Hi Thomas,
I found a bit of time to take a look.
I have forked and created a branch with a demo of how it could work. It's
not meant to be the finished article, but hopefully it shows how some of it
could be achieved.
Things to note:
- Relevant part of NFSROOT config needs to be something like this:
- systemd systemd-sysv libpam-systemd sysvinit-core-
- Because of potential race conditions with starting usual tty services,
I select unused tty for this
- fai on tty11
- fai-maint on tty12
- fai-maint is a systemd service which creates a tty with a root bash
session already logged in. It's just an example of how that kind of thing
could be achieved with systemd.
- Although I tried to make FAI itself still support both SysV and
Systemd, it's hard to do that in the packaging I think, so for this I
dropped SysV support in the packaging.
- You can use the systemd-sysv compatibility layer to create service
units, but that doesn't give as much control over the units [
they are much
more basic ], so native systemd is better.
Please also note I haven't tested this exhaustively, so far I've only used
it with a squashfs image, not an nfs root.
I'd be happy to work with you to create a PR and review it together to try
and integrate it, but I appreciate you may not want to look at this yet.
It seems to be that multi init system packaging could be the trickiest
part, and you may not want to drop SysV support any time soon.
Please take a look and let me know what you think:
https://github.com/ocadotechnology/fai/tree/systemd-support
Cheers,
Just
On Fri, 6 May 2022 at 20:40, Thomas Lange wrote:
> Hi Justin,
>
> I didn't had time to work on this yet. I do not know how to call the
> main fai script from systemd, so its output is shown on the console
> and the input is also read from the console. It must also work that
> the admin can interrupt the fai run via ctrl-C and get an interactive
> shell.
> Does anyone know how to do this?
>
> Currently (using sysv init) the script is started as /etc/init.d/rcS
> and starts some other daemons on demand (for e.g. sshd is only started
> if FAI_FLAGS includes sshd). How do we do this using systemd?
>
>
> > On Fri, 6 May 2022 15:02:30 +0100, Justin Cattle said:
>
> > Hi,
> > I'm just wondering what the current blockers to using systemd in the
> nfsroot are. Are there some things that simply won't work, or is it more
> about reducing complexity by only supporting
> > a single init system, or something else ?
>
>
> --
> best regards Thomas
>
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