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Emergency help needed on host network randomly stop working.
by Magicloud Magiclouds 12 Oct '11

12 Oct '11

Hi, This is a Centos 5.5 host with one xen guest. About 2 weeks ago, the host randomly lost network connection. By this I mean I could not connect to the services on it, or ping it. Also was the status of the guest. From serial console, I connected to the host, trying to see what happened. No clue (any error messages) in messages or dmesg. ifdown/ifup the interface did not help, either. Only rebooting was my only choice. Searching through Google, I got the information that some other guys met similar problem, and resolved by setting stp on with the bridge interface. I set it, too. And the problem still occurs. Any idea what I should check now? Thanks. -- 竹密岂妨流水过山高哪阻野云飞

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Mock - Problems building Centos5 package on Centos6 - where can I ask for advice ?
by Morgan Cox 12 Oct '11

12 Oct '11

Hi. I am trying to use Mock to rebuild a .src.rpm file I have made for PHP 5.3.8 (for Centos6) I have managed to install deps fine with mock. When I try to rebuild the package though I get. (from build.log) --------------------------------------------------------------------------------------------------------- + cat /usr/share/aclocal/libtool.m4 /usr/share/aclocal/ltoptions.m4 /usr/share/aclocal/ltsugar.m4 /usr/share/aclocal/ltversion.m4 /usr/share/aclocal/lt~obsolete.m4 cat: /usr/share/aclocal/ltoptions.m4: No such file or directory cat: /usr/share/aclocal/ltsugar.m4: No such file or directory cat: /usr/share/aclocal/ltversion.m4: No such file or directory cat: /usr/share/aclocal/lt~obsolete.m4: No such file or directory RPM build errors: error: Bad exit status from /var/tmp/rpm-tmp.90639 (%build) Bad exit status from /var/tmp/rpm-tmp.90639 (%build) Child returncode was: 1 EXCEPTION: Command failed. See logs for output. # ['bash', '--login', '-c', 'rpmbuild -bb --target x86_64 --nodeps builddir/build/SPECS/php.spec'] Traceback (most recent call last): File "/usr/lib/python2.6/site-packages/mock/trace_decorator.py", line 70, in trace result = func(*args, **kw) File "/usr/lib/python2.6/site-packages/mock/util.py", line 328, in do raise mock.exception.Error, ("Command failed. See logs for output.\n # %s" % (command,), child.returncode) Error: Command failed. See logs for output. # ['bash', '--login', '-c', 'rpmbuild -bb --target x86_64 --nodeps builddir/build/SPECS/php.spec'] LEAVE do --> EXCEPTION RAISED --------------------------------------------------------------------------------------------------------- (I can post the full build.log if needed) If this is not the correct place to ask about this can someone point me where I can ask ? Many regards

4 8

Inbuilt Bisoncam NB Pro webcam is not detected in CentOS 6
by balajisundar 12 Oct '11

12 Oct '11

Sir, Recently i have buy a HCL ME Laptop with inbuilt webcam support. I have installed the CentOS 6 and its not detected the Bisoncam NB Pro webcam. Is there any driver is required, if its required please send me the driver download link and installation steps. Regards -S.Balaji

3 6

yum update
by Damas Ally 12 Oct '11

12 Oct '11

Greetings, Can anyone help me on how to fix this problem? when i run yum update from CLI i got this one [root@ict ~]# yum update Loaded plugins: fastestmirror Loading mirror speeds from cached hostfile * base: sunsite.rediris.es * extras: sunsite.rediris.es * updates: sunsite.rediris.es .... .... ... .. ---> Package python-libs.x86_64 0:2.4.3-44.el5_7.1 set to be updated http://mirror.centos.org/centos/5/addons/x86_64/repodata/filelists.xml.gz: [Errno 4] IOError: <urlopen error (-3, 'Temporary failure in name resolution')> Trying other mirror. Error: failure: repodata/filelists.xml.gz from addons: [Errno 256] No more mirrors to try. You could try using --skip-broken to work around the problem You could try running: package-cleanup --problems package-cleanup --dupes rpm -Va --nofiles --nodigest >From there i tried those options but still i cant update. Centos 5.5 thanks -- "If opportunity doesn't knock, build a door". Says, Makweba Sir

4 8

Odd issue with C6 and NIS
by James A. Peltier 11 Oct '11

11 Oct '11

I seem to have this very odd issue with CentOS 6 WRT NIS. I have taken the package selection that I used with CentOS 5 and basically plopped it into my C6 kickstart file (see below). On C5 this works just fine and I'm able to log in with NIS credentials just fine. However, it looks like on C6 if you use a package selection like this, you also need to specify the yp-tools package as part of the kickstart *even though* you specify an authentication method of NIS in the kickstart. Seems like a bug to me?!? auth --useshadow --enablemd5 --enablenis --nisdomain test --nisserver yp.example.com %packages @core augeas autofs dstat nfs-utils ntp openssh openssh-clients openssh-server portreserve puppet redhat-lsb rsh-server sendmail sendmail-cf sudo sysstat tcp_wrappers wget xinetd yum-utils %end -- James A. Peltier IT Services - Research Computing Group Simon Fraser University - Burnaby Campus Phone : 778-782-6573 Fax : 778-782-3045 E-Mail : jpeltier(a)sfu.ca Website : http://www.sfu.ca/itservices http://blogs.sfu.ca/people/jpeltier I will do the best I can with the talent I have

12 39

Deciding when to do system encryption
by Bade Iriabho 11 Oct '11

11 Oct '11

Hello All, I have read that system encryption slows a computer down. However, I am more interested in when to use it. Consider the following scenarios: 1. You have a server in a secured server room on a rack (is there any need and advantage to having system encryption in this particular case) 2. you have a server sitting in an office that is accessible by everyone 2. You have a desktop 3. You have a laptop So my questions are: What situations/scenarios do you consider before implementing system encryption? I guess at the end of the day, I am trying to figure out the best practices. Regards, B.I.

5 6

CentOS 6 is a bear
by Bob Hoffman 11 Oct '11

11 Oct '11

Gotta say, centos has been tough to install and get working. The anaconda installer makes large drive setups horridly tedious (especially if reinstalling a lot). Package selection seems a bit off... I did a virtualization package, no custom..did not install qemu, libvirt, and all attempts to do any virtualization failed due to non-installed packages. Then I decided to select all the virtualization packages in custom, but had selected 'web server' as the base package. I was never able to connect to the net here at home...apparently some things with 'modprobe' did not install and the eth devices 'does not exist' or something like that. Then I decided on the entire gnome package, with all the bells and whistles...everything worked, but who wants that? I removed some packages in gnome to see and reboot made machine dead. Did that 4 different times with very few package removals. Did a number of various tries with custom selections, but the dependencies seem to not be grabbing all it needs to work. Never got a non gnome setup to recognize eth devices (well, one time, but it never was able to get the net). I just installed a custom set up, all virtualization packages- virtualization selected as base. I added some gnome stuff and a few other doo dads.....booted up..went right to the command line.... no virt software works, errors everywhere. Display will not come up (x, vnc, or gnome no matter what).. Every installation, in first boot up had major missing or odd problems. One time I booted up with a gnome set up and selinux was stopping 5 differetn gdm programs..at boot...due to security risks... wtf? Any attempt to disable or make selinux permissive results in a dead machine, unable to ever boot again (left one up for 12 hours, never came back up, thought it was relabeling, but no message.) Removing packages with the gnome running only worked about 10% of the time, all others resulted in dead machine at reboot. I am considering, the only way to actually install and use this as a virtualized host is to go full desktop and hope the selinux enforcing will not break the system (with all the programs it will not let run on boot)... I have never, not once, been able to connect to the net in the command line setups...I know how to configure eths, network, dns, etc...not once, not even dhcp..config eth0 up, etc.. Gnome has not a single issue with the same exact file setups.. Many command line setups would not even see the eth devices, something about modprobe this or that not installed.....wth? quite an interesting task. I have now taken the server out of the center and am just going to endlessly install until I get a system that is low resources and actually allows the virtualization to work. My last install, with all virt packages selected...?..... cannot run virt-manager, libvirt, though some virt programs do work...why? something each needed to run was not installed as a dependency....<smacks head> Reinstalling would not be so bad, but the anaconda installer does not quite set up the drives the same on a reinstall forcing a deletion of partitions and redoing the entire setup..quite annoying /rant off

7 9

Broadcom NetXtremeII and CentOS 6
by stwe22＠comcast.net 11 Oct '11

11 Oct '11

Has anyone managed to get CentOS 6 x86_64 running on a server with a Broadcom NetXtremeII BCM5709 network adaptor? If so have you seen any issues with the network freezing? On booting everything works fine then the network will just stop - can't ping anything. If we manually restart the network service it will run again for a few seconds/minutes before hanging again. We have even installed the latest bnx2 drivers (netxtreme2-6.2.23) as supplied by the server manufacturer - problem remains. Any ideas/thoughts would be greatly appreciated.

3 2

trace?
by hadi motamedi 11 Oct '11

11 Oct '11

Dear All I have installed an announcement application on my centos 6.0 server that calls for putting specific voice announcement files under /usr/local/srf/bin/prompt to be played in response to certain conditions occurred . There are a huge number of files in the announcement directory and it seems that just one of these voice files is corrupt . Can you please let me know how can I trace in real time to see which application is going to use this folder and which of these files will be accessed at the moment ? My goal is to find that corrupted voice file in real time . Thank you

5 9

centos6: usbip: how to build and use it?
by Dario Lesca 11 Oct '11

11 Oct '11

Someone can show me how to build the usbip standard kernel modules for centos 6? For other distro (mandr*, suse, debian ubuntu, ecc) this standard kernel driver and our control programs and daemon are on standard repository then installable via yum or apt-get > http://rpm.pbone.net/index.php3?stat=3&limit=1&srodzaj=1&dl=40&search=usbip… Many thanks -- Dario Lesca (Inviato dal mio Fedora Linux)

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