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Guestbook Application: Liveness Probe

In this exercise we will add an liveness probe to the Guestbook application.

What you will learn:

  • Create a Liveness Probe

1. Extend the guestbook application with a liveness probe

Use your existing definition as blueprint for your deployment of the guestbook app and modify it accordingly. (Or use 10 - Livenessprobe/5-example-app-cm-deploy.yaml)

The probe has the following requirements:

  • The type is a http request
  • The port is 8080
  • The path is /list
  • We want to wait 5 seconds before the first probe is run
  • We want to check the service every 5 seconds
  • The service is allowed to have two consecutive failed tests
  • There no additional headers that need to be set
Solution 

$ kubectl create -f "Kubernetes Labs/10 - Livenessprobe/5-example-app-cm-deploy.yaml"


Bonus: 2. Set a wrong port

Now we want see what happens when the probe fails: Set the port to 8081 instead of 8080. Notice the behavior of the pod/scheduler.