Public bug reported:
Since a recent reboot (00:00 CEST on tuesday to be precise), DNS
settings from the interfaces file are no longer present in resolvconf. A
file /run/resolvconf/interface/eth0.inet exists but is empty.
This is happening on a xenial system. I have since rebooted once more,
with the same result.
These are the contents of /etc/network/interfaces:
----
iface lo inet loopback
auto eth0
iface eth0 inet static
address 192.168.200.52
netmask 255.255.255.0
gateway 192.168.200.5
dns-nameserver 192.168.200.5
dns-nameserver 8.8.8.8
# second address
iface eth0 inet static
address 192.168.200.67
netmask 255.255.255.0
----
I'm running dnsmasq as a local DNS server on this system, which expects
to get the "upstream" dns servers from resolvconf and thus can no longer
resolve external addresses.
Until this recent reboot, this configuration has worked without issue
for many months, I have the etckeeper log to prove it :-).
Here are some relevant excerpts from the logs:
----
systemd[1]: Starting Clean up any mess left by 0dns-up...
systemd[1]: Reached target Remote File Systems.
systemd[1]: Started Clean up any mess left by 0dns-up.
systemd[1]: Starting Nameserver information manager...
systemd[1]: Started Nameserver information manager.
systemd[1]: Reached target Sockets.
systemd[1]: Reached target Basic System.
systemd[1]: Starting dnsmasq - A lightweight DHCP and caching DNS server...
systemd[1]: Starting Restore /etc/resolv.conf if the system crashed before the
ppp link was shut down...
systemd[1]: Starting Raise network interfaces...
systemd[1]: Started ifup for eth0.
systemd[1]: Started Restore /etc/resolv.conf if the system crashed before the
ppp link was shut down.
ifup[624]: /sbin/ifup: waiting for lock on /run/network/ifstate.eth0
systemd[1]: Started Raise network interfaces.
systemd[1]: Reached target Network.
dnsmasq[583]: dnsmasq: syntax check OK.
systemd[1]: Reached target Network is Online.
ntpdate[840]: name server cannot be used: Temporary failure in name resolution
(-3)
dnsmasq[975]: started, version 2.75 cachesize 150
dnsmasq[975]: compile time options: IPv6 GNU-getopt DBus i18n IDN DHCP DHCPv6
no-Lua TFTP conntrack ipset auth DNSSEC loop-detect inotify
dnsmasq[975]: DNS service limited to local subnets
dnsmasq-dhcp[975]: DHCP, IP range 192.168.200.100 -- 192.168.200.200, lease
time 1h
dnsmasq[975]: using local addresses only for domain myname.local
dnsmasq[975]: no servers found in /var/run/dnsmasq/resolv.conf, will retry
dnsmasq[975]: read /etc/hosts - 14 addresses
ntpd[1060]: error resolving pool 0.ubuntu.pool.ntp.org: Temporary failure in
name resolution (-3)
systemd[1]: Started dnsmasq - A lightweight DHCP and caching DNS server.
systemd[1]: Reached target Host and Network Name Lookups.
ntpd[1060]: error resolving pool 1.ubuntu.pool.ntp.org: Temporary failure in
name resolution (-3)
----
** Affects: resolvconf (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1830945
Title:
DNS settings from interfaces file are ignored
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