[Bug 1797602] [NEW] systemd incompatible with openresolv and dnsmasq

[Bob Vincent]

Public bug reported:

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.

lsb_release -rd output:

Description:    Ubuntu 18.04.1 LTS
Release:        18.04

** Affects: systemd (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1797602

Title:
  systemd incompatible with openresolv and dnsmasq

Status in systemd package in Ubuntu:
  New

Bug description:
  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.

  lsb_release -rd output:

  Description:    Ubuntu 18.04.1 LTS
  Release:        18.04

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