Readiness + Liveness

• pod status
• pending - when first created
• creatingContainer - once scheduled

• Running - once all container started

• pod condition : array of true/false. describe pod and check these.

• podScheduled
• initialized
• containersReady
• Ready : all container ready. pod ready

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Readiness

• eg: jenkin pod ready but actual process take additional 15 section to come up.

  • which is confusing. because service can start sending traffic to pod once READY.
  • solution: readiness probe : helps to get actual application/process status

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liveness

• fact:

  • docker run nginx > exited, since no process running
  • k run nginx --image=nginx > exited > re-run > exited > re-run > ....

• container is up in pod, but application is NOT healthy (some code bug)

• liveness probe can be deifined to periodically test if app is healthy.
• developer define defination of healthy.
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