Mongo: provide default user - mongodb

Question

I'd like to get how to provide a default user on mongo.
Up to now, we've been able to provide a mongo instance using chef. It's working with this configuration file (mongod.conf):
---
systemLog:
path: "/var/log/mongodb/mongod.log"
logAppend: true
destination: file
processManagement:
fork: true
pidFilePath: "/var/run/mongodb/mongod.pid"
net:
port: 30158
bindIp: localhost
security:
authorization: enabled
storage:
dbPath: "/var/lib/mongo"
journal:
enabled: true
As you can see mongo is running with authorization. So, I'd like to provide a default user - passwd values in order to allow to access to the mongo instance.
So, I want to get it wihout having to interact with mongo command client. Is there any way to perform an script?
I don't know if I've explained so well.

Answer 1

You can create a administrator user in the following manner:
use admin
db.createUser(
{
user: "myUserAdmin",
pwd: "abc123",
roles: [ { role: "userAdminAnyDatabase", db: "admin" } ]
}
)
You can then login using the credentials:
mongo --port 27017 -u "myUserAdmin" -p "abc123" \
--authenticationDatabase "admin"

Answer 2

You can create a user and assign role to it,
use myDb;
db.createUser({user : 'myUser',pwd:'myPassword',roles:[{role : 'readWrite',db : 'myDb'}]});
Your db connection string,
'mongodb://myUser:myPassword#localhost:27017/myDb',
From terminal,
mongo --port 27017 -u "myUser" -p "myPassword" --authenticationDatabase "myDb"