Linux Archives - ITNotes

Headless KVM/QEMU Virtualization with Virsh: CLI Virtual Machines and Bridged Networking

October 18, 2026

Deploy lean, headless KVM/QEMU virtual machines on Linux using virsh. Master command-line provisioning, bridge networking, live resource scaling, and serial console troubleshooting.

Linux

Mastering Strace on Linux: System Call Tracing to Debug Hanging Processes and Missing Files

October 17, 2026

Learn how to use strace to troubleshoot unresponsive Linux processes, track down missing configuration files, and pinpoint latency bottlenecks. This guide covers practical syscall tracing techniques, output filtering, and production debugging strategies.

Linux

Master Rsync on Linux: SSH Sync, Bandwidth Tuning, and Incremental Backups

October 17, 2026

Learn how to use rsync for reliable SSH file syncing, bandwidth management, and automated incremental backups using hard links. Includes a ready-to-use production bash script and I/O tuning tips.

Linux

High-Performance Linux VPN Setup with WireGuard: Point-to-Point, Split Tunneling, and Multi-Node Security

October 16, 2026

Eliminate VPN latency and gateway bottlenecks on Linux with WireGuard. Configure point-to-point tunnels, split tunneling, and firewall hardening with verified production benchmarks.

Linux

Mastering Linux PAM: Setting Up SSH 2FA/MFA and Server Login Policies

October 15, 2026

A practical guide to securing Linux logins with PAM. Learn how to combine SSH keys with Google Authenticator TOTP and enforce automated lockouts using pam_faillock.

Linux

Stop Linux Brute-Force Attacks with Fail2ban and Nftables

October 12, 2026

Harden your Linux servers against aggressive SSH brute-force scans. Learn how to configure Fail2ban with Nftables atomic sets for fast O(1) packet drops without CPU bottlenecks.

Linux

Master Linux Traffic Control (tc): Bandwidth Limiting, Latency Emulation, and Packet Loss with Netem and HTB

October 11, 2026

Simulate network instability and enforce strict bandwidth ceilings directly in the Linux kernel. This guide covers tc with Netem for latency and packet loss emulation, and HTB for granular egress shaping.

Linux

Mastering Systemd Timers: The Modern Cron Alternative for Linux Task Scheduling

October 11, 2026

Tired of silent cron job failures and missing logs? Learn how systemd timers provide modern task scheduling on Linux with native dependency checks, persistent missed-run triggers, and centralized journalctl logging.

Linux

High Availability with Keepalived on Linux: Virtual IP and Automated Failover

October 10, 2026

When your primary web node crashes at 2 AM, every second of downtime counts. Here is how to configure Keepalived on Linux with a floating Virtual IP and automated health checks for sub-two-second, seamless failover.

Linux

Mastering Linux Time Synchronization with Chrony: NTP, NTS Security, and Production Troubleshooting

October 10, 2026

Learn how to build a resilient Linux time synchronization architecture using Chrony. This guide walks through configuring NTP client and server roles, hardening time traffic with Network Time Security (NTS), and debugging production clock drift.