Docker Proves Your App Runs. Kubernetes Proves It's Operable.
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Clear distinction between Docker and Kubernetes operability, highly relevant to cloud infrastructure.
Summary
Docker validates local startup, but Kubernetes exposes operability gaps by forcing apps to answer four questions: discoverability by DNS name, resilience to arbitrary restarts, readiness signaling, and identity without local disk. This explains why containers that work with docker run often fail in production clusters, as seen in the classic 2:47 AM scenario where a pod appears healthy but the service is unreachable.