version: '2'
volumes:
  mongodata:
    driver: local
services:
  mongo:
    image: mongo:latest
    hostname: ${MONGODB_HOST}
    restart: always
    ports:
      - "27017:27017"
    volumes:
      - mongodata:/data/db

# start the temporary container
docker run -d -v /tmp/mongodb --name tmpdb -e MONGODB_DBNAME=db_test mongo --auth
# do the user creation
docker run -it --link tmpdb --rm mongo sh -c 'mongo --host tmpdb --eval "db.createUser({ user: "admin", pwd: "password", roles: [ { role: "root", db: "admin" } ] });"'
# stop the server
docker stop tmpdb
# create new mongodb container, using the old ones data
docker run -d -p 27017:27017 --name mongo2 -e MONGODB_DBNAME=db_test mongo --auth
# clean up old container (we are using the volumes so they will stick around)
docker rm tmpdb

version: '3'
services:
  mongodb:
    image: mongo:3.5
    hostname: ${MONGODB_HOST}
    environment:
      - MONGO_INITDB_ROOT_USERNAME=alice
      - MONGO_INITDB_ROOT_PASSWORD=super-secret-password
    restart: on-failure
    ports:
      - 27017:27017
    volumes:
      - ./mongodb:/data/db