RailwaySignallingTrack CircuitPredictive MaintenanceSafetyAxle Counters vs Track Circuits: How to Choose, and What Breaks in ServiceA practical comparison of axle counters and track circuits for railway train detection — selection criteria, reset procedures, common failure modes, and what to monitor on each. Written from field experience on Indian Railways installations.August 22, 202610 min read
DNSNetworkingTroubleshootingSysAdminDNS Troubleshooting with dig: A Workflow for Real FailuresA systematic dig-based workflow for diagnosing DNS problems — isolating resolver vs authoritative faults, reading NXDOMAIN vs SERVFAIL, tracing delegation, catching stale caches, and debugging split-horizon and DNSSEC failures.August 22, 202610 min read
MQTTIoTSecurityIndustrial IoTProtocolsMQTT Broker Hardening: TLS, Authentication and ACLs on MosquittoA step-by-step guide to securing a Mosquitto MQTT broker — disabling anonymous access, issuing TLS certificates, per-client authentication, and topic-level ACLs that actually restrict what devices can publish and subscribe to.August 22, 20269 min read
CybersecurityLinuxKernelVulnerabilityCVE-2026-43499: Linux Kernel rtmutex Flaw Enables Local Privilege Escalation — Patch NowCVE-2026-43499 is a CVSS 7.8 high-severity flaw in the Linux kernel's real-time mutex (rtmutex) implementation. Learn how the remove_waiter() bug works, which Ubuntu releases are affected, and how to patch your kernel.July 22, 20265 min read
SysAdminNetworkingSecurityLinuxFree SSL with Let's Encrypt and Caddy: Complete Setup Guide for Self-Hosted AppsSet up automatic HTTPS for your self-hosted apps using Caddy and Let's Encrypt — zero manual certificate management. Covers reverse proxy, wildcard certs, internal networks, and real production configs.June 23, 202611 min read
NetworkingVPNVLANSysAdminL2 Tunneling Protocols Explained: GRE, L2TP, VXLAN and When to Use EachA practical guide to Layer 2 tunneling — how GRE, L2TP, and VXLAN work, their differences, real configuration examples on Linux and Cisco, and which to use for different network scenarios.June 22, 202611 min read
IoTSCADANetworkingIndustrialProtocolsModbus TCP Protocol: Complete Guide for Industrial IoT and SCADA IntegrationEverything you need to know about Modbus TCP — how the protocol works, register types, function codes, reading data with Python, and integrating with SCADA and IoT platforms. Real-world industrial examples included.June 21, 202611 min read
NetworkingSNMPRaspberry PiNMSSysAdminRaspberry Pi as a Network Monitor: Complete Setup Guide with SNMP, Grafana & AlertsTurn a Raspberry Pi into a full network monitoring station — polling SNMP devices, storing metrics in InfluxDB, visualizing with Grafana, and sending alerts. Step-by-step with real configs.June 20, 202611 min read
DevOpsKubernetesCloudKubernetes for Beginners: Deploy, Scale & Manage Containers in 2026Learn Kubernetes from scratch — pods, deployments, services, ingress, ConfigMaps, and scaling. A practical guide with real examples to get your first app running on K8s.April 16, 20267 min read
Web DevelopmentReactNext.jsNext.js 15 App Router: The Complete Guide for 2026Master Next.js 15 App Router — from file-based routing and server components to streaming, caching, middleware, and deployment. Everything you need to build modern React apps.April 16, 20268 min read
DevOpsGitDeveloper ToolsAdvanced Git: Rebase, Cherry-Pick, Bisect & Reflog ExplainedGo beyond git add and commit. Learn interactive rebase, cherry-pick, bisect for bug hunting, reflog for recovery, worktrees, and advanced workflows used by professional developers.April 15, 20268 min read
Web DevelopmentCSSFrontendTailwind CSS v4: What's New and How to MigrateEverything you need to know about Tailwind CSS v4 — the new CSS-first configuration, lightning-fast engine, new utilities, container queries, and step-by-step migration from v3.April 14, 20266 min read