Chapter 4. Testing Evacuation with Instance HA

Boot one or more instances on the overcloud before crashing the Compute node that hosts the instances to test.

stack@director $ . overcloudrc
stack@director $ nova boot --image cirros --flavor 2 test-failover
stack@director $ nova list --fields name,status,host

Log in to the Compute node that hosts the instances and change to the root user. Replace compute-n with the name of the Compute node:

stack@director $ . stackrc
stack@director $ ssh -l heat-admin compute-n
heat-admin@compute-n $ su -

Crash the Compute node.

root@compute-n $ echo c > /proc/sysrq-trigger

Wait a few minutes and then verify that these instances re-spawned on another Compute nodes.

stack@director $ nova list --fields name,status,host
stack@director $ nova service-list