Configure instance affinity rules

This is a guide on how to make sure the a group of instances do not run on the same compute node. For example if you want to run a cluster of instances you do not want multiple instances to fail if a compute node fails.

First you create an anti affinity group.

nova server-group-create --policy anti-affinity cluster-group-1


And then add the instance to the group when you deploy it.

nova boot --image IMAGE_ID --flavor m1.small --hint group=SERVER_GROUP_UUID cluster-node-1


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