feat: ✨ Probes: Readiness & Liveness solution: StartupProbe

A startup probe in Kubernetes is a mechanism to determine if a container has successfully started and initialized. It is particularly useful for slow-starting containers that require additional time to become fully operational. Kubernetes uses the startup probe to monitor the container's initialization process, and once the container passes the startup check, it transitions to liveness and readiness checks, ensuring the application has enough time to initialize before serving traffic.

k8s/deployment.yaml

@@ -17,7 +17,14 @@ spec:
     spec: 
       containers:
         - name: go-http-app
-          image: wesleywillians/hello-go:v5.4 # Probe on port /healthz (+ readiness check: if app is up < 10s it will fail. This way, readiness will only be "ready" when the pod is healthy)
+          image: wesleywillians/hello-go:v5.5 # Probe on port /healthz (+ readiness check: if app is up < 10s it will fail. This way, readiness will only be "ready" when the pod is healthy)
+          startupProbe: # This will BLOCK the readiness and liveness until the StartupProbe is done
+            httpGet: 
+              path: /healthz 
+              port: 8000 # Should be the CONTAINER port
+            periodSeconds: 2
+            failureThreshold: 10
+
           readinessProbe:
             httpGet: 
               path: /healthz