Get paged Stop panicking Be sure to log into the broken node to verify it actually died. If the VMs are still running correctly on it, and it’s simply a networking problem, if you proceed to bring them up again you will encounter a bad state known as ‘Split Brain’. This is difficult to recover from, so please verify the dead node is truly dead. If there is more than 1 node left, try logging into the cluster IP (kvm.
I wanted a recent Ubuntu distribution though, which I couldn’t find provided for me online. So I rolled my own, and am reasonably pleased with the results. All of the hardware works, although there are some annoyances, such as no battery meter in the GNOME notification area, and the wireless card isn’t supported by NetworkManager, although still works with iwconfig and wpasupplicant. Additionally, the hotkeys on the top are not bound to any programs.
First off, you’re going to have to install the munin package. You’ll also need to have a web server installed, I prefer apache:
# For Gentoo, emerge munin apache # For CentOS/Fedora yum install munin apache # For Debian aptitude install munin apache Gentoo and CentOS both install the HTTP root in /var/www/localhost/htdocs/munin. After setup, the graphs will be available at http://localhost/munin
Debian requires a bit more attention. Debian munin installs the HTTP root in /var/www/munin.
Munin showed the most promise and compatibility with many of the services we run at the OSL, such as memcached and varnish. I liked how the plugin system is set up independently on each host, and that each plugin can be managed, configured, and consolidated through symlinks.
For the benefit of the uninitiated the setup on each node goes something like this:
#For gentoo emerge munin #For Fedora/CentOS yum install munin-node #For Debian/Ubuntu apt-get install munin-node Each client is a “node”, and runs the daemon ‘munin-node’.