Tag: sysadmin

Linux Audit Log: What's Really Happening on Your Server

auditd logs every system call, file access, and command. Learn ausearch, aureport, and writing audit rules.

Ventoy: Boot Any OS, Any Time

Ventoy turns any USB drive into a multi-boot drive — drop ISOs on it and boot any OS without re-flashing the drive each time.

The sudoers Mistake Everyone Makes Once

Never edit /etc/sudoers directly. One syntax error locks everyone out. Use visudo, understand NOPASSWD risks.

Certificate Expiry: Monitor Before the 3 AM Call

Certs expire silently. Check expiry with openssl, automate renewal checks with cron, get alerts before disaster.

Where Environment Variables Actually Live in Linux

Navigate /etc/environment, ~/.bashrc, ~/.profile, and systemd Environment=. When to use each.

Sticky Bit, Setuid, Setgid: Linux Special Permissions Explained

Understand sticky bit, setuid, and setgid: what they do, how to set them, security implications, and real-world use cases.

Is fail2ban Actually Working? Here's How to Check

Verify fail2ban is protecting you: check jails, test bans, monitor logs, common misconfiguration, and unban IPs when needed.

Diagnosing Slow Linux Boot with systemd-analyze

Use systemd-analyze to find which services are slowing down boot. Fix the bottlenecks.

Docker CMD vs ENTRYPOINT: The Final Answer

CMD and ENTRYPOINT work together. Learn the difference, exec vs shell form, and when to use the combo pattern.

SSHFS: Ditch SCP & Access Remote Files

SSHFS mounts remote filesystems over SSH so you can browse and edit files locally — faster than scp for interactive work.

How to Actually Read `systemctl status` Output

Decode systemctl status: Active state, CGroup processes, recent logs, loaded/enabled state. What each field tells you.

Is Your Linux Server Destroying Its SSD?

Check SSD health, find excessive write patterns, use noatime, move logs to tmpfs to extend lifespan.