Deep dive into Blue-Green Deployment — zero-downtime releases, instant rollback, Kubernetes implementation, database migration compatibility (expand-contract), CI/CD pipeline integration, and comparison with canary and rolling updates.
A complete guide to Continuous Integration and Continuous Deployment (CI/CD) — covering core concepts, the automated pipeline lifecycle, GitHub Actions workflows, triggers, runner architecture, Docker build & security scanning, and production deployment patterns.
Kubernetes configuration management — namespaces, resource quotas, LimitRanges, labels, annotations, taints and tolerations, node affinity, Pod disruption budgets, and production deployment patterns.
Comprehensive guide to zero-downtime deployment strategies — Rolling, Blue-Green, Canary, Shadow, Feature Flags, and A/B Testing — with Kubernetes configs, database migration patterns, observability, and rollback runbooks.
Comprehensive Docker and Kubernetes interview question bank covering containers, images, networking, storage, workloads, services, security, and troubleshooting scenarios.
A complete beginner-to-advanced guide to Docker and Kubernetes — from writing your first Dockerfile to running production-grade microservices on a managed Kubernetes cluster.
Deep dive into Kubernetes Dynamic Admission Controllers — Mutating and Validating Webhooks, AdmissionReview JSONPatch RFC 6902, failurePolicy deadlock prevention, cert-manager TLS, and Policy-as-Code (Kyverno, OPA Gatekeeper).
Deep dive into Externalized Configuration — 12-Factor App principle III, Spring Cloud Config Server with Git backend, hot-reload via Spring Cloud Bus, Kubernetes ConfigMaps/Secrets, HashiCorp Vault, and configuration hierarchy.
Introduction to Push vs Pull deployments, GitOps principles, and an architecture overview of ArgoCD and Flux.
Complete Helm guide — charts, templates, values, release management, chart repositories, creating your own charts, Helmfile, and best practices for managing Kubernetes applications with Helm.
Complete kubectl command reference — get, describe, apply, delete, exec, logs, port-forward, rollout, debug, and every flag you need for daily Kubernetes operations.
Comprehensive guide to eliminating transient 502 Bad Gateway and Connection Reset errors during rolling updates and HPA scale-in using Kubernetes Pod Termination Lifecycle, preStop hooks, and Spring Boot 3 graceful shutdown.
Kubernetes architecture for beginners — control plane components, worker nodes, the API server, etcd, scheduler, kubelet, kube-proxy, and how they work together to run containerised workloads.
Comprehensive guide to Kubernetes networking concepts, including Container Network Interface (CNI), Service Types, Kube-proxy, and Ingress.
Comprehensive guide to microservices design patterns including API Gateway, Circuit Breaker, Service Mesh, Sidecar, Strangler Fig, Bulkhead, and service discovery in Spring Cloud.
The Three Pillars of Observability in Kubernetes — Metrics (Prometheus), Logs (Fluentd/Elasticsearch), and Traces (OpenTelemetry).
Deep dive into Kubernetes Custom Resource Definitions (CRDs) and the Operator Pattern for managing complex stateful applications.
Deep dive into Kubernetes Pods — Pod lifecycle, init containers, sidecar containers, probes, resource requests and limits, environment variables, and multi-container patterns.
Detailed guide to Service Discovery in microservices, comparing Client-side vs Server-side discovery, Spring Cloud Eureka vs Kubernetes CoreDNS/Kube-proxy.
Deep-dive into Service Mesh architecture — Envoy internals, xDS API, mTLS certificate lifecycle, traffic management patterns, observability, Spring Boot integration, and production failure modes for senior engineers.
Kubernetes networking guide — Service types (ClusterIP, NodePort, LoadBalancer, ExternalName), Ingress, DNS, NetworkPolicy, and how traffic flows from the internet to a Pod.
Deep-dive into the Sidecar pattern — Linux namespace internals, Kubernetes native sidecar lifecycle, PgBouncer connection pooling, Vault secrets injection, config hot-reload, Spring Boot integration, and production failure modes for senior engineers.
Kubernetes storage guide — PersistentVolumes, PersistentVolumeClaims, StorageClasses, dynamic provisioning, ConfigMaps, Secrets, and how to inject configuration into Pods.
A comprehensive guide comparing Virtual Machines, Docker, and Kubernetes — starting with ELI5 analogies for beginners and ending with kernel-level deep dives for seniors.
Complete guide to Kubernetes workload resources — Deployments, ReplicaSets, StatefulSets, DaemonSets, Jobs, and CronJobs with rolling updates, rollbacks, and autoscaling.
