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8-bit-k8s Episode 4: Readiness vs Liveness

Health checks are a fundamental part of Kubernetes, but readiness and liveness probes solve two completely different problems.

A readiness probe determines whether a pod is prepared to accept traffic. If the probe fails, Kubernetes removes the pod from service endpoints, preventing new requests from reaching it while allowing the container to continue running.

A liveness probe determines whether a container is functioning correctly. If the probe fails, Kubernetes assumes the container is unhealthy and restarts it automatically.

Misconfiguring these probes can lead to several issues:

• Healthy containers being restarted unnecessarily
• Traffic being routed to applications that are not fully initialized
• Increased deployment risk and service instability
• Longer recovery times during incidents

The distinction is simple:

Readiness: Can this application serve requests?

Liveness: Should this container continue running?

Understanding the difference between these two probes is one of the first steps toward building resilient and production-ready Kubernetes workloads.

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