Viewing Amazon ECS container agent logs - Amazon Elastic Container Service

Viewing Amazon ECS container agent logs

Amazon ECS stores logs in the /var/log/ecs folder of your container instances. There are logs available from the Amazon ECS container agent and from the ecs-init service that controls the state of the agent (start/stop) on the container instance. You can view these log files by connecting to a container instance using SSH.

Note

If you are not sure how to collect all of the logs on your container instances, you can use the Amazon ECS logs collector. For more information, see Collecting container logs with Amazon ECS logs collector .

The ecs-init process stores logs at /var/log/ecs/ecs-init.log.

The ecs-init.log file contains information about the continer agent lifecycle management, configuration, and bootstrapping.

You can use the following command to view the log files.

cat /var/log/ecs/ecs-init.log

Output:

2018-02-16T18:13:54Z [INFO] pre-start
2018-02-16T18:13:56Z [INFO] start
2018-02-16T18:13:56Z [INFO] No existing agent container to remove.
2018-02-16T18:13:56Z [INFO] Starting Amazon Elastic Container Service Agent

You can use the Amazon ECS logs collector for Windows. For more information, see Amazon ECS Logs Collector For Windows on Github.

  1. Connect to your instance.

  2. Open PowerShell and then run the following commands with administrative privileges. The commands download the script and collects the logs.

    Invoke-WebRequest -OutFile ecs-logs-collector.ps1 https://raw.githubusercontent.com/awslabs/aws-ecs-logs-collector-for-windows/master/ecs-logs-collector.ps1
.\ecs-logs-collector.ps1

You can turn on debug logging for Amazon ECS agent and the Docker daemon. This option allows the script to collect the logs before turning on debug mode. The script restarts the Docker daemon and Amazon ECS agent, and then terminates all containers running on the instance. Before running the following command, drain the container instance and moving any important tasks to other container instances.

Run the following command to turn on logging.

.\ecs-logs-collector.ps1 -RunMode debug