[Dnsmasq-discuss] Bug in systemd/dhcp scripts that affects dnsmasq

[Bob Vincent]

I've submitted an Ubuntu bug-report here:

https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1797602

*Problem*:


   - systemd breaks resolvconf-dependent DNS

*Test case:*


   - Install dnsmasq with systemd.

*Result*:

   - The script in /etc/dhcp/dhclient-enter-hooks.d/resolvconf defines the
   make_resolv_conf() function to pass DHCP information to the
   /sbin/resolvconf program.
   - The script in /etc/dhcp/dhclient-enter-hooks.d/resolved redefines the
   make_resolv_conf() function to write DHCP information to
   /run/systemd/resolved.conf.d/isc-dhcp-v4-$interface.conf
   - As a result, resolvconf never runs, and dnsmasq never receives the
   DHCP-supplied nameservers.
   - Therefore, DNS resolution is broken.

*Expected result*:

   - DHCP-supplied nameservers should be passed to both resolvconf and to
   systemd.

*Workaround*:

   - Use the 127.0.0.53 address for the systemd resolver as the dnsmasq
   upstream server.

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