AWS ECS tasks are being killed by OOM without leaving any trace-CodePudding

I have an ECS cluster where I place a container that runs as a daemon to monitor all other processes. However, I'm seeing this containers being killed by OOM from time to time without leaving a trace. I just happened to spot one of them being killed. This is causing some log duplication but I wonder if there is a way to trace these restarts because when I look on the ECS Cluster events, there are no information about this tasks being restarted by any means.

I know more from kubernetes so I would say an analogy here. When this happens on kubernetes you would see a RESTARTS counter when you get information from all pods (kubectl get pods) is there any way to find this information on AWS ECS tasks? I'm struggling to find on documentation

I identified the tasks, and also I identified the status of each tasks to gain more information, but I'm unable to find any hint that the process was restarted or killed before.

this is a task detail example

- attachments: []
  attributes:
  - name: ecs.cpu-architecture
    value: x86_64
  availabilityZone: us-east-2c
  clusterArn: arn:aws:ecs:us-west-2:99999999999:cluster/dev
  connectivity: CONNECTED
  connectivityAt: '2023-01-24T23:03:23.315000-05:00'
  containerInstanceArn: arn:aws:ecs:us-east-2:99999999999:container-instance/dev/eb8875fhfghghghfjyjk88c8f96433b8
  containers:
  - containerArn: arn:aws:ecs:us-east-2:99999999999:container/dev/05d4a402ee274a3ca90a86e46292a63a/e54af51f-2420-47ab-bff6-dcd4f976ad2e
    cpu: '500'
    healthStatus: HEALTHY
    image: public.ecr.aws/datadog/agent:7.36.1
    lastStatus: RUNNING
    memory: '750'
    name: datadog-agent
    networkBindings:
    - bindIP: 0.0.0.0
      containerPort: 8125
      hostPort: 8125
      protocol: udp
    - bindIP: 0.0.0.0
      containerPort: 8126
      hostPort: 8126
      protocol: tcp
    networkInterfaces: []
    runtimeId: 75559b7327258d69fe61cac2dfe58b12d292bdb7b3a720c457231ee9e3e4190a
    taskArn: arn:aws:ecs:us-east-2:99999999999:task/dev/05d4a402ee274a3ca90a86e46292a63a
  cpu: '500'
  createdAt: '2023-01-24T23:03:22.841000-05:00'
  desiredStatus: RUNNING
  enableExecuteCommand: false
  group: service:datadog-agent
  healthStatus: HEALTHY
  lastStatus: RUNNING
  launchType: EC2
  memory: '750'
  overrides:
    containerOverrides:
    - name: datadog-agent
    inferenceAcceleratorOverrides: []
  pullStartedAt: '2023-01-24T23:03:25.471000-05:00'
  pullStoppedAt: '2023-01-24T23:03:39.790000-05:00'
  startedAt: '2023-01-24T23:03:47.514000-05:00'
  startedBy: ecs-svc/1726924224402147943
  tags: []
  taskArn: arn:aws:ecs:us-west-2:99999999999:task/dev/05d4a402ee274a3ca90a86e46292a63a
  taskDefinitionArn: arn:aws:ecs:us-west-2:99999999999:task-definition/datadog-agent-task:5
  version: 2

CodePudding user response：

I don't think ECS tracks or exposes a restart counter for tasks. If you want to be notified of tasks restarting you can create an Event Bridge subscription.

CodePudding user response：

You can use ECS Event with EventBridge and add any action like logging when such event happen.