<tt>Andrei Borzenkov <arvidjaar@gmail.com> wrote on 03/11/2015 08:47:43 PM: > From: Andrei Borzenkov <arvidjaar@gmail.com></tt> <tt>> To: Aaron_Wright@selinc.com</tt> <tt>> Cc: systemd-devel@lists.freedesktop.org</tt> <tt>> Date: 03/11/2015 08:47 PM</tt> <tt>> Subject: Re: [systemd-devel] minimal required units</tt> <tt>> > В Wed, 11 Mar 2015 12:02:29 -0700 > Aaron_Wright@selinc.com пишет: > > > I'm trying to make an embedded device, and I would like to start with the > > minimal setup as possible. Are there some units that are required by > > systemd? > > I ask because systemd is complaining about a missing rescue.target unit, > > When does it do it?</tt> <tt>It was doing this because my default unit was not set correctly. But that isn't really the question. The question is, what units are required by systemd? How can I figure that out? It seems like rescue.target, local-fs.target, and local-fs-pre.target are required, but I've only discovered that after trial and error. I know the systemd.special man page lists a ton of special units, but it seems that not all of them are required. Right? Well, which ones are? I feel like I need to look through the code to see when a hardcoded unit is referenced, like rescue.target was, that I don't know about.</tt> <tt>My device doesn't have many of the same requirements of a full desktop or server Linux, so I'm trying to strip out things from systemd, unit wise, that I don't want or need. I've customized sysinit.target and basic.target to just reference the units I want. And that seems to be going smooth, but it appears there are other units, that I didn't know about that are required, but that aren't documented as such (that I could find). This scares me a bit.</tt> <tt> > > > but I don't list rescue.target as a dependency of any other unit. > > However, grep tells me that /usr/lib/systemd/systemd contains the > > "rescue.target" string, which worries me. Is there a list of all the units > > that are required, even though no other unit lists them? </tt>