MongoDB Replica Set docker-compose up (from ChatGPT 4 with ❤️)

README.md

1. Put the docker-compose.yml, initiate-replica.js and mongodb-keyfile in the same directory (e.g. project root)
2. Run docker-compose up (or docker-compose up -d for detached mode)

• you might have to modify the permissions on your keyfile, in order to do so you have to run chmod 600 mongodb-keyfile (remember to use Git Bash and not just a regular console)

docker-compose.yml

version: "3.8"
services:
  mongo1:
    image: mongo:4.4
    command: >
      bash -c "chown mongodb:mongodb /data/keyfile/mongodb-keyfile
      && chmod 600 /data/keyfile/mongodb-keyfile
      && mongod --keyFile /data/keyfile/mongodb-keyfile --replSet my-mongo-set --bind_ip_all"
    volumes:
      - ./mongodb-keyfile:/data/keyfile/mongodb-keyfile
    networks:
      - mongo_cluster
  mongo2:
    image: mongo:4.4
    command: >
      bash -c "chown mongodb:mongodb /data/keyfile/mongodb-keyfile
      && chmod 600 /data/keyfile/mongodb-keyfile
      && mongod --keyFile /data/keyfile/mongodb-keyfile --replSet my-mongo-set --bind_ip_all"
    volumes:
      - ./mongodb-keyfile:/data/keyfile/mongodb-keyfile
    networks:
      - mongo_cluster
  mongo3:
    image: mongo:4.4
    command: >
      bash -c "chown mongodb:mongodb /data/keyfile/mongodb-keyfile
      && chmod 600 /data/keyfile/mongodb-keyfile
      && mongod --keyFile /data/keyfile/mongodb-keyfile --replSet my-mongo-set --bind_ip_all"
    volumes:
      - ./mongodb-keyfile:/data/keyfile/mongodb-keyfile
    networks:
      - mongo_cluster
  mongo-init-replica:
    image: mongo:4.4
    volumes:
      - ./initiate-replica.js:/scripts/initiate-replica.js
    depends_on:
      - mongo1
      - mongo2
      - mongo3
    entrypoint:
      [
        "bash",
        "-c",
        'while ! mongo --host mongo1 --eval ''db.adminCommand("ping")''; do sleep 5; done && mongo --host mongo1 --eval ''load("/scripts/initiate-replica.js")''',
      ]
    networks:
      - mongo_cluster
networks:
  mongo_cluster:

initiate-replica.js

rs.initiate({
  _id: "my-mongo-set",
  members: [
    { _id: 0, host: "mongo1:27017" },
    { _id: 1, host: "mongo2:27017" },
    { _id: 2, host: "mongo3:27017" },
  ],
});

mongodb-keyfile

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