12/03/2026
🚀 Liveness vs. Readiness: Why Your K8s Pods Keep Restarting?
Setting up a Kubernetes deployment is easy; keeping it healthy is the hard part. The secret lies in understanding your Probes. If you mix these up, you’ll either have a service that never starts or one that restarts in an infinite loop.
1. Liveness Probe (The "CPR" Probe) 💓
Question: Is the app alive or "brain dead"?
Failure Action: Kubernetes kills the container and starts a new one.
Best for: Recovering from deadlocks or infinite loops where the process is running but doing nothing.
2. Readiness Probe (The "Gatekeeper" Probe) 🚦
Question: Is the app ready to do work?
Failure Action: Kubernetes stops sending traffic to the pod but keeps it running.
Best for: Large startups (loading 1GB of cache), heavy traffic spikes, or when a dependency (like a DB) is temporarily down.
💡 Pro-Tip: Never point your Liveness probe at an external dependency (like a database). If the DB goes down, the Liveness probe will fail, and K8s will restart every single pod in your cluster—making a bad situation much worse!
🚀 Liveness vs. Readiness: Why Your K8s Pods Keep Restarting? Setting up a Kubernetes deployment is easy; keeping it healthy is the hard part. The secret lies in understanding your Probes. If you mix these up, you’ll either have a service that never starts or one that restarts in an infinite loo...