Learn how to set up MongoDB Replica Set with Docker Compose. Our MongoDB Support team is here to help you with your questions and concerns.

Set Up MongoDB Replica Set with Docker Compose

If you have run into trouble trying to set up MongoDB Replica Set with Docker Compose, you have come to the right place.
Our experts have put together this guide to help you out.

Start reading to implement a MongoDB ReplicaSet with ease.

Before we begin, let’s take a quick look at MongoDB ReplicaSet:

How to implement MongoDB ReplicaSet with Docker Compose

To implement a MongoDB ReplicaSet using Docker Compose, we’ll focus on a three-node setup. Here is a snippet of the Docker Compose file that defines the network, volumes, and services for our MongoDB containers:

Here, we define a common network for the containers to communicate. The Volumes are created for each MongoDB node to persist data. Furthermore. 3 services are set up, each linked to its respective volume and connected via the common network.

Once we define the Docker Compose file, it is time to start the ReplicaSet. This is done by running a batch file that starts the containers and executes the `rs.initiate()` command:

Additionally, we can make sure the replicaset is started properly by running the rs.status() command on one of the containers.

docker exec -it mongo.one.db mongosh --eval "rs.status()"

If the replicaset was successfully initiated, only one of the containers has the stateStr property set as PRIMARY. Also, the remaining containers are marked as SECONDARY.

Let us know in the comments if you need further help setting up MongoDB ReplicaSet with Docker Compose.

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Conclusion

In brief, our Support Experts demonstrated how to set up MongoDB Replica Set with Docker Compose.