Discuss January 2010

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Centos v3.3 CD 2
by Luis-Miguel Astudillo 15 Nov '11

15 Nov '11

Sorry, I have been away for a while. has anyone fixed CD2 fotr CentOS v3.3 ? -- Luis

6 7

Lingering dhclient issue
by Alfred von Campe 22 Jun '11

22 Jun '11

I recently reconfigured some CentOS 4.3 systems that were using DHCP to use static IP addresses. At the same time, the systems were moved to a new VLAN. Here is the approximate sequence of events that took place: 1. ifdown eth0 2. edit /etc/sysconfig/network-scripts/ifcfg-eth0 with static IP address 3. wait for network folks to reconfigure switch 4. ifup eth0 I may have reversed steps 1 and 2 on some of the systems. The problem was that the dhclient process didn't go away, and kept renewing the old lease. Our DHCP server is configured to contact the DNS server and update the entry for each host it serves. So the DNS entries for these systems were pointing to the old address in the old VLAN. The eth0 interface itself just kept the static IP address for which it was configured. It took me a while to figure out what was going on. My question is, what could I have done to avoid this (other than killing the dhclient process)? Is there a better way to reconfigure an interface to use a static address? I am not interested in solutions that involve using a GUI (i.e., only command line solutions). Thanks, Alfred

9 17

what pkg contains libstdc++-libc6.2-2.so.3
by Fong Vang 02 Feb '11

02 Feb '11

In CentOS 4.1/2, what package contains this library: libstdc++-libc6.2-2.so.3? I installed a couple of the compat- packages, but this library is still missing.

8 8

Monitor Network Traffic
by sadas sadas 11 Jun '10

11 Jun '10

What is the best way to monitor the total incoming / outcoming network traffic of CentOS server. I think that the solution is to monitor the network interfaces and to send SNMP packets to remote server. But is it possible? regards

6 8

Shutdown/poweroff does not power off machine
by Scot P. Floess 02 Jun '10

02 Jun '10

I've got a Dell Optiplex GX240 I am running CentOS 5.4 (kernel 2.6.18-164.9.1.el5.centos.plus)... When I had Fedora 11 and 12 on it, I could issue a poweroff command and the machine would power itself off. However, under CentOS it doesn't turn the machine off whatsoever. When it completes, the machine is still running with a message of "system halted." Then I have to physically hit the power button to turn it off... I believe at some point I did try to issue a shutdown command - but had the same results... Anyone have any recommendations or suggestions? Thanks ahead of time :) Scot P. Floess 27 Lake Royale Louisburg, NC 27549 252-478-8087 (Home) 919-890-8117 (Work) Chief Architect JPlate http://sourceforge.net/projects/jplate Chief Architect JavaPIM http://sourceforge.net/projects/javapim Architect Keros http://sourceforge.net/projects/keros

6 15

Bug in freeradius 1.1.3-1.5.el5_4 rpm
by Ian Forde 22 May '10

22 May '10

I upgraded one of my servers to CentOS 5.4 today. The freeradius service (radiusd) didn't start up due to permissions errors. I tracked it to the permissions on the /etc/raddb/certs/ directory being set to 640 rather than 750, so the radius user couldn't enter the directory. In the spec file from the source rpm, line 200 should read: %attr(750,root,radiusd) %config (noreplace) /etc/raddb/certs rather than the current: %attr(640,root,radiusd) %config (noreplace) /etc/raddb/certs Note that this bug also exists in the the 1.1.3-1.4.el5 version that's part of the CentOS 5.4 release. I'm not sure if it exists upstream though, but there it is... ;) -I

3 3

Centos-release srpm
by Tom Diehl 22 Apr '10

22 Apr '10

Hi, Does anyone know where I can get centos-release-5-4.el5.centos.1.src.rpm? I have looked on several mirrors and that one seems to be MIA. Even Google does not seem to know where it is. I need it so I can rebuild it with my local yum repos in it. Regards, -- Tom Diehl tdiehl(a)rogueind.com Spamtrap address mtd123(a)rogueind.com

4 7

No ulimit for user
by Stephen Nelson-Smith 08 Apr '10

08 Apr '10

Hi, I'm trying to remove any limit on open files for a user; I've set username nofiles to unlimited in /etc/security/logins.conf, but now I get "could not open session" if I try to su to the user. singhh - nofile unlimited I think this is related to PAM, so I've modifed /etc/pam.d/su and /etc/pam.d/login to use pam_limits.so: # cat /etc/pam.d/su #%PAM-1.0 auth sufficient pam_rootok.so # Uncomment the following line to implicitly trust users in the "wheel" group. #auth sufficient pam_wheel.so trust use_uid # Uncomment the following line to require a user to be in the "wheel" group. #auth required pam_wheel.so use_uid auth include system-auth account sufficient pam_succeed_if.so uid = 0 use_uid quiet account include system-auth password include system-auth session required pam_limits.so session include system-auth session optional pam_xauth.so # cat /etc/pam.d/login #%PAM-1.0 auth [user_unknown=ignore success=ok ignore=ignore default=bad] pam_securetty.so auth include system-auth account required pam_nologin.so account include system-auth password include system-auth # pam_selinux.so close should be the first session rule session required pam_selinux.so close session include system-auth session required pam_loginuid.so session optional pam_console.so # pam_selinux.so open should only be followed by sessions to be executed in the user context session required pam_selinux.so pam_limits.so open session optional pam_keyinit.so force revoke What am I doing wrong? S.

4 6

openfiler (was: using CentOS as an iSCSI server?)
by Alan McKay 07 Apr '10

07 Apr '10

> Simple, it's only a NAS device, and not really a file server / web > server / data base server as well. Here is something I am currently lokoing at, and wondering if you'd considered it or if anyone here has done it. I've got a bunch of existing hardware - really good IBM stuff that is all installed with CentOS (with a few exceptions). We want to move to virtualization, but the direct-attached storage is a bit of an issue because with VMWare ESXi you cannot do some of the fancy stuff like "VMove" (moving a live running server from one host to another). So of course Openfiler comes to mine. However, most of this hardware has pretty significant CPU and RAM horsepower, so just running it as openfiler would be quite wasteful. What I se some people doing is - install ESXi (4.0) onto the bare metal - install openfiler as a virtual machine - give open filer all the disk - serve the disk out to other VMs via openfiler This may seem redundant vs just doing it without openfiler, but as mentioned a lot of the fancy features you only get with virtualized disk. I am about to do some benchmarks on this stuff to see what percentage of performance I give up for doing it this way. -- “Don't eat anything you've ever seen advertised on TV” - Michael Pollan, author of "In Defense of Food"

9 22

Don't forget to use torrents for your downloads!
by William L. Maltby 23 Feb '10

23 Feb '10

For those who may forget, usin torrents to download and share the new images will get you faster downloads (if enough folks participate) if you have a "fat" pipe and alleviate the load on the CentOS servers. I have a "chubby" pipe (~ 1.2MB/sec) and got the stuff really quickly earlier today. If your torrent has distributed hash table capability, I suggest that you also use that feature. Happy sharing! -- Bill

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Discuss January 2010