Spring Data mongodb: how to add credentials when running a replica set - mongodb

Question

I'm running MongoDB 2.2. I can add credentials to access my single instance MongoDB like this:
<bean id="mongoTemplate" class="org.springframework.data.mongodb.core.MongoTemplate">
<property name="writeResultChecking" value="EXCEPTION"/>
<property name="writeConcern" value="FSYNC_SAFE"/>
<constructor-arg ref="myRs"/>
<constructor-arg name="databaseName" value="mydb"/>
<constructor-arg name="userCredentials" ref="userCredentials"/>
</bean>
<bean id="userCredentials" class="org.springframework.data.authentication.UserCredentials">
<constructor-arg name="username" value="username" />
<constructor-arg name="password" value="password" />
</bean>
but the docs say that only keyfile authentication is available for replica sets:
http://docs.mongodb.org/v2.2/administration/replica-sets/#replica-set-security
How can I use DB credentials preferrably (or even a keyfile) in the app context XML file so I can authenticate to the MongoDB replica set when using Spring Data MongoDB?
Thanks.

Answer 1

--keyfile option enables key based authentication between replicaset members. It has no effect the communication between your application and the replicaset.
You need to add a user to the database. Make sure you are connected to Primary.
$ mongo
PRIMARY> use the_database_i_want_to_be_authenticated
switched to db the_database_i_want_to_be_authenticated
PRIMARY> db.addUser("myusername","mypassword")
{
"user" : "myusername",
"readOnly" : false,
"pwd" : "a6de521abefc2fed4f5876855a3484f5",
"_id" : ObjectId("5194932444ef978a730c22d4")
}
After you created a user in the database, you will be able to connect it with the following
<bean id="userCredentials" class="org.springframework.data.authentication.UserCredentials">
<constructor-arg name="username" value="username" />
<constructor-arg name="password" value="password" />
</bean>