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October 5, 2009

RHEL, failed to add iptables rule to allow DHCP requests from 'virbr0'

I've just updated my RHEL 5.3 box with the last months' updates moving it to the 5.4 release.

Just after the yum update finished I've begun to receive a LOT of messages containing

OBJECT: python /usr/share/rhn/virtualization/poller.py

BODY: libvir: QEMU error : failed to add iptables rule to allow DHCP requests from 'virbr0' : Invalid argument


The solution to that, after a yum whatprovides "*/poller.py" was to remove any instance of the rhn-virtualization-host from my machine (since I do not have any virtualization need).

Cheers,

     Nicola

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Filed under  //   GNU/Linux   kvm   linux   qemu   RHEL   sysadmin   virtualization   xen  

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September 22, 2009

Nagios is RedHat's Standard Alerting System

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Nagios

The Nagios Community is happy to inform that Nagios is used as RedHat's standard alerting system. Nick Otto gave a presentation at the RedHat Summit in Chicago earlier this month, in which he covers Nagios and other great OSS tools that are used inside one of the front-runners in commercial Open Source.

via nagios.org

 

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Filed under  //   GNU/Linux   monitoring   nagios   redhat   RHEL   sysadmin  

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July 16, 2009

Func

Read more on func.et.redhat.com

Func is a secure, scriptable remote control framework and API. It is intended to replace SSH scripted infrastructure for a variety of datacenter automation tasks (such as taking hardware inventory, running queries, or executing remote commands) that are run against a large amount of systems at the same time.

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Filed under  //   fedora   GNU/Linux   Red Hat   RHEL   sysadmin  

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July 16, 2009

restore grub installation [Fedora, Centos, RHEL & derivates]

Have you ever found yourself with a non-booting GNU/Linux box?
 
If the cause is a corrupted grub installation (by a bad move on kernel upgrade, a Windows update or whatever) all you have to do is simply:
 

  • set the BIOS of your machine to have CD/DVD-rom player as the 1st boot device; 
  • insert the Fedora/CentOS/RHEL media on it and boot the system, 
  • choose {or manually insert}: linux rescue and press return, 
  • a number of messages will be displayed until you will be taken to a working shell and your old system is mounted on /mnt/sysimage path, 
  • give 'chroot /mnt/sysimage' command to "phisically translate" the shell on your original installation 
  • 'cd /boot/grub' 
  • then check where grub results installed if you have different disks on your machine with a grep '#boot' grub.conf 
  • read the output, verify it's correct eventually with the help of an fdisk -l command, 
  • now you are ready to install grub, after you've choosen the device (or partition) where it sould is located give the command grub-install /dev/device-choosen {ie that could be /dev/sda} 
  • now close the shell and reboot, the system should be working correctly now! 
 
Enjoy ;-)

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Filed under  //   centos   fedora   GNU/Linux   how-to   rescue   RHEL   sysadmin  

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