Lesson 22 — Upgrade Strategy (dist-upgrade) - bullseye → bookworm → trixie · pre-flight · rollback

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The major upgrade nobody talks about until it bites. Debian release cycle (3y stable + 2y LTS + 3y ELTS paid). Strategic upgrade windows. One major version at a time rule (never skip). 7-step pre-flight checklist (patch current + LVM snapshot + Restic backup + disk space + holds + release notes + maintenance window). The four-phase upgrade (sources → minimal → full inside screen → autoremove + reboot). 8-point post-upgrade verification. FAST (LVM merge, 5min) and NUCLEAR (Restic restore, 30-60min) rollback drills. Fleet upgrades via Ansible with serial:1 + wave deployment.

Release cycle awareness · One-version rule · Pre-flight 7-step · Four-phase upgrade · Verification + rollback · Fleet pattern

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Видео Lesson 22 — Upgrade Strategy (dist-upgrade) - bullseye → bookworm → trixie · pre-flight · rollback канала Dargslan