Implementing ReadinessProbe
ReadinessProbe
, along with LivenessProbe
, is an important aspect to master if you want to provide the best possible experience to your end user. We will first discover how to implement ReadinessProbe
and how it can help you to ensure your containers are fully ready to serve traffic.
Why do you need ReadinessProbe?
Readiness probes are technically not part of services, but I think it is important to discover this feature alongside Kubernetes services.
Just as with everything in Kubernetes, ReadinessProbe
was implemented to bring a solution to a problem. This problem is this: how to ensure a Pod is fully ready before it can receive traffic, possibly from a service?
Indeed, Services obey a simple rule: they serve traffic to every Pod that matches their label selector. As soon as a Pod gets provisioned, if this pod's labels match the selector of a service in your cluster, then this service will immediately start forwarding traffic to it. This...