MongoDB 3.2 authentication failed

Question

I create a user with the following set of commands. This should create user in both admin db as well as my target db (c2d):

# mongo 127         


        

Answer 1

If you log in through shell, make sure your create user under db "admin", NOT under a customized db. In your case you switched to "c2d".

Here is what I have tried (Log in as "admin")

1. This one will work:

$ mongo -u admin -p --authenticationDatabase "admin"
> use admin
> db.createUser(
  {
    user: "user007",
    pwd: "YourP@ssw0rd",
    roles: [
       { role: "readWrite", db: "yourdb" },
    ]
  }
)

Output 1:

root@mongo-server:/# mongo -u admin -p --authenticationDatabase "admin"
MongoDB shell version v4.0.6
Enter password:
connecting to: mongodb://127.0.0.1:27017/?authSource=admin&gssapiServiceName=mongodb
MongoDB server version: 4.0.6
----
> use admin
switched to db admin
> db.createUser(
...   {
...     user: "user007",
...     pwd: "YourP@ssw0rd",
...     roles: [
...        { role: "readWrite", db: "yourdb" },
...     ]
...   }
... )
Successfully added user: {
        "user" : "user007",
        "roles" : [
                {
                        "role" : "readWrite",
                        "db" : "yourdb"
                }
        ]
}

root@mongo-server:/# mongo -u user007 -p YourP@ssw0rd

connecting to: mongodb://127.0.0.1:27017/?gssapiServiceName=mongodb
Implicit session: session { "id" : UUID("ceabf440-c584-4518-90f5-cc845eaec3b3") }
MongoDB server version: 4.0.6
---
>

2. This one will fail:

$ mongo -u admin -p --authenticationDatabase "admin"
> use yourdb
> db.createUser(
  {
    user: "user007",
    pwd: "YourP@ssw0rd",
    roles: [
       { role: "readWrite", db: "yourdb" },
    ]
  }
)

Output 2:

root@mongo-server:/# mongo -u admin -p --authenticationDatabase "admin"
MongoDB shell version v4.0.6
Enter password:
connecting to: mongodb://127.0.0.1:27017/?authSource=admin&gssapiServiceName=mongodb
MongoDB server version: 4.0.6
----
> use yourdb
switched to db yourdb
> db.createUser(
...   {
...     user: "user007",
...     pwd: "YourP@ssw0rd",
...     roles: [
...        { role: "readWrite", db: "yourdb" },
...     ]
...   }
... )
Successfully added user: {
        "user" : "user007",
        "roles" : [
                {
                        "role" : "readWrite",
                        "db" : "yourdb"
                }
        ]
}
>

root@mongo-server:/# mongo -u user007 -p YourP@ssw0rd
MongoDB shell version v4.0.6
connecting to: mongodb://127.0.0.1:27017/?gssapiServiceName=mongodb
2019-12-06T04:28:34.630+0800 E QUERY    [js] Error: Authentication failed. :
connect@src/mongo/shell/mongo.js:343:13
@(connect):1:6
exception: connect failed