Get an Amazon Elastic Beanstalk environment's name from inside one of its instances

EC2-Describe-IAM-policy.json

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

get-eb-env-name.py

#!/usr/bin/env python

import boto.utils
import boto.ec2

iid_doc = boto.utils.get_instance_identity()['document']
region = iid_doc['region']
instance_id = iid_doc['instanceId']

ec2 = boto.ec2.connect_to_region(region)
instance = ec2.get_only_instances(instance_ids=[instance_id])[0]
env = instance.tags['elasticbeanstalk:environment-name']

print(env)

To help other people like me who came from google search, there is another way to perform this from your elasticbeanstalk instances without allowing all ec2:Describe actions

EC2-DescribeTags-IAM-policy.json

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

Get environment name from bash script

get-eb-env-name.sh

#!/bin/bash
set -e

INSTANCE_ID=$(/opt/aws/bin/ec2-metadata -i | awk '{print $2}')
REGION=$(/opt/aws/bin/ec2-metadata -z | awk '{print substr($2, 0, length($2)-1)}')
TAG="elasticbeanstalk:environment-name"

aws ec2 describe-tags \
  --output text \
  --filters "Name=resource-id,Values=${INSTANCE_ID}" \
            "Name=key,Values=${TAG}" \
  --region "${REGION}" \
  --query "Tags[*].Value"

Below, the command line to get the environment name with one liner:

aws ec2 describe-tags \
  --output text \
  --filters "Name=resource-id,Values=$(/opt/aws/bin/ec2-metadata -i | awk '{print $2}')" \
            "Name=key,Values=elasticbeanstalk:environment-name" \
  --region "$(/opt/aws/bin/ec2-metadata -z | awk '{print substr($2, 0, length($2)-1)}')" \
  --query "Tags[*].Value"

Thanks for the refinement, @Melvin-mlp.

For those of you who did find this through Google, there's more detail in my blog article on how to find the name of an Elastic Beanstalk environment from inside one of its instances.