MongoDB ReplicaSet Dockerfile

A Dockerfile and config for launching a MongoDB contatiner with 3 mongo processes that act as a ReplicaSet. There are config files for each mongo instance that are copied to the container. The shell script handles creation of the data directories and starting mongo.

Notes

It's probably not a good idea to run this setup in production as each mongo instance should be split across different machines. However for a local development environment this fits our needs.

Base Docker Image

• dockerfile/ubuntu

Installation

1. Install Docker.
2. docker build -t="inlight/mongodb-replica-set" github.com/inlight-media/docker-mongodb-replica-set

Usage

Refer to Dockerfile MongoDB for usage notes not specific to ReplicaSet

Create container from image and open ports for ReplicaSet

docker run -itd -p 27017:27017 -p 27018:27018 -p 27019:27019 --name mongodb inlight/mongodb-replica-set

Initiate ReplicaSet

Once the container is running you can initialize the ReplicaSet with the following steps:

• Access shell of container with docker exec -it mongodb bash
• Access mongo shell with mongo
• rs.initiate() to initiate ReplicaSet
• Use the output of previous step to grab the 'me' (hostname of the machine) property to add to ReplicaSet:
  • port 27018: rs.add('9488f884u84:27018')
  • port 27019: rs.add('9488f884u84:27019')
• You can use rs.status() to see if your ReplicaSet has started successfully