[systemd-devel] needed steps to get rebootless upgrade

[H. Peter Anvin]

On 02/17/2014 12:01 PM, Vasiliy Tolstov wrote:
> 2014-02-17 18:40 GMT+04:00 Koen Kooi <koen at dominion.thruhere.net>:
>> If we stretch the definition of 'reboot' a bit, would it be possible to shutdown, jump back into the initramfs, do the updates and jump to the main rootfs again? It assumes you have an initramfs and all your apps will close, but the machine doesn't reboot :)
>>
>> regards,
> 
> Point to not reboot - bring up system faster. In case of pxe i get
> 10-15 sec bios, 5 sec - get ip from dhcp server and get kernel and
> minimal initrd, 10 sec to download full squashfs (debian-live),
> 1min-3min - chef-solo on image to configure.
> If i get to ramfs and get back - i can save about 2-5 min to get working system.
> 

kexec?

	-hpa