Cannot start server with an unknown storage engine: mmapv1.

Description:

I followed the instructions here:
https://docs.rocket.chat/installation/manual-installation/ubuntu

The doc says I have to use mmapv1 storage engine in order to use rocket chat.

Steps to reproduce:

1. Follow these steps: https://docs.rocket.chat/installation/manual-installation/ubuntu
2. sudo systemctl status rocketchat - Failed
3. cat /var/log/mongodb/mongod.log
4. you should see: Cannot start server with an unknown storage engine: mmapv1.

Expected behavior:

It should work as the documentation says.

Actual behavior:

Explained above

Server Setup Information:

• Version of Rocket.Chat Server: newest
• Operating System: Ubuntu 20
• Deployment Method: manual
• Number of Running Instances: 1
• DB Replicaset Oplog: -
• NodeJS Version: 12.18.14
• MongoDB Version: 4.4.3

Client Setup Information

• Desktop App or Browser Version:
• Operating System:

Additional context

Relevant logs:

{"t":{"$date":"2021-01-18T09:18:24.219-08:00"},"s":"I",  "c":"CONTROL",  "id":23285,   "ctx":"main","msg":"Automatically disabling TLS 1.0, to force-enable TLS 1.0 specify --sslDisabledProtocols 'none'"}
{"t":{"$date":"2021-01-18T09:18:24.225-08:00"},"s":"W",  "c":"ASIO",     "id":22601,   "ctx":"main","msg":"No TransportLayer configured during NetworkInterface startup"}
{"t":{"$date":"2021-01-18T09:18:24.225-08:00"},"s":"I",  "c":"NETWORK",  "id":4648601, "ctx":"main","msg":"Implicit TCP FastOpen unavailable. If TCP FastOpen is required, set tcpFastOpenServer, tcpFastOpenClient, and tcpFastOpenQueueSize."}
{"t":{"$date":"2021-01-18T09:18:24.225-08:00"},"s":"W",  "c":"ASIO",     "id":22601,   "ctx":"main","msg":"No TransportLayer configured during NetworkInterface startup"}
{"t":{"$date":"2021-01-18T09:18:24.225-08:00"},"s":"I",  "c":"STORAGE",  "id":4615611, "ctx":"initandlisten","msg":"MongoDB starting","attr":{"pid":72103,"port":27017,"dbPath":"/var/lib/mongodb","architecture":"64-bit","host":"6g"}}
{"t":{"$date":"2021-01-18T09:18:24.225-08:00"},"s":"I",  "c":"CONTROL",  "id":23403,   "ctx":"initandlisten","msg":"Build Info","attr":{"buildInfo":{"version":"4.4.3","gitVersion":"913d6b62acfbb344dde1b116f4161360acd8fd13","openSSLVersion":"OpenSSL 1.1.1f  31 Mar 2020","modules":[],"allocator":"tcmalloc","environment":{"distmod":"ubuntu1804","distarch":"x86_64","target_arch":"x86_64"}}}}
{"t":{"$date":"2021-01-18T09:18:24.225-08:00"},"s":"I",  "c":"CONTROL",  "id":51765,   "ctx":"initandlisten","msg":"Operating System","attr":{"os":{"name":"Ubuntu","version":"20.04"}}}
{"t":{"$date":"2021-01-18T09:18:24.225-08:00"},"s":"I",  "c":"CONTROL",  "id":21951,   "ctx":"initandlisten","msg":"Options set by command line","attr":{"options":{"config":"/etc/mongod.conf","net":{"bindIp":"127.0.0.1","port":27017},"processManagement":{"timeZoneInfo":"/usr/share/zoneinfo"},"replication":{"replSetName":"rs01"},"storage":{"dbPath":"/var/lib/mongodb","engine":"mmapv1","journal":{"enabled":true}},"systemLog":{"destination":"file","logAppend":true,"path":"/var/log/mongodb/mongod.log"}}}}
{"t":{"$date":"2021-01-18T09:18:24.226-08:00"},"s":"E",  "c":"STORAGE",  "id":20557,   "ctx":"initandlisten","msg":"DBException in initAndListen, terminating","attr":{"error":"Location18656: Cannot start server with an unknown storage engine: mmapv1"}}
{"t":{"$date":"2021-01-18T09:18:24.226-08:00"},"s":"I",  "c":"REPL",     "id":4784900, "ctx":"initandlisten","msg":"Stepping down the ReplicationCoordinator for shutdown","attr":{"waitTimeMillis":10000}}
{"t":{"$date":"2021-01-18T09:18:24.226-08:00"},"s":"I",  "c":"COMMAND",  "id":4784901, "ctx":"initandlisten","msg":"Shutting down the MirrorMaestro"}
{"t":{"$date":"2021-01-18T09:18:24.226-08:00"},"s":"I",  "c":"SHARDING", "id":4784902, "ctx":"initandlisten","msg":"Shutting down the WaitForMajorityService"}
{"t":{"$date":"2021-01-18T09:18:24.226-08:00"},"s":"I",  "c":"NETWORK",  "id":20562,   "ctx":"initandlisten","msg":"Shutdown: going to close listening sockets"}
{"t":{"$date":"2021-01-18T09:18:24.226-08:00"},"s":"I",  "c":"NETWORK",  "id":4784905, "ctx":"initandlisten","msg":"Shutting down the global connection pool"}
{"t":{"$date":"2021-01-18T09:18:24.226-08:00"},"s":"I",  "c":"STORAGE",  "id":4784906, "ctx":"initandlisten","msg":"Shutting down the FlowControlTicketholder"}
{"t":{"$date":"2021-01-18T09:18:24.226-08:00"},"s":"I",  "c":"-",        "id":20520,   "ctx":"initandlisten","msg":"Stopping further Flow Control ticket acquisitions."}
{"t":{"$date":"2021-01-18T09:18:24.226-08:00"},"s":"I",  "c":"REPL",     "id":4784907, "ctx":"initandlisten","msg":"Shutting down the replica set node executor"}
{"t":{"$date":"2021-01-18T09:18:24.226-08:00"},"s":"I",  "c":"NETWORK",  "id":4784918, "ctx":"initandlisten","msg":"Shutting down the ReplicaSetMonitor"}
{"t":{"$date":"2021-01-18T09:18:24.226-08:00"},"s":"I",  "c":"SHARDING", "id":4784921, "ctx":"initandlisten","msg":"Shutting down the MigrationUtilExecutor"}
{"t":{"$date":"2021-01-18T09:18:24.226-08:00"},"s":"I",  "c":"CONTROL",  "id":4784925, "ctx":"initandlisten","msg":"Shutting down free monitoring"}
{"t":{"$date":"2021-01-18T09:18:24.226-08:00"},"s":"I",  "c":"STORAGE",  "id":4784927, "ctx":"initandlisten","msg":"Shutting down the HealthLog"}
{"t":{"$date":"2021-01-18T09:18:24.226-08:00"},"s":"I",  "c":"STORAGE",  "id":4784929, "ctx":"initandlisten","msg":"Acquiring the global lock for shutdown"}
{"t":{"$date":"2021-01-18T09:18:24.226-08:00"},"s":"I",  "c":"-",        "id":4784931, "ctx":"initandlisten","msg":"Dropping the scope cache for shutdown"}
{"t":{"$date":"2021-01-18T09:18:24.226-08:00"},"s":"I",  "c":"FTDC",     "id":4784926, "ctx":"initandlisten","msg":"Shutting down full-time data capture"}
{"t":{"$date":"2021-01-18T09:18:24.226-08:00"},"s":"I",  "c":"CONTROL",  "id":20565,   "ctx":"initandlisten","msg":"Now exiting"}
{"t":{"$date":"2021-01-18T09:18:24.226-08:00"},"s":"I",  "c":"CONTROL",  "id":23138,   "ctx":"initandlisten","msg":"Shutting down","attr":{"exitCode":100}}

Start with the Ubuntu manual-installation guide linked in the issue and compare its MongoDB storage-engine setting with the reported MongoDB 4.4.3 error. Update the documented setup so it matches the supported configuration, then verify the guide no longer produces the unknown-storage-engine failure.