AWS Instance Metadata Simulator

This project provides an incomplete capability of simulating AWS EC2 instance metadata. It was created to allow for testing of applications that utilize EC2 instance metadata in non-AWS environments or for testing applications in AWS against different metadata values.

Quick Install

wget https://raw.githubusercontent.com/mtnfog/aws-metadata-simulator/master/install.sh && chmod +x install.sh && ./install.sh
sudo iptables -t nat -A OUTPUT -p tcp -d 169.254.169.254 --dport 80 -j DNAT --to-destination 127.0.0.1:8080

Manual Install Steps

go get -u github.com/mtnfog/aws-metadata-simulator

To run:

If specific values for the instance metadata are desired set those values in metadata.toml then run it:

go run main.go

To use a different file as the configuration give the filename as a command line argument:

go run main.go other.toml

To redirect traffic:

iptables -t nat -A OUTPUT -p tcp -d 169.254.169.254 --dport 80 -j DNAT --to-destination 127.0.0.1:8080

To use:

curl -X GET http://127.0.0.1:8080/latest/meta-data/ami-id

Using

Now when applications make requests to the EC2 instance metadata the simulator will answer. You can test it:

curl http://169.254.169.254/latest/meta-data/hostname

To revert back to EC2's instance metadata service you must remove the iptables rule.