Tag: sysadmin
All the articles with the tag "sysadmin".
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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.
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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.
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The sudoers Mistake Everyone Makes Once
Never edit /etc/sudoers directly. One syntax error locks everyone out. Use visudo, understand NOPASSWD risks.
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Certificate Expiry: Monitor Before the 3 AM Call
Certs expire silently. Check expiry with openssl, automate renewal checks with cron, get alerts before disaster.
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Where Environment Variables Actually Live in Linux
Navigate /etc/environment, ~/.bashrc, ~/.profile, and systemd Environment=. When to use each.
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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.
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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.
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Diagnosing Slow Linux Boot with systemd-analyze
Use systemd-analyze to find which services are slowing down boot. Fix the bottlenecks.
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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.
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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.
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How to Actually Read `systemctl status` Output
Decode systemctl status: Active state, CGroup processes, recent logs, loaded/enabled state. What each field tells you.
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Is Your Linux Server Destroying Its SSD?
Check SSD health, find excessive write patterns, use noatime, move logs to tmpfs to extend lifespan.