'Using IMDS (v2) with token inside docker on EC2 or ECS

I'd like to use IMDSv2 inside a container running on an EC2 instance.

I want to use the tokens because they are required in my metadata options:

metadata_options {
  http_tokens   = "required"
  http_endpoint = "enabled"
}

Calling the API from the EC2 instance returns my token as expected.

curl -s -X PUT "http://169.254.169.254/latest/api/token" -H "X-aws-ec2-metadata-token-ttl-seconds: 21600"

However, if I try to call it from a docker container:

docker run -it curlimages/curl sh
/ $ curl -X PUT "http://169.254.169.254/latest/api/token" -H "X-aws-ec2-metadata-token-ttl-seconds: 21600"
curl: (56) Recv failure: Connection reset by peer

I just have a timeout.

According to this answer, it should work out of the box, but it's not. If I add a --network=host flag, it works, but that's not a solution for me.

Thanks



Solution 1:[1]

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Solution 1 EM4D