[systemd-devel] needed steps to get rebootless upgrade

Lennart Poettering lennart at poettering.net
Mon Feb 17 05:50:50 PST 2014

On Mon, 17.02.14 08:16, Vasiliy Tolstov (v.tolstov at selfip.ru) wrote:

> Hi all. I'm very interesting on creating system like cromeos that can
> do upgrade without reboot.

ChromeOS doesn't support reboot-less upgrades. 

> In case of using systemd - what i need to do?
> I have two disk (ramdisk) system1 and system2 that have old (system1)
> and new (system2) filesystems.
> How can i get upgrade system1 with system2?
> As i understand i need to reload each running service to use new
> system2 for it?
> Can somebody says me more detailed steps to get this?

Such reboot-less upgrades are hardly possible. There are large parts of
the system you cannot upgrade during runtime, such as the kernel or
dbus-daemon and other bits. And even if you could replace all these
things, upgrades during runtime between arbitrary versions unlikely
would be well tested, and hence risky business...

Anyway systemd won't help you with this I fear...


Lennart Poettering, Red Hat

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