Lab - Launching Mongod :creating a user

Hello ! I can not create a new user with this command:
mongo admin --host localhost:27000 --eval ’
db.createUser({
user: “m103-admin”,
pwd: “m103-pass”,
roles: [
{role: “root”, db: “admin”}
]
})

this is the error message :
Failed to connect to 127.0.0.1:27000 after 5000ms milliseconds, giving up.
2018-11-25T01: 19: 49.345 + 0000 E QUERY [thread1] Error: Could not connect to server localhost: 27000

Mongod is not running or it is using a different port.