Setup MongoDB using Docker Compose as single instance (node) replica set

README.md

Don't use in production!!! For development purpose only

1. Create compose.yml file with the following content:

services:
  mongodb:
    image: mongo
    container_name: mongodb
    volumes:
      - mongodb:/data/db
      - ./replica.key:/data/replica.key
    environment:
      MONGO_INITDB_ROOT_USERNAME: ${DATABASE_USER}
      MONGO_INITDB_ROOT_PASSWORD: ${DATABASE_PASSWORD}
    healthcheck:
      test: test $$(echo "rs.initiate().ok || rs.status().ok" | mongosh -u $${MONGO_INITDB_ROOT_USERNAME} -p $${MONGO_INITDB_ROOT_PASSWORD} --quiet) -eq 1
      interval: 10s
      start_period: 5s
    ports:
      - 27017:27017
    command: "--bind_ip_all --keyFile /data/mongo/replica.key --replSet rs0"

  mongo-express:
    image: mongo-express
    container_name: mongo-express
    depends_on:
        mongodb:
            condition: service_healthy
    ports:
      - 8081:8081
    environment:
      ME_CONFIG_MONGODB_ADMINUSERNAME: ${DATABASE_USER}
      ME_CONFIG_MONGODB_ADMINPASSWORD: ${DATABASE_PASSWORD}
      ME_CONFIG_MONGODB_URL: mongodb://${DATABASE_USER}:${DATABASE_PASSWORD}@mongodb:27017/?replicaSet=rs0&w=majority&readPreference=primary&directConnection=true&authSource=admin
    restart: unless-stopped

volumes:
  mongodb:

2. Generate replica key:

openssl rand -base64 756 > replica.key

3. Create .env file with variables:

DATABASE_USER=
DATABASE_PASSWORD=

4. Run

docker compose up -d