Here is my experience and how I solved the issue.   After I installed mysql both oozie and cloudera manager stopped working.   After I looked at the log  /var/log/cloudera-scm-server, I created user in mysql and granted permission. Both started working.    Here is the script    CREATE USER 'oozie'@'localhost' IDENTIFIED BY 'cloudera'; GRANT ALL PRIVILEGES ON *.* TO 'oozie'@'localhost' WITH GRANT OPTION;   CREATE USER 'cm'@'localhost' IDENTIFIED BY 'cloudera'; GRANT ALL PRIVILEGES ON *.* TO 'cm'@'localhost' WITH GRANT OPTION;   ... View more