[libvirt] [PATCH 1/2] v3: put dnsmasq parameters into a file instead of the command line

[Gene Czarcinski]

On 10/23/2012 04:10 PM, Laine Stump wrote:
>> >Can you provide a bit more info as to what you would like to change
>> >without restarting dnsmasq.
> Right now, the ranges of IP addresses, the IP addresses to listen on,
> the domain. There may be other things in the future as
> virNetworkUpdate() gets fleshed out.
http://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2012q4/006440.html
> The most difficult problem is that dnsmasq throws away root 
> permissions after start-up, so re-reading the configuration is 
> impossible if acting on the new configuration involves anything that 
> needs root (for instance, binding sockets to ports <1024 or opening 
> the lease file.)
>
> The philosophy is that things that would be really useful to change, 
> without restarting dnsmasq, and certainly don't need root, are re-read 
> on SIGHUP. That's dhcp-host information and dhcp-option information in 
> special configuration files, /etc/hosts and /etc/ethers, and possibly 
> /etc/resolv.conf, if it's not being polled anyway.
>
> For anything else, restarting dnsmasq is a pain-free operation anyway: 
> there's very little state and nothing important is lost over a reboot. 

Gene