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AWS EC2 Metadata Service v2 uses session tokens:

Basic flow: obtain a session token with a PUT request
IMDSv2_TOKEN=$(curl -X PUT -H "X-aws-ec2-metadata-token-ttl-seconds: 30" -sL 
"http://169.254.169.254/latest/api/token";)
IMDSv2_HEADER="-H X-aws-ec2-metadata-token:${IMDSv2_TOKEN}"

Send the session token when querying
curl -fs $IMDSv2_HEADER http://169.254.169.254/latest/.../

** Affects: cloud-utils (Ubuntu)
     Importance: Undecided
         Status: New

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ec2metadata doesn't support AWS EC2 IMDSv2
https://bugs.launchpad.net/bugs/1882389
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