Steps to decommission entire cluster

Hello Community,

I want to decommission an entire cluster, so I went looking around for any documentation that mentions any recommended procedure to follow but couldn't find any. 

Hence, i turned towards the community, if anyone here have decommissioned a kerberized and sentry-enabled cluster and can advice me on any best practices I can follow.

I think it is worth mentioning that our cluster is created using Cloudera Altus Director.

Thank you,

Snehasish