin-config -l

? And if you have flash-plugin in ~/.mozilla then many bad things 
will happen to you. Remove it and install the one from Adobe yum 
repo together with nspluginwrapper from CentOS repos.

Does it help?

Matěj

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Re: [CentOS] Best way to take snapshots of iSCSI devices using Open-iSCSI + CentOS

[nate]

Santi Saez wrote:
> Hi,
>
> I want to take snapshots of a iSCSI devices from a target that hasn't
> snapshot/cloning capabilities (it's a Infortrend A16E storage array).

Go get the snapshot software for the array?

http://www.infortrend.com/main/2_product/sw_snapshot.asp

Seems new, last time I checked out infortrend they didn't have
snapshot software.

nate

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Re: [CentOS] Centos 5.2 on Vmware Server: Disk space not preallocated -> no disk found by installer

[John]

> -Original Message-
> From: [EMAIL PROTECTED] 
> [mailto:[EMAIL PROTECTED] On Behalf Of Les Mikesell
> Sent: Friday, December 05, 2008 9:45 AM
> To: CentOS mailing list
> Subject: Re: [CentOS] Centos 5.2 on Vmware Server: Disk space 
> not preallocated -> no disk found by installer
> 
> Sven wrote:
> > Hi folks
> > 
> > I am trying to install CentOS 5.2 in Vmware Server 
> environment. In my
> > VM disk space is not preallocated for the virtual disk 
> (dynamically).
> > The installer doesn't find the disk. When preallocating 6 
> GB there is
> > no problem.
> > 
> > See screenshot[0]
> > 
> > Any ideas?
> > 
> 
> I can't see anything to indicate why it doesn't show the 
> disk, but I've 
> used dynamic disks for installation before.

You need to choose the "2.6" Kernel When choosing the type of install for a
Red Hat type Install then it will find your disk...Anything other than that
it will not find a disk or ask for drivers.

JohnStanley

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Re: [CentOS] Adding RAM

[Adam Tauno Williams]

> >> 2008/12/5 Matt <[EMAIL PROTECTED]>:
> >>> I have a server running Centos 4.7 32bit.  Will moving from 4Gig of
> >>> RAM to 8Gig do any good?  Since its 32bit I assume it will only be
> >>> able to address the first 4Gig not?
> >> As long as you are using a SMP kernel you can use up to 64GB of RAM
> >> (though each proccess can only address 4GB of this). So if you can
> >> find any trace of  "SMP" in the uname (grep is your friend) then it
> >> should work fine.
> > PAE, not SMP
> He should be able to replace the kernel via rpm -e and rpm -i
> That said, I doubt he'll actually see a benefit.
> PAE is slow.

It isn't slow;  it does have a performance penalty.  A 32bit box with
8GB serving many clients (as an IMAP server, file server, etc...) will
be faster than a 32bit box with 3GB of RAM.

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Re: [CentOS] Cleaning centos to minimal set of RPMS

[Kai Schaetzl]

Sergej Kandyla wrote on Sat, 06 Dec 2008 15:16:04 +0200:

> How I can remove all RPMS excluding minimal required  RPMS  ?

Yum remove all groups except for core.

Kai

-- 
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Get your web at Conactive Internet Services: http://www.conactive.com



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Re: [CentOS] [OT] Firefox loses plugins, anyone else? Bug? Known?

[Germán Andrés Pulido F.]

I have seen this exact same behavior under Fedora 9. it seems the bug is 
with firefox for some reason. It will happens when clicking over a link 
opens firefox. If firefox is already open, it works OK. I've found no 
solution yet, other than switching to opera for my browsing needs. I 
have the tabmixplus extension, I thought it was related. Do you have 
this extension?

Regards.

William L. Maltby wrote:
> On Fri, 2008-12-05 at 08:07 -0500, William L. Maltby wrote:
>> Fully up-to-date CentOS 5.2 and Firefox browser. A previous thread had a
>> problem with plugins disappearing. I've discovered, by accident, a
>> causal relationship.
>>
>> Running a Thunderbird mail client (could happen with others? Haven't
>> tested with Evolution yet.) I click a link that opens the browser. BANG!
>> The plugins.dat is "emptied".
>>
>> Restored from my rsync backup, repeat, BANG! "Empty" again.
>>
>> Now, if the browser is already open, NP.
> 
> s/open/opened via the desktop/
> 
>> Anyone can confirm?
>>
>> Known problem?
> 
> Got second cup of coffee downed and went to see if the bug was known
> here
> https://bugzilla.mozilla.org/buglist.cgi?query_format=specific&order=relevance+desc&bug_status=__open__&content=plugin
> 
> Didn't see a match. If someone can confirm, I'll post a bug.
> 
> BTW, 
> 
> Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.0.4) Gecko/2008111319
> CentOS/3.0.4-1.el5.centos Firefox/3.0.4
> 
> is CentOS stock AFAIK.
> 
>> 
> 


-- 

Cordialmente,


  GERMAN ANDRES PULIDO F.
  Ingeniero de Proyectos
  GLOBAL TECHNOLOGY SERVICES - GTS S.A.
  -
  Tel: (571) 658 34 10 ext 110
  Carrera 7b No. 123-46
  Bogotá-Colombia
  Sitio Web: www.gtscolombia.com
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Re: [CentOS] Adding RAM

[Ross Walker]

On Dec 5, 2008, at 7:18 PM, Rainer Duffner <[EMAIL PROTECTED]>  
wrote:

>
> Am 06.12.2008 um 01:02 schrieb Ignacio Vazquez-Abrams:
>
>> On Fri, 2008-12-05 at 23:57 +, Michael Holmes wrote:
>>> 2008/12/5 Matt <[EMAIL PROTECTED]>:
 I have a server running Centos 4.7 32bit.  Will moving from 4Gig of
 RAM to 8Gig do any good?  Since its 32bit I assume it will only be
 able to address the first 4Gig not?
>>> As long as you are using a SMP kernel you can use up to 64GB of RAM
>>> (though each proccess can only address 4GB of this). So if you can
>>> find any trace of  "SMP" in the uname (grep is your friend) then it
>>> should work fine.
>>
>> PAE, not SMP.
>>
>
>
> He should be able to replace the kernel via rpm -e and rpm -i
>
> That said, I doubt he'll actually see a benefit.
> PAE is slow.
> If you want to see a real performance-gain, install 5.2 x86-64.

He'll see a benefit. PAE slowdown is humanly unnoticeable for short- 
term transactions, it's difference is in high nano seconds or low  
micro seconds.

All 5.0 kernels are PAE by default.

So are WinXP_SP2/Win2K3/Vista/Win2k8 and Mac OS X kernels.

Only go 64-bit if it's completely necessary.

-Ross

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[CentOS] CentOS-announce Digest, Vol 46, Issue 4

[centos-announce-request]

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Today's Topics:

   1. CESA-2008:0981 Moderate CentOS 4 s390(x) ruby -   security
  update (Pasi Pirhonen)


--

Message: 1
Date: Fri, 5 Dec 2008 19:01:31 +0200
From: Pasi Pirhonen <[EMAIL PROTECTED]>
Subject: [CentOS-announce] CESA-2008:0981 Moderate CentOS 4 s390(x)
ruby -  security update
To: [EMAIL PROTECTED]
Message-ID: <[EMAIL PROTECTED]>
Content-Type: text/plain; charset="us-ascii"

CentOS Errata and Security Advisory 2008:0981

https://rhn.redhat.com/errata/RHSA-2008-0981.html

The following updated files have been uploaded and are currently
syncing to the mirrors:

s390:
updates/s390/RPMS/irb-1.8.1-7.el4_7.2.s390.rpm
updates/s390/RPMS/ruby-1.8.1-7.el4_7.2.s390.rpm
updates/s390/RPMS/ruby-devel-1.8.1-7.el4_7.2.s390.rpm
updates/s390/RPMS/ruby-docs-1.8.1-7.el4_7.2.s390.rpm
updates/s390/RPMS/ruby-libs-1.8.1-7.el4_7.2.s390.rpm
updates/s390/RPMS/ruby-mode-1.8.1-7.el4_7.2.s390.rpm
updates/s390/RPMS/ruby-tcltk-1.8.1-7.el4_7.2.s390.rpm

s390x:
updates/s390x/RPMS/irb-1.8.1-7.el4_7.2.s390x.rpm
updates/s390x/RPMS/ruby-1.8.1-7.el4_7.2.s390x.rpm
updates/s390x/RPMS/ruby-devel-1.8.1-7.el4_7.2.s390x.rpm
updates/s390x/RPMS/ruby-docs-1.8.1-7.el4_7.2.s390x.rpm
updates/s390x/RPMS/ruby-libs-1.8.1-7.el4_7.2.s390x.rpm
updates/s390x/RPMS/ruby-mode-1.8.1-7.el4_7.2.s390x.rpm
updates/s390x/RPMS/ruby-tcltk-1.8.1-7.el4_7.2.s390x.rpm


-- 
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[CentOS] squid server for 10,000 accounts

[linux-crazy]

Hi all,

  I am running squid proxy server integrated with Content filter
Dansguardian, squidguard  and clamav for Http level scanning on centos
5 .Configured webmin management tool  to create and manage access
control using squidguard plug in. Now it is serving request for 100
machines and Below is my hardware details.

Hardware Details

SUN BLADE 6000
2.67 GHz * 1
4 Gb RAM
2*146Gb HDD


 we intend to scale proxy servers with around  7000 to 1 users in
future.Just i want  to confirm whether the the above hardware is
sufficient enough to serve 1 users.If not please recommend me  the
server configuration i have to go for and also how to calculate the
same.

 And also to prevent  single point of failure is it possible to
configure squid in any load balancing mode (with another dedicated
server) if so just guide me  how to do the same or provide me the link
that best explains squid proxy server in load balancing mode.

 Anticipating your reply

Regards,

Craz paps
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Re: [CentOS] What ever happened to the dkms atheros drivers/

[Axel Thimm]

On Wed, Dec 03, 2008 at 06:09:56PM -0500, Robert Moskowitz wrote:
> > With  previous  kernels,  I had to use madwifi.
> 
> 
> Long back I used the kmod-madwifi patched kernel from atrpms, but then 
> we got a dkms loadable madwifi and no more kernel patches. DKMS is how I 
> am running my ipw3945 driver on this notebook.

Please note that

a) kmod is not the atrpms method of packaging kernel modules, kmdls is
b) kmdls involve no patching at all, the kmdl packages are just
   add-ons that you can drop into your running kernel.

In fact the end result of kmdls and dkms is not different, both offer
you an additional (set of) kernel module(s).
-- 
Axel.Thimm at ATrpms.net


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Re: [CentOS] squid server for 10,000 accounts

[Andy Loughran]

Howdy,

Regarding the Load Balancing, I find ipvsadm to be a very good package.

I'm not well-versed with squid, but for 10,000 users, I should image
that hardware is not sufficient (especially if they're all requesting
pages at the same time?)

My immediate hunch would be to set up a virtualised squid proxy, and
then copy that across to be hosted on multiple servers.  Providing it's
set up in a scalable fashion (maybe NFS share for config/rules) across
the entire cluster - you should be able to have a very scalable solution.

Regards,

Andy Loughran

linux-crazy wrote:
> Hi all,
>
>   I am running squid proxy server integrated with Content filter
> Dansguardian, squidguard  and clamav for Http level scanning on centos
> 5 .Configured webmin management tool  to create and manage access
> control using squidguard plug in. Now it is serving request for 100
> machines and Below is my hardware details.
>
> Hardware Details
>
> SUN BLADE 6000
> 2.67 GHz * 1
> 4 Gb RAM
> 2*146Gb HDD
>
>
>  we intend to scale proxy servers with around  7000 to 1 users in
> future.Just i want  to confirm whether the the above hardware is
> sufficient enough to serve 1 users.If not please recommend me  the
> server configuration i have to go for and also how to calculate the
> same.
>
>  And also to prevent  single point of failure is it possible to
> configure squid in any load balancing mode (with another dedicated
> server) if so just guide me  how to do the same or provide me the link
> that best explains squid proxy server in load balancing mode.
>
>  Anticipating your reply
>
> Regards,
>
> Craz paps
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>   

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Re: [CentOS] Adding RAM

[Kevin Krieser]

On Dec 6, 2008, at 10:44 AM, Ross Walker wrote:

>
> On Dec 5, 2008, at 7:18 PM, Rainer Duffner <[EMAIL PROTECTED]>
> wrote:
>
>>
>> Am 06.12.2008 um 01:02 schrieb Ignacio Vazquez-Abrams:
>>
>>> On Fri, 2008-12-05 at 23:57 +, Michael Holmes wrote:
 2008/12/5 Matt <[EMAIL PROTECTED]>:
> I have a server running Centos 4.7 32bit.  Will moving from 4Gig  
> of
> RAM to 8Gig do any good?  Since its 32bit I assume it will only be
> able to address the first 4Gig not?
 As long as you are using a SMP kernel you can use up to 64GB of RAM
 (though each proccess can only address 4GB of this). So if you can
 find any trace of  "SMP" in the uname (grep is your friend) then it
 should work fine.
>>>
>>> PAE, not SMP.
>>>
>>
>>
>> He should be able to replace the kernel via rpm -e and rpm -i
>>
>> That said, I doubt he'll actually see a benefit.
>> PAE is slow.
>> If you want to see a real performance-gain, install 5.2 x86-64.
>
> He'll see a benefit. PAE slowdown is humanly unnoticeable for short-
> term transactions, it's difference is in high nano seconds or low
> micro seconds.
>
> All 5.0 kernels are PAE by default.
>
> So are WinXP_SP2/Win2K3/Vista/Win2k8 and Mac OS X kernels.
>
> Only go 64-bit if it's completely necessary.


I see that I had mis remembered some changes in 5.

At least with regard to the upstream provider, on X86 the desktop  
version has a limit of 4GB of RAM, regardless of how much more memory  
you have.  And they removed the hugemem version, so instead of up to  
64GB of RAM on 32 bit, you can only get to 16GB for server versions.

I was combining the bunch, and thinking that you could now only get to  
4GB on 32 bit.

Of course, I believe that XP SP2 is now limited to 4GB of RAM on 32  
bit OS's, less when you factor in device space, due to problems with  
some device drivers.
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Re: [CentOS] squid server for 10,000 accounts

[Adam Tauno Williams]

> Regarding the Load Balancing, I find ipvsadm to be a very good package.
> I'm not well-versed with squid, but for 10,000 users, I should image
> that hardware is not sufficient (especially if they're all requesting
> pages at the same time?)
> My immediate hunch would be to set up a virtualised squid proxy, and
> then copy that across to be hosted on multiple servers.  Providing it's
> set up in a scalable fashion (maybe NFS share for config/rules) across
> the entire cluster - you should be able to have a very scalable solution.

Squid supports cache peering, cache hierarchies, and multicast ICP.  I'd
setup Squid peers.   



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Re: [CentOS] [OT] Firefox loses plugins, anyone else? Bug? Known?

[William L. Maltby]

On Sat, 2008-12-06 at 14:16 +0100, Matej Cepl wrote:
> On 2008-12-05, 23:48 GMT, William L. Maltby wrote:
> >> I was able to _start_ a comparison process, not completed yet. 
> 
> What is the output of the command
> 
> mozilla-plugin-config -l
> 

# mozilla-plugin-config -l
-bash: mozilla-plugin-config: command not found

Hmm... after an updatedb, did this

# locate mozilla-plug

No results.

> ? And if you have flash-plugin in ~/.mozilla then many bad things 

Looks like I'm OK there.

$ cd .mozilla;find . -iname '*plug*'
./firefox/9be8vroz.default/pluginreg.dat-
./firefox/9be8vroz.default/pluginreg.dat-2
./firefox/9be8vroz.default/pluginreg.dat

# locate flash-plugin
/home/hardtolove/Desktop/flash-plugin-9.0.124.0-release.i386.rpm
/usr/lib/flash-plugin
/usr/lib/flash-plugin/LICENSE
/usr/lib/flash-plugin/README
/usr/lib/flash-plugin/homecleanup
/usr/lib/flash-plugin/libflashplayer.so
/usr/lib/flash-plugin/setup
/usr/share/doc/flash-plugin-10.0.12.36
/usr/share/doc/flash-plugin-10.0.12.36/readme.txt

This is the one from the adobe site.

# rpm -qv flash-plugin
flash-plugin-10.0.12.36-release


> will happen to you. Remove it and install the one from Adobe yum 
> repo together with nspluginwrapper from CentOS repos.

Did it.

# rpm -q nspluginwrapper
nspluginwrapper-0.9.91.5-22.el5

However, when I restart FF, this plugin does _not_ appear in the
tools->add-ons plugins tab window. Should it? The pluginreg.dat seems to
have been updated and the nspluginwrapper is in there.

]$ cd .mozilla
[EMAIL PROTECTED] .mozilla]$ find . -iname '*plug*' -ls
16285943   12 -rw---   1 hardtolove hardtolove 5267 Nov 20
19:55 ./firefox/9be8vroz.default/pluginreg.dat-
162885268 -rw---   1 hardtolove hardtolove   65 Dec  5
17:37 ./firefox/9be8vroz.default/pluginreg.dat-2
16288502   12 -rw---   1 hardtolove hardtolove 5859 Dec  6
14:32 ./firefox/9be8vroz.default/pluginreg.dat
[EMAIL PROTECTED] .mozilla]$ date
Sat Dec  6 14:44:38 EST 2008

$ grep nsplug ./firefox/9be8vroz.default/pluginreg.dat
/usr/lib/nspluginwrapper/npwrapper.so:$
http://gwenole.beauchesne.info/projects/nspluginwrapper/";>nspluginwrapper
  is a cross-platform NPAPI plugin viewer, in particular for linux/i386 
plugins.This is beta software available under the terms of the GNU 
General Public License.:$

> 
> Does it help?

Might be hard to tell since the behavior is inconsistent. But everything
is now set the way "we" think it should be.

> 
> Matěj

Since missing stuff reappeared during testing, I guess there will be a
delay while I see if the behavior occurs again.

I'll keep this post and post either when it happens again or after a few
days if it doesn't happen again.

> 

Thanks for all the help,

-- 
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Re: [CentOS] [OT] Firefox loses plugins, anyone else? Bug? Known?

[William L. Maltby]

On Sat, 2008-12-06 at 09:56 -0500, "Germán Andrés Pulido F." wrote:
> I have seen this exact same behavior under Fedora 9. it seems the bug is 
> with firefox for some reason. It will happens when clicking over a link 
> opens firefox. If firefox is already open, it works OK. I've found no 
> solution yet, other than switching to opera for my browsing needs. I 
> have the tabmixplus extension, I thought it was related. Do you have 
> this extension?

I don't show any extensions at all. I tend to keep relatively "pure"
setups.

> 
> Regards.
> 

-- 
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Re: [CentOS] squid server for 10,000 accounts

[NiftyClusters T Mitchell]

On Sat, Dec 6, 2008 at 11:38 AM, Adam Tauno Williams
<[EMAIL PROTECTED]> wrote:
>> Regarding the Load Balancing, I find ipvsadm to be a very good package.
>> I'm not well-versed with squid, but for 10,000 users, I should image
>> that hardware is not sufficient (especially if they're all requesting
>> pages at the same time?)
>> My immediate hunch would be to set up a virtualised squid proxy, and
>> then copy that across to be hosted on multiple servers.  Providing it's
>> set up in a scalable fashion (maybe NFS share for config/rules) across
>> the entire cluster - you should be able to have a very scalable solution.
>
> Squid supports cache peering, cache hierarchies, and multicast ICP.  I'd
> setup Squid peers.
>
> 
>
>

Exactly... and it is possible to have a 'URL' as your proxy.  It can contain
hints and be dynamic over time making it "easy" to update the proxy environment.
and you have a single instruction for all your 1 users.   While
some stuff can
be done with DHCP, the URL trick is powerful and sets a stage such
that the squid
admin folk do not need  to touch a complex DHCP setup.


-- 
NiftyCluster
T o m   M i t c h e l l
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