What to know

• ngrok published an in-depth technical guide to Kubernetes probes with 100,000+ lines of ported Kubernetes code running as an interactive browser simulator.
• The post covers three probe types—startup, readiness, and liveness—and demonstrates how they prevent failed requests and restart loops in containerized applications.
• The author claims to have discovered a bug in Kubernetes while verifying the demos against k3s.

“Probes are periodic checks sent to containers to determine their health. They come in three flavours: Startup probes determine whether my application inside the container has started. Readiness probes determine whether my application is ready to receive traffic. Liveness probes determine whether my application needs to be restarted.”

ngrok author · ngrok blog

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