aws ec2 get instance and ami tags and write them to a file. here is the file and the policy for the AWS role needed om the instances

ec2-describe-instances-policy.json

{
    "Statement": [
        {
            "Effect": "Allow",
            "Action": [
                "ec2:DescribeInstances",
                "ec2:DescribeTags"
            ],
            "Resource": "*"
        }
    ]
}

show_ec2tags

#!/bin/bash

# get_ec2tags
# this command outputs ec2 instance tags as an ini format variable set, and exports them as environment variables.
# the tag names are prefixed and uppified.

# Example output:
#INSTANCE_NAME=jbl-instance-tpl
#INSTANCE_ROLE=worker
#INSTANCE_AWS_AUTOSCALING_GROUPNAME=jbl-stack

# you can run this at boot time or with crons, and store the output in a file
# that can be sourced.
# i.e.
# ./get_ec2tags > environment
# you can then do:
# source environment

# adapted by 24hoursmedia from https://dev-ops-notes.com/aws/how-to-put-aws-ec2-tags-to-environment-variables/



REGION=`curl -s http://169.254.169.254/latest/dynamic/instance-identity/document|grep region|awk -F\" '{print $4}'`

uppify () {
 echo $(echo $1 | iconv -t ascii//TRANSLIT | sed -r s/[^a-zA-Z0-9]+/_/g | sed -r s/^-+\|-+$//g | tr a-z A-Z)
}

get_instance_tags () {
	instance_id=$(/usr/bin/curl --silent http://169.254.169.254/latest/meta-data/instance-id)
	echo $(/usr/bin/aws ec2 describe-tags --filters "Name=resource-id,Values=$instance_id" --region=${REGION})
}

get_ami_tags () {
	ami_id=$(/usr/bin/curl --silent http://169.254.169.254/latest/meta-data/ami-id)
	echo $(/usr/bin/aws ec2 describe-tags --filters "Name=resource-id,Values=$ami_id" --region=${REGION})
}

tags_to_env () {
	tags=$1
    prefix=$2
	for key in $(echo $tags | /usr/bin/jq -r ".[][].Key"); do
		value=$(echo $tags | /usr/bin/jq -r ".[][] | select(.Key==\"$key\") | .Value")
		key=$(echo $key | /usr/bin/tr '-' '_' | /usr/bin/tr '[:lower:]' '[:upper:]')
		#export $key="$value"
		uppified_key=$(uppify "$key")
		export $prefix$uppified_key="$value"
		echo $prefix$uppified_key="$value"
	done
}

ami_tags=$(get_ami_tags)
instance_tags=$(get_instance_tags)

tags_to_env "$ami_tags" "AMI_"
tags_to_env "$instance_tags" "INSTANCE_"