----- Mail original ----- > De: "Gordon Messmer" <gordon.mess...@gmail.com> > À: "centos" <centos@centos.org> > Envoyé: Jeudi 24 Décembre 2015 07:25:00 > Objet: Re: [CentOS] Network services start before network is up since > migrating to 7.2
> On 12/23/2015 08:38 AM, Sylvain CANOINE wrote: >> Then I'm wondering : >> 2/ why "After=foo" does not imply "Requires=foo" for systemd 219, while it >> appeared to be in systemd 208. Either it's a regression, or the behaviour of >> 208, although logical, is buggy. > > I'm not entirely certain, but "After=" is independent of "Requires=", as > documented on an up-to-date install of CentOS 7. http://www.freedesktop.org/wiki/Software/systemd/NetworkTarget/ says : "Services using the network should hence simply place an After=network.target dependency in their unit files, and avoid any Wants=network.target or even Requires=network.target." But all the other related explanations I found on the web either says nothing about the relationship between "After=" and "Requires="/"Wants=", or confirms there's not. For example in http://www.freedesktop.org/software/systemd/man/systemd.unit.html : "Note that this setting (NDR : "After=" or "Before=") is independent of and orthogonal to the requirement dependencies as configured by Requires=." I didn't found the related CentOS documentation, but I suppose it's correct. I suppose it mentions NetworkManger, anyway. <digression>I'm able to understand systemd isn't designed to make the relationship between "After=" and "Requires="... But why designing it like that ? Giving the ability to start a service before or after a disabled other is a nonsense.</digression> But all of that don't give any clue concerning the different behaviour of the two quoted versions of systemd. I think an additional "Requires=network.target" parameter in the network-online.target unit by default, or at least a note to the users, would be appreciated. Sylvain. Pensez ENVIRONNEMENT : n'imprimer que si ncessaire _______________________________________________ CentOS mailing list CentOS@centos.org https://lists.centos.org/mailman/listinfo/centos
