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:
+ 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.
- http://www.pool.ntp.org/en/vendors.html
+ 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:
- 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.
+ http://www.pool.ntp.org/en/vendors.html
PAM:
The default PAM config shipped by systemd is really bare bones.