https://community.cloudera.com/t5/Support-Questions/unable-to-start-postgres-for-ambari/m-p/154311#M116767 <P>I am trying to start ambari and it fails while starting postgres on the sandbox.</P><P>[root@sandbox ~]# ambari-server restart Using python /usr/bin/python2 Restarting ambari-server Using python /usr/bin/python2 Stopping ambari-server Ambari Server is not running Using python /usr/bin/python2 Starting ambari-server Ambari Server running with administrator privileges. Running initdb: This may take upto a minute. About to start PostgreSQL ERROR: Exiting with exit code 3. REASON: Unable to start PostgreSQL server. Status stopped. . Exiting</P><P>I tried to start postgres</P><P>[root@sandbox ~]# service postgresql start Starting postgresql service: [FAILED]</P><P>Then I ran a postgres status:</P><P>[root@sandbox ~]# service postgresql status postmaster is stopped</P><P>I am not sure how to start postmaster. I tried </P><P>[root@sandbox ~]# pg_ctl start pg_ctl: cannot be run as root Please log in (using, e.g., "su") as the (unprivileged) user that will own the server process.</P><P>Any other ideas?</P> Thu, 23 Jun 2016 19:20:20 GMT sunile_manjee 2016-06-23T19:20:20Z