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 to your .env file does the trick:
In your container, pass 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. Refer to the MongoDB documentation for more information
Your docker-compose.yml file should look like this:
- "MONGO_URL=mongodb://rctestuser:mymongopassword@mongo:27017/rocketchat?authSource=admin"
- "MONGO_OPLOG_URL=mongodb://rctestuser:mymongopassword@mongo:27017/local?authSource=admin"
If you are using docker run, it should look like this:
docker run \ -e "MONGO_URL=mongodb://rctestuser:mymongopassword@mongo:27017/rocketchat?authSource=admin" \
-e "MONGO_OPLOG_URL=mongodb://rctestuser:mymongopassword@mongo:27017/local?authSource=admin" \
MongoDB authentication role
If you are using MongoDB authentication, you might also need to add the clusterMonitor role to your user. The clusterMonitor role gives users read-only access to MongoDB monitoring tools. This is a requirement for your instance to be able to use change streams. Change streams allow your workspace to react to real-time changes in data
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" }])
Rocket.Chat versions receive support for six months after release.