[kubernates] 005. How to use Probes

startupProbe:
  httpGet:
    path: "/startup"
    port: 8080
  periodSeconds: 5
  failureThreshold: 36
readinessProbe:
  httpGet:
    path: "/readiness"
    port: 8080
  periodSeconds: 10
  failureThreshold: 3
livenessProbe:
  httpGet:
    path: "/liveness"
    port: 8080
  periodSeconds: 10
  failureThreshold: 3

startupProbe

• It sends a check every 5 seconds and stops once it succeeds
• It will attempt up to 36 times
• Setting a low failureThreshold for the startupProbe can lead to infinite reboot loops

readinessProbe

• It sends a check every 10 seconds
• Disconnect traffic after three consecutive failures

livenessProbe

• It sends a check every 10 seconds
• Restart the container after three consecutive failures.

tip

Probes support executing commands instead of using HTTP

readinessProbe:
  exec:
    command: ["cat", "/usr/src/myapp/datasource/postgresql-info.yaml"]
  periodSeconds: 10
  failureThreshold: 3

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