Install Oracle 12c Flex Cluster

https://blog.dbi-services.com/install-oracle-12c-flex-cluster-easily/

Manual User Equivalence
https://gruffdba.wordpress.com/2012/10/30/oracle-11gr2-rac-sshusersetup-sh-script-to-swap-ssh-keys-between-hosts/

Error (Died at line 914)
http://oraclehub.com/convert-standard-to-flex-cluster/

Verification
https://www.red-gate.com/simple-talk/sql/oracle/oracle-flex-cluster-leaf-node-failover/

Database Creation Error (ORA-00445:background process "string" did not start after string seconds)
1: http://oracle.ninja/slow-system-ora-00445-background-process-diag-did-not-start-after-120-seconds/
2: Choose policy managed databases and server pools in advanced installation.