Get AWS ECS cluster instance IPs

get_ecs_cluster_instance_ips.sh

function get_ecs_cluster_instance_ips () {
  local cluster_name=$1
  local container_arns
  local ec2_instance_ids
  # Get container instances
  container_arns=$(aws --output json \
    ecs list-container-instances \
    --cluster "${cluster_name}" | \
    jq '.containerInstanceArns[]' | tr -d '"' | tr "\n" " ")

  # Get EC2 instance ids
  ec2_instance_ids=$(aws --output json \
    ecs describe-container-instances \
    --cluster "${cluster_name}" --container-instances ${container_arns} | \
    jq '.containerInstances[].ec2InstanceId' | tr -d '"' | tr "\n" " ")

  # Get EC2 instance ips
  ec2_instance_private_ips=$(aws --output json \
    ec2 describe-instances \
    --instance-ids ${ec2_instance_ids} | \
    jq '.Reservations[].Instances[].PrivateIpAddress' | tr -d '"')

  echo "Cluster: ${cluster_name}"
  echo ec2_instance_private_ips:
  echo "${ec2_instance_private_ips}"
}