Create Environment Variables in EC2 Hosts from EC2 Host Tags, just like Beanstalk or Heroku does!

ec2-host-from-tag-to-env-vars.sh

######
# Author: Marcello de Sales ([email protected])
# Description: Create Create Environment Variables in EC2 Hosts from EC2 Host Tags
# 
### Requirements:  
# * Install jq library (sudo apt-get install -y jq)
# * Install the EC2 Instance Metadata Query Tool (http://aws.amazon.com/code/1825)
#
### Installation:
# * Add the Policy EC2:DescribeTags to a User
# * aws configure
# * Souce it to the user's ~/.profile that has permissions
#### 
# Add tags to an EC2 host or Image Profile
# Reboot and verify the result of $(env).

# Loads the Tags from the current instance
getInstanceTags () {
  # http://aws.amazon.com/code/1825 EC2 Instance Metadata Query Tool
  INSTANCE_ID=$(./ec2-metadata | grep instance-id | awk '{print $2}')

  # Describe the tags of this instance
  aws ec2 describe-tags --region sa-east-1 --filters "Name=resource-id,Values=$INSTANCE_ID"
}

# Convert the tags to environment variables.
# Based on https://github.com/berpj/ec2-tags-env/pull/1
tags_to_env () {
    tags=$1

    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:]')
        echo "Exporting $key=$value"
        export $key="$value"
    done
}

# Execute the commands
instanceTags=$(getInstanceTags)
tags_to_env "$instanceTags"

Thank you for the script!

I am having the issue that the script works, but when I run a cron job (even if I include the script), the script still works (I can see the correct values), but the environment variables do not get set. Any ideas? Thank you!

this script works well, but has issues with AWS generated tags.

for example: aws:cloudformation:stack-id

The ":" caused a problem when it is in the string used as the export variable name

Here is the full Key=Value tag pair:

aws:cloudformation:stack-id=arn:aws:cloudformation:us-west-2:634580338419:stack/deployment-pipeline-myfeature/ce1580f0-b3ad-11e8-acae-0a3d4b08165a

This script works when I run it directly from the EC2 instance. It doesn't work for me when I add it as a command to run in the instance's UserData during instance configuration.
Is it possible to run this script from UserData?