Miroslav Lichvar b8b751a932 socket: enable port sharing on Linux ...

On Linux, enable the SO_REUSEPORT option on sockets bound to a port in
order to support load balancing with multiple chronyd instances
(configured to not adjust the system clock).

The IP_FREEBIND option already allowed different instances to bind to
the same address and port, but only one was actually receiving packets.

As the instances don't share their state, sharing the NTP port doesn't
work well with the interleaved mode, symmetric mode, and rate limiting.

Sharing the NTS-KE port will not work until the server keys can be
derived from a shared key.

2020-03-24 16:29:33 +01:00

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