Configure Ceph RBD caching on OpenStack Nova
By default, OpenStack doesn’t use any caching. However, you might want to enable the RBD caching.
Consistent hosts file with Ansible
One of the things, that I hate the most about an infrastructure is to have an inconsistent platform.
Obviously DNS runs but it could fail, and then it’s always good to rely on your /etc/hosts.
However before this, it must be consistent.
Best localrc for DevStack
I simply collected all my localrc files and combined them into a single one. Feel free to grab the parts that interest you.
Openstack: unexplained high CPU load on compute nodes
Recently I encountered a weird issue: the CPU load of my hosts was quite high with a load average of 20 and picks to 40. First, I had a look at the guest system since the high load was generated by guests. Unfortunately the VM was not doing anything, no IOPS and no CPU.
DevStack in 1 minute
DevStack in 1 minute! Ready, steady, GO!
Configure Ubuntu 12.04 to use SOL
SOL: Serial Over Line is a wonderful feature that redirects your server’s console thanks to the goodness of IPMI.
Ceph: update Cephx Keys
It’s not really clear from the command line
OpenStack 3rd years retrospective
OpenStack: instance evacuation goes to host
With Grizzly came the instance evacuation but a quite recent addition to the code expended it to hosts.
Two nice websites to build Vagrant template
Quick article, two nice websites that can help you to build Vagrant templates.