Cluster environment readiness

You must ensure all the nodes have the supported operating system, Java version, and base Ambari version. Verify the disk space and mount point requirements before you begin the upgrade to the recommended interim HDP bits and CDP Private Cloud Base.

Operating System on all nodes	Operating System & Upgrading the cluster's underlying OS
Requirements and Supported Versions	CDP Private Cloud Base Requirements and Supported Versions
Java version on all nodes	Java Versions
Ambari base version on all nodes	For RHEL and CentOS, Ambari version is 2.6.2.x. For Ubuntu, Ambari version is 2.6.2.45.
Repositories	Software download matrix
Review disk space	Disk space and mountpoint considerations