[Dnsmasq-discuss] Polling of hosts file
franco.broi at iongeo.com
Wed Mar 19 09:24:00 UTC 2014
I hear what you say but for me it would be very convenient, I have
several dnsmasq servers all reading the same shared hosts file.
My currently solution is to run a script from cron that detects a change
and sends HUP to dnsmasq.
You could have a few simple safeguards, like delaying the update if the
number of hosts has reduced drastically etc..
On Wed, 2014-03-19 at 09:07 +0000, Simon Kelley wrote:
> On 19/03/14 04:04, Franco Broi wrote:
> > Hi
> > Just wondering why dnsmasq doesn't poll the hosts file for changes like
> > it does for resolv.conf?
> Polling files is dangerous. You can get race conditions where the update
> time changes but the file is still in the process of being written.
> Polling resolv.conf is necessary because there are lots of things which
> just write it and expect the changes to be picked up (because that's
> what the resolver library does.) That's not true for /etc/hosts, so it's
> better to mandate the update-then-signal model.
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> Dnsmasq-discuss at lists.thekelleys.org.uk
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