> Do you have any idea for the described behavior with nginx then

I looked in hirsute, so not sure if things are different upstream, but
in that release the named.service is:

[Service]
EnvironmentFile=-/etc/default/named
ExecStart=/usr/sbin/named -f $OPTIONS
ExecReload=/usr/sbin/rndc reload
ExecStop=/usr/sbin/rndc stop
Restart=on-failure


since this defines an ExecStart= but doesn't set the Type=, this service 
defaults to a 'simple' type service, which means systemd considers it 'started' 
essentially immediately (specifically, as soon as systemd forks a thread to run 
the ExecStart=). So anything that is set to After=named.service (or, set that 
way indirectly, e.g. with After=nss-lookup.target) will be started when the 
process running the named binary has been started, not when named actually is 
"up and running".

The named.service should be adjusted to be a different Type=, probably
'forking' though it would depend on the exact behavior of when named
actually forks when the -f param isn't used. Essentially, the
named.service file should be configured to not be 'running' until named
is actually 'running'. See 'man systemd.service' for details on the the
Type= options.

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https://bugs.launchpad.net/bugs/1899902

Title:
  systemd unit service file does not wait for bind9 to be ready

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