ecs-host

#!/bin/bash
#
# Usage: ./ecs-host profile-name cluster-name service-name
#

display_usage() {
  echo "Retrieve ip address for service name."
  echo -e "\nusage: `basename $0` [-1h] -p profile-name -c cluster-name -s service-name"
}

# if less than two arguments supplied, display usage
if [  $# -le 1 ]
then
  display_usage
  exit 1
fi

# options were specified
while getopts "1hp:c:s:" opt; do
  case $opt in
    1)
      single_output_mode=true
      ;;
    p)
      profile=$OPTARG
      ;;
    c)
      cluster=$OPTARG
      ;;
    s)
      service_name=$OPTARG
      ;;
    h)
      display_usage
      exit 1
      ;;
    \?)
      echo "Invalid option: -$OPTARG" >&2
      exit 1
      ;;
  esac
done

# Script

containerInstanceArns=`(aws ecs list-tasks \
  --profile ${profile} \
  --cluster ${cluster} \
  --query taskArns \
  --max-items 100 \
  --output text \
  | head -1 | \
  xargs aws ecs describe-tasks \
  --profile ${profile} \
  --cluster ${cluster} \
  --query "tasks[]" \
  --tasks) | \
  jq -r ".[] | select(.containers[].name | contains(\"${service_name}\")) | .containerInstanceArn" | tr '\n' ' '`

ec2InstanceIds=`aws ecs describe-container-instances \
  --profile ${profile} \
  --cluster ${cluster} \
  --container-instances ${containerInstanceArns} | jq -r '.containerInstances[].ec2InstanceId'`

ec2PublicIps=`aws ec2 describe-instances \
  --profile ${profile} \
  --instance-ids ${ec2InstanceIds} | jq -r ".Reservations[].Instances[].NetworkInterfaces[].Association.PublicIp"`

if [[ $single_output_mode ]]
then
  ec2PublicIps_array=( $ec2PublicIps )
  echo ${ec2PublicIps_array[0]}
else
  echo $ec2PublicIps
fi