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anapsix/aws_metadata_proxy.md

Created December 13, 2017 16:47
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How to proxy EC2 metadata
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aws_metadata_proxy.md

How to proxy to EC2 Metadata

Sometimes, you need to use your EC2 instance's credentials to access the AWS resources, for testing, development, etc.. This is how you do it.

Step 1

create 169.254.169.254 on loopback interface

linux

sudo ip a add 169.254.169.254 dev lo

Mac

sudo ifconfig lo0 alias 169.254.169.254/32 up

Step 2

Proxy to your EC2 server

sudo ssh -N -L169.254.169.254:80:169.254.169.254:80 ${username}@${ec2_intance}

Step 3

If you are using AWS SDK, it should just use the instance metadat that is now available Curl Example:

$ curl 169.254.169.254/latest/meta-data/instance-id
i-0aa4062a456626e34

Docker Example:

$ docker run -it --rm alpine:3.6 wget -qO- 169.254.169.254/latest/meta-data/instance-id
i-0aa4062a456626e34
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