Upgrade MongoDB

  1. Remove the mongod resource from Pacemaker's control:

     pcs resource unmanage mongod-clone

  2. Stop the service on all of your controllers. On each controller, run:

     systemctl stop mongod

  3. Upgrade the relevant packages:]

     yum upgrade 'mongodb*' 'python-pymongo*'

  4. Reload systemd to account for updated unit files:

     systemctl daemon-reload

  5. Restart the mongod service on your controllers by running, on each controller:

     systemctl start mongod

  6. Return the resource to Pacemaker control:

     pcs resource manage mongod-clone

  7. Wait until the output of pcs status shows that the above resources are running.