version: '3'

services:
  mongoshard1:
      image: mongo:3.6.4
      environment:
        - MONGO_DATA_DIR=/data/db
        - MONGO_LOG_DIR=/dev/null
      ports:
          - 27020:27017
      command: mongod --replSet ${NAME} --port 27017 --oplogSize 16 --noprealloc --smallfiles
  mongoshard2:
      image: mongo:3.6.4
      environment:
        - MONGO_DATA_DIR=/data/db
        - MONGO_LOG_DIR=/dev/null
      ports:
          - 27021:27017
      command: mongod --replSet ${NAME} --port 27017 --oplogSize 16 --noprealloc --smallfiles
  mongoshard3:
      image: mongo:3.6.4
      environment:
        - MONGO_DATA_DIR=/data/db
        - MONGO_LOG_DIR=/dev/null
      ports:
          - 27022:27017
      command: mongod --replSet ${NAME} --port 27017 --oplogSize 16 --noprealloc --smallfiles
  mongoinit:
    image: mongo:3.6.4
    environment:
        - MONGO1=mongoshard1
        - MONGO2=mongoshard2
        - MONGO3=mongoshard3
        - RS=${NAME}
        - PORT=27017
    volumes:
        - ./:/scripts
    entrypoint: [ "/scripts/init.sh" ]
    links:
      - mongoshard1
      - mongoshard2
      - mongoshard3
    depends_on:
      - mongoshard1
      - mongoshard2
      - mongoshard3