Gracefully stopping varnish

[Hugues Alary]

Hi there,

I've been looking around and I can't find a documented way of gracefully
shutting down varnishd, and by gracefully I mean tell varnish "stop
accepting connections, but finish what you were doing, then shutdown".

I did find something in the "first varnish design notes" (
https://varnish-cache.org/docs/5.1/phk/firstdesign.html) which seemed to
indicate that sending SIGKILL/SIGTERM would mean "suspend/stop" but KILL
doesn't seem to work, and TERM, well... terminates but not gracefully.

I also tried using "varnishadm stop", which also doesn't gracefully stops
connection.

Is there anyway to achieve this?

Thanks!
-Hugues
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