Why Essential: De facto standard for container orchestration in production
📚 Core Components
- Pods: Smallest deployable units
- Deployments: Declarative updates for Pods
- Services: ClusterIP, NodePort, LoadBalancer
- ConfigMaps & Secrets: Configuration management
- Namespaces: Logical isolation & multi-tenancy
- Labels & Selectors: Object grouping
🚢 Workload Resources
- Deployments: Stateless applications
- StatefulSets: Stateful apps (databases)
- DaemonSets: Run on all/selected nodes
- Jobs: Run-to-completion tasks
- CronJobs: Scheduled jobs
- ReplicaSets: Ensure pod replicas
🌐 Networking
- Services: Service discovery & load balancing
- Ingress: HTTP/HTTPS routing (Nginx, Traefik)
- Network Policies: Pod-to-pod firewall rules
- DNS: CoreDNS for service discovery
- Service Mesh: Istio, Linkerd integration
- CNI Plugins: Calico, Flannel, Cilium, Weave
💾 Storage
- Volumes: emptyDir, hostPath, configMap
- Persistent Volumes (PV): Cluster-level storage
- Persistent Volume Claims (PVC): Storage requests
- Storage Classes: Dynamic provisioning
- CSI Drivers: AWS EBS, GCP PD, Azure Disk
- StatefulSet volume management
🔐 Security & RBAC
- RBAC: Role-Based Access Control
- Roles & RoleBindings: Namespace-level
- ClusterRoles: Cluster-wide permissions
- Service Accounts: Pod identity
- Pod Security: SecurityContext, PodSecurityPolicy
- Network Policies: Traffic filtering
- Secrets Encryption: At-rest encryption
� Package Management
- Helm: Package manager for Kubernetes
- Charts: Pre-configured app packages
- Helm Repositories: Chart storage
- Values: Configuration overrides
- Helm Hooks: Lifecycle management
- Kustomize: Template-free customization
�🔧 Advanced Concepts
- Custom Resource Definitions (CRD): Extend API
- Operators: Application-specific controllers
- Admission Controllers: Request validation/mutation
- Init Containers: Pre-start configuration
- Sidecars: Supporting containers in pod
- Pod Disruption Budgets: Availability guarantees
📊 Observability
- Metrics Server: Resource metrics
- Prometheus Operator: Monitoring stack
- Liveness Probes: Container health
- Readiness Probes: Traffic readiness
- Startup Probes: Slow-starting containers
- kubectl logs: Container logs
- kubectl top: Resource usage
⚡ Autoscaling
- Horizontal Pod Autoscaler (HPA): Scale pods
- Vertical Pod Autoscaler (VPA): Adjust resources
- Cluster Autoscaler: Add/remove nodes
- KEDA: Event-driven autoscaling
- Custom metrics-based scaling
🛠️ Essential kubectl Commands
- Get: kubectl get pods/deployments/services
- Describe: kubectl describe pod <name>
- Logs: kubectl logs -f <pod>
- Exec: kubectl exec -it <pod> -- /bin/sh
- Apply: kubectl apply -f <file.yaml>
- Port-forward: kubectl port-forward
- Top: kubectl top pods/nodes
🎯 Deployment Strategies
- Rolling Update: Gradual replacement (default)
- Recreate: Stop all, then start new
- Blue-Green: Two identical environments
- Canary: Gradual traffic shift
- A/B Testing: Feature-based routing
- Rollback strategies
🏗️ Multi-Cluster Management
- kubectl contexts: Manage multiple clusters
- Rancher: Multi-cluster management UI
- Lens: Kubernetes IDE
- k9s: Terminal-based UI
- Kubectx/Kubens: Context switching
- Federation for multi-cluster apps
🎯 Kubernetes Best Practices
- ✅ Use Namespaces - Logical separation for teams/environments
- ✅ Set Resource Limits - Define requests and limits for CPU/memory
- ✅ Use Liveness & Readiness Probes - Ensure app health
- ✅ Implement RBAC - Principle of least privilege
- ✅ Use ConfigMaps & Secrets - Externalize configuration
- ✅ Label Everything - Organize and select resources easily
- ✅ Use StatefulSets for Stateful Apps - Databases, message queues
- ✅ Implement Network Policies - Control pod-to-pod communication
- ✅ Use Helm for Package Management - Standardize deployments
- ✅ Regular Backups - Backup etcd and persistent volumes
🛠️ Essential K8s Tools
kubectl
Helm
k9s
Lens
Kustomize
Kubectx
Stern
Kubeval
Kubernetes Hot
Helm
K9s
Kustomize
🏆 Recommended Certifications
HIGH
Certified Kubernetes Administrator (CKA)
HIGH
Certified Kubernetes Application Developer (CKAD)
📚 Recommended Books
- 📖 "Kubernetes in Action" by Marko Lukša (Manning) - Deep dive
- 📖 "Kubernetes: Up and Running" by Kelsey Hightower (O'Reilly) - Must-read
- 📖 "The Kubernetes Book" by Nigel Poulton - Beginner friendly
- 📖 "Kubernetes Patterns" by Bilgin Ibryam (O'Reilly) - Advanced patterns
- 📖 "Mastering Kubernetes" by Gigi Sayfan (Packt) - Production ready
- 📖 "Production Kubernetes" by Josh Rosso (O'Reilly) - Real-world scenarios
⏱️ Time: 6-8 weeks