Intent

Verify that Instana alerts you on pods not being ready to accept traffic for a certain amount of time.

Motivation

Kubernetes features a readiness probe to determine whether your pod is ready to accept traffic. If it isn't becoming ready, Kubernetes tries to solve it by restarting the underlying container and hoping to achieve its readiness eventually. If this isn't working, Kubernetes will eventually back off to restart the container, and the Kubernetes resource remains non-functional.

Structure

First, check that Instana doesn't have any critical events for an application perspective. As soon as one of the containers is crash looping, caused by the Steadybit attack crash loop, Instana should detect this via a critical event to ensure your on-call team is taking action.

Environment Example

The Kubernetes deployment checkout consists of two pods. We are attacking one of the two pods by causing a crash loop and waiting for Instana to detect the problem of the crashing pod.

Solution Sketch

• Kubernetes liveness, readiness, and startup probes