Prerequisities, install docker and terraform fam, we in 2024...

1. Navigate to terraform directory

run:

terraform init
terraform plan
terraform apply

2. At this point, inside your docker desktop app you should have something like

you can also simply run

docker ps

and get

3. (Optional) Change the number of replicas use this command

terraform apply -var="mongo_replicas_count=<desired-count>"
terraform apply -var="redis_replicas_count=<desired-count>

4. Testing mongoDB connectivity

mongosh --host localhost --port <desired-port>

you should now see a mongoDB shell like this:

5. Testing Redis connectivity

redis-cli -h localhost -p <desired-port>

you should now see a redis shell like this:

6. Verify that the replication set works as expected

for mongo

mongosh --host localhost --port <desired-port>
rs.status()

and you should get the following output...

for Redis

docker exec redis-node-1 redis-cli -a password INFO replication

For reference:

https://www.mongodb.com/resources/products/compatibilities/deploying-a-mongodb-cluster-with-docker