MongoDB what are the default user and password?

Question

By default mongodb has no enabled access control, so there is no default user or password.

To enable access control, use either the command line option --auth or security.authorization configuration file setting.

You can use the following procedure or refer to Enabling Auth in the MongoDB docs.

Procedure

Start MongoDB without access control.
```
mongod --port 27017 --dbpath /data/db1
```
Connect to the instance.
```
mongo --port 27017
```

Create the user administrator.

use admin
db.createUser(
  {
    user: "myUserAdmin",
    pwd: "abc123",
    roles: [ { role: "userAdminAnyDatabase", db: "admin" } ]
  }
)

Re-start the MongoDB instance with access control.
```
mongod --auth --port 27017 --dbpath /data/db1
```

Authenticate as the user administrator.

mongo --port 27017 -u "myUserAdmin" -p "abc123" \
  --authenticationDatabase "admin"