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Merge pull request #554 from poettering/ntp-pool

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build-sys: warn if people don't change the default NTP servers when b…
This commit is contained in:
Tom Gundersen 2015-07-12 11:43:51 +02:00
commit fdbbf0eeda
3 changed files with 26 additions and 1 deletions
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19
DISTRO_PORTING
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@ -14,6 +14,7 @@ HOWTO:
--with-kbd-loadkeys= --with-kbd-loadkeys=
--with-kbd-setfont= --with-kbd-setfont=
--with-tty-gid= --with-tty-gid=
--with-ntp-servers=
2) Try it out. Play around (as an ordinary user) with 2) Try it out. Play around (as an ordinary user) with
'/usr/lib/systemd/systemd --test --system' for a test run '/usr/lib/systemd/systemd --test --system' for a test run
@ -21,6 +22,24 @@ HOWTO:
print the initial transaction it would execute during boot-up. print the initial transaction it would execute during boot-up.
This will also inform you about ordering loops and suchlike This will also inform you about ordering loops and suchlike
NTP POOL:
By default, timesyncd uses the Google NTP servers
time[1-4].google.com. They serve time that is not standards
compliant, and can be up to .5s off. Google does not
officially support these servers for the broader
audience. Distributions and vendors really should not ship
OSes or devices with these NTP servers configured. Instead,
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
Again, if you ship your software or device with the default
NTP servers, then you will get served wrong time, and will
rely on services that might not be supported for long.
CONTRIBUTING UPSTREAM: CONTRIBUTING UPSTREAM:
We generally do no longer accept distribution-specific We generally do no longer accept distribution-specific

5
README
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@ -270,6 +270,11 @@ WARNINGS:
false positives will be triggered by code which violates false positives will be triggered by code which violates
some rules but is actually safe. some rules but is actually safe.
Currently, systemd-timesyncd defaults to use the Google NTP
servers if not specified otherwise at configure time. You
really should not ship an OS or device with this default
setting. See DISTRO_PORTING for details.
ENGINEERING AND CONSULTING SERVICES: ENGINEERING AND CONSULTING SERVICES:
ENDOCODE <https://endocode.com/> offers professional ENDOCODE <https://endocode.com/> offers professional
engineering and consulting services for systemd. Please engineering and consulting services for systemd. Please

3
configure.ac
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@ -1009,7 +1009,8 @@ AC_ARG_WITH(ntp-servers,
AS_HELP_STRING([--with-ntp-servers=NTPSERVERS], AS_HELP_STRING([--with-ntp-servers=NTPSERVERS],
[Space-separated list of default NTP servers]), [Space-separated list of default NTP servers]),
[NTP_SERVERS="$withval"], [NTP_SERVERS="$withval"],
[NTP_SERVERS="time1.google.com time2.google.com time3.google.com time4.google.com"]) [NTP_SERVERS="time1.google.com time2.google.com time3.google.com time4.google.com"
AC_MSG_WARN([*** Using Google NTP servers. Please do not ship OSes or devices with these default settings. See DISTRO_PORTING for details!])])
AC_DEFINE_UNQUOTED(NTP_SERVERS, ["$NTP_SERVERS"], [Default NTP Servers]) AC_DEFINE_UNQUOTED(NTP_SERVERS, ["$NTP_SERVERS"], [Default NTP Servers])
AC_SUBST(NTP_SERVERS) AC_SUBST(NTP_SERVERS)