mount your external disk to /workspace,
and create an folde for storing DB's data, and set the owner to mongodb
   sudo mkdir /workspace/mongo_store
   sudo chown -R mongodb:mongodb mongo_store
| systemLog: | |
| destination: file | |
| path: "/var/log/mongodb/mongodb.log" | |
| quiet: false | |
| logAppend: true | |
| net: | |
| port: 27017 | |
| bindIp: 0.0.0.0 | |
| storage: | |
| dbPath: "/workspace/mongo_store" | |
| engine: wiredTiger |