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You certainly can only use systemd's pid1 together with ntpd (systemd only does SNTP, not full-blown NTP) and no caching resolver.

In fact it's the default in most Linux distributions. The only mandatory pieces if you use systemd as pid1 are udevd and journald.

Misinformation like this is exactly why Brendan said you should ask an actual user of systemd.



I actually like systemd as an init system, and use it that way on all my current machines. (I'm a fan of journald so far too.)

However, the mere fact that (s)NTP and DNS are re-implemented in the same codebase is still unsettling to me.

Nor is it misinformation to mention their existence, or the bugs/limitations caused by the duplication of effort.

http://people.canonical.com/~ubuntu-security/cve/2017/CVE-20...

https://github.com/coreos/bugs/issues/391

(Looks like the sNTP client hasn't caused security flaws, though. I was wrong there.)


They are independent, you can use one without the other. They are just residing in the same repository and build system.


At least Ubuntu ships with both resolved and timesyncd enabled by default.




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