Chapter 4. Testing Evacuation with Instance HA

Warning

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

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
```

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