Why katello-installer fails to start mongodb service on Red Hat Satellite 6.0 server?

Issue

• Why katello-installer fails to start mongodb service on Red Hat Satellite 6.0 server?

  # katello-installer
  Could not start Service[mongodb]: Execution of '/usr/share/katello-installer/modules/service_wait/bin/service-wait mongod start' returned 1: Starting mongod: [  OK  ]
  /Stage[main]/Mongodb::Server::Service/Service[mongodb]/ensure: change from stopped to running failed: Could not start Service[mongodb]: Execution of '/usr/share/katello-installer/modules/service_wait/bin/service-wait mongod start' returned 1: Starting  mongod: [  OK  ]
  Command exceeded timeout
  /Stage[main]/Pulp::Config/Exec[migrate_pulp_db]/returns: change from notrun to 0 failed: Command exceeded timeout
  Installing             Debug: /Stage[main]/Pulp::Service/Service[pulp_cel [99%] [.............................. ]