Upgrading production MongoDB to a newer version

In this recipe, we will look at how to upgrade MongoDB binaries in a replica set. This recipe holds true even for config and shard servers.

Getting ready

We will assume you have a three-node MongoDB replica set.

How to do it...

1. Before even touching a system, go through the release notes carefully. There are serious implications when upgrading binaries that have backward-incompatible changes or variance in operational parameters.
2. Take a full backup of your entire system.
3. If you have installed MongoDB binaries using the operating system's package manager, such as apt (Ubuntu) or yum (Red Hat/CentOS), the upgrade process might trigger a service restart. Hence, do not install new packages until the service is manually shut down.
4. Log in to one of the secondary nodes in the replica set and shut it down:

use admin
db.shutdownServer()

5. Once the mongod/mongos instance is shut down, install the upgraded package on the system and start the service.

 

6. Log in to the...