Public bug reported:
I set up Avahi on two 16.04 systems, but was unable to resolve between
them via ping; note, however, that avahi-resolve worked fine:
root@clients-1:~# avahi-resolve -n -4 kentest.local
kentest.local 192.168.243.16 # This is a good thing
These, not so much good:
root@clients-1:~# ping kentest.local
ping: unknown host kentest.local
My nsswitch.conf file was thus:
hosts: files mdns4_minimal [NOTFOUND=return] dns
I did a strace on the ping, and saw this:
sun_path="/var/run/avahi-daemon/socket"}, 110) = -1 EACCES (Permission denied)
The socket's permissions were fine, so I looked at the directory the socket was
in and saw:
root@clients-1:~# ls -ald /var/run/avahi-daemon/
drwx------ 2 avahi avahi 80 Mar 27 05:35 /var/run/avahi-daemon/
It seemed to me this should have been okay -- I mean, I was trying the
ping as root, and presumably user avahi would be servicing the request
if it wasn't user root. But "Permission denied" is "permission denied,"
so I changed directory permissions and tried again:
root@clients-1:~# chmod 777 /var/run/avahi-daemon/
root@clients-1:~# ping kentest.local
PING kentest.local (192.168.243.16) 56(84) bytes of data.
64 bytes from 192.168.243.16: icmp_seq=1 ttl=64 time=1.31 ms
64 bytes from 192.168.243.16: icmp_seq=2 ttl=64 time=0.742 ms
ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: avahi-daemon 0.6.32~rc+dfsg-1ubuntu2
ProcVersionSignature: Ubuntu 4.4.0-66.87-generic 4.4.44
Uname: Linux 4.4.0-66-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.5
Architecture: amd64
Date: Mon Mar 27 14:55:01 2017
Ec2AMI: ami-00000004
Ec2AMIManifest: FIXME
Ec2AvailabilityZone: nova
Ec2InstanceType: GB.small
Ec2Kernel: unavailable
Ec2Ramdisk: unavailable
ProcEnviron:
TERM=xterm
SHELL=/bin/bash
PATH=(custom, no user)
LANG=en_US.UTF-8
XDG_RUNTIME_DIR=<set>
SourcePackage: avahi
UpgradeStatus: No upgrade log present (probably fresh install)
** Affects: avahi (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug ec2-images xenial
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https://bugs.launchpad.net/bugs/1676476
Title:
Unable to do nsswitch resolution on Avahi due to permissions issue
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