
subaud is authored by Court Schuett (he/him). While Court is an AWS employee, opinions and statements on this blog are his own.


Court Schuett


This simple bash script can be used to get the public and private IP addresses of the Tasks within a Fargate Cluster. With the `CLUSTER_NAME` defined as an environment variable, this script will iterate through all of the Tasks in a Cluster and create a `.env` file with both the public and private addresses of the Tasks.

```bash
#!/bin/bash

> taskIps.env

TASK_LIST=$(aws ecs list-tasks --cluster $CLUSTER_NAME)
TASK_ARNS=$(echo "$TASK_LIST" | jq -r '.taskArns[]')

while IFS= read -r TASK_ARN; do
    NETWORK_INTERFACE_ID=$(aws ecs describe-tasks --cluster $CLUSTER_NAME --tasks "$TASK_ARN" --query 'tasks[0].attachments[0].details[?name==`networkInterfaceId`].value' --output text)
    PRIVATE_IP=$(aws ecs describe-tasks --cluster $CLUSTER_NAME --tasks "$TASK_ARN" --query 'tasks[0].attachments[0].details[?name==`privateIPv4Address`].value' --output text)
    PUBLIC_IP=$(aws ec2 describe-network-interfaces --network-interface-ids "$NETWORK_INTERFACE_ID" --query 'NetworkInterfaces[*].Association.PublicIp' --output text)
    TASK_NAME=$(aws ecs describe-tasks --cluster $CLUSTER_NAME --tasks "$TASK_ARN" --query 'tasks[0].containers[0].name' --output text | tr '[:lower:]' '[:upper:]')
    echo "${TASK_NAME}_PUBLIC_IP=$PUBLIC_IP" >> taskIps.env
    echo "${TASK_NAME}_PRIVATE_IP=$PRIVATE_IP" >> taskIps.env
done <<< "$TASK_ARNS"


```

The basic steps involved:

- Get the Tasks in the Cluster
- Get the ARNs of the Tasks
- Loop through the Task ARNs
  - Get the Network Interface ID of the Task using the Task ARN and Cluster Name
  - Get the Private IP using the Task ARN and Cluster Name
  - Get the Public IP using the Network Interface ID
  - Get the Task Name from the Task ARN and Cluster Name
  - Write everything to the the `.env` file

### GitHub Gist

https://gist.github.com/schuettc/5e805ec2ca6c21f9b3af3f9cfa75fade


This simple bash script can be used to get the public and private IP addresses of a Fargate Cluster

Script

Bash script to get ECS Fargate Cluster IP Addresses