Commands to create local mongo replica set (in PROD databases should be placed on different servers)

Run with MONGO_INITDB_ROOT_USERNAME and MONGO_INITDB_ROOT_PASSWORD

or add admin when database is running without authentication mode on

use admin

db.createUser({
    user: "admin",
     pwd: "password",
    roles:["root"]
 })

Connect to main db container

docker exec -it mongodb bash

Login as a admin

mongo --host mongodb:27017 -u admin -p <password> --authenticationDatabase admin

Check replica set status

rs.status() rs.conf()

Setup replica set config (add secondary database)

config = {
      "_id" : "rsMain",
      "members" : [
        {
          "_id" : 0,
          "host" : "mongodb:27017"
        },
        {
          "_id" : 1,
          "host" : "mongodb2:27017"
        },
      ]
      };

Initialize cluster

rs.initiate(config);

How to connect:

You must use directConnection=true connection option (only for test purpose)

mongodb://user:password@mongodb:27017/on_chain_data?replicaSet=rs0&authSource=on_chain_data&directConnection=true

Properly connection string

mongodb://user:password@<host>:27017/on_chain_data?replicaSet=rs0&authSource=on_chain_data

Additional warnings

When i try to initialize databse using docker compose, the .js scirpt isn't run. No solution found. So i throw away idea to use

volumes:
  - ./docker-entrypoint-replicaset-onedb:/docker-entrypoint-initdb.d

and back to use simple env veriables and then manually enter to docker container and run the scripts to initialize replica set etc.

Helpfull docker compose config from other service

  mongodb:
    image: mongo:5.0.5
    container_name: mongodb
    # environment:
    #   MONGO_INITDB_ROOT_PASSWORD: <pass>
    #   MONGO_INITDB_ROOT_USERNAME: admin
    ports:
      - 27017:27017
    entrypoint:
      - bash
      - -c
      - |
          chmod 400 /etc/mongo/authKey
          chown 999:999 /etc/mongo/authKey
          exec docker-entrypoint.sh "$@"
    command: ["mongod", "--config", "/etc/mongo/mongod.conf", "--replSet", "rs0"]
    logging:
      driver: "json-file"
      options:
        max-size: 100m
        max-file: "3"
    volumes:
      - ./raw_db:/data/db
      - ./mongo_conf:/etc/mongo
    restart: unless-stopped