[systemd-devel] Requires and After

[Tomasz Torcz]

On Tue, Jan 01, 2019 at 08:20:19PM +0100, Olaf van der Spek wrote:
> On Tue, Jan 1, 2019 at 8:17 PM Ian Pilcher <arequipeno at gmail.com> wrote:
> >
> > On 1/1/19 5:44 AM, Jérémy Rosen wrote:
> > > The short answer is that Requires without after makes little sense,
> > > since you can't reliably know if your dependency is here without it
> > > (if it fails at startup, you might or might not be started, depending
> > > on the startup order systemd chooses)
> >
> > There are cases where it makes sense.  For example, most OpenStack
> > services require both a message bus and a database, but they are smart
> > enough to wait and re-attempt their connections if either of those
> > services isn't immediately available.
> 
> What's the benefit of not having After= for those services?

  I guess they can start and do their initialization in parallel with
the service they require.

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