CI for Node.js Projects with GitHub Actions
Build a CI pipeline for Node.js projects using GitHub Actions including dependency caching, running tests on multiple Node versions, linting, coverage reporting, and optimizing execution time.
File Permissions in Linux: chmod, chown, and umask
Understand how Linux manages file and directory permissions, use chmod, chown, umask correctly, and manipulate POSIX permissions from Java with tests.
Resource requests and limits in Kubernetes
How to declare requests and limits for CPU and memory, their impact on scheduling, QoS, OOMKilled, CPU throttling, and JVM configuration in containers.
S3 in Spring Boot: Secure File Storage and Proper Permission Management
Upload and download files to Amazon S3 using AWS SDK v2, configure permissions with IAM and bucket policies, and share files temporarily using presigned URLs.
Undoing in Git: reset, revert, and restore
Distinguish git restore, git reset, and git revert through practical examples, plus how to rescue commits using reflog and common undoing mistakes.
Writing Good Dockerfiles: Multi-Stage Build for Spring Boot
Use multi-stage builds to separate build and runtime environments, reduce image size, leverage layer caching, and run Spring Boot applications more securely.
IAM: Users, Roles, and Policies Done Right
Learn to distinguish IAM users, roles, policies and write policies following the least-privilege principle, with real JSON examples and Java SDK code.
Kubernetes Ingress: exposing your application to the world
Understand what Ingress is, how it works with Ingress Controller, and how to write Ingress resources to expose Services to the internet via HTTP/HTTPS.
Writing Good Commit Messages in Git
Learn to structure clear commit messages, apply Conventional Commits standard, and automatically validate with commitlint.
AWS Fundamentals: Region, IAM and Key Services
Essential AWS knowledge - region, availability zone, IAM and popular services to start deploying applications.
CI for Java Projects with Maven using GitHub Actions
Set up CI pipeline for Java/Maven projects with GitHub Actions, from build, test, dependency cache to build status badge.
ConfigMap and Secret in Kubernetes: Separating Configuration from Image
Learn how to use ConfigMap and Secret to manage configuration and sensitive data for Spring Boot applications running on Kubernetes, with practical examples.
Docker Basics: Image, Container, and Layer
Learn how Docker images, containers, and layers work through a real example with a Spring Boot application.
Git Basics: commit, branch, and merge
A practical guide to commit, branch, and merge in Git with concrete examples and common mistakes when working in a team.
Git Rebase or Merge? Choose the right strategy for your team
Compare git merge and git rebase with concrete examples. Learn when to use each one and avoid common mistakes when rebasing pushed branches.
GitHub Actions Basics: Workflows, Jobs, and Steps
Learn the structure of workflows, jobs, and steps in GitHub Actions and how to automate building and testing Java projects with Maven.
Kubernetes Basics: Pod, Deployment, and Service
Learn the three foundational building blocks of Kubernetes - Pod, Deployment, Service - through concrete YAML examples and practical kubectl commands.
Linux Commands Every Developer Needs to Know
A collection of essential Linux commands for daily development — from file management, process monitoring, networking to logging — with working examples and how to call them from Java.
Liveness, Readiness, and Startup Probes in Kubernetes
Learn how Kubernetes uses liveness, readiness, and startup probes for self-healing and traffic orchestration, with practical Spring Boot Actuator examples.