Docker compose mongo wont create root user - mongodb

Question

I am trying to create to compose a docker container with a mongo image. I want the container to have a root user called admin and also be able to create a database called experts_db. Here is my docker-compose.yaml:
version: '3.7'
services:
mongodb:
image: mongo:4.0.4
container_name: mongodbtest
restart: always
env_file: .env
environment:
MONGO_INITDB_ROOT_USERNAME: admin
MONGO_INITDB_ROOT_PASSWORD: 123456789
MONGO_INITDB_DATABASE: experts_db
ports:
- 27017:27017
volumes:
- ./mongo-init.js:/docker-entrypoint-initdb.d/mongo-init.js:ro
and here is my mongo-init.js file:
use admin;
db.createUser(
{
user: "andrea",
pwd: "123456789",
roles: [
"userAdminAnyDatabase",
"dbAdminAnyDatabase",
"readWriteAnyDatabase"
]
}
);
Despite that, when I am in the mongo shell and try to get a list of all users, I get the following error:
use experts_db
switched to db experts_db
> db.getUsers()
2020-01-22T14:30:00.569+0000 E QUERY [js] Error: command usersInfo requires authentication :
_getErrorWithCode#src/mongo/shell/utils.js:25:13
DB.prototype.getUsers#src/mongo/shell/db.js:1763:1
#(shell):1:1
Does anyone know why this happens? I am new to mongo and dont understand how I could fix this

Answer 1

You need to remove the data/db/ volume inside your container then rerun and build again
rm -rf data/db/. # This command should be run from within the container
docker-compose up --build

Answer 2

I have tested the JS script below and it works as expected:
db.createUser(
{
user: "aaa",
pwd: "123",
roles: [ { role: "readAnyDatabase", db: "admin" }, { role: "dbAdminAnyDatabase", db: "admin" }, { role: "userAdminAnyDatabase", db: "admin" }]
});
After the creation, you can hop on mongoDB shell and run db.getUsers() to make sure the user has been successfully created.