Proper auth enablement for fresh mongo installation

gistfile1.txt

1. Start mongo without authentication
`mongod --port 27017 --dbpath /data/db1`

2. Run mongo shell
`mongo --port 27017`

3. Run following command to give admin user root priviliges
use admin
db.createUser(
  {
    user: "admin",
    pwd: "password",
    roles: [ { role: "root", db: "admin" } ]
  }
);
exit; 
4. Stop mongo
5. Start mongo with authentication enabled
`mongod --auth --port 27017 --dbpath /data/db1`