Re: [libvirt] [PATCH] network: Add support for configuring dhcp lease time
On Wed, Sep 28, 2016 at 06:03:21PM +0200, Martin Wilck wrote:
On Wed, 2016-09-28 at 16:41 +0100, Daniel P. Berrange wrote:
> Anyone who cares about VMs having the same IP address after resuming
> from suspend *must* configure persistent DHCP mappings for their
> guests.
> Relying on automatic assignment will always fail in the end, may be
> not immediately, may be not often, but it *will* fail at some point,
> usually at the worst possible time.
I believe that setting "dhcp-authoritative" will be a major improvement
for many setups. Without it, VMs are *never* able to reacquire their
expired lease. With it, reacquiring the lease would work most of the
time (as far as I'm concerned, practically always). I reckon the
dnsmasq man page recommends it for a reason "when dnsmasq is definitely
the only DHCP server on a network".
That certainly matches our deployment model for dnsmasq, so unless
there's a obvious downside to it, it seems reasonable to add that.
Regards,
Daniel
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