touch-packages team mailing list archive

[Trent Lloyd <trent.lloyd@xxxxxxxxxxxxx>]

I was re-visiting this recently, I'm fairly sure we can get rid of this
requirement to stop avahi with a .local by reconfiguring nsswitch.conf
to remove the [NOTFOUND=RETURN].

Do you know where the initial discussion determining why to do this was
had?


My general understanding is that because of the [NOTFOUND=RETURN] in nsswitch.conf, if avahi is started then .local domains wont resolve as mdns returns NOTFOUND for any .local then causing the lookup to short circuit and return failed.

If we remove this flag, it should fall through to DNS and work as
expected, though possibly with an increased timeout.

Generally mDNS only has single depth hostnames that you lookup via
regular dns, e.g. host1.local -- sub.host1.local is generally not
allowed by the spec for normal hostnames.  In contrast, most .local
domains are active directory/windows or other domains where they usually
have 3 levels, e.g. host.network.local -- if the timeout is an issue we
could very likely fall through on multi label hosts if it's not in the
cache.

-- 
You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to avahi in Ubuntu.
https://bugs.launchpad.net/bugs/1441008

Title:
  under systemd avahi-daemon doesn't stay disabled when .local is
  detected

Status in avahi package in Ubuntu:
  Triaged

Bug description:
  When avahi daemon detects .local unicast domain, the daemon is
  disabled. When a user tries to resolve a domain name through nss, the
  daemon starts up.

  The root cause is most likely in systemd that starts the daemon when
  an application tries to access the socket through the systemd managed
  socket file.

  This behavior wasn't observed in 14.10 or earlier releases, thus the
  assumption towards systemd socket activation.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: avahi-daemon 0.6.31-4ubuntu4
  ProcVersionSignature: Ubuntu 3.19.0-10.10-generic 3.19.2
  Uname: Linux 3.19.0-10-generic x86_64
  NonfreeKernelModules: wl
  ApportVersion: 2.17-0ubuntu1
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Tue Apr  7 09:51:43 2015
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2013-11-16 (506 days ago)
  InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
  SourcePackage: avahi
  UpgradeStatus: Upgraded to vivid on 2015-03-18 (19 days ago)

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