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Bug#889010: should it rather be network online target in the service file?

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Hi Christian,

On Thu, Feb 01, 2018 at 09:43:07AM +0100, Christian Ehrhardt wrote:
>Package: chrony
>Version: 3.2-2
>
>Description:
>Conversions of old $network behavior should be on online target [2].
>And I think for chrony it makes sense to start when it really is
>online to not rely too much on the hooks to set it online.

Prior to the 3.0-1 release, we used to heavily rely on the hooks as the 
time sources weren’t polled by chronyd due to the use of the “offline” 
option. This behaviour wasn’t satisfactory to me, so I decided it was 
time to change it for Debian Stretch so what's happening now is:
    
    - If the network is up:
        - chronyd starts
        - chronyc online runs, but doesn't actually do anything
        - names are resolved
        - sources are added as online
        - burst is executed

    - If the network is down:
        - chronyd starts
        - chronyc online doesn't run
        - chronyd is periodically trying, in exponentially increasing 
          interval, to resolve the pool.ntp.org name, but fails
        - network is up
        - chronyc online runs from the hooks
        - chronyd resolves the name
        - sources are added as online
        - burst is executed

Also, I think chronyd should be started quite early so the clock 
frequency offset is set from the drift file. It should also be noted 
that when used with a reference clock, chronyd does not necessarily need 
network nor DNS.

However, if starting chronyd after the network is fully up is something 
you really are looking for, I think you should start it after 
nss-lookup.target‽

>Ubuntu-Bug: 
>https://bugs.launchpad.net/ubuntu/+source/chrony/+bug/1746458
>Fix-in-Review: 
>https://git.launchpad.net/~paelzer/ubuntu/+source/chrony/commit/?id=2baea8e0bde5d6a1de60098019fb658a4a94d489
>
>[1]: https://code.launchpad.net/~paelzer/ubuntu/+source/chrony/+git/chrony/+merge/336844
>[2]: https://www.freedesktop.org/wiki/Software/systemd/NetworkTarget/
>
>-- 
>Christian Ehrhardt
>Software Engineer, Ubuntu Server
>Canonical Ltd

Cheers,
Vincent

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Bug#889010: should it rather be network online target in the service file? Christian Ehrhardt <christian.ehrhardt@canonical.com> - 2018-02-01 09:50 +0100
  Bug#889010: should it rather be network online target in the service file? Vincent Blut <vincent.debian@free.fr> - 2018-02-06 17:00 +0100
    Bug#889010: should it rather be network online target in the service file? Christian Ehrhardt <christian.ehrhardt@canonical.com> - 2018-02-08 08:20 +0100

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