Chapter 4. Testing Evacuation with Instance HA
The following procedure involves deliberately crashing a Compute node. Doing this forces the automated evacuation of instances through 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, using the
stack@director $ . stackrc stack@director $ ssh -l heat-admin compute-n heat-admin@compute-n $
Crash the Compute node.
heat-admin@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