How do I resolve "the closest matching container-instance container-instance-id encountered error 'AGENT'" error for my service in Amazon ECS?

You can receive this error when the Amazon ECS container agent running on the container instance designated for task placement is disconnected.

Note: If you didn't receive the preceding error message, choose an article based on one of the following error messages that you received:

• [AWS service] was unable to place a task because no container instance met all of its requirements.
• [AWS service] was unable to place a task because no container instance met all of its requirements. The closest matching container-instance container-instance-id has insufficient CPU units available.
  

To resolve this error, try the following troubleshooting steps:

Check your agent logs

1.    Connect to the container instance using SSH.

2.    Check your agent logs at /var/log/ecs/ecs-agent.log.YYYY-MM-DD-HH.

Note: Replace the timestamp with one that's appropriate for your logs.

Verify that the agent is running on the instance

1.    Connect to your EC2 instance using SSH.

2.    To return a list of your containers, run the following command:

Look for a container running with the name ecs-agent. For more information, see Why is my Amazon ECS agent listed as disconnected?

Restart the agent

If you're using the Amazon ECS-optimized AMI, stop and restart the agent with the appropriate command.

For Amazon ECS-optimized Amazon Linux 2 AMIs, run the following command:

For Amazon ECS-optimized Amazon Linux AMIs, run the following command: