Am 20.02.2018 um 22:04 schrieb Mantas Mikulėnas:
On Tue, Feb 20, 2018, 21:06 Reindl Harald <h.rei...@thelounge.net
<mailto:h.rei...@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
a lot of other threads here made it clear that there is not much
difference between "daemon-reload" and "daemon-reexec" at all in the
past and i strongly doubt that it's technically possible to seamless
switch from version 27 (the first Fedora GA AFAIK hat version 44) to 237
and keep the system happily running as like nothing has changed without
reboot
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