Notes, experiences and tutorials on programming, databases and technology.
A complete, practical guide to managing secrets with HashiCorp Vault: history, the move to BSL, OpenBao and IBM’s acquisition of HashiCorp, seal/unseal and Raft, tokens and policies, AppRole and Kubernetes, dynamic secrets, PKI and Transit, a Docker Compose setup with TLS, Spring Boot integration and a production checklist.
A complete, plain-language guide to proxy servers: forward, reverse and transparent proxies, HTTP and SOCKS, load-balancing algorithms, and a full Nginx tutorial covering installation, configuration structure, reverse proxying, SSL with Let's Encrypt, WebSocket, caching, rate limiting, security headers and troubleshooting 502 and 504 errors.
A complete, practical guide to WSO2: the company and its products, the architecture of API Manager 4.7, installation with Docker and Docker Compose, configuring deployment.toml, SSL with Let's Encrypt and Nginx, production deployment tips and a comparison with competitors.
How to set up Call of Duty 4: Modern Warfare for LAN play: installing the multiplayer patches in the right order, entering your CD key, hosting or joining a local server, and connecting from the console.
A step-by-step fix for the VMware Workstation incompatibility with Hyper-V and Device/Credential Guard: disabling virtualization-based security (VBS) in Group Policy, turning off Hyper-V and Memory Integrity, the registry method for Windows Home, and updating VMware.
What enterprise resource planning (ERP) is, its benefits and drawbacks, why so many ERP projects fail, and how to choose between domestic and foreign ERP packages.
A complete guide to Google Bigtable: from Google’s 2006 paper and the tablet and SSTable architecture to the Cloud Bigtable service, comparisons with BigQuery, Spanner and Firestore, and the latest changes from 2024 to 2026.
Planning a new Oracle-based system or modernizing an old Forms 6i application? A side-by-side look at the strengths and weaknesses of Oracle ADF and Oracle Forms Builder.
A JavaBean is simply a convention: private properties with getters and setters, a public no-argument constructor and Serializable — here is what that means and why it matters.
