Warren Togami writes: > Janina Sajka wrote: > > > >Should I expect this to work? Is there some other mechanism to boot a > >different kernel just once--on the next boot? > > http://togami.com/~warren/guides/remoteraidcrazies/ > My guide here has an example of using grub's savedefault --default X > --once directives in order to specify a kernel to boot next. It tries > to boot that kernel. If you reboot again, it falls back to the first > listed kernel in grub.conf. > Hmmm, this syntax looks different from that in the grub docs on gnu.org. Thanks for forwarding this. I will study and see what I can do with it. I am precisely in the position of needing to manage a server which I cannot get to physically. Janina > In order to use this type of fallback, you need to move your "known > good" kernel to be in the first position. Then change > /boot/grub/grub.conf so "default=saved". Then savedefault --default X > --once chooses a kernel specified by X, which begins counting at zero. > > I personally use savedefault --default X --once on my dedicated server > where I have no physical access, but I do have remote power cycling > capability. This way I can reboot into an experimental kernel, and > trigger a reboot into the original kernel if it got "stuck" during bootup. > > Another option is to use "panic=X" where X is a number of seconds. This > triggers an automatic reboot if the kernel panics. It doesn't always > work, but might be useful in some cases where you don't have physical > access to the box. I personally don't use panic=X anymore after I > gained remote power cycling capability. > > Warren Togami > wtogami@xxxxxxxxxx > > -- > fedora-devel-list mailing list > fedora-devel-list@xxxxxxxxxx > https://www.redhat.com/mailman/listinfo/fedora-devel-list -- Janina Sajka Phone: +1.240.715.1272 Partner, Capital Accessibility LLC http://www.CapitalAccessibility.Com Marketing the Owasys 22C talking screenless cell phone in the U.S. and Canada--Go to http://www.ScreenlessPhone.Com to learn more. Chair, Accessibility Workgroup Free Standards Group (FSG) janina@xxxxxxxxxxxxxxxxx http://a11y.org -- fedora-devel-list mailing list fedora-devel-list@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/fedora-devel-list
