docker-compose rs init

docker-compose.yml

version: '3'
services:
  mongo1:
    hostname: mongo1
    container_name: localmongo1
    image: mongo
    restart: always
    expose:
      - 27017
    ports:
      - 27017:27017
    command: '--quiet --bind_ip_all --port 27017 --replSet rs0'
    volumes:
      - ./db1/mongo:/data/db
    #environment:
      #MONGO_INITDB_ROOT_USERNAME: root
      #MONGO_INITDB_ROOT_PASSWORD: root
    networks:
      - default
      - nginx-proxy

  mongo2:
    hostname: mongo2
    container_name: localmongo2
    image: mongo
    restart: always
    expose:
      - 27018
    ports:
      - 27018:27018
    command: '--quiet --bind_ip_all --port 27018 --replSet rs0'
    volumes:
      - ./db2/mongo:/data/db
    #depends_on:
      #- mongo1
    networks:
      - default
      - nginx-proxy

  mongo3:
    hostname: mongo3
    container_name: localmongo3
    image: mongo
    restart: always
    expose:
      - 27019
    ports:
      - 27019:27019
    command: '--quiet --bind_ip_all --port 27019 --replSet rs0'
    volumes:
      - ./db3/mongo:/data/db
    #depends_on:
      #- mongo2
    networks:
      - default
      - nginx-proxy

  rsinit:
    build:
      context: .
      dockerfile: rsinit
    depends_on:
      - mongo1
      - mongo2
      - mongo3
    entrypoint: ["sh", "-c", "rs.sh"]
    networks:
      - default
      - nginx-proxy

networks:
  nginx-proxy:
    external: true

rs.sh

#!/bin/bash

echo "prepare rs initiating"

check_db_status() {
  mongo1=$(mongo --host mongo1 --port 27017 --eval "db.stats().ok" | tail -n1 | grep -E '(^|\s)1($|\s)')
  mongo2=$(mongo --host mongo2 --port 27018 --eval "db.stats().ok" | tail -n1 | grep -E '(^|\s)1($|\s)')
  mongo3=$(mongo --host mongo3 --port 27019 --eval "db.stats().ok" | tail -n1 | grep -E '(^|\s)1($|\s)')
  if [[ $mongo1 == 1 ]] && [[ $mongo2 == 1 ]] && [[ $mongo3 == 1 ]]; then
    init_rs
  else
    check_db_status
  fi
}

init_rs() {
  ret=$(mongo --host mongo1 --port 27017 --eval "rs.initiate({ _id: 'rs0', members: [{ _id: 0, host: 'mongo1:27017' }, { _id: 1, host: 'mongo2:27018' }, { _id: 2, host: 'mongo3:27019' } ] })" > /dev/null 2>&1)
}

check_db_status > /dev/null 2>&1

echo "rs initiating finished"
exit 0

rsinit

FROM mongo

ADD rs.sh /usr/local/bin/

RUN chmod +x /usr/local/bin/rs.sh