toilapp

How to setup MongoDB for local development using Docker

In order to use multi-document transactions (=@Transactional annotation) you need to have a replica set mongodb environment setup.

Refer to docker-compose.yml file in the repository:

version: '3.8'

services:
  mongo:
    image: mongo
    hostname: mongo.
    ports:
      - 27017:27017
    networks:
      default:
        aliases:
          - mongo.repl
    volumes:
      - ./db-data:/data/db1
    command:
      - --storageEngine
      - wiredTiger
      - --replSet
      - repl
    depends_on:
      - mongo-2
      - mongo-3

  mongo-2:
    image: mongo
    hostname: mongo-2.repl
    ports:
      - 27018:27017
    networks:
      default:
        aliases:
          - mongo-2.repl
    volumes:
      - ./db-data:/data/db2
    command:
      - --storageEngine
      - wiredTiger
      - --replSet
      - repl

  mongo-3:
    image: mongo
    hostname: mongo-3.repl
    ports:
      - 27019:27017
    networks:
      default:
        aliases:
          - mongo-3.repl
    volumes:
      - ./db-data:/data/db3
    command:
      - --storageEngine
      - wiredTiger
      - --replSet
      - repl

The important part is the command --replSet REPL_NAME. This defines the three mongo services as a replica set of name REPL_NAME. The easiest way to setup the PRIMARY and SECONDARIES is by opening a mongo shell on the database that should become the primary. In the example above it is the mongo image which runs on port 27017. Inside the shell, run following commands:

mongo
rs.initiate()

Now you have successfully created a replica set mongodb environment. The only thing missing is to create a new database in the primary with name toilapp-db.

This can be done again via the mongo shell:

use toilapp-db

For more details refer to:

Official MongoDB Manual

Quillraven/toilapp

toilapp

How to setup MongoDB for local development using Docker