Avahi/mdns resolution.

[Ken D'Ambrosio]

Yay, strace.  I'm guessing people don't use Avahi for service discovery 
a whole bunch these days -- at least, on Ubuntu 16.04.  (Which makes me 
wonder what people *do* use -- if anyone has a suggestion for service 
discovery on a network where *no* IPs are known in advance, I'm all 
ears.)  Anyway:
Strace output:
connect(4, {sa_family=AF_LOCAL, 
sun_path="/var/run/avahi-daemon/socket"}, 110) = -1 EACCES (Permission 
denied)

root at clients-1:~# ls -ald /var/run/avahi-daemon/
drwx------ 2 avahi avahi 80 Mar 27 05:35 /var/run/avahi-daemon/

root at clients-1:~# chmod 777 /var/run/avahi-daemon/
root at 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

Weird, I tells ya'.  *wanders off to file a bug report*

-Ken

-----------------------------------------------------------------------------

On 2017-03-27 10:17, Ken D'Ambrosio wrote:
> Hi, all.  For service discovery on a cloud subnet, I'm trying to get 
> the
> different VM's to resolve each other -- by strong preference, 
> seamlessly
> -- via Avahi.  And it works... kinda:
> 
> root at 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 at clients-1:~# ping kentest.local
> ping: unknown host kentest.local
> root at clients-1:~# host kentest.local
> Host kentest.local not found: 3(NXDOMAIN)
> 
> 
> Here's my pertinent nsswitch line:
> hosts:          files mdns4_minimal [NOTFOUND=return] dns
> 
> 
> Since the daemon is clearly replying with correct info, I assume I'm
> doing something wrong client-side (though as I've never done this
> before, I guess it could still be a server-side issue).  Any hints or
> ideas?
> 
> Thanks,
> 
> -Ken
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