Creating a Cluster on OpenStack
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Enable lifetime management

The Enable lifetime management option allows you to have your cluster automatically terminated after a certain amount of time.

If you would like your cluster to be automatically terminated after a specific amount of time (defined as “Time to Live” in minutes), on the advanced General Configuration page of the create cluster wizard, check the Enable lifetime management option, and enter the “Time to Live” in minutes.

You will not be able to reverse this.