Localhost Exception
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Important
On a mongod instance, the localhost exception only
applies when there are no users or roles created in the MongoDB
instance.
The localhost exception allows you to enable access control and then
create the first user or role in the system. After you enable access
control, connect to the localhost interface and create the first user in
the admin database.
If you create a user first, the user must have privileges to create
other users. The userAdmin or
userAdminAnyDatabase role both confer the privilege to
create other users.
Warning
Connections using the localhost exception have access to create only the first user or role.
Once you create any user or role, the localhost exception is
disabled. If you need to create a user and a role, you must create
the user first using one of the builtin userAdmin or
userAdminAnyDatabase roles. If you create a role first,
you won't be able to create a user.
The ability to create a role first with the db.createRole()
method is specifically for users authorizing with LDAP. See LDAP
Authorization for more information.
Localhost Exception for Sharded Clusters
Important
On a
mongos, the localhost exception only applies when there are no sharded cluster users or roles created.In a sharded cluster, the localhost exception applies to each shard individually as well as to the cluster as a whole.
Once you create a sharded cluster and add a user administrator through the mongos instance, you
must still prevent unauthorized access to the individual shards. To
prevent unauthorized access to individual shards, follow one of the
following steps for each shard in your cluster:
Create a user administrator on the shard's primary.
Disable the localhost exception at startup. To disable the localhost exception, set the
enableLocalhostAuthBypassparameter to0.