


 Short description
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If you terminate a RUNNING container instance with a connected Amazon ECS container agent, the agent automatically deregisters the instance from your cluster. However, if you terminate a STOPPED container instance with disconnected agents, the container instance isn't automatically removed from the cluster.



 Resolution
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Deregister your container instance in the STOPPED state by using the [Amazon ECS console](https://docs.aws.amazon.com/AmazonECS/latest/developerguide/deregister_container_instance.html) or [AWS Command Line Interface](https://docs.aws.amazon.com/cli/latest/reference/ecs/deregister-container-instance.html).


The deregistered container instance will no longer appear as a resource in your Amazon ECS cluster.


To troubleshoot a disconnected ECS agent see [Why are my Amazon ECS container instances with Amazon Linux 2 AMIs disconnected?](https://repost.aws/knowledge-center/ecs-agent-disconnected-linux2-ami)





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 Related information
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[Amazon ECS container instances](https://docs.aws.amazon.com/AmazonECS/latest/developerguide/ECS_instances.html)


[Installing the Amazon ECS container agent](https://docs.aws.amazon.com/AmazonECS/latest/developerguide/ecs-agent-install.html)


[Launching an Amazon ECS container instance](https://docs.aws.amazon.com/AmazonECS/latest/developerguide/launch_container_instance.html)


[Amazon ECS container agent configuration](https://docs.aws.amazon.com/AmazonECS/latest/developerguide/ecs-agent-config.html)







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