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Porting systemd To New Distributions
HOWTO:
You need to make the follow changes to adapt systemd to your
distribution:
1) Find the right configure parameters for:
--with-rootprefix=
--with-sysvinit-path=
--with-sysvrcnd-path=
--with-rc-local-script-path-start=
--with-rc-local-script-path-stop=
--with-kbd-loadkeys=
--with-kbd-setfont=
--with-tty-gid=
--with-ntp-servers=
--with-support-url=
2) Try it out. Play around (as an ordinary user) with
'/usr/lib/systemd/systemd --test --system' for a test run
of systemd without booting. This will read the unit files and
print the initial transaction it would execute during boot-up.
This will also inform you about ordering loops and suchlike
NTP POOL:
By default, timesyncd uses the Google Public NTP servers
time[1-4].google.com. They serve time that uses a leap second
smear, and can be up to .5s off from servers that use stepped
leap seconds.
https://developers.google.com/time/smear
If you prefer to use leap second steps, please register your own
vendor pool at ntp.org and make it the built-in default by
passing --with-ntp-servers= to configure. Registering vendor
pools is free:
http://www.pool.ntp.org/en/vendors.html
PAM:
The default PAM config shipped by systemd is really bare bones.
It does not include many modules your distro might want to enable
to provide a more seamless experience. For example, limits set in
/etc/security/limits.conf will not be read unless you load pam_limits.
Make sure you add modules your distro expects from user services.
Pass --with-pamconfdir=no to ./configure to avoid installing this file
and instead install your own.
CONTRIBUTING UPSTREAM:
We generally do no longer accept distribution-specific
patches to systemd upstream. If you have to make changes to
systemd's source code to make it work on your distribution,
unless your code is generic enough to be generally useful, we
are unlikely to merge it. Please always consider adopting the
upstream defaults. If that is not possible, please maintain
the relevant patches downstream.
Thank you for understanding.