Supported Mongo Versions

Rocket.Chat currently requires MongoDB from version 3.2 and higher. We recommend using version 3.6.9.

Without mongodb version we can’t ensure you are running a compatible version. If you are running your mongodb with auth enabled and an user different from admin you may need to grant permissions for this user to check cluster data.
You can do it via mongo shell running the following command replacing the string YOUR_USER by the correct user's name:

db.runCommand({ grantRolesToUser: "YOUR_USER" , roles: [{role: "clusterMonitor", db: "admin"}]})

Supported Storage Engines

The Storage engine recommended for Rocket.Chat is MMAPv1.

We are currently testing WiredTiger for better performance with larger servers, but for now you should stick to MMAPv1 for large installs.