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 --replSet rs0'
    volumes:
      - /data/db/mongo:/data/db

  mongo2:
    hostname: mongo2
    container_name: localmongo2
    image: mongo
    restart: always
    expose:
      - 27017
    ports:
      - 27018:27017
    command: '--quiet --bind_ip_all --replSet rs0'

  mongo3:
    hostname: mongo3
    container_name: localmongo3
    image: mongo
    restart: always
    expose:
      - 27017
    ports:
      - 27019:27017
    command: '--quiet --bind_ip_all --replSet rs0'

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

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=$(mongo --host mongo2 --port 27017 --eval "db.stats().ok" | tail -n1 | grep -E '(^|\s)1($|\s)')
  mongo3=$(mongo --host mongo3 --port 27017 --eval "db.stats().ok" | tail -n1 | grep -E '(^|\s)1($|\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: 'mongo2:27017' }, { _id: 2, host: 'mongo3:27017' } ] })" > /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