[Kubernetes] Pod Health

Kubernetes relies on Probes to determine the health of a Pod container. A Probe is a diagnostic performed periodically by the kubelet on a container.

docs

There are two types of Probes:

1. Livenss Probe

Liveness probes can be used to determine if a Pod is healthy and running as expected

2. Readiness Probe

Readiness probes can be used to determine if a Pod should receive requests

Failed Pod containers are recreated by default (restartPolicy defaults to Always).

What is the way to check Pod health?

ExecAction: Excutes an action inside the container

TSPSockerAction: TCP check against the container's IP address on specified port

HTTPGetAction: HTTP GET request against container

Probes can have the following results:

- Success

- Failure

- Unknown

pods/probe/exec-liveness.yaml 

apiVersion: v1

kind: Pod

metadata:

  labels:

    test: liveness

  name: liveness-exec

spec:

  containers:

  - name: liveness

    image: k8s.gcr.io/busybox

    args:

    - /bin/sh

    - -c

    - touch /tmp/healthy; sleep ; rm -rf /tmp/healthy; sleep

    livenessProbe:

      exec:

        command:

        - cat

        - /tmp/healthy

      initialDelaySeconds:

      periodSeconds:

巴特西

[Kubernetes] Pod Health

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