What is the role and purpose of trial runs in Kubernetes?

Liveness probes (or "probes") in Kubernetes are used to check the health and readiness of pods (containers). The main types of probes:

• Liveness Probe — checks if the container is alive. If the check fails, the container is restarted.
• Readiness Probe — checks if the container is ready to accept traffic. If not, the service does not send requests to it.

Purposes of probes:

• Ensure automatic recovery of applications in case of failures.
• Manage traffic routing only to ready instances.
• Improve the stability and reliability of applications.

Example of probe configuration in a Pod manifest:

livenessProbe:
  httpGet:
    path: /healthz
    port: 8080
  initialDelaySeconds: 15
  periodSeconds: 20
readinessProbe:
  httpGet:
    path: /ready
    port: 8080
  initialDelaySeconds: 5
  periodSeconds: 10

Thus, probes help Kubernetes monitor the state of applications and ensure their stable operation.