ecs_cluster_instance_ip.sh

#!/bin/bash

set -eu

cluster=''
p=''

usage() {
    echo "Usage: $0 [-c CLUSTER_NAME] [-p AWS_PROFILE]" 1>&2
}

## Get options
while getopts "c:p:h" options; do
    case "${options}" in
        h)
            usage
            exit 0
            ;;
        c)
            cluster=${OPTARG}
            ;;
        p)
            p=${OPTARG}
            ;;
        *)
            echo "unknown option."
            usage
            exit 1
    esac
done

## Validation
if [ -z $cluster ]; then
    echo "please set CLUSTER_NAME with -c option"
    exit 1
fi

if [ -z $p ]; then
    echo "please set AWS_PROFILE with -p option"
    exit 1
fi

declare -a containerInstanceArns

while read -r line; do
    IFS=' '
    containerInstanceArns+=($(echo ${line} | tr -d '"'));
done < <(aws ecs list-container-instances --profile $p --cluster $cluster | jq ".containerInstanceArns[]")

echo container instance arns
for a in "${containerInstanceArns[@]}"; do
    echo "$a"
done

## Get ECS Instance instance IDs
declare -a ec2InstanceIds

for arn in "${containerInstanceArns[@]}"; do
    
    res=$(aws ecs describe-container-instances --profile $p --cluster $cluster --container-instances "$arn" | jq ".containerInstances[] | .ec2InstanceId")
    
    ec2InstanceIds+=($(echo $res | tr -d '"'))

done;

## GET ECS instances private ips
echo "++++++++ RESULT ++++++++"
for x in "${ec2InstanceIds[@]}"; do
    aws ec2 describe-instances --profile "$p" --instance-ids $x | jq  ".Reservations[] | .Instances[] | .PrivateIpAddress"
done