[Bug 1631241] Re: Name resolution stops working after resume from suspend

[Michael Gratton]

On Fri, Oct 7, 2016 at 10:44 PM, Martin Pitt <martin.pitt at ubuntu.com> 
wrote:
>>  To fix the problem
> 
> Please tell us what actually *is* the problem.

My apologies, I should have said "To work around the problem" in the 
last comment.

>>  I need to manually edit /etc/resolv.conf and replace dnsmasq's
> 127.0.0.1 with resolve's 127.0.0.53
> 
> So are you trying to not use NM's dnsmasq instance because that stops
> working after suspend/resume?

It looks like it, yes. As I (obliquely) mentioned in comment 3, dnsmasq 
seems to stop responding to UDP requests on 127.0.0.1 after resume.

-- 
⊨ Michael Gratton, Percept Wrangler.
⚙ <http://mjog.vee.net/>

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https://bugs.launchpad.net/bugs/1631241

Title:
  Name resolution stops working after resume from suspend

Status in systemd package in Ubuntu:
  Incomplete

Bug description:
  After upgrading to Yakkety, when my Ubuntu GNOME laptop resumes from
  suspend DNS resolution stops working.

  After resuming, systemd-resolved is running and libnss-resolve is
  installed, but /etc/resolv.conf contains 127.0.1.1 as the the only
  name server. The dnsmasq-base package is installed since it is pulled
  in by both network-manager and lxc1, and both NM and libvirt have
  spawned instances of dnsmasq:

  >  1155 pts/2    S+     0:00 grep dnsmasq
  >  2724 ?        S      0:00 dnsmasq -u lxc-dnsmasq --strict-order --bind-interfaces --pid-file=/run/lxc/dnsmasq.pid --listen-address 10.0.3.1 --dhcp-range 10.0.3.2,10.0.3.254 --dhcp-lease-max=253 --dhcp-no-override --except-interface=lo --interface=lxcbr0 --dhcp-leasefile=/var/lib/misc/dnsmasq.lxcbr0.leases --dhcp-authoritative
  >  2992 ?        S      0:00 /usr/sbin/dnsmasq --conf-file=/var/lib/libvirt/dnsmasq/default.conf --leasefile-ro --dhcp-script=/usr/lib/libvirt/libvirt_leaseshelper
  >  2993 ?        S      0:00 /usr/sbin/dnsmasq --conf-file=/var/lib/libvirt/dnsmasq/default.conf --leasefile-ro --dhcp-script=/usr/lib/libvirt/libvirt_leaseshelper
  > 22879 ?        S      0:00 /usr/sbin/dnsmasq --no-resolv --keep-in-foreground --no-hosts --bind-interfaces --pid-file=/var/run/NetworkManager/dnsmasq.pid --listen-address=127.0.1.1 --cache-size=0 --conf-file=/dev/null --proxy-dnssec --enable-dbus=org.freedesktop.NetworkManager.dnsmasq --conf-dir=/etc/NetworkManager/dnsmasq.d

  Let me know if you need any extra info.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.10
  Package: libnss-resolve 231-9git1
  ProcVersionSignature: Ubuntu 4.8.0-17.19-generic 4.8.0-rc7
  Uname: Linux 4.8.0-17-generic x86_64
  ApportVersion: 2.20.3-0ubuntu7
  Architecture: amd64
  CurrentDesktop: GNOME
  Date: Fri Oct  7 13:52:40 2016
  InstallationDate: Installed on 2015-07-22 (443 days ago)
  InstallationMedia: Ubuntu-GNOME 15.04 "Vivid Vervet" - Release amd64 (20150422)
  SourcePackage: systemd
  UpgradeStatus: Upgraded to yakkety on 2016-10-05 (1 days ago)

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