An engineer's guide to Linux Kernel upgrades
summary
Linux kernel bugfix branches produce weekly bugfix releases; on 5.15 there are ~132 weekly updates with ~50% exceeding 100 commits, 23 >200 and 10 spikes >500 commits, so skipping weeks nonlinearly raises change delta. Real-world upgrade from 5.4 to 5.10 yields ~5GB RAM savings per server. Data shows ~80% of weekly releases patch at least one CVE. Operational advice: roll out in small rebooted batches with metrics-driven canaries, apply bugfix releases with no questions, avoid long soak delays and prefer regular reboots over livepatching.
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chapters (11)
- 0:00Linux kernel upgrades intro
- 2:16Why updates feel risky
- 5:31Risks of skipping upgrades
- 11:56Cost of delaying upgrades
- 15:37Why upgrades are challenging
- 23:29Upgrades safer than they seem
- 27:22Kernel release types
- 31:41Bug fix management
- 34:57When to upgrade major releases
- 37:12Safe upgrade best practices
- 42:12Summary and Q&A
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