Practical tutorials & tools for modern developers.
Practical articles on Docker, Kubernetes, Spring Boot, SQL, and the tools developers use every day.
A fat Docker image slows CI/CD, increases attack surface, and wastes registry storage. Multi-stage builds let you compile or bundle in a full SDK image and ship only the final artefact in a minimal runtime image — often cutting size from 1.2 GB to under 50 MB. We walk through real examples in Node.js, Go, and Java to show exactly how the pattern works and where the gains come from.
Stateless JWT authentication is the standard for modern Spring Boot APIs. This guide covers SecurityFilterChain configuration, token generation, request filtering, and role-based access control — with working code you can drop into your project.
Kubernetes rolling updates replace pods gradually so your service stays available throughout a release. Learn how to configure maxSurge, maxUnavailable, readiness probes, and rollback strategies to ship confidently every time.
Slow queries are one of the most common production bottlenecks. We cover indexing strategies, avoiding full table scans, using EXPLAIN ANALYSE, rewriting correlated subqueries as joins, and more — illustrated with before/after examples.
Replace "it works on my machine" with a one-command dev environment. We build a Compose stack with a Node.js API, PostgreSQL, Redis, and live code reloading — covering volumes, health checks, environment files, and dev/prod override files.
JPA gives you derived queries and entity mapping out of the box; JDBC Template gives you raw SQL control with minimal overhead. This article walks through the trade-offs with benchmarks and real-world use cases to help you choose.
From aliases and auto-complete to --dry-run=client tricks and context switching, these kubectl productivity tips will dramatically cut the time you spend managing clusters from the command line.
Understanding Docker's network drivers unlocks proper container communication, security isolation, and multi-host connectivity. We demystify each driver, explain when DNS resolution works, and show how user-defined bridge networks beat the default.
Hard-coding configuration is an anti-pattern in containerised apps. Learn how to use ConfigMaps for non-sensitive config and Secrets for credentials, injecting them as environment variables or volume mounts — with a note on external secret managers.