Re: [gentoo-user] Grub set default for next reboot?
On Wed, 6 Dec 2006, Neil Bothwick wrote: grub-set-default only sets it for one boot, so your default, which would sensibly be set to a known working kernel, takes over next time. I still don't see how grub-set-default has any provisions for booting a kernel just once and then automatically causing some other kernel to be booted on subsequent boots. The documentation for grub-set-default makes no mention of this functionality and provides workarounds that wouldn't be necessary if it existed. Is it possible that I'm missing some sort of --once-only option that you can pass to grub-set-default? Based on my reading and on my testing, the only way to get grub to boot a kernel just once as the original poster described is to use each of default saved, grub-set-default, and multiple occurences of savedefault N-- grub-set-default alone can't do the job. If there's a better way to get lilo -R-like behavior in grub, then I'd like to learn it. Could you please provide an example or a link to documentation? There's also a fall back option to specify a kernel to boot in the event of a failure of the default. Maybe your are thinking of savedefault fallback which sets this. I saw that as well, but I don't think I was thinking of that. Anyway, the answer still remains, that with grub-set-default and a suitable configuration, GRUB will do the same as lilo -R. That's the reason I am comfortable using it on a headless server as well as desktops. Agreed completely. Joe -- gentoo-user@gentoo.org mailing list
Re: [gentoo-user] Grub set default for next reboot?
On Tue, 5 Dec 2006, Jakob wrote: I was wondering if there is a way to tell Grub to start another system than the default for the next reboot? On lilo there is the command lilo -R ... whitch tells lilo to use the specified system for the next reboot and than switch back to the default after that. There does not appear to be a quick-and-easy way to get grub to boot an entry in a one-off test run as you described. The Grub info page does describe a hack that you can use that will yield the same result. It's in section 4.3.1 (Booting once-only) of the grub info page, and it can be found at the below URL: http://www.gnu.org/software/grub/manual/html_node/Booting-once_002donly.html#Booting-once_002donly The trick they describe works like this: Instead of configuring grub to boot the first entry: default 0 You configure grub to boot the default entry: default saved ... which you can set with the command grub-set-default. Then, for each of the boot stanzas in grub.conf, you include the savedefault N directive, which resets the default boot entry when the selected item is booted. The effect is that the default boot entry is reset every time Grub boots something. For one-off cases where you only want to boot something once, you manually set it with grub-set-default, and rely on the savedefault N directive in that one-off stanza to reset the grub default immediately after it's selected. Joe -- gentoo-user@gentoo.org mailing list
Re: [gentoo-user] Grub set default for next reboot?
On Tue, 5 Dec 2006 18:12:17 -0500 (EST), Flophouse Joe wrote: On lilo there is the command lilo -R ... whitch tells lilo to use the specified system for the next reboot and than switch back to the default after that. There does not appear to be a quick-and-easy way to get grub to boot an entry in a one-off test run as you described. Yes there is, grub-set-default. It takes a single numeric argument, which overrides the default in menu.lst for the next boot only. -- Neil Bothwick Boss spelled backwards is double-SOB signature.asc Description: PGP signature
Re: [gentoo-user] Grub set default for next reboot?
On lilo there is the command lilo -R ... whitch tells lilo to use the specified system for the next reboot and than switch back to the default after that. There does not appear to be a quick-and-easy way to get grub to boot an entry in a one-off test run as you described. Yes there is, grub-set-default. It takes a single numeric argument, which overrides the default in menu.lst for the next boot only. Really? I included a link to the Booting once-only node of the grub info page in my previous post, and I didn't get that impression from reading it. My interpretation is that grub-set-default-- by itself-- isn't capable of overriding the default boot entry in grub.conf for just one time. Instead, the info page recommends using grub-set-default to set your desired boot entry for the next boot only, and then *also* specifying your normal default with a savedefault directive in each of your boot stanzas in order to reset it to what you really want to boot from next time. It seems like if you used grub-set-default and omitted the savedefault directive from whatever you were booting, grub would never have its default boot entry reset to its normal value. If you used grub-set-default and did nothing else, then you'd always boot the new kernel. On the other hand, if grub-set-default were able to set a for-this-boot-only boot entry by itself, then why would the info page describe this sillier workaround? Joe -- gentoo-user@gentoo.org mailing list
Re: [gentoo-user] Grub set default for next reboot?
On 12/6/06, Flophouse Joe [EMAIL PROTECTED] wrote: On lilo there is the command lilo -R ... whitch tells lilo to use the specified system for the next reboot and than switch back to the default after that. There does not appear to be a quick-and-easy way to get grub to boot an entry in a one-off test run as you described. Yes there is, grub-set-default. It takes a single numeric argument, which overrides the default in menu.lst for the next boot only. Really? I included a link to the Booting once-only node of the grub info page in my previous post, and I didn't get that impression from reading it. My interpretation is that grub-set-default-- by itself-- isn't capable of overriding the default boot entry in grub.conf for just one time. Instead, the info page recommends using grub-set-default to set your desired boot entry for the next boot only, and then *also* specifying your normal default with a savedefault directive in each of your boot stanzas in order to reset it to what you really want to boot from next time. It seems like if you used grub-set-default and omitted the savedefault directive from whatever you were booting, grub would never have its default boot entry reset to its normal value. If you used grub-set-default and did nothing else, then you'd always boot the new kernel. On the other hand, if grub-set-default were able to set a for-this-boot-only boot entry by itself, then why would the info page describe this sillier workaround? Joe -- gentoo-user@gentoo.org mailing list thanks for your help I will try that one. regards jakob
