upgrade-mongodb-ha.md

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.