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Lessons (11)

• Pods

  … What a pod is, why it can hold several containers, the pod lifecycle, sidecars and init containers, resource …

• Services & Ingress

  Pods come and go, so how does traffic find them? ClusterIP, NodePort and LoadBalancer Services, cluster DNS, Ingress …

• Deployments, ReplicaSets & Rollouts

  Keep the right number of pods running and ship new versions with zero downtime. Deployments, ReplicaSets, labels and …

• Scaling & Health Probes

  … Four pods at 90% CPU with a 60% target → ceil(4 × 90/60) = 6 pods. 💡 CPU utilisation is …

• Kubernetes Cluster Architecture

  … store 3 Pods (no node yet) S- A: watch: unscheduled pods → pick nodes → bind pod to node 2 …

• ConfigMaps, Secrets & Storage

  Keep configuration out of your images and data safe when pods die. ConfigMaps, Secrets (and how to handle …

• Helm, kubectl Cheat Sheet & Best Practices

  … read-pods, namespace: team-shop } rules: - apiGroups: [""] resources: ["pods", "pods/log"] verbs: ["get", "list", "watch"] --- apiVersion: rbac.authorization …

• Why Kubernetes?

  … one or more containers running together Pods Deployment Keeps N identical pods running; handles rollouts Deployments Service A …

• API Gateway, BFF & Service Discovery

  … Orders"] A[Orders app] <-- PA[🛡️ sidecar proxy] end subgraph PodB["Pod: Payments"] PB[🛡️ sidecar proxy] <-- B …

• Resilience Patterns

  … a network blip, a pod restarting. Retrying often helps, but retrying immediately and all at once can finish …

• Consumers & Consumer Groups

  … membership ( group.instance.id ) avoids rebalances when a pod simply restarts. Consumer lag: the key health metric Lag …