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MongoDB URI Authentication

The connection between Rocket.Chat and MongoDB instance is achieved using a MongoDB Connection String URI. MongoDB authentication is done with the username and password.
Adding the following snippet in your env does the trick.
MONGO_URL=mongodb://[username:[email protected]]host1[:port1][,...hostN[:portN]][/[defaultauthdb][?options]]
In your container, passing in MONGO_URL and MONGO_OPLOG_URL with the right values for connection.
Depending on the password you're using, you might need to escape some characters, for example.. Please take a look at MongoDB documentation https://docs.mongodb.com/manual/reference/connection-string/
Your docker-compose.yml file should look like this
environment:
- "MONGO_URL=mongodb://rctestuser:[email protected]:27017/rocketchat?authSource=admin"
- "MONGO_OPLOG_URL=mongodb://rctestuser:[email protected]:27017/local?authSource=admin"
If using docker run, it should look like this:
docker run \ -e "MONGO_URL=mongodb://rctestuser:[email protected]:27017/rocketchat?authSource=admin" \
-e "MONGO_OPLOG_URL=mongodb://rctestuser:[email protected]:27017/local?authSource=admin" \
rocketchat/rocket.chat:X.X.X

Mongo Authentication Role

If you are using mongo authentication you might also need to add the clustermonitor role to your user. This is a requirement in order for your instance to be able to use change streams.
Execute the following command replacing the users with that selected for your users.
admin = db.getSiblingDB("admin");
admin.grantRolesToUser('OPLOGUSER',[{ role: "clusterMonitor", db: "admin" }])
admin.grantRolesToUser('ROCKETUSER',[{ role: "clusterMonitor", db: "admin" }])