Documentation overview:
https://www.cloudera.com/documentation/enterprise/6/6.2.html
Official api:
https://www.cloudera.com/documentation/enterprise/6/6.2/topics/cloudera_manager.html
cm Management:
https://www.cloudera.com/documentation/enterprise/6/6.2/topics/cm_mc_managing_clusters.html#cmug_topic_6
Expansion:
https://www.cloudera.com/documentation/enterprise/6/6.2/topics/cm_mc_adding_hosts.html
CDH5 to upgrade from 6:
https://www.cloudera.com/documentation/enterprise/upgrade/topics/ug_cdh_upgrading_top.html