Create read-only, read-write and owner-user users on mongodb database

create_mongodb_users

use myDbName

// drop users
db.dropUser("ro_user");
db.dropUser("rw_user");
db.dropUser("owner_user");

// read-only user
db.createUser({
  user: "ro_user",
  pwd: "hereThePassword",
  roles: [
    { role: "read", db: "myDbName" }
  ],
  mechanisms:[  
    "SCRAM-SHA-1"
  ]
});

// read-write user
db.createUser({
  user: "rw_user",
  pwd: "hereThePassword",
  roles: [
    { role: "readWrite", db: "myDbName" }
  ],
  mechanisms:[  
    "SCRAM-SHA-1"
  ]
});

// owner-user
db.createUser({
  user: "owner_user",
  pwd: "hereThePassword",
  roles: [
    { role: "dbOwner", db: "myDbName" }
  ],
  mechanisms:[  
    "SCRAM-SHA-1"
  ]
});