[CentOS] centos.plus kernels

[Alain Terriault]

hi,

I experienced 3 problems that i am 99% sure related to 
kernel-2.6.18-92.1.22.el5.centos.plus.x86_64.rpm 


#1 on a nfs server
problem : constantly appearing on all my machines "lockd: server 192.168.10.2 
not responding, 
timed out"

solution : move to kernel-2.6.18-92.1.22.el5, never saw that message again. 

#2 on the same nfs server
problem : it is a important server for our department, so i rarely do a 
"shutdown". 
when i moved to kernel-2.6.18-92.1.22.el5 the "/sbin/shutdown -h now" did not 
succeed, i had to press the power button to shut it down.
the only thing that was on the screen, after 10 minutes, was a usb messages, i 
could unplug my usb keyboard and the kernel would notify
me of the changes, it seem that it was not totally frozen. 
everything boot up properly, after the power cycle, so i assume all the files 
where close properly.
i only had this problem on this nfs server, other machines with the same kernel 
never had this shutdown problem.

solution : move to kernel-2.6.18-92.1.22.el5, did power cycle test and all went 
just fine. 


#3 on a vmware virtual machine
problem :
Feb 15 18:55:41 www kernel: nscd[5631]: segfault at 2b89938405c0 rip 
2b891f30f7c5 rsp  411256d0 error 4
Feb 16 14:39:40 www nscd: 5642 invalid persistent database file 
"/var/db/nscd/passwd": verification failed
Feb 16 17:11:53 www kernel: nscd[5653]: segfault at 40f9b000 rip 
2af497e3e4d4 rsp  40f96050 error 6
Feb 17 09:44:37 www nscd: 5639 invalid persistent database file 
"/var/db/nscd/hosts": verification failed
Feb 19 03:09:09 www kernel: nscd[5830]: segfault at 2baab9b653cc rip 
2ba9afe3b7a6 rsp  41ec96d0 error 4

for ldap accounts login was still possible, some of the directories became 
unaccessible and other directories where working just fine. 

rebooting nscd temporary fixed the problem for ~12-24 hours, same for a system 
reboot.
i did not push my investigation further, after my problems with nfs lock i 
instantly switch to kernel-2.6.18-92.1.22.el5


solution : move to kernel-2.6.18-92.1.22.el5, never saw that message again.


I did not take that many notes or investigate that much, so i can not tell you 
much more. but i will do my best to reply to direct emails.
I am also not in a position to reproduce those problems.
I sent this post because i am concern they may be serious bugs in the 
centos.plus kernels. 

other than that, i am old centos fan, using it on terabytes of data and this is 
the first time i hit such a problem.

cheers,
alain



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Re: [CentOS] Is the NFS lockd bug fixed ? (update)

[Alain Terriault]

Filipe Brandenburger wrote:
> Do you mean you replaced the CentOS-Plus kernel with a kernel from RedHat?
>   
no
> Or are you using a CentOS-Base (instead of Plus) kernel now?
>   
yes .. apologies for the confusion
> When you replaced it, did you upgrade it as well? What was the version
> of the -Plus kernel you were using? And what is the version of the
> -Base or RHEL kernel you are using now?
>   
problematic setup :
nfs server was running 2.6.18-92.1.22.el5.centos.plus
clients where running   2.6.18-92.1.22.el5.x86_64

healty setup :
nfs server is running 2.6.18-92.1.22.el5.x86_64 + kmod-xfs-0.4-2
clients are still on  2.6.18-92.1.22.el5.x86_64


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[CentOS] Is the NFS lockd bug fixed ? (update)

[Alain Terriault]

removing all my centos+ kernels and using kmod on top of redhat kernels 
fix my nfs lock problem.
thanks,
alain

Akemi Yagi wrote:
> On Tue, Feb 17, 2009 at 7:57 AM, Filipe Brandenburger
>  wrote:
>   
>> Hi,
>>
>> On Tue, Feb 17, 2009 at 10:44, Alain Terriault  
>> wrote:
>> 
>>> I am runing x86_64 versions of "kernel-2.6.18-92.1.22.el5.centos.plus" (
>>> i need XFS)
>>>   
>> You no longer need CentOS Plus kernel for XFS.
>>
>> See:
>> http://wiki.centos.org/AdditionalResources/Repositories/CentOSPlus#line-76
>> 
>
> And even this info is becoming obsolete.  The current kmod-xfs package
> (in CentOS-5) is kABI-tracking, that is, it is independent of the
> kernel version.
>
> Akemi
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>   


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[CentOS] Is the NFS lockd bug fixed ?

[Alain Terriault]

Hi,

I notice other users reporting problems with NFS lockd and was under the 
impression the problem was solve with "kernel-2.6.18-92.1.13.el5".

I am runing x86_64 versions of "kernel-2.6.18-92.1.22.el5.centos.plus" ( 
i need XFS) on my nfs server and "kernel 2.6.18-92.1.22.el5" on my clients.

I constantly get this error "lockd: server 192.168.10.2 not responding, 
timed out"

Does the most recent "centos_x64" kernel has the lockd patch ?
maybe my problem is elsewhere, I never had problem with NFS before ..

thanks,
alain


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Re: [CentOS] 5.1 to 5.2 upgrade - perfectly smoothe

[Alain Terriault]

the only problem I had was with ldap.
the fix is at http://people.centos.org/hughesjr/nss_ldap/5/x86_64/

without this update, I am not sure anyone can have a stable 5.2 on ldap

it all my problems with Mailscanner (email), perl and webmin

thanks,




Tim Alberts wrote:
I run 3 servers and I upgraded them from 5.1 to 5.2 this week without 
even a single glitch.  So now that I've been running CentOS for a couple 
months, I wanted to take a minute to say...


Thank you to CentOS, everyone on the list for the occasional technical 
support (and thanks to the upstream vendor).


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--
This message has been scanned for viruses and
dangerous content by MailScanner, and is
believed to be clean.

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RE: [Fwd: Re: [CentOS] School Server Setup]

[Alain Terriault, Mr.]

Little substance .. I have live and still working system with .. 

- Centos with +100 users, ldap (LAM), sendmail (or postfix), web, samba,
netatalk, dhcp .. all with certificates on a bunch of dell 1950 and
MD1000. Because it is scalable, stable 24/7 and for 100 users+ worth all
the time spending configuring it. The only problem with this setup are
kernel updates.. the only time I bring down the servers ;-)

- Clarkconnect (or SME) for small lab, because it is all done in 30
minutes and then you can easily give a "miniadmin" access to the lab
manager. They make nice, small, safe effective Gateway or server. 
They are not a sysadmin (shell) playing ground, 95% of the work is done
from the web interface, a little bit like webmin. Clark is commercial
but inexpensive and well supported. SME is free, but the config system
looks to much like the old Netinfo system from NextStep .. bring back
bad memory.

Try Clark, if it not what you are looking for, go with CentOS or RH they
are very stable and effective OS for server. It will require you more
time to get it all working properly. 
Sure you can install and create accounts in /etc/passwd in minutes ..
but if you want all the goodies and security (SSL, email, sasl, LDAP,
backup, raid ..) you are in for lots of fun (work).

- Workstations, Fedora or Ubuntu .. because I like having the most
up2date versions and goodies on my desktop for free. 

RedHat has nice educational discount, if I remember $50/workstation and
$200/server

Bonne chance,
alain





> -Original Message-
> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
> Behalf Of Ralph Angenendt
> Sent: Wednesday, June 11, 2008 10:08 AM
> To: centos@centos.org
> Subject: Re: [Fwd: Re: [CentOS] School Server Setup]
> 
> Your case up there looks a bit different: It is easy to say that those
> are your favourite flavors - but can you substantiate that somehow?
> Especially as ClarkConnect and SME are based (or at least were based)
> on CentOS but mostly lack a large community behind them -> Vendor
Lock-
> In.
> 
> Ralph
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[Fwd: Re: [CentOS] School Server Setup]

[Alain Terriault]

Hi Harry,

Has much has I like Centos and RH for big sophisticated setup, it would 
not be my first choice for your project.


For 25 systems and if you want this done without spending to much time, 
Clarkconnect would by my first choice for server side OS (#2 would be SME).


For me CentOS x64 is #1 choice for enterprise (+500 users with Terabytes 
of storage ) sever solution.
If you have little experience configuring a RH server, get ready to 
spend lots of time getting everything going as nicely as Clarkconnect 
does it.


For the clients side, my favorite flavor of Linux is Ubuntu.

cheers,
alain

Harry Sukumar wrote:


Hello All!!!

I was wondering if you can help me little bit….

I am trying to help (voluntary service) a country side school 
(Aboriginal community) in Northern Queensland Australia setup lab 
infrastructure, it’s a very remote school and they don’t have enough 
funds to go commercial


The school has only till grade 6

They have 25 machines that was bought out of the government grant but 
none of the machines come with windows


I was asked by the school president to setup lab infrastructure 
currently they have Internet (Dynamic) with only two machines connected


I have asked them to change the plan to Static IP address which I 
presume will be done some time this week


I have decided to go Linux on all the machines including the server

Could some one please cast some light on how I can carry on with this 
project, I am not sure where to start and I am fairly new to Linux and 
system administration world


Currently what’s in my mind is to setup fedora on all desktop and 
CentOS5 as my server with following services configured


Proxy-squid (all the traffic to pass through)

Firewall

Apache

Squirrel mail

DNS

DHCP

I am not sure where to start with this project

Your help will be highly appreciated by the little kids who have never 
even touched a computer before in there life!!!


--

Many Thanks

Harry



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Re: [CentOS] Chroot'ed SSH

[Alain Terriault]

easy way to get sshd ver.5 installed on centos5
http://fs12.vsb.cz/hrb33/el5/hrb-ssh/stable/SRPMS/
rpmbuild --rebuild openssh-5.0p1-1.el5.hrb.src.rpm
worked for me .. but honestly, has excited has I was, I do not find 
chroot to be that useful .. if I remember correctly, the chroot 
directory has to be owned by root and was not possible with my setup.


alternative
"scponly" from from the EPEL Repositories 
(http://download.fedora.redhat.com/pub/epel/5/x86_64/)

will give your users secure file transfers access without a terminal

my favorite
"rssh" rssh is a restricted shell for use with OpenSSH, allowing only 
scp and/or sftp. For example, if you have a server which you only want 
to allow users to copy files off of via scp, without providing shell 
access, you can use rssh to do that.


hope this help
alain

Filipe Brandenburger wrote:

Hi,

Is anyone chrooting users that connect through SSH?

I looked for it on Google and I basically saw several methods:
- OpenSSH 5 supports ChrootDirectory (FC9 apparently has RPMs that
probably could be rebuilt under CentOS 5)
- There seem to be several patches for OpenSSH 4.x to do the chroot,
the most popular seems to be http://chrootssh.sf.net/
- There appears to be a pam_chroot
- There are solutions based on setting the user's shell to a
script/binary that does the chroot

By quickly looking at yum list, it doesn't seem like neither RHEL nor
CentOS directly support any of those, at least I didn't find any RPMs
for any of those.

If anyone is doing it, I would like to know what were your experiences
and if you would recommend doing it or not.

I'm specially interested in anything that doesn't involve replacing
the OpenSSH that comes with CentOS, after all, that's what CentOS is
all about, if you start replacing the pieces, what's the point...

Thanks a lot!
Filipe
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RE: [CentOS] sendmail and spam .. thanks

[Alain Terriault, Mr.]

Thanks, This is a very useful mailing list and CentOS works like charm
on PowerEdge hardware.
Merci, alain

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[CentOS] sendmail and spam

[Alain Terriault]

Hi,

What is todays most effective combination to filter spam ?

On my old Redhat 3 system I used Sendmail and Spamassasin .. it was
good, but with the current setup we are getting way to much spam.

Looking around I found new players, well some I did not know then and
they are very interesting..

MailScanner .. http://www.mailscanner.info/
Sagator .. http://www.salstar.sk/sagator/
Smf .. http://smfs.sourceforge.net/index.html
dspam .. http://dspam.nuclearelephant.com/index.shtml

I am tempted to go with smfs because it is familiar .. but, mailscanner
seems popular

thanks,
alain

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Re: [CentOS] RE: Largish filesystems [was Re: XFS install issue]

[Alain Terriault]

Just wondering if any one ever consider/use Coraid for massive storage 
under CentOS?

http://www.coraid.com
It seems like a very reasonable option.. comments ?

I$ilon could also be a option for petabytes storage
http://www.isilon.com/products/index.php



[EMAIL PROTECTED] wrote:

To start I wish to that you for the swift response on this
issue. I do not think that I would get such a quick
response from a proprietary (closed-source) company. Open
Source :-).

To respond to one the comments about large file systems
“recommend you split it in several smaller (2-4TB)
filesystems “
This is not feasible in many situations. In some
situations 2-4TB is not even a reasonable starting point.

A little background.
I have been using RH from v2 to v9. and in v9 I did get an
install ISO of RH9 that included XFS support. Way back
then I used it on a 1.4TB PATA hardware raid 5 (A lot of
disk for it time). The system is still operational with
out any FS issues short of failed drives. Fixed with the
hot spares on the system. in five years of operation the
system has had one outage a maintenance reboot Less then
2min down). After RH9 I switched to Centos.

The system that I am currently configuring with 7+ TB of
storage is one of the smaller storage servers for our
systems. Using the same configuration with more drives we
are planning several 20TB+ systems.

For the work we do a single file system over 100TB is not
unreasonable. We will be replacing a 80TB SAN system based
on StorNext with a Isilon system with 10G network
connections.

If there was a way to create a Linux (Centos) 100TB –
500TB or larger clustered file system with the nodes
connected via infiniband that was easily manageable with
throughput that can support multiple 10Gbps Ethernet
connections I would be very interested.

And once more thanks for the fast response.

Mike
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[CentOS] XFS + LVM

[Alain Terriault, Mr.]

Hi,

I see old post on the web discouraging the use of XFS on top of LVM,
mostly seems to be driver problems .. in any case it was not reassuring.

I was wondering, with current drivers and kernels (CentOS5), if they are
any issue doing so.

I have no real need for LVM, I am just use to it and occasionally found
it useful.

It is my first time building a 12T partition and for my usage I think
XFS seems to be the way to go.
It will mostly be use for uncompress audio storage.

Any comments will be more than welcome,

cheers,
alain

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[CentOS] openssh version 5

[Alain Terriault, Mr.]

Greetings,

It just strike me that they are no available version of OpenSSH version
5 or any available versions with the ChrootDirectory option.

Any reason why ?


Thanks,






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