Docker Compose Mongo with Mongo Express

docker-compose.yml

version: "3.5"

services:
  mongo:
    image: mongo:latest
    container_name: mongo
    environment:
      MONGO_INITDB_ROOT_USERNAME: admin
      MONGO_INITDB_ROOT_PASSWORD: admin
    ports:
      - "0.0.0.0:27017:27017"
    networks:
      - MONGO
    volumes:
      - type: volume
        source: MONGO_DATA
        target: /data/db
      - type: volume
        source: MONGO_CONFIG
        target: /data/configdb
  mongo-express:
    image: mongo-express:latest
    container_name: mongo-express
    environment:
      ME_CONFIG_MONGODB_ADMINUSERNAME: admin
      ME_CONFIG_MONGODB_ADMINPASSWORD: admin
      ME_CONFIG_MONGODB_SERVER: mongo
      ME_CONFIG_MONGODB_PORT: "27017"
    ports:
      - "0.0.0.0:8081:8081"
    networks:
      - MONGO
    depends_on:
      - mongo

networks:
  MONGO:
    name: MONGO

volumes:
  MONGO_DATA:
    name: MONGO_DATA
  MONGO_CONFIG:
    name: MONGO_CONFIG

Updated yaml with mongo-express waiting for mongo to start:

# Mongo and mongo-express that waits for it to complete it's initializaiton
version: '3.5'

services:

  mongo:
    image: mongo
    ports:
      - "27017:27017"
    command: sh -c "
      sleep 30 &&
      docker-entrypoint.sh mongod"

  mongo_admin:
    image: mongo-express
    depends_on:
      - mongo
    links:
      - mongo
    ports:
      - "8081:8081"
    volumes:
      - type: bind
        source: ./wait-for.sh
        target: /wait-for.sh
    entrypoint:
      - /bin/sh
      - /wait-for.sh
      - --timeout=3600
      - mongo:27017
      - --
      - tini
      - --
      - /docker-entrypoint.sh

# Wait for another service to become available (e.g. mongo)
# see https://github.com/mrako/wait-for and https://gist.github.com/adamelliotfields/cd49f056deab05250876286d7657dc4b