<div dir="ltr"><div dir="ltr"><br></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">Le jeu. 18 juin 2020 à 12:44, Ulrich Windl <<a href="mailto:Ulrich.Windl@rz.uni-regensburg.de">Ulrich.Windl@rz.uni-regensburg.de</a>> a écrit :<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">>>> Jérémy ROSEN <<a href="mailto:jeremy.rosen@smile.fr" target="_blank">jeremy.rosen@smile.fr</a>> schrieb am 18.06.2020 um 11:01 in<br>
Nachricht<br>
<19710_1592470931_5EEB2D93_19710_59_1_CAFvCimXJwvDg0+5W11H0pUh+EHDTGxgbAuAGpG2PL<br>
<a href="mailto:gjC0iX7A@mail.gmail.com" target="_blank">gjC0iX7A@mail.gmail.com</a>>:<br>
> Le jeu. 18 juin 2020 à 08:53, Ulrich Windl <<br>
> <a href="mailto:Ulrich.Windl@rz.uni-regensburg.de" target="_blank">Ulrich.Windl@rz.uni-regensburg.de</a>> a écrit :<br>
> <br>
>> Hi!<br>
>><br>
>> I have a question: systemd monitors almost everything it seems to me. So I<br>
>> wonder:<br>
>> Under what conditions is it necessary to issue a daemon-reload, and why<br>
>> can't systemd find out itself that a daemon-reload is required?<br>
>><br>
> <br>
> There are some cases where systemd can detect the proper time for a<br>
> daemon-reload, and does it implicitely<br>
> systemd also check mtime of configuration files so it can see when a<br>
> daemon-reload should be done.<br>
<br>
Is there something like "systemd suggests daemon-reload" (assuming systemd<br>
detects the situation, but does not issue a reload itself)?<br>
<br></blockquote><div>Not that I know of...</div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
> <br>
> However it is not because a file has been modified that systemd should<br>
> decide to reload by itself.<br>
> multiple unit files need to work together to make a working environment,<br>
> and systemd can't know when all changes are consistent and<br>
> it is safe to reload. So systemd will want an explicit order from the user.<br>
<br>
I see (see above).<br>
<br>
> <br>
> So if I think a "manual" daemon-reload is required, is it safe to do it<br>
>> from within a unit?<br>
>><br>
> <br>
> Usually, calling daemon-reload from a unit is a sign of bad design or<br>
> misunderstanding of some tool. What exactly is the problem you are<br>
> trying to solve ?<br>
> <br>
> <br>
>> I have a "generator-like" type of unit that changes the configuration of<br>
>> other units. However, as it seems, systemd ignores such changes until I<br>
use<br>
>> daemon-reload...<br>
>><br>
> <br>
> Yes. you need an explicit daemon-reload here.<br>
> why can't it be a real generator ?<br>
<br>
AFAIK generators are quite low-level and have some restrictions. My unit is<br>
kind of high-level (e.g. it needs all filesystems mounted). Actually I started<br>
with a "normal" generator, but several restriction I can't remember right now<br>
made me change my mind to convert the generator to a "normal" (more or less)<br>
unit.<br>
<br></blockquote><div>generators are run very early during boot time so if you need external filesystems </div><div>mounted, that can indeed be a problem. </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
> <br>
> could you use systemd-run or the equivalent dbus API to do what you are<br>
> trying to do ?<br>
<br>
Good question! ;-) Browsing through the manpage I got the impression that it's<br>
systemd's version of "batch" IMHO. I'm unsure whether this has any advantage<br>
for my problem. For dbus I must admit that I have no experience of any kind<br>
with it...<br>
<br></blockquote><div></div><div>Well, it has the advantage of not needing a daemon-reload and of getting rid of the </div><div>need to create a config file altogether... you talk directly to the running instance of systemd</div><div><br></div><div>(i'm not sure what you mean by "batch" in this context. this is about creating a unit, not some</div><div>kind of shell-script-like language)</div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
Regards,<br>
Ulrich<br>
<br>
[...]<br>
<br>
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