[systemd-devel] minimal required units

Peter Sztan sztanpet at gmail.com
Thu Mar 12 09:33:38 PDT 2015

Sorry for the noise, I have now read that you have already seen it.

On Thu, Mar 12, 2015 at 5:32 PM, Peter Sztan <sztanpet at gmail.com> wrote:
> man 7 systemd.special
> On Thu, Mar 12, 2015 at 4:41 PM,  <Aaron_Wright at selinc.com> wrote:
>> Andrei Borzenkov <arvidjaar at gmail.com> wrote on 03/11/2015 08:47:43 PM:
>>> From: Andrei Borzenkov <arvidjaar at gmail.com>
>>> To: Aaron_Wright at selinc.com
>>> Cc: systemd-devel at lists.freedesktop.org
>>> Date: 03/11/2015 08:47 PM
>>> Subject: Re: [systemd-devel] minimal required units
>>> В Wed, 11 Mar 2015 12:02:29 -0700
>>> Aaron_Wright at 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?
>> 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.
>> 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.
>>> > 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?
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