Ralf Mardorf writes:
> On Thu, 2014-02-13 at 09:12 +0100, Gian Uberto Lauri wrote:
[... omissis ...]
> > Do I find a clear, reliable set of instructions to achieve this goal?
[... omissis ...]
> "Handling dependencies
> With systemd, dependencies can be resolved by designing the unit files
> correctly. The most typical case is that the unit A requires the unit B
> to be running before A is started. In that case add Requires=B and
> After=B to the [Unit] section of A. If the dependency is optional, add
> Wants=B and After=B instead. Note that Wants= and Requires= do not imply
> After=, meaning that if After= is not specified, the two units will be
> started in parallel.
> Dependencies are typically placed on services and not on targets. For
> example, network.target is pulled in by whatever service configures your
> network interfaces, therefore ordering your custom unit after it is
> sufficient since network.target is started anyway." -
Thanks.
Not the clearest documentation possible, humans are ill suited for
forward references (that nevertheless require a second pass on the
source). And still several concepts are still in the wiki-page
author's brain.
Another question. Systemd will continue to let me use the systemv
scripts?
Systemd is a complex system meant to handle with system whose
configuration varies a lot (exp. hardware configuration).
Therefore, it is a good tool for users that are happy with what comes
out of the box -like DHCP is a good idea for an user that just wants a
TCP/IP configuration and would not care less of the assigned IP
address-
Please correct me, but I think it could let me start mount a certain
file system if and only if there is a certain device on the USB bus,
and that could maybe with less than 90 lines (the len of the script I
use, most of them handle the possible anomalies).
But it seems that reaches this goal at the cost of increasing the
complexity.
I still think that systemd could not be the right choices where - for
example - hardware re-configuration will never happen while the
increased complexity turns out to be a burden greater than any benefit
received. "Falling back" to a System V emulation could give an escape
from that complexity.
Or else, leave the user choose what to use.
--
ing. Gian Uberto Lauri
Solution Developer Senior
Direzione Ricerca e Innovazione
gianuberto.la...@eng.it
Sun Java Certified Programmer
Engineering Ingegneria Informatica spa
Corso Stati Uniti 23/C, 35127 Padova (PD)
Tel. +39-049.8283.517 | main(){printf(&unix["\021%six\012\0"],
Fax +39-049.8283.569 | (unix)["have"]+"fun"-0x60);}
http://www.eng.it | David Korn, AT&T Bell Labs
| ioccc best One Liner, 1987
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