[Dnsmasq-discuss] dnsmasq won't quit if listening on 'empty' bridge?

[Simon Kelley]

Paul Chambers wrote:
> As part of a nightly script on my linux server, dnsmasq is restarted (to 
> pick up updates to a block list). However, for the last few days, it's 
> failed to restart.
> 
> The observed behavior is that the (newly rotated) log is empty, the last 
> line of the old log reports being terminated by sigterm, and netstat 
> reports that dnsmasq is still listening to TCP/UDP port 53 on 
> 192.168.122.1:53, and UDP 53 on 0.0.0.0. It is no longer listening to 
> the other interfaces on that machine (several real + alias interfaces). 
> I have bind-interfaces and except-interface=br0 in the config file.
> 
> 192.168.122.1 is bound to virbr0 (not br0), which is a bridge created 
> when I recently installed kvm (kernel virtual machine). I have not added 
> any 'real' interfaces to this bridge yet.
> 
> The strangest part is that I can't recreate this by typing the same 
> command into the shell as is used by the script (service dnsmasq 
> restart). Nor by running the script itself manually. It only happens 
> when cron runs the script.
> 
> I'm running dnsmasq 2.46 on Fedora 10 (2.6.27.19-170.2.35.fc10.i686.PAE)
> 
> Any ideas?

Are you using libvirt? The latest incarnations of libvirt use a 
"private" instance of dnsmasq to provide DNS and boot services it the 
virtual machines. Maybe that's what you are seeing?

Simon.