Andrei Borzenkov <arvidj...@gmail.com> wrote on 03/12/2015 12:18:15 PM:
> From: Andrei Borzenkov <arvidj...@gmail.com> > To: aaron_wri...@selinc.com > Cc: systemd-devel@lists.freedesktop.org > Date: 03/12/2015 12:18 PM > Subject: Re: [systemd-devel] minimal required units > > В Thu, 12 Mar 2015 11:09:57 -0700 > aaron_wri...@selinc.com пишет: > > > > > I feel like there needs to be a list of required units to get base > > functionality out of systemd. So that embedded guys like me can build up a > > system from scratch, instead of starting from full blown desktop support > > and guessing at what can be taken out. > > > > sysinit.target is supposed to get you minimal working system (more or > less what you got with single user in the past). It could be considered > as starting point. Most embedded systems I have seen were running > something very close to single user anyway. > Right now, I'm starting with the basic.target. Gets me a few more features than sysinit.target, such as timers, which I feel I can use in my product to replace cron. > > My question is mainly about whether the list of actual required units is > > known, or if it is something that requires investigation (digging through > > a bunch of code). > > > > Did you see bootup(7)? Yes, I've read that a few times, and I love the diagram. It seems to suggest to me that I can use basic.target as a good synchronization point, and then add my units after that, which makes sense to me. If I include at least all of the units leading up to basic.target, would that cover the units required by systemd? Though, that would include lots of things I don't need, such as cryptsetup.target, swap.target, mqueue, configfs, debugfs, etc. I'm concerned because I left out local-fs.target to begin with, as I don't need systemd to mount anything, but that seemed to cause systemd to unmount everything other than / and the kernel file systems. So I got bit by there not being any documentation that says, "local-fs.target is Required". Unless, I'm missing something. PS - Thanks for pointing me at information. I'm still getting up to speed on systemd.
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