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Ini saya ambil dari jawaban Stackoverflow - Mongo container with a replica set with only one node in docker-compose , setelah seharian mencari dan ga dapat tutorial yang works, jadi saya tulis saja disini.

Kasus

Perlu Mongo Replica tapi ga ada resource (cuma ada 1 server/mau coba di local laptop aja)

Mongo Cluster

  1. Buat Dockerfile, isi dengan
#since i only need mongo5, i didnt test with another version
FROM mongo:5.0
RUN echo "rs.initiate({'_id':'rs-test', members: [{'_id':1, 'host':'127.0.0.1:27017'}]});" > "/docker-entrypoint-initdb.d/init_replicaset.js"
#create key file, it a must!
RUN echo "12345678euysusahbingit" > "/tmp/key.file"
RUN chmod 600 /tmp/key.file
RUN chown 999:999 /tmp/key.file

CMD ["mongod", "--replSet", "rs-withdraw", "--bind_ip_all", "--keyFile", "/tmp/key.file"]
  1. Buat docker-compose.yml
services:
  mongo-replica:
    build: .
    image: mongo-replica
    container_name: mongo-1
    restart: always
    logging:
      driver: none
    ports:
      - 27017:27017
    healthcheck:
      test: test $$(echo "rs.initiate().ok || rs.status().ok" | mongo -u usernameKamu -p passWord --quiet) -eq 1
      interval: 10s
      start_period: 30s
    environment:
      MONGO_INITDB_ROOT_USERNAME: usernameKamu
      MONGO_INITDB_ROOT_PASSWORD: passWord
      MONGO_INITDB_DATABASE: testDB
    deploy:
      resources:
        limits:
          memory: 1G
    networks:
      - mongo-net

networks:
  mongo-net:
    name: mongo-replica-net
  1. Jalankan docker compose up -d
Single Instance Read as Primary

Single Instance Read as Primary