Discuss February 2011

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SSH AllowUser WildCard
by Stephen Cox 08 Feb '11

08 Feb '11

Is it possible to allow a user to login from an changing hostname like: username(a)*hoststringfixed.com -- Stephen Cox

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How and when are the sound modules loaded at system boot time on CentOS 5?
by James Pearson 08 Feb '11

08 Feb '11

I've been trying to work out how the various sound modules get loaded at boot time on CentOS 5 - but I can't find anything obvious under /etc/rc.d/ CentOS 4 did this in /etc/rc.d/rc.sysinit - but there is nothing equivalent in CentOS 5 Does anyone know how these modules get loaded? Thanks James Pearson

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premature question on 5.6
by Jerry Geis 08 Feb '11

08 Feb '11

What will be the correct way to migrate ext3 to ext4 going from 5.5 to 5.6? Will something after the update ask if you want to migrate the file systems? Looking forward to some file system speed ups with large files. Thanks Jerry

6 5

Is there a Centos 3 around ?
by Nicolas Ross 08 Feb '11

08 Feb '11

Hi ! I think one of my machine got hacked, but I can figure out from where... I found some suspicious file in /bin and /usr/bin directories that are owned by user id 122, where this machine doesn't a userid 122. So, does anyone hav a centos 3.9 install arround that can send me the info about (filesize, md5, modification date) these file : /bin : ls netstat ps /usr/bin/ dir find md5sum pstree slocate tee top What tiped me off, I was sudoing to another user, and swas this message : "Unknown HZ value! (92) Assume 100." Thanks

9 12

RHEL 6 <-> CentOS 6 ?
by Nicolas Ross 07 Feb '11

07 Feb '11

Hi ! We are curently deploying an 8 nodes cluster where we have a RHEL 6 license at great costs (~14 k$/y). It will be our new production environment for mission-critical services. Now our aging developpement server (old p4 with 1.5 gig of ram) need to be updated. We will be installing on hardware as close as possible to the new production servers, just not in a rack... For the developement server, I won't be needing the RH support (and price that goes with it). So I wsish to install it under CentOS. But 6 isn't out yet. (by the way, when ;-) ?). I do have a spare slot in my rhn that I can install the new server with. Will RHEL 6 be as easy to switch to CentOS 6 as were RHEL/CentOS 5 ? That is install a couple of rpms, yum update and voilà ? Thanks,

3 3

Re: [CentOS] Fan speed control on Supermicro X8DAL board with CentOS
by Chuck Munro 07 Feb '11

07 Feb '11

On Sun, 06 Feb 2011 12:09:12 +0000 Ned Slider wrote: > > On 06/02/11 07:00, Chuck Munro wrote: >> > Hello folks, >> > >> > I'm having a difficult time trying to figure out why the CPU cooling >> > fans run at full speed on my Supermicro X8DAL-3 motherboard. There >> > doesn't seem to be any variable speed (the fans are PWM compatible) ... >> > they either idle at almost nothing, or suddenly burst into a >> > high-pitched scream that gets my ears bleeding after a few seconds. >> > Once they jump to warp-10, they remain there. >> > >> > The "Super-I/O" chip on this board is a Winbond W83627DHG which does the >> > temperature and voltage monitoring. >> > >> > Is anyone aware of which driver or kernel module I need for that chip in >> > order to get control of the fans? The Supermicro web site and the >> > board's manual aren't any help. Fresh installs of CentOS-5.5 and RHEL-6 >> > don't exert any control by default. Installing the lm_sensors package >> > and probing with the 'sensors' command didn't help either. >> > >> > Slowly going deaf ....... >> > >> > Chuck > > Hi Chuck, > > The correct kernel module for your chipset is w83627ehf.ko. I'm not sure > the driver actually controls fan speed, I thought it was more for > monitoring (fan speeds, temps, voltages) but I could be wrong. My > current system (not a Supermicro) controls variable fan speed from > options within the BIOS. I can enable/disable fan speed control and > select either voltage or PWM based control. > > The stock w83627ehf driver in RHEL5.5 is oldish (they were updated in > 5.5 I think but are still over a year old now). ELRepo.org have an > updated driver available (kmod-w83627ehf) based on a backport from > kernel-2.6.34. I've just checked upstream and a few more patches have > been committed since kernel-2.6.34 and the current kernel-2.6.37 so I'll > look at updating the elrepo driver with those latest patches. > > Hope that helps. > > Thanks Ned! I did go through the board's BIOS menus several times and could find only one fan control option, which ranges from always-fast for maximum performance to almost-silent for workstation use. No matter what the setting, the fans may start out slow but eventually jump to high speed. Updating the BIOS to the latest version made no difference. I also noticed that at all times the BIOS reports the CPU temperatures as "Low" no matter what the fan speed. The coolers are always cold to the touch. I sure hope I don't have a defective board ... it's a royal pain to have to remove one from a large server. I booted Ubuntu but the live-CD version doesn't have a working 'fancontrol' utility. I'd be tempted to install Ubuntu Server but I much prefer staying with CentOS and KVM to match all of the guest virtual machines it'll be running. Time to go through the mobo manual with a fine-tooth comb. :-) Chuck

3 2

Autorun is VERY bad
by kellyremo 07 Feb '11

07 Feb '11

How to disable autorun? Are there any hidden autorun features on a standard CentOS install?? http://securitytube.net/USB-Autorun-attacks-against-Linux-at-Shmoocon-2011-…

3 3

system clock
by Buz Davis 07 Feb '11

07 Feb '11

I am running CntOS 5 with Gnome. Every now and then I have noticed that the computer will somehow get the time wrong by several hours. Is there a simple way to adjust the time? So far the only way I have found is to boot into windows (it is a dual boot system), make the change there, and then get back into CentOS. Older versions of Red Hat and Fedora let you do it by right-clicking on the time display, if I recall correctly, but setting the time isn't one of the options in CentOS. Thanks Buz Davis

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RHEL/Centos6 handling disks w/4k sectors?
by Les Mikesell 07 Feb '11

07 Feb '11

Does anyone know if 4k sectors will be handled better by the kernel in Centos6? I'd like to copy backups to a 750Gb laptop type drive for offsite storage but the best write speed I can get is about 8MB/sec even with dd to the raw disk which shouldn't have an issue with partition alignment. -- Les Mikesell lesmikesell(a)gmail.com

6 6

selenium rc server - run it on a specific display help!
by Roland RoLaNd 07 Feb '11

07 Feb '11

Dear all, i'm trying to run multiple selenium rc server on a centos box (different ports) with developers connecting to it through VNC (different respective ports) to check their automated test result. i can easily do the above manually (when it comes to running RC server). though automating the process is proving to be difficult. can anyone guide me on how to run a service on a specific display in an automated process? right now if i connect to a vnc session (any port) and i run it manually through iterm, it works normally. though setting an cron job that does the above, isnt working (rc opens in shell instead of on each dev's assigned display)

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Discuss February 2011