GitHub Actions vs GitLab CI Pricing Comparison: Real-World Calculations Across 3 Scenarios
We compare GitHub Actions and GitLab CI by calculating actual monthly bills across three scenarios—5,000, 20,000, and 100,000 minutes. The post also covers the self-hosted runner break-even point, migration checkpoints, and a decision table
Kubernetes NetworkPolicy: A Hands-On Guide to Zero Trust Service Communication Control
A complete, practice-oriented guide to Kubernetes NetworkPolicy that closes security gaps in MSA environments at the root. It covers core principles, Ingress/Egress YAML implementation, and a Default Deny strategy based on least privilege.
SLOs and Error Budgets in SRE: How to Balance Release Speed and Reliability
Does locking down service reliability still feel vague? This guide unpacks SRE’s core principles along with SLOs, SLIs, and Error Budgets using practical examples, and gives you a concrete, measurement-driven roadmap for balancing developme
Kubernetes Ingress Controller: Nginx vs Traefik — A Practical Guide to Choosing the Right One for Your Environment
A deep technical comparison of Nginx Ingress and Traefik, covering auto-discovery, rate limiting, and other core features. Includes selection criteria aligned with your team's operating philosophy and practical tuning tips.
From Diagnosing MSA Performance Bottlenecks to Caching Strategies: A Distributed System Optimization Roadmap
An in-depth, data-driven guide to diagnosing the root causes of slowness in MSA environments. It presents a practical roadmap for optimizing distributed system performance—from monitoring with Prometheus and Jaeger, through Cache-Aside vs.
From Terraform to K8s: A Practical End-to-End DevOps CI/CD Roadmap (IaC & GitOps)
Learning individual technologies isn't enough. This guide walks through a practical, step-by-step roadmap: laying the infrastructure foundation with Terraform, deploying applications with Kubernetes, and completing the full CI/CD pipeline w
CI/CD Pipeline Speed and Cost: A Complete FinOps-Based Optimization Roadmap
Slow CI/CD pipelines slow development and drive up cloud costs. This guide combines caching strategies, test parallelization, and FinOps principles to maximize pipeline performance and cut unnecessary cloud spend.
DNS Troubleshooting Guide for Service Outages: A 10-Step Practical Checklist
When a web service is unreachable, DNS is often the most likely cause. This guide covers how DNS works and a staged diagnostic flow across clients, resolvers, and authoritative servers—including dig usage and TTL management—so you can syste
How to Fix the Helm "another operation in progress" Error (Pending Lock)
Is your deploy stuck on Helm's "another operation in progress" error? Diagnose with helm history, unlock via helm rollback or deleting the pending Secret, and prevent recurrence with --atomic—copy-paste commands included.
How to Perfectly Diagnose K8s 'Forbidden' Errors in 5 Steps: From RBAC to ServiceAccounts
We systematically analyze the root causes of Kubernetes 'Forbidden' permission errors—from AuthN/AuthZ concepts through RBAC, ServiceAccounts, and Secret management. Use this practical 5-step debugging checklist to build reliable K8s operat
Small-Team Log Stack Selection Guide: Loki vs ELK — Cost and Performance Comparison
Struggling with the high operating costs and complexity of the ELK stack? This guide compares Loki and ELK with real measurements across resources, cost, and performance, and lays out a decision roadmap for choosing the right log stack for
Fixing nginx 504 Gateway Timeout: proxy_read_timeout and Upstream Timeouts
A practical guide to pinpointing nginx 504 Gateway Timeouts by where they occur, then fixing them with copy-paste examples for proxy_read_timeout, gunicorn and php-fpm upstream timeouts, and aligning timeouts across multi-hop proxies like A