[Bug 1616196] Re: unable to stop avahi-daemon (dbus always restarts it)

[Trent Lloyd]

The d-bus activation thing is a quirk of systemd, it actually tells you
when you run stop.  You need to use disable (as well as stop) to both
stop it and prevent re-activation.

root at ubuntu:~# systemctl stop avahi-daemon
Warning: Stopping avahi-daemon.service, but it can still be activated by:
  avahi-daemon.socket

You're right about the ifupdown script, though.


The good news on the one hand is that upstream hopefully soon nss-mdns will be improved to no longer need this trick.

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Title:
  unable to stop avahi-daemon (dbus always restarts it)

Status in avahi package in Ubuntu:
  New

Bug description:
  When avahi-daemon is stopped, dbus always revives it.

  Steps to reproduce:

  1. sudo systemctl stop avahi-daemon.socket
  2. sudo systemctl stop avahi-daemon.service
  3. ps aux| grep avahi # should return nothing

  Currently, dbus revives it right away as shown in syslog:

  Aug 23 15:17:22 simon-vm avahi-daemon[4036]: Got SIGTERM, quitting.
  Aug 23 15:17:22 simon-vm avahi-daemon[4036]: Leaving mDNS multicast group on interface ens3.IPv6 with address 2001:470:b1c3:7946::a4.
  Aug 23 15:17:22 simon-vm avahi-daemon[4036]: Leaving mDNS multicast group on interface ens3.IPv4 with address 172.24.26.52.
  Aug 23 15:17:22 simon-vm avahi-daemon[4036]: avahi-daemon 0.6.32-rc exiting.
  Aug 23 15:17:22 simon-vm dbus[1647]: [system] Activating via systemd: service name='org.freedesktop.Avahi' unit='dbus-org.freedesktop.Avahi.service'
  Aug 23 15:17:22 simon-vm systemd[1]: Stopping Avahi mDNS/DNS-SD Stack...
  Aug 23 15:17:22 simon-vm systemd[1]: Stopped Avahi mDNS/DNS-SD Stack.
  Aug 23 15:17:22 simon-vm systemd[1]: Listening on Avahi mDNS/DNS-SD Stack Activation Socket.
  Aug 23 15:17:22 simon-vm systemd[1]: Starting Avahi mDNS/DNS-SD Stack...

  
  This automatic revival defeats the purpose of the up script [*] to deactivate avahi when .local is a regular DNS zone (not mDNS). This also goes against the principle of least surprise.

  *: /etc/network/if-{down,up}.d/avahi-daemon

  Additional information:

  # lsb_release -rd
  Description:	Ubuntu 16.04.1 LTS
  Release:	16.04

  # apt-cache policy avahi-daemon dbus systemd
  avahi-daemon:
    Installed: 0.6.32~rc+dfsg-1ubuntu2
    Candidate: 0.6.32~rc+dfsg-1ubuntu2
    Version table:
   *** 0.6.32~rc+dfsg-1ubuntu2 500
          500 http://ca.archive.ubuntu.com/ubuntu xenial/main amd64 Packages
          100 /var/lib/dpkg/status
  dbus:
    Installed: 1.10.6-1ubuntu3
    Candidate: 1.10.6-1ubuntu3
    Version table:
   *** 1.10.6-1ubuntu3 500
          500 http://ca.archive.ubuntu.com/ubuntu xenial/main amd64 Packages
          100 /var/lib/dpkg/status
  systemd:
    Installed: 229-4ubuntu7
    Candidate: 229-4ubuntu7
    Version table:
   *** 229-4ubuntu7 500
          500 http://ca.archive.ubuntu.com/ubuntu xenial-updates/main amd64 Packages
          100 /var/lib/dpkg/status
       229-4ubuntu4 500
          500 http://ca.archive.ubuntu.com/ubuntu xenial/main amd64 Packages

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: avahi-daemon 0.6.32~rc+dfsg-1ubuntu2 [modified: usr/lib/avahi/avahi-daemon-check-dns.sh]
  ProcVersionSignature: Ubuntu 4.4.0-36.55-generic 4.4.16
  Uname: Linux 4.4.0-36-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.1
  Architecture: amd64
  Date: Tue Aug 23 15:09:40 2016
  InstallationDate: Installed on 2016-08-22 (0 days ago)
  InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Beta amd64 (20160819)
  ProcEnviron:
   LANGUAGE=en_CA:en
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_CA.UTF-8
   SHELL=/bin/bash
  SourcePackage: avahi
  UpgradeStatus: No upgrade log present (probably fresh install)

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