Easy Works docker compose create mongo's replica localhost - use with setup.sh

command line

docker compose up -d

docker-compose.yml

version: '3'

services:
  mongosetup:
    image: mongo
    depends_on:
      - mongo1
      - mongo2
      - mongo3
    volumes:
      - ./setup.sh:/scripts/setup.sh
    restart: 'no'
    entrypoint: ['bash', '/scripts/setup.sh']

  mongo1:
    hostname: mongo1
    container_name: localmongo1
    image: mongo
    expose:
      - 27011
    ports:
      - 27011:27011
    restart: always
    entrypoint: ['/usr/bin/mongod', '--port', '27011', '--bind_ip_all', '--replSet', 'rs0']
  mongo2:
    hostname: mongo2
    container_name: localmongo2
    image: mongo
    expose:
      - 27012
    ports:
      - 27012:27012
    restart: always
    entrypoint: ['/usr/bin/mongod', '--port', '27012', '--bind_ip_all', '--replSet', 'rs0']
  mongo3:
    hostname: mongo3
    container_name: localmongo3
    image: mongo
    expose:
      - 27013
    ports:
      - 27013:27013
    restart: always
    entrypoint: ['/usr/bin/mongod', '--port', '27013', '--bind_ip_all', '--replSet', 'rs0']

hosts

127.0.0.1 mongo1
127.0.0.1 mongo2
127.0.0.1 mongo3

setup.sh

echo "sleeping for 10 seconds"
sleep 10

echo mongo_setup.sh time now: `date +"%T" `
mongo --host mongo1:27011 <<EOF
  var cfg = {
    "_id": "rs0",
    "version": 1,
    "members": [
      {
        "_id": 0,
        "host": "mongo1:27011",
        "priority": 2
      },
      {
        "_id": 1,
        "host": "mongo2:27012",
        "priority": 0
      },
      {
        "_id": 2,
        "host": "mongo3:27013",
        "priority": 0
      }
    ]
  };
  rs.initiate(cfg);
EOF

* IMPORTANT *

Add 3 lines in /etc/hosts

sudo vi /etc/hosts

127.0.0.1 mongo1
127.0.0.1 mongo2
127.0.0.1 mongo3