How to get EC2 instance ID and other metadata

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On an EC2 instance we can retrieve some of it's metadata by using curl. Let's see how

If we use the following curl on an EC2 instance we will be able to see the different metadata we are going to be able to retrieve:

$ curl http://169.254.169.254/latest/meta-data/
ami-id
ami-launch-index
ami-manifest-path
block-device-mapping/
events/
hostname
iam/
identity-credentials/
instance-action
instance-id
instance-life-cycle
instance-type
local-hostname
local-ipv4
mac
metrics/
network/
placement/
profile
public-keys/
reservation-id
security-groups
services/

For example, we can get the instance ID using the following command:

$ curl http://169.254.169.254/latest/meta-data/instance-id
i-0f672e225d382a524

This IP address (169.254.169.254) is a link-local address it's just reachable from the instance and according to AWS documentation we are not going to get billed for HTTP requests used to retrieve instance metadata and user data.


Posted on 24/03/2021

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