If you use Puppet at all, you should be using Hiera if you’re not already !
tutorial
I was preparing an update for a Xenserver pool with over 100 VMs on it and I forgot that when you apply patches on Xenserver nodes, you need to eject images/ISO/DVDs from the virtual machines.
It happens.
You have a Master -> Slave MySQL replication and your master crashes
for a reason or another.
Thanks to the hard work of the puppet-openstack community, Puppet was the preferred method of deployment for Openstack in the latest Openstack User Survey.