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The DNS and NTP fallback server situation is pretty similar, and downstream distros might want to change both to whatever they need, hence mention them both.
72 lines
2.8 KiB
Plaintext
72 lines
2.8 KiB
Plaintext
Porting systemd To New Distributions
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HOWTO:
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You need to make the follow changes to adapt systemd to your
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distribution:
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1) Find the right configure parameters for:
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-D rootprefix=
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-D sysvinit-path=
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-D sysvrcnd-path=
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-D rc-local=
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-D halt-local=
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-D loadkeys-path=
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-D setfont-path=
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-D tty-gid=
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-D ntp-servers=
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-D dns-servers=
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-D support-url=
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2) Try it out. Play around (as an ordinary user) with
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'/usr/lib/systemd/systemd --test --system' for a test run
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of systemd without booting. This will read the unit files and
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print the initial transaction it would execute during boot-up.
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This will also inform you about ordering loops and suchlike.
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NTP POOL:
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By default, systemd-timesyncd uses the Google Public NTP servers
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time[1-4].google.com, if no other NTP configuration is available. They
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serve time that uses a leap second smear, and can be up to .5s off from
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servers that use stepped leap seconds.
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https://developers.google.com/time/smear
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If you prefer to use leap second steps, please register your own
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vendor pool at ntp.org and make it the built-in default by
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passing --with-ntp-servers= to configure. Registering vendor
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pools is free:
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http://www.pool.ntp.org/en/vendors.html
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Use -D ntp-servers= to direct systemd-timesyncd to different fallback
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NTP servers.
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DNS SERVERS:
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By default, systemd-resolved uses the Google Public DNS servers
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8.8.8.8, 8.8.4.4, 2001:4860:4860::8888, 2001:4860:4860::8844 as
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fallback, if no other DNS configuration is available.
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Use -D dns-servers= to direct systemd-resolved to different fallback
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DNS servers.
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PAM:
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The default PAM config shipped by systemd is really bare bones.
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It does not include many modules your distro might want to enable
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to provide a more seamless experience. For example, limits set in
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/etc/security/limits.conf will not be read unless you load pam_limits.
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Make sure you add modules your distro expects from user services.
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Pass -D pamconfdir=no to meson to avoid installing this file and
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instead install your own.
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CONTRIBUTING UPSTREAM:
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We generally do no longer accept distribution-specific patches to
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systemd upstream. If you have to make changes to systemd's source code
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to make it work on your distribution, unless your code is generic
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enough to be generally useful, we are unlikely to merge it. Please
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always consider adopting the upstream defaults. If that is not
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possible, please maintain the relevant patches downstream.
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Thank you for understanding.
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