mongo localhost -u username -p pwd --authenticationDatabase admin --authenticationMechanism SCRAM-SHA-1

db.createUser(
  {
    user: "username",
    pwd: "passwrd",
    roles: [ { role: "readWrite", db: "shujuku" },
  }
)

shell建立使用者並登入

think that auth = true is an invalid configuration and your mongod is not starting because of it. To enable 

security:
  authorization: enabled

Then, to connect to the database, make sure that your client is using the correct authentication database and authentication mechanism. This can be done using the commmand line by the following command:

mongo localhost 
 
-u admin -p myAdminPass --authenticationDatabase admin --authenticationMechanism SCRAM-SHA-1