MongoDB and Docker via docker-compose auth error and not initalizing db

问题

I am new to Docker and I have read the Mongo Docker Docs. I need some help setting up a simple application.

I want a local mongodb that dumps / uses a database named "my_test_db" and writes to <project-dir>/mongo/my_test_db

Here is my simple project:

# project structure
<project-dir>/
-- .env
-- docker-compose.yml
-- mongo/
-- + -- my_test_db/

The .env file:

# <project>/.env
MONGO_INITDB_ROOT_USERNAME=test_user
MONGO_INITDB_ROOT_PASSWORD=test_pwrd
MONGO_INITDB_DATABASE=my_test_db
MONGO_DATA_DIR=/mongo/my_test_db
MONGO_LOG_FILE=/mongo/mongodb.log

my attempt at docker compose:

#docker-compose.yml

version: '3'
services:
  mongodb:
    image: mongo:4.0

    # load env variables
    env_file:
      - .env 

    # map data_dir to host <project>/<data_dir>
    volumes:
      - ".${MONGO_DATA_DIR}:${MONGO_DATA_DIR}"

    expose:
      - 27017

    # set env vars with loaded vars (appears to be necessary for the user to be created, despite loading them with env_file)
    environment:
      MONGO_INITDB_ROOT_USERNAME: ${MONGO_INITDB_ROOT_USERNAME}
      MONGO_INITDB_ROOT_PASSWORD: ${MONGO_INITDB_DATABASE}
      MONGO_INITDB_DATABASE: ${MONGO_INITDB_DATABASE}

    # map ports
    ports:
        - 27017:27017
    command: "mongod --smallfiles"
    container_name: mongodb-test
# --logpath=.${MONGO_LOG_FILE} # when added to command fails

then in two shells I have

#shell-1
<project-dir>$ docker-compose up

# I see my user created
# I see "MongoDB starting : pid=1 port=27017 dbpath=/data/db 64-bit host=e19ea190b601" so my custom db isnt made on init...

#shell-2
# <project-dir>$ mongo 27017 --usernamne test_user --password test_pwrd # does fails to connect
<project-dir>$ mongo 27017 # connects



> db.getName()
# 27017 # so naming it didnt work

> show users
# Error: command usersInfo requires authentication

> use my_test_db
> db.myColl.insert({'name': 'test'})
# WriteCommandError({..., "codeName": "Unauthorized"})

I am currently testing on macOS (as docs state that this might be relevant)

What am I doing wrong? I understand the concept of docker but personally don't use it as it is a pain to get used too... but I'm trying to learn.

回答1:

• For the authentication part: have you tried to add --authenticationDatabase admin in order to be able to login ?

• Regarding MONGO_INITDB_DATABASE it wont be effective unless you have a script under /docker-entrypoint-initdb.d/ as shown in the docker-entrypoiny.sh that is used in the mongodb image so you can have a bash script in docker-entrypoint-initdb.d/ with that said.

• Using the root user as an owner for your application db is not a security wise as it will have the ability to control everything in the mongodb instance.

  IMHO a better approach would be adding extra variables like the following:

  • MONGO_APPLICATION_DATABASE
  • MONGO_APPLICATION_USERNAME
  • MONGO_APPLICATION_PASSWORD

  Then add a bash script that will create the user and assign it to the database by using environment variables ( you need to mount it to docker-entrypoint-initdb.d):

  You might need to change the user role as you see fit.

  # initmongo/setup.sh
  mongo admin -u $MONGO_INITDB_ROOT_USERNAME -p $MONGO_INITDB_ROOT_PASSWORD --eval "db.getSiblingDB('$MONGO_APPLICATION_DATABASE').createUser({user: '$MONGO_APPLICATION_USERNAME', pwd: '$MONGO_APPLICATION_PASSWORD', roles: [{role: 'readWrite', db: '$MONGO_APPLICATION_DATABASE'}]});"
  

  In the docker-compose.yml add a volume to your current list of volumes

  #docker-compose.yml
  volumes:
    - ".${MONGO_DATA_DIR}:${MONGO_DATA_DIR}"
    - "./initmongo/:/docker-entrypoint-initdb.d/"
  

  And finally remove this variable MONGO_INITDB_DATABASE as there is no need for it

  In order to login use the following command:

  replace the variables with your actual values

  docker exec -it container_name mongo -u "$MONGO_APPLICATION_USERNAME" -p "$MONGO_APPLICATION_PASSWORD" --authenticationDatabase "$MONGO_APPLICATION_DATABASE" "$MONGO_APPLICATION_DATABASE"
  

• For the .env file i am not sure what could cause this issue. do you have any warnings while using it ? Also Consider checking this comment or this

来源：https://stackoverflow.com/questions/54967329/mongodb-and-docker-via-docker-compose-auth-error-and-not-initalizing-db