replica Set mongo docker-compose

Question

I\'m trying to configure a mongodb replicaSet using docker-compose, but when I stop the master container it seems that it doesn\'t pass to the secondary.

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Answer 1

Update: This does not work! You do need to run rs.initiate()

With MongoDB 4.0, you don't need a 4th container to run a setup script. It is really simple to bring up a replicaSet of 3 containers:

version: "3"
services:
  mongo1:
    hostname: mongo1
    container_name: localmongo1
    image: mongo:4.0-xenial
    expose:
      - 27017
    restart: always
    entrypoint: [ "/usr/bin/mongod", "--bind_ip_all", "--replSet", "rs0" ]
  mongo2:
    hostname: mongo2
    container_name: localmongo2
    image: mongo:4.0-xenial
    expose:
      - 27017
    restart: always
    entrypoint: [ "/usr/bin/mongod", "--bind_ip_all", "--replSet", "rs0" ]
  mongo3:
    hostname: mongo3
    container_name: localmongo3
    image: mongo:4.0-xenial
    expose:
      - 27017
    restart: always
    entrypoint: [ "/usr/bin/mongod", "--bind_ip_all", "--replSet", "rs0" ]

More info here: https://github.com/msound/localmongo/tree/4.0