[systemd-devel] Hints for upgrading systemd on a running system

[Mantas Mikulėnas]

On Tue, Feb 20, 2018, 21:06 Reindl Harald <h.reindl at thelounge.net> wrote:

>
>
> Am 20.02.2018 um 20:00 schrieb Paul Menzel:
> > Dear systemd folks,
> >
> > We finally are going to upgrade from a very old systemd version 27 from
> > 2011 to the current systemd v237. (Historical reasons.)
>
> hopefully you have a working backup
>
> > Anyway, I already was told about `systemctl daemon-reexec`, and we got
> > it working.
>
> the "reexec" is misleading because it's not possible to terminate PID1
> and start it again on a running system with a new binary
>

But you don't *have to* terminate pid1 to change the binary – you can just
exec the new one. Hence the "reexec".

It's possible. That's how initramfs works.

> --

Mantas Mikulėnas <grawity at gmail.com>
Sent from my phone
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