Engineering writeups and incident post-mortems for #sysadmin.
Articles: 4In-depth engineering analysis: Upgrading legacy CentOS 7 workloads to modern Rocky Linux 9 without service interruptions. Practical diagnostics, logs and production configuration.
In-depth engineering analysis: Migrating crontab spaghetti to systemd timers: memory isolation, logs and restart policies. Practical diagnostics, logs and production configuration.
In-depth engineering analysis: Silent network packet drops: NIC RX ring buffer exhaustion under traffic microbursts. Practical diagnostics, logs and production configuration.
A classic war story: why 400 GB of free disk space could not prevent 'No space left on device' when ext4 inode table hit 100% capacity.
