有没有办法获取ecs实例元数据？

Question

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

Answer 1

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

Answer 2

只是为了回应@per-cederberg在他的评论中的内容，以免被埋没（以及一些免费的甜蜜业力😝），正在运行的容器可以调用http://172.17.0.1:51678/v1/metadata以获得相同的信息。