CODEWITHSUNDEEP
amazon-web-servicesdockeraws-ecsaws-fargate
Tanmay Bhattacharya
Tanmay Bhattacharya

Reputation: 551

How to make two containers connectable in AWS ECS Fargate?

I have two containers added to a task definition

  1. Node Container:

    name :nodeAPI
port :exposed 5001
mongoconnection string in the env variable : mongodb://mongo  [name of mongo container]

  2. Mongo container:

    name :mongo
port :exposed 27017

The node container is not able to connect to Mongo when I run this task. I am using Fargate and network as awsvpc.

  1. How do I fix this?
  2. How do I make it work running them from separate task definitions?

Upvotes: 4

Views: 4185

Answers (3)

Mangal
Mangal

Reputation: 637

As every task in Fargate gets it own ENI, therefore correct way to communicate between containers in same task definition is calling local loopback 127.0.0.1 or localhost.

For example:

First Container will be able to communicate to second container using 127.0.0.1:<port of second container> as address and second container can communicate to First container using 127.0.0.1:<port of first container>

This is very well explained in AWS Blog: https://aws.amazon.com/blogs/compute/task-networking-in-aws-fargate/

Upvotes: 2

Filip
Filip

Reputation: 123

If both containers are defined within the same "Task Definition" than they are able to communicate using "localhost".

In your example your NodeJs app will talk with mongo localhost:27017

Upvotes: 0

arjunadilan
arjunadilan

Reputation: 1

there's a security-group configuration when you running the task check whether those are open

fargate security groep

fargate acts like a ec2 onlything is you can use a docker image so you have to do normal ec2 configs

Upvotes: 0

Related Questions