Example of how to update a custom bootstrap script for IMDSv2 - Amazon ParallelCluster
Services or capabilities described in Amazon Web Services documentation might vary by Region. To see the differences applicable to the China Regions, see Getting Started with Amazon Web Services in China (PDF).

Example of how to update a custom bootstrap script for IMDSv2

In the following example, we update a custom bootstrap action script that was used with IMDSv1 for use with IMDSv2. The IMDSv1 script retrieves Amazon EC2 instance AMI ID metadata.

#!/bin/bash
AMI_ID=$(curl http://169.254.169.254/latest/meta-data/ami-id)
echo $AMI_ID >> /home/ami_id.txt

The following shows the custom bootstrap action script modified to be compatible with IMDSv2.

#!/bin/bash
AMI_ID=$(TOKEN=`curl -X PUT "http://169.254.169.254/latest/api/token" -H "X-aws-ec2-metadata-token-ttl-seconds: 21600"` \
         && curl -H "X-aws-ec2-metadata-token: $TOKEN" -v http://169.254.169.254/latest/meta-data/ami-id)
echo $AMI_ID >> /home/ami_id.txt

For more information, see Retrieve instance metadata in the Amazon EC2 User Guide for Linux Instances.