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15 lines
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Markdown
15 lines
1 KiB
Markdown
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title: "Kexec considered overkill"
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date: 2022-10-23T22:09:27-07:00
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replyURI: "https://community.mojeek.com/t/kexec-boot-a-new-kernel-without-power-cycling/"
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replyTitle: "Kexec: Boot a new Kernel without Power Cycling"
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replyType: "DiscussionForumPosting"
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replyAuthor: "Mike"
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replyAuthorURI: "https://community.mojeek.com/u/mike/"
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---
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Avoid kexec if you don't need it: it opens new vulnerabilities, and is better left disabled for most use-cases. Redundancy and failover should eliminate the need when hosting a typical service. Even without the risks, there are other reasons to reboot: updates to shared libraries, SELinux policies, and init systems often warrant one.
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One use-case that benefits from kexec is pubnix systems with many logged-in users. If you need to apply an unscheduled security patch while causing minimal disruption, then live-patching makes sense.
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With some boot optimization, I can hit 99.9% uptime even if I reboot 2-3 times per week on Fedora. With failover, these reboots should have negligible impact.
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