Adding tags to EBS volumes

1-esb-tags.sh

#!/usr/bin/env bash
set -euo pipefail

# Retrieve the current EC2 instance ID.
declare -r instance_id=$(curl -s http://169.254.169.254/latest/meta-data/instance-id)

# Retrieve the AWS region ID where the EC2 instance is located.
declare -r region_id=$(curl -s http://169.254.169.254/latest/meta-data/placement/availability-zone | grep -Po "(us|ca|ap|eu|sa)-(north|south)?(east|west|central)-[0-9]+")

# Retrieve the volumes attached to the current EC2 instance.
declare -r volumes=$(aws ec2 describe-instances --region "${region_id}" --instance-ids "${instance_id}" --query 'Reservations[*].Instances[*].BlockDeviceMappings[*].Ebs.VolumeId' --output text)

# Retrieve the auto-scaling group name.
declare -r asg=$(aws autoscaling describe-auto-scaling-instances --region "${region_id}" --instance-ids "${instance_id}" --query 'AutoScalingInstances[*].AutoScalingGroupName' --output text)

# Retrieve the tags attached to the auto-scaling group.
declare -r tags=$(aws autoscaling describe-tags --region "${region_id}" --filters Name=auto-scaling-group,Values="${asg}" --query 'Tags[*].{Key:Key,Value:Value}')

# Add all tags retrieved from the auto-scaling group to all EBS volumes attached to the current EC2 instance.
aws ec2 create-tags --region "${region_id}" --resources "${volumes}" --tags "${tags}"

2-esb-policy.json

{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Effect": "Allow",
      "Action": [
        "ec2:CreateTags",
        "ec2:Describe*",
        "autoscaling:Describe*"
      ],
      "Resource": "*"
    }
  ]
}