Instructions
The steps to create a docker cluster are as follows.
- Create a Docker network.
- Start three instances 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_1(MongoDB)
Application[Application] -- Write --> MongoDB_1(MongoDB)
MongoDB_1 -- replication --> MongoDB_2
MongoDB_1 -- replication --> MongoDB_3
Create a Docker Network
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| docker network create mongodb-network
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Run MongoDB in docker
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| docker run -d -p 27017:27017 --name mongodb --network mongodb-network mongo:6.0.4 mongod --replSet myReplicaSet --bind_ip localhost,mongodb
docker run -d -p 27018:27017 --name mongodb2 --network mongodb-network mongo:6.0.4 mongod --replSet myReplicaSet --bind_ip localhost,mongodb2
docker run -d -p 27019:27017 --name mongodb3 --network mongodb-network mongo:6.0.4 mongod --replSet myReplicaSet --bind_ip localhost,mongodb3
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Initiate replica set
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| docker exec -it mongodb mongosh --eval "rs.initiate({
_id: \"myReplicaSet\",
members: [
{_id: 0, host: \"mongodb\"},
{_id: 1, host: \"mongodb2\"},
{_id: 2, host: \"mongodb3\"}
]
})"
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Test and verify replica set
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| docker exec -it mongodb mongosh --eval "rs.status()"
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References
