Containers are ephemeral by default—when a container restarts, all data written to its local filesystem is lost. On the CKAD exam, you must demonstrate how to attach persistent storage to Pods using PVCs and StorageClasses.
Services provide stable IP addresses for ephemeral Pods, Ingress controllers route HTTP/S domain traffic at Layer 7, and NetworkPolicies act as Pod-level firewalls. In this episode, we build production manifests for all three.
Decoupling application code from environment configuration and enforcing security policies is tested extensively on the CKAD exam. You must know how to pass ConfigMaps and Secrets into Pods as environment variables or volume mounts.
Deployments manage ReplicaSets to automate application rollouts and rollbacks. The CKAD exam requires you to perform image updates, scale replicas, track revision history, and execute emergency rollbacks within seconds.
Multi-container Pod patterns allow containers to share storage and network namespaces to extend functionality without modifying application source code. Designing these patterns under time pressure is a core domain of the CKAD exam.
