Create Superuser in mongo

from docs.mongodb.org-superuser-roles

Lets write answer that looks simple & also simple to implement

Steps :

1 : sudo apt-get install mongodb-org – in new terminal

2 : sudo mongod --port 27017 --dbpath /var/lib/mongodb

3 : mongo --port 27017 – in new terminal

4 : use admin

5 : As @drmirror said a user should have all 4 roles to be superuser

For Mongo Version 2.

db.createUser(
{
    user: "tom",
    pwd: "jerry",
    roles: [
              { role: "userAdminAnyDatabase", db: "admin" },
              { role: "readWriteAnyDatabase", db: "admin" },
              { role: "dbAdminAnyDatabase", db: "admin" },
              { role: "clusterAdmin", db: "admin" }
           ]
})

For Mongo Version 3.

db.createUser(
   {
       user: "tom", 
       pwd: "jerry", 
       roles:["root"]
   })

6 : sudo /etc/init.d/mongod stop OR sudo service mongod stop – in new terminal

7 : sudo /etc/init.d/mongod start OR sudo service mongod start

8 : restart your pc

9 : sudo mongod --auth --port 27017 --dbpath /var/lib/mongodb – in new terminal

10: mongo --port 27017 -u "tom" -p "jerry" --authenticationDatabase "admin" – in new terminal

Note : step 10 is most important step .

it will give Output on terminal like

MongoDB shell version: 2.6.11
connecting to: 127.0.0.1:27017/test
>