Obtain public IP behind running task of Fargate cluster

[jollopre]

When we deploy into Aws carpanta. We create the following resources:

• cluster
• task definition
• service

In order to retrieve the public IP behind the task running in the cluster, we have to perform 3 requests (in strict order):

1. Lists the tasks running in the cluster (e.g. aws-cli ecs list-tasks --cluster <cluster_arn>)
2. Describe a task from a cluster (e.g. aws-cli ecs describe-tasks --cluster --cluster <cluster_arn> --tasks <task_arn>). This permits obtaining the ENI (Elastic Network Interface) id.
3. Retrieve details of an ENI (e.g. aws-cli ec2 describe-network-interfaces --network-interface-ids <eni_id>). This contains the public IP behind the Elastic Network interface attached to the running task.

Once we have obtained the Public IP, we should log into the output the IP in order to reduce the necessity of going to the AWS panel.

[jollopre]

We can explore the different options provided by aws-cli ecs through docker by typing in the terminal: docker run --rm -it -v $PWD/.aws:/root/.aws amazon/aws-cli ecs help