Is it possible to kexec on demand (not panic!) into another kernel with the idea being to avoid a reboot? For instance, say you had Linux running in a ramdisk, and all that ramdisk Linux did was lay down a bootable Linux image onto the main disk, and then awaited a command to kexec to the Linux image on disk? Is something like that possible? Would I still need to specially craft the initrd? If so, is there any literature available on how to do that? Thanks, Clif Houck On 2/10/2017 9:43 AM, Petr Tesarik wrote: > On Fri, 10 Feb 2017 10:14:02 +0200 > Denys Fedoryshchenko <nuclearcat at nuclearcat.com> wrote: > >> Hello, >> >> After years of using kexec and recent unpleasant experience with modern >> (supposed to be blazing fast to boot) hardware that need 5-10 minutes >> just to pass POST tests, >> one question came up to me: >> Is it possible anyhow to execute regular (not special "panic" one to >> capture crash data) kexec on panic to reduce reboot time? > > No. But you can load a specially crafted panic initrd which kexec's > back to the production kernel. > > HTH, > Petr T > > _______________________________________________ > kexec mailing list > kexec at lists.infradead.org > http://lists.infradead.org/mailman/listinfo/kexec >
