Linux Box Admin

Saturday, 04 April 2026

A single-pass hardening workflow for Ubuntu/Debian cloud instances with copy-paste commands for SSH lockdown, UFW firewall, Fail2ban, automatic security updates, auditd logging, and kernel sysctl tuning.

Friday, 27 March 2026

A practical Linux incident-response runbook for systemd services: first-response triage, fast log analysis, dependency checks, rollback decisions, and prevention notes.

Wednesday, 18 March 2026

A practical 15-minute Linux hardening checklist covering SSH, firewall, updates, fail2ban, users, and audit basics.

Saturday, 14 March 2026

Diagnose and fix Linux services faster with a practical systemd command toolkit for logs, dependencies, restart loops, and startup timing.

Thursday, 12 March 2026

A repeatable weekly workflow for processing Linux security advisories (USNs, DSAs, RHSAs) with command examples for Debian/Ubuntu and RHEL, covering intake, prioritization, staging, rollout, verification, and rollback.

Monday, 09 March 2026

A comprehensive, step-by-step checklist covering SSH hardening, firewall configuration, unattended updates, intrusion detection, audit logging, and more to lock down your Linux servers in 2026.

Monday, 09 March 2026

A hands-on guide to configuring TLS 1.2/1.3 on Nginx with Certbot, OCSP stapling, HSTS headers, HTTP/2, HTTP/3 (QUIC), and automated certificate renewal for production servers.

Tuesday, 10 February 2026

A step-by-step guide to installing Clawdbot using the OpenClaw npm package on Linux, setting it up as a systemd service, and a look at hosted alternatives like Clawly.

Tuesday, 21 March 2006

In Mac OS X, the root account is disabled by default. The conventional wisdom is that sudo is the most secure way to run root commands, but a closer look reveals a picture that is not so clear.

Friday, 22 December 2006

If you have been using MySQL for a while, you have a knowledge investment that may discourage you from exploring other databases. This short guide shows how common tasks in MySQL are accomplished in PostgreSQL.

Wednesday, 10 May 2006

The Nautilus program in GNOME is not only the default file manager, it creates and manages the desktop. While it looks simple on the surface, there is a lot of hidden power under the shell.

Monday, 10 July 2006

One of first culture shocks for people moving from Windows to Linux is the case sensitivity of file names. Today, long file names are well supported by all three operating systems though key differences remain.

Wednesday, 01 August 2007

If you come from the MS Windows world, think a link as a "shortcut" you created on the desktop. If you are not, well, a link gives an easy access to a file or directory from somewhere other than its location, and is a way to help you organize your files.

Saturday, 28 July 2007

All the Linux users know about the "rwx" file permissions. These defines if the people who is the owner/ in the same group/ any other people can read/write/execute the file. However, have you notice some other things in the permission field? Sometimes a "s", sometimes a "t", or "c", "b", "l"... What does this mean?

Thursday, 26 July 2007

I don't think I need to say anything about why we want to use the keyboard over a mouse: All the geeks love it, and it's just more efficiency. However when we come to web visiting, it is not easy to just use our keyboard.

Sunday, 22 July 2007

I don't think I need to say anything about why we want to use the keyboard over a mouse: All the geeks love it, and it's just more efficiency. Today we'll use the full featured Firefox, and make it to be fully comfortable to use with your keyboard.

Wednesday, 18 July 2007

Using GDB is necessary for every C/C++ developer in the Linux world. Though many gurus like the traditional command line, many people want a more integrated interface. At least they don't want to do list all the time.

Tuesday, 10 July 2007

If you have 10+ GUI applications running and spend lots of time dragging them to the right place, you need a tiling window manager.