sysadmin horror stories
AlmaLinux, RHEL and friends — ELevate upgrades, SELinux, dual-EFI RAID and the other joys of the EL family.
A real-world AlmaLinux 10 SELinux migration from fully disabled to enforcing on a server running Apache, Remi PHP-FPM, BookStack, a Laravel controller, MariaDB, custom SSH port 65535, cron jobs and custom writable paths — with troubleshooting commands and a practical SELinux cheatsheet.
A real-world, step-by-step AlmaLinux 8 → 9 → 10 in-place upgrade guide using ELevate: backups, Leapp inhibitors, VDO checks, NetworkManager migration, third-party packages, MariaDB, old EL packages, and the post-upgrade cleanup nobody tells you about.
Introduction, or “What Could Possibly Go Wrong” So you have a perfectly good server. Two perfectly good SATA SSDs. A perfectly reasonable desire to mirror them so that when one inevitably dies at 3am on a Sunday, your server keeps running. You’ve done this a hundred times. mdadm, RAID1, /boot on the array, done, beer, … Read more
The problem looks like the device ‘disappears’ from the bus, and becomes inaccessible to the driver. If it happens early – the driver will not load, if it happens later – it may fail with sporadic access errors cat /sys/module/pcie_aspm/parameters/policy grubby –update-kernel ALL –args “pcie_aspm.policy=performance pcie_port_pm=off pcie_aspm=off” dracut -f ethtool -K eno1 tso off gso … Read more