How to Setup MongoDb Access Control

When installed for the first time, there is no access control by default. To activate it, one must connect to the unprotected instance and create a new admin user like this:

db.createUser(
  {
    user: "myUserAdmin",
    pwd: passwordPrompt(), // or cleartext password
    roles: [ { role: "userAdminAnyDatabase", db: "admin" }, "readWriteAnyDatabase" ]
  }
)

Then restart the mongo process, either through the command line or

db.adminCommand( { shutdown: 1 } )

Source from the mongodb documentation, for mongo 4.4

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