Health Check Kubernetes Node

There are two forms of heartbeats.

Health check kubernetes node. Startup checks ensure that any code that needs to run before an application is ready to receive traffic has been executed. Updates of nodestatus and the lease object. Currently kubernetes won t take any action on the node.

Each node has an associated lease object in the kube node lease namespace. If a container app is no longer serving requests kubelet will intervene and restart the container for example if an application is not responding and cannot make progress because of a deadlock. Health checks can be shallow or deep.

There are four types of health checks in kubernetes. Node problem detector is a daemonset monitoring the node health. It supports some known kernel issue detection now and will detect more and more node problems over time.

Node problem detector is a daemonset monitoring the node health. These probes can check certain files in your containers check a tcp socket or make http requests. The kubelet agent that runs on each node uses the liveness probes to ensure that the containers are running as expected.

The healthz endpoint is deprecated since kubernetes v1 16 and you should use the more specific livez and readyz endpoints instead. Kubernetes provides liveness and readiness probes that are used to check the health of your containers. It supports some known kernel issue detection now and will detect more and more node problems over time.

With exposing health checks endpoints in an application kubernetes can use these endpoints to probe the health of the application. Currently kubernetes won t take any action on the node conditions and events generated by node problem detector. Health checks or probes as they are called in kubernetes are carried out by the kubelet to determine when to restart a container for livenessprobe and used by services and deployments to determine if a pod should receive traffic for readinessprobe.