About how to monitor ephemeral storage usage in Fargate

Question

From Apr 30, 2021, Amazon ECS on AWS Fargate allows you to configure the size of ephemeral storage for Tasks. However, I am consider about ways so that I monitor the usage of ephemeral storage . Is there anyway but use a sidecar container to get the storage capacity and send custom metrics to CloudWatch?

Thank you so much!

Accepted Answer

Hi,

As you've mentioned, there's no native CloudWatch metrics of the ephemeral storage usage, the only workarounds i see would be

- Like you said, a sidecar container to grab the metrics
- Embed in your application the capability to push metric asynchronously to CloudWatch API
- Use an external SSM command to list Fargate tasks and use ECS exec capability to fetch the metric for pushing it to CloudWatch. A bit tricky, i must admit. ( for ref: https://aws.amazon.com/blogs/containers/new-using-amazon-ecs-exec-access-your-containers-fargate-ec2/ )

Answer

You can use the "/" partition to determine the amount of free space left in the Fargate task. There's a plan to publish an ephemeral storage/disk utilization metric via container insights by service team but timeline is not clear at this time.

About how to monitor ephemeral storage usage in Fargate

Relevant content