Date: Thu, 14 Dec 2017 10:19:09 -0800 (PST) From: "Rodney W. Grimes" <freebsd-rwg@pdx.rh.CN85.dnsmgr.net> To: current@freebsd.org Cc: bob prohaska <fbsd@www.zefox.net>, blubee blubeeme <gurenchan@gmail.com>, FreeBSD current <freebsd-current@freebsd.org> Subject: Re: kernel names Message-ID: <201712141819.vBEIJ9fL098153@pdx.rh.CN85.dnsmgr.net> In-Reply-To: <20171214174637.GQ1179@albert.catwhisker.org>
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> On Thu, Dec 14, 2017 at 09:17:36AM -0800, bob prohaska wrote: > > On Thu, Dec 14, 2017 at 01:47:13PM +0800, blubee blubeeme wrote: > > > When you boot into FreeBSD and you can select kernels, there's only 2 > > > options: > > > default and kernel.old > > > > > > Is there a way to have better output and support multiple kernels without > > > having to login to the system and running uname -v or something like that? > > > > > > Would it be possible to add options for more kernels from that boot menu? > > > > Unless I've been fooling myself, it's possible now. Just stop the boot > > loader during loading by hitting the spacebar and type > > boot kernelname > > at the loader prompt > > .... > > As Allan Jude pointed out earlier in the thread, it's a lot easier than > that: just set the "kernels" variable in /boot/loader.conf. > > For example, I update, build, boot, and run FreeBSD on my laptop daily. > That process installs /boot/kernel (after moving the previous one to > /boot/kernel.old). I like to keep a "recent known-working" kernel > around that isn't automagically replaced, so: > > g1-252(11.1-S)[1] grep kernel /boot/loader.conf > # Experiment to see if kernel.save can be an option from the boot menu > kernels="kernel kernel.old kernel.save" > g1-252(11.1-S)[2] > > (And yes, it does work -- verified empirically.) And you can also do an ls /boot while at a loader prompt to see all the kernels you have laying around you might want to choose from. -- Rod Grimes rgrimes@freebsd.org
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