Using Readiness and Liveness Probes to Health Check Containers in Kubernetes

Using Readiness and Liveness Probes to Health Check Containers in Kubernetes

In this example, we are going to use Kubernetes readiness and liveness probes to automatically detect unhealthy containers/applications in order to handle requests appropriately. It helps us providing as reliable service as possible with minimum downtime.

In this example we are going to use Kubernetes readiness and liveness probes to automatically detect unhealthy containers/applications in order to handle requests appropriately. It helps us providing as reliable service as possible with minimum downtime.

Readiness probe

Indicates whether the Container is "fully" ready for accepting traffic to respond to requests.

Readiness probes are designed to let Kubernetes know when your Container is ready to serve traffic. Kubernetes makes sure the readiness probe passes before allowing a Service to send traffic to the Pod. If a readiness probe starts to fail, Kubernetes stops sending traffic to the Pod until it passes. A Pod is considered ready when all of its Containers are ready to accept connections or requests. If a Container is not in ready state, you don't want to kill it, but you don't want to send requests to it either. For example, a Pod takes time to start/restart so in such cases Kubernetes either stops sending traffic to it or just diverts traffic to already running Pod(s) if exists.

When should you use a readiness probe?

If your Container needs to work on loading large data, configuration files, waiting for external server connections or migrations during start up, specify a readiness probe.

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