Amazon AWS Elastic Beanstalk - connect to mongodb

Question

I have a node.js app running on aws elastic beanstalk with a load balancer. Currently, I only have one instance running and it can connect to a mongo database instance because I have opened up a port using eb instance internal ip address.

However, as I spin up more nodes on eb, they will have different/new internal ip addresses. What is the best way to allow/open the ports for these new instances?

Answer 1

I recommend using VPC for that. You will place your node servers in zone 1 and mongo instance(s) in zone 2. You then allow zone 1 to access mongo port in zone 2. Elastic Beanstalk will spin up instances only in zone 1, so any internal IP assigned to them will be ok for that configuration, and no one from the www can access mongo.
http://docs.aws.amazon.com/elasticbeanstalk/latest/dg/AWSHowTo-vpc.html