Using authentication with DoctrineMongoDBBundle - mongodb

Question

I'm currently working on a project where I use mongodb as database, and I began with no security in my mongo configuration of the symfony config.yml.
This is what my config.yml looked like since the beginning of the project.
doctrine_mongodb:
connections:
default:
server: mongodb://localhost:27017
options: {}
default_database: louisv
document_managers:
default:
auto_mapping: true
With this parameters the project works very well.
But I want to add security to mongodb database. So I tried to follow documentation on mongodb to create users. I created an "admin" user for the admin database, and a "louisv" user for the louisv database (the admin database is the database existing by default, and louisv is mine).
Now I want to Symfony to use this new user. I changed my the option parameters from my conf.yml file and now this is what I have :
doctrine_mongodb:
connections:
default:
server: mongodb://localhost:27017
options:
username: louisv
password: password
default_database: louisv
document_managers:
default:
auto_mapping: true
Now when I try to enter my application in Symfony
Failed to connect to: localhost:27017: Authentication failed on database 'admin' with username 'louisv': auth fails
Which is weird cause my default_database is "louisv' and not 'admin'.
And if I change the credentials to admin's ones, I have another error:
localhost:27017: not authorized for query on louisv.User
Which seems quite good as it seems to search for users, but I can't do queries.

Answer 1

Instead of:
server: mongodb://localhost:27017
The following should do the trick:
server: mongodb://localhost:27017/louisv
Apparently, the Doctrine ODM bundle also has a "db" option now, so you now have the following options:
connections:
default:
server: mongodb://louisv:password#localhost:27017/louisv
or
connections:
default:
server: mongodb://localhost:27017
options:
username: louisv
password: password
db: louisv
The first option is preferred, as it allows for automatic re-authentication in case a connection drops.
See also:
https://github.com/doctrine/DoctrineMongoDBBundle/issues/154

Answer 2

In addition to #derick's answer, my configuration was still trying to connect to the "default" database - adding the default_database entry solved this.
connections:
default:
server: "mongodb://myuser:password#mydbserver:27017/mydb"
default_database: mydb
Remember to keep usernames and passwords in a "parameters" file separate from the config file if stored in source control :)