How do I add an admin user to Mongo in 2.6?

Question

I upgraded from 2.4 to 2.6 and authentication broke. This tutorial seems pretty straightforward but I keep getting locked out of my own database. My situation is pretty si

Answer 1

Apparently the "system user administrator" isn't enough. Create a root user:

> db.createUser({user:"someadmin",pwd:"secret", roles:[{role:"root",db:"admin"}]})

Then add your database user:

> use some_db
> db.createUser(
    {
      user: "mongouser",
      pwd: "someothersecret",
      roles: ["readWrite"]
    }
)

More details on this gist. Comments on gist and better answers on SO welcome - I'm not a sys admin