Instructions
The steps to create a docker cluster are as follows.
- Start one instance of MongoDB.
- Initiate the Replica Set.
Once you have a MongoDB cluster up and running, you will be able to experiment with it.
How it will look like:
graph LR
Application[Application] -- Read --> MongoDB(MongoDB)
Application[Application] -- Write --> MongoDB(MongoDB)
Create docker compose file
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version: "3.9"
networks:
mongodb-network:
name: "mongodb-network"
driver: bridge
services:
mongodb:
image: "mongo:6.0.4"
container_name: "mongodb"
networks:
- mongodb-network
hostname: "mongodb"
ports:
- "27017:27017"
restart: "always"
entrypoint: [ "/usr/bin/mongod", "--bind_ip_all", "--replSet", "myReplicaSet" ]
mongoinit:
image: "mongo:6.0.4"
container_name: "mongodb_replSet_initializer"
restart: "no"
depends_on:
- mongodb
networks:
- mongodb-network
command: >
mongosh --host mongodb:27017 --eval "rs.initiate({
_id: \"myReplicaSet\",
members: [
{_id: 0, host: \"mongodb\"}
]
})"
Launch it
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docker compose up
Test and verify replica set
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docker exec -it mongodb mongosh --eval "rs.status()"