Why your disk usage numbers never add up
Disk & Filesystem Management (Du/Df/Lsblk/Fstrim) Why your disk usage numbers never add up 🧩 The Challenge Ever run du on a mount point and compare it to df, only to...
Author: Saket Jain
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Stop waiting for systemd units to tell you they are actually dead
Process & Resource Monitoring (Top/Htop/Ps/Systemd) Stop waiting for systemd units to tell you they are actually dead 🧩 The Challenge Everyone has dealt with a service that says it stopped,...
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Ever try to revoke SSH access across a thousand servers? It sucks. Here’s a better way.
SSH, Remote Access & Zero Trust On Linux Ever try to revoke SSH access across a thousand servers? It sucks. Here’s a better way. Technical Briefing | 9/16/2026 Remember that...
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Stop letting rsync wipe out files when you move to a new backup target
Backup & Recovery (Rsync/Tar/Dd) Stop letting rsync wipe out files when you move to a new backup target 🧩 The Challenge You finally spin up that new backup server and...
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Stop assuming your firewall rules are firing in order
Networking & Firewall (Ss/Netstat/Iptables/Nftables/Curl) Stop assuming your firewall rules are firing in order 🧩 The Challenge Everyone thinks they’ve written a solid iptables rule until the connection stays dead and...
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Force logout of a user session without nuking their account
User & Group Management Force logout of a user session without nuking their account 🧩 The Challenge Dealing with a compromised account or a runaway process that just won’t die...
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Unsticking dpkg when the pre-install script loses its mind
Package Management (Apt/Dnf/Pacman Internals) Unsticking dpkg when the pre-install script loses its mind 🧩 The Challenge You know that heart-stopping moment when a package update hangs indefinitely because a post-install...
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Finding the hidden mount points stealing your capacity
Disk & Filesystem Management (Du/Df/Lsblk/Fstrim) Finding the hidden mount points stealing your capacity 🧩 The Challenge Ever had a drive look completely empty but you can’t write a single file...
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Stop wondering why your app can’t read files it clearly owns
Permissions & Security (Chmod/Chown/ACLs/SELinux/AppArmor) Stop wondering why your app can’t read files it clearly owns 🧩 The Challenge You finally got the permissions set to 644 and the ownership pointing...
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When Your ‘Beefy’ Server is a Secret Slug: Exposing NUMA Traps
Performance Monitoring & Tuning When Your ‘Beefy’ Server is a Secret Slug: Exposing NUMA Traps Technical Briefing | 9/15/2026 You’ve just racked a beast of a server – multiple sockets,...