Public bug reported:
To reproduce, mask resolved:
sudo systemctl mask systemd-resolved.service
...then disable network-manager for ifupdown interfaces:
$cat /etc/NetworkManager/NetworkManager.conf
[main]
plugins=ifupdown,keyfile
dns=default
rc-manager=resolvconf
[ifupdown]
managed=false
[device]
wifi.scan-rand-mac-address=no
...and reboot.
You'll note that resolvconf integration with dhclient is now broken.
Interfaces listed in /etc/network/interfaces or
/etc/network/interfaces.d/* will not provide DNS configuration in
/etc/resolv.conf and /run/resolvconf/interfaces/.
This is because /etc/dhcp/dhclient-enter-hooks.d/resolvconf defines
"make_resolv_conf()" as a valid function for the BOUND case, but
/etc/dhcp/dhclient-enter-hooks.d/resolved undefines it (who's nasty now,
eh?) even though resolved is masked.
The file existence check in the beginning of /etc/dhcp/dhclient-enter-
hooks.d/resolved should be more thorough, i.e. it should ensure that
resolved is enabled, rather than simply look for the existence of
/lib/systemd/systemd-resolved. This works for me:
-if [ -x /lib/systemd/systemd-resolved ] ; then
+if [ -x /lib/systemd/systemd-resolved ] && systemctl -q is-enabled
systemd-resolved ; then
Arguably, /etc/dhcp/dhclient-enter-hooks.d/resolvconf should implement a
similar check, looking for /run/resolvconf/enable-updates as a condition
for meddling with DNS settings. If desired, I'll file a separate bug for
that package.
** Affects: resolvconf (Ubuntu)
Importance: Undecided
Status: New
** Affects: systemd (Ubuntu)
Importance: Undecided
Status: New
** Also affects: resolvconf (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1745463
Title:
Disabling systemd-resolved breaks dhclient resolvconf integration
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