[systemd-devel] systemd boot sequence doubt

[kennedy]

thanks.


when will systemd run "generators"? In the beginning of the boot ?
I can't see "sysv-generator" in /src/core/main.c 








在 2015-10-22 15:35:58，"Mantas Mikulėnas" <grawity at gmail.com> 写道：

On Thu, Oct 22, 2015 at 9:37 AM, kennedy <kennedyhan at 163.com> wrote:

what is systemd booting sequence?


how is Systemd support both sysV's runlevel script and systemd's target file at the same time?


systemd first runs its "generators", which generate .mount units from /etc/fstab (systemd-fstab-generator), .service units from /etc/rc?.d (systemd-sysv-generator), and so on.


(The auto-generated units live in /run/systemd/generator; the package-distributed ones in /usr/lib/systemd/system; the user-provided ones in /etc/systemd/system.)


systemd then starts with "default.target" (usually symlinked to multi-user.target), creates a dependency tree (based on Wants= or Requires= in the unit files, symlinks in *.wants/, or drop-ins in *.d/), and starts all units that default.target depends on:


$ systemctl list-dependencies multi-user.target
multi-user.target

 ├─apache2.service
 ├─bind9.service
 ├─binfmt-support.service
 ├─cron.service
 ├─dbus.service


See also manual pages for bootup(7), systemd.unit(5)


--

Mantas Mikulėnas <grawity at gmail.com>
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