Introduction

Validates whether you limit the maximum allowed memory usage for your Kubernetes resources. Limiting memory usage prevents utilizing the all memory, which may cause stability issues for other Kubernetes resources.

Supported Advice States

Action Needed

Automatically discovers whether all Kubernetes container's resources.limits.memory are configured. The discovery is performed by the open-source library kube-score and integrated into this advice.

Validation Needed

Asks you to validate with an automatically created experiment that provided features work as expected, fail gracefully, workload resources scale up or monitoring alerts while consuming a lot of memory.

If the target is associated with a service, the experiment automatically includes a service validation step. This makes it easy to judge whether the service behaves as expected from a user’s perspective.

If you do not use Steadybit’s service feature, you can require the user to provide additional validations via a wizard when creating the experiment. For that, you need to tag your Kubernetes targets with the label tags.steadybit.com/service-validation and one of the following values:

• http: Run an HTTP check on a GET endpoint
• k6: Run a k6 load test
• gatling: Run a Gatling load test
• jmeter: Run a JMeter load test

If none of these options apply, the experiment will include a TODO step prompting you to add custom validation logic for your service.

Implemented

Once the Kubernetes container's specification resources.limits.memory configures a value that was marked as validated.

Disabling Advice

Every advice is automatically active as described in extension-kubernetes#configuration. You can also activate advice individually, using for this advice, the identifier com.steadybit.extension_kubernetes.advice.k8s-memory-limit.