[Openstack] HA Compute & Instance Evacuation
We're using the original Masakari project for this and it works really
well. In fact just last week we lost a compute node and all of VM's were
successfully migrated to a reserve host in under 5 minutes. It's a really
nice feeling when your infrastructure heals itself before you even get a
chance to start troubleshooting.
It does require a good deal of configuration to get it up and running,
especially the clustering with Pacemaker/Corosync so be prepared to get
familiar with those tools and STONITH if you're not already. Worth it if
some of your infrastructure doesn't have redundancy built in at higher
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