On Mon, 20 Oct 2014 11:13:38 +0100 Darac Marjal <mailingl...@darac.org.uk> wrote:
> On Sun, Oct 19, 2014 at 10:36:23PM +0200, Jimmy Thrasibule wrote: > > Hello, > > > > I wonder if one can avoid a complete reboot of the system just by > > halting the operating system but right after load the initramfs and > > restart from there? > > I don't think you can quite do what you're thinking, but there are > other ways around it. > > > > > Basically when we reboot, we only want to reset the operating system > > state but rarely to do all the hardware checks again. And for a > > kernel update, there is kexec. > > If you've got as far as halting the system, then kexec or a full > reboot are your only options. This is due to the fact that you've > unmounted all the block devices, probably powered them off and so > on. I guess you could try jumping back into an initramfs (that you > loaded into memory before shutdown), but you might as well reset > the kernel at that point. It'll only take a few seconds more. > > The other alternative, for a "lighter" reboot is to drop to > runlevel 1 (or single-user.target, in systemd's parlance). This > will stop all the mutli-user services (X, httpd, sshd and so on) > and bring you to a point where only a minimal number of services > are running (file systems are mounted, the local console is > active and so on). You could use "checkrestart" (from the > debian-goodies package) to check what remaining services are using > outdated libraries and restart them manually. At this point, you can > come back up to runlevel 2-5 (systemd: multi-user.target) in order to > bring the system back up to full capacity. > > I think it depends on what you're trying to achieve and what > you're trying to avoid. Windows 8 achieves fast shutdown and boot times by what is basically a partial hibernation, but of the system only. Since the shutdown is fast, I assume the dynamic initrd is prepared much earlier, and kept updated from time to time. -- Joe -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org Archive: https://lists.debian.org/20141020122735.127c1...@jresid.jretrading.com
