Are there any way to get ecs instance metadata?

2
votes

From the running aws ecs instances, can I get the detail about its cluster name and container instance ID?

In EC2, I can run below curl command to get its instance id, do I have similar command in ECS?

curl http://169.254.169.254/latest/meta-data/instance-id
2
amazon-web-servicesmetadataamazon-ecs

2 Answers

1
votes

Answer my own question, in AWS ECS cluster, a daemon is running, you can queue its metadata by below commands

$ curl http://localhost:51678/v1/tasks | python -mjson.tool


$ curl -s http://localhost:51678/v1/metadata | python -mjson.tool

{
    "Cluster": "application-1",
    "ContainerInstanceArn": "arn:aws:ecs:us-east-2:1234567890:container-instance/ee4d3451d-2de3-4180-b1c6-023ed6e8c343",
    "Version": "Amazon ECS Agent - v1.14.1 (467c3d7)"
}

This will be useful if you need to deregister itself from ECS cluster, for example, you use spot instance in ecs cluster.

Refer:

ecs agent introspection

1
votes

Just to echo what @per-cederberg in his comment so it doesn't get buried (and for some free sweet karma 😝), the running container can call http://172.17.0.1:51678/v1/metadata to get the same information.