Example of updating a custom bootstrap script for IMDSv2 - AWS ParallelCluster

Example of updating 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.