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Amazon EC2 Container Service
Developer Guide (API Version 2014-11-13)

Agent Introspection Diagnostics

The Amazon ECS agent introspection API can provide helpful diagnostic information. For example, you can use the agent introspection API to get the Docker ID for a container in your task. You can use the agent introspection API by connecting to a container instance using SSH. For more information, see Connect to Your Container Instance.

The below example shows two tasks, one that is currently running and one that was stopped.

Note

The command below is piped through the python -mjson.tool for greater readability.

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

Output:

  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100  1095  100  1095    0     0   117k      0 --:--:-- --:--:-- --:--:--  133k
{
    "Tasks": [
        {
            "Arn": "arn:aws:ecs:us-west-2:aws_account_id:task/090eff9b-1ce3-4db6-848a-a8d14064fd24",
            "Containers": [
                {
                    "DockerId": "189a8ff4b5f04affe40e5160a5ffadca395136eb5faf4950c57963c06f82c76d",
                    "DockerName": "ecs-console-sample-app-static-6-simple-app-86caf9bcabe3e9c61600",
                    "Name": "simple-app"
                },
                {
                    "DockerId": "f7f1f8a7a245c5da83aa92729bd28c6bcb004d1f6a35409e4207e1d34030e966",
                    "DockerName": "ecs-console-sample-app-static-6-busybox-ce83ce978a87a890ab01",
                    "Name": "busybox"
                }
            ],
            "Family": "console-sample-app-static",
            "KnownStatus": "STOPPED",
            "Version": "6"
        },
        {
            "Arn": "arn:aws:ecs:us-west-2:aws_account_id:task/1810e302-eaea-4da9-a638-097bea534740",
            "Containers": [
                {
                    "DockerId": "dc7240fe892ab233dbbcee5044d95e1456c120dba9a6b56ec513da45c38e3aeb",
                    "DockerName": "ecs-console-sample-app-static-6-simple-app-f0e5859699a7aecfb101",
                    "Name": "simple-app"
                },
                {
                    "DockerId": "096d685fb85a1ff3e021c8254672ab8497e3c13986b9cf005cbae9460b7b901e",
                    "DockerName": "ecs-console-sample-app-static-6-busybox-92e4b8d0ecd0cce69a01",
                    "Name": "busybox"
                }
            ],
            "DesiredStatus": "RUNNING",
            "Family": "console-sample-app-static",
            "KnownStatus": "RUNNING",
            "Version": "6"
        }
    ]
}

In the above example, the stopped task (090eff9b-1ce3-4db6-848a-a8d14064fd24) has two containers. You can use docker inspect container-ID to view detailed information on each container. For more information, see Amazon ECS Container Agent Introspection.