MongoDB Replica Set

It is using latest build of image according to your running platform.

A Replica Set of MongoDB running in a Docker container

To run the container, execute the following command:

docker run -d -p 27017:27017 -p 27018:27018 -p 27019:27019 candis/mongo-replica-set

If you prefer, use Docker Compose instead:

docker-compose up -d

version: "3.8"

services:
  mongors:
    image: elitale/mongo-cluster
    ports:
      - 27017:27017
      - 27018:27018
      - 27019:27019
    restart: always

Wait for 30 to 35 seconds in order to properly start all database instances and replica-set initialization.

Configuration

Additionally, you can pass an env variable called HOST when running the container to configure the replica's hostname in docker. By default, it uses localhost.

Once ready, the replica-set can be accessed using the following connection string:

mongodb://localhost:27017,localhost:27018,localhost:27019/?replicaSet=rs0&readPreference=primary&ssl=false

If you're connecting from your host machine, you might need to set a new alias within /etc/hosts:

# /etc/hosts
127.0.0.1 HOST # where HOST is the value passed as env variable to the container