Re: ssh impacted by systemd.resolved

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On Wed, 2022-04-27 at 08:05 -0400, Sam Varshavchik wrote:
> The only reason systemd-resolved exists is because glibc caches  
> /etc/resolv.conf when a process performs its first DNS lookup. Having
> the means to have an existing process become aware that its been
> changed, and it should reread it, will completely eliminate the
> reason for systemd-resolved's existence. That, I think, is the right
> solution, and it was always the right solution.

I remember that kind of thing when I first started using Linux in the
early 2000s:  It seemed to presume that all networks were a permanent
thing.  If a network went up and down again, be that ethernet or your
dial-up internet, you had to manually restart NTP, and one or two other
daemons.

Things that rely on network (time servers, mail servers, etc),
shouldn't just silently die and stay dead when a network changed.  They
should be able to notice a network status change and act accordingly.
It's no good for a daemon to examine the network when it first starts
up, and then never check again.

And the converse isn't true.  The network shouldn't be poking
everything that might need to know about it.  You'd be forever building
an increasing number of wake-up routines.

I don't know about the things that used to concern me, back then, I
haven't checked lately.  But we still have applications that are
ignorant of network changes, like Firefox.  If you try to load a site
and networking fails it, that's it (whether your ISP connection was
temporarily down, or a webserver on your LAN changed IPs).  It's a case
of manual jiggery pokery by you to get it have another go at it after
it's cached a wrong or null DNS answer.
 
-- 
 
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Linux 5.11.22-100.fc32.x86_64 #1 SMP Wed May 19 18:58:25 UTC 2021 x86_64
 
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