Scenario: "Hamburg": Find the AWS EC2 volume

Level: Easy

Type: Do

Tags: json   advent2025  

Access: Email

Description: We have a lot of AWS EC2 instances and EBS volumes, the description of which volumes we have save to a file with: aws ec2 describe-volumes > aws-volumes.json.
One of the volumes attached to an ec2 instance contains important data and we need to identify which instance is attached to (its ID), but we only remember these characteristics: gp3, created before 31/09/2025 , Size < 64 , Iops < 1500, Throughput > 300.

Find the correct instance and put its "InstanceId" into the ~/mysolution file, e.g.: echo "i-00000000000000000" > ~/mysolution

Root (sudo) Access: True

Test: Running md5sum /home/admin/mysolution returns e7e34463823bf7e39358bf6bb24336d8 (we also accept the file without a new line at the end).

The "Check My Solution" button runs the script /home/admin/agent/check.sh, which you can see and execute.

Time to Solve: 30 minutes.