MongoDB shell authentication error - mongodb

Question

I created a user and password for a database called student.:
db.createUser({user:'Catalin',pwd:'Catalin',roles:[{role:'userAdmin',db:'student'}]});
So I restarted MongoDB Server with this command:
mongod --auth --dbpath C:\data\db
in another terminal, I connected to the sever with:
mongo
then queried the server with :
> db.getUsers()
[
{
"_id" : "student.Catalin",
"user" : "Catalin",
"db" : "student",
"roles" : [
{
"role" : "userAdmin",
"db" : "student"
}
]
}
]
went to the student database:
> use student
switched to db student
Entered my username and password succesfully via this command:
> db.auth('Catalin','Catalin');
1
and when I want to view my collections I get an error, WHY?:
> show collections
2016-03-07T15:54:41.166+0300 E QUERY [thread1] Error: listCollections failed:
{
"ok" : 0,
**"errmsg" : "not authorized on student to execute command { listCollectio
ns: 1.0, filter: {} }",**
"code" : 13
} :
_getErrorWithCode#src/mongo/shell/utils.js:23:13
DB.prototype._getCollectionInfosCommand#src/mongo/shell/db.js:746:1
DB.prototype.getCollectionInfos#src/mongo/shell/db.js:758:15
DB.prototype.getCollectionNames#src/mongo/shell/db.js:769:12
shellHelper.show#src/mongo/shell/utils.js:695:9
shellHelper#src/mongo/shell/utils.js:594:15
#(shellhelp2):1:1
"errmsg" : "not authorized on student to execute command { listCollectio
ns: 1.0, filter: {} }",
P.S. : I'm using mongoDB 3.2

Answer 1

The userAdmin built-in role only provides the ability to create and modify roles and users on a database. If you need access to the database, you would need to either assign database roles, or other roles that has database access such as dbOwner.
Please see Built-in Roles for more detailed information.
You may also find these useful:
Manage users and roles.
Enable client access control.

Answer 2

If you are using version 5 or befor DataBase MongoDB, pay attention to this point. You should not write anything in the mongod.conf file in the /etc/mongod.conf path. Use the following two commands to update the dependencies.
install dependencies :
sudo apt install libgconf-2-4
sudo add-apt-repository universe