Linux ops automation, cloud-native, Kubernetes, SRE, DevOps, Python, Golang and related tech discussions.
This guide walks through the architecture of Linux Netfilter, compares iptables and nftables, and provides step‑by‑step commands, migration scripts, best‑practice recommendations, and troubleshooting tips for building a robust, enterprise‑grade firewall on modern Linux distributions.
Loki + Promtail provides a lightweight log aggregation solution that indexes only labels, cutting storage and memory usage to about one‑fifth of ELK, and the article walks through deployment, configuration, best‑practice label design, multi‑tenant setup, performance tuning, and real‑world case studies.
This guide explains how to use Fail2ban on Linux to automatically detect and block brute‑force login attempts for SSH, web authentication pages, APIs, and mail services, covering installation, configuration hierarchy, custom filters, progressive banning, performance‑optimized actions, high‑availability options, and troubleshooting steps.
This guide walks through Redis Sentinel’s architecture, explains subjective and objective down states, details the leader election and failover workflow, shows step‑by‑step configuration of a three‑node Sentinel cluster, client integration in Python and Java, and provides best‑practice recommendations, monitoring metrics, and troubleshooting tips.
This guide explains how to turn a fully built Prometheus monitoring system into a closed‑loop alerting solution by designing layered PromQL rules, configuring Alertmanager routing, grouping, inhibition and silencing, integrating DingTalk and WeChat webhooks, and applying best‑practice performance, security, high‑availability, and troubleshooting techniques.
This guide explains how to design and implement a secure, least‑privilege RBAC model for multi‑team Kubernetes clusters, covering authentication methods, role and binding definitions, concrete YAML examples, CI/CD integration, audit scripts, performance tips, backup and recovery procedures, and common troubleshooting steps.
This article walks through the challenges of scaling Prometheus storage, compares Thanos, Cortex, and VictoriaMetrics, and provides a complete step‑by‑step guide—including hardware requirements, configuration, deployment, tuning, multi‑tenant setup, and troubleshooting—to replace Prometheus local TSDB with VictoriaMetrics for long‑term, high‑performance monitoring.
This guide walks through the problem of fluctuating traffic in Kubernetes, explains the differences between Horizontal Pod Autoscaler (HPA) and Vertical Pod Autoscaler (VPA), and provides step‑by‑step commands, YAML examples, best‑practice recommendations, troubleshooting tips, and monitoring alerts for deploying a production‑grade HPA + VPA solution.
This guide walks through systemd’s architecture, explains each unit type and key directives, and provides a step‑by‑step walkthrough for creating a secure, resource‑limited, production‑grade .service file, including best‑practice configurations for restart policies, logging, timers, socket activation, and security hardening.
Load Average measures the average number of runnable and uninterruptible processes over 1, 5, and 15‑minute windows, differs from CPU usage, and can be misinterpreted—this article explains its kernel calculation, how to assess overload, troubleshoot CPU, I/O, or process‑count issues, and handle container‑specific distortions with cgroup v2 and LXCFS.
