Mongo Replicas running as Docker containers.

Inspiration and most of code/configuration comes from [this blog post] (http://www.tothenew.com/blog/mongodb-replica-set-using-docker-networking-and-docker-compose/) (Thanks to [Navjot Singh] (http://www.tothenew.com/blog/author/navjot/) -- Author of the post).

Information

• PRIMARY - <DOCKER_MACHINE_IP:27017>
• SECONDARY - <DOCKER_MACHINE_IP:27018>
• SECONDARY - <DOCKER_MACHINE_IP:27019>

Running

• Optional: Build base image: docker-compose build
• Run docker-compose up -d
• Wait for about 1-2 minutes, let nodes come up, and replicas configuration takes place
• Connect to Primary (or master) - mongo <DOCKER_MACHINE_IP:27017> or docker run -it abdul/alpine-mongo:latest mongo <DOCKER_MACHINE_IP:27017>
• [Import] (https://docs.mongodb.com/getting-started/shell/import-data/) or [Insert] (https://docs.mongodb.com/getting-started/shell/insert/) data

Verifying - Failover Situations (if Secondary becomes Primary)

• Stop Primary (master) service - docker-compose stop mongodb-master
• Connect to one of Secondary (slave):
  • mongo <DOCKER_MACHINE_IP:27018> or docker run -it abdul/alpine-mongo:latest mongo <DOCKER_MACHINE_IP:27018>
  • Or, * mongo <DOCKER_MACHINE_IP:27019> or docker run -it abdul/alpine-mongo:latest mongo <DOCKER_MACHINE_IP:27019>
• Verify if data (imported/added earlier on Primary) is available