On 02/01/2019 07:31, Michael Chapman wrote:
On Tue, 1 Jan 2019, Olaf van der Spek wrote:
Hi,
AFAIK socket units require a separate file, which seems more complex
then it has to be.
1. Could sockets be specified directly in the .service file?
If anything, I should think it would work the other way around: a .socket
without any activatable .service is relatively useless.
But I'm not proposing that this actually be implemented.
A socket can trigger a service with a different name using Service=
moreover a service can be triggered by multiple sockets. It's a bit
complicated to use (check Socket= in [Service]) but it can be handy
if you want your web server to be started both by 80 and 8080
2. If not, could the .service file gain a default / implicit
dependency on the .socket file?
There are a some reasons for not having a .service dependent upon its
.socket. Many services can be started directly and will work correctly
even when not passed any sockets from systemd.
3. AFAIK Install.WantedBy doesn't have a default. Could it get a proper default?
WantedBy is valid for all units, not just services and can have lots of
proper values, not just
default.target.
Lots of on demand daemons do not have a WantedBy at all. they have
Also=<a trigger unit>
That doesn't make much sense.
Take your example:
xhp.service:
[Unit]
Requires=xhp.socket
[Install]
WantedBy=default.target
xhp.socket:
[Socket]
ListenStream=/run/xhp.socket
This would start xhp.service at daemon startup (i.e. boot, for the system
daemon) whether or not the service is actually required. One of the
reasons for using socket activation is to _not_ start services when
they're not required.
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