mongo 6.x setup.md

1. Install mongo
2. Setup replica set

replication:
  replSetName: "rs0"

3. Initiate replica set

rs.initiate(
  {
    _id : "rs0",
    members: [
      { _id : 0, host : "<remote-ip>:<remote-port>" }
    ]
  }
)

4. Bind to 0.0.0.0 for ALL remote connection, bindIp specify which ip is allowed to connect

net:
  port: 27017
  bindIp: 0.0.0.0

5. Setup authentication

use admin;
db.createUser(
  {
    user: "<your-username>",
    pwd: "<your-password>",
    roles: [
      { role: "userAdminAnyDatabase", db: "admin" },
      { role: "readWriteAnyDatabase", db: "admin" }
    ]
  }
)

6. Generate key file (required by replica set)

openssl rand -base64 756 > /etc/mongodb/keyFiles/mongo-key
chmod 400 /etc/mongodb/keyFiles/mongo-key
chown mongodb /etc/mongodb/keyFiles/mongo-key

7. Enable authorization

security:
  authorization: "enabled"
  keyFile: /etc/mongodb/keyFiles/mongo-key

8. Remote connection string

mongodb://<username>:<password>@<remote-ip>:<remote-port>/?authMechanism=DEFAULT&authSource=<auth-source>

• username - refer step 5
• password - refer step 5
• remote-ip - refer step 3
• remote-port - refer step 3
• auth-source - refer step 5, which db did you createUser on

When in doubt, check system logs:

systemLog:
  destination: file
  logAppend: true
  path: /var/log/mongodb/mongod.log