[Dnsmasq-discuss] addn-hosts marked inactive if it doesn't exist at startup

[Simon Kelley]

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On 02/02/15 03:22, Alan wrote:
> I configured dnsmasq to read an additional hosts file using:
> 
> addn-hosts=/var/run/openvpn/hosts.muvpn
> 
> This file is created and updated by openvpn when users connect and 
> disconnect via external script, I believe this is one of the
> intended use-cases of addn-hosts.
> 
> The file isn't created until someone connects for the first time. 
> The problem is that if the file doesn't exist when dnsmasq starts,
> it will not try to read it anymore even if it is created.
> 
Are you sending SIGHUP to dnsmasq to ask it to re-read the file? If
not then it won't be read again, and even if you make changes they
won't be reflected in dnsmasq's configuration.

Looking at the code, I think non-existence of the file is not a fatal
error, so the creating the file is treated in exactly the same way as
modifying it: you have to send SIGUSR1 to get the changes into dnsmasq.

> The same happens if using a directory that hasn't been created by
> the time dnsmasq started.

Again, if you send SIGHUP, it should still work.
> 
> It would be nice if this is fixed in dnsmasq instead of
> implementing a workaround.

There is a new facility in the latest dnsmasq code, to allow files to
be read incrementally as they appear or are changed, without needing
SIGHUP. It only works on Linux, and is somewhat  experimental, but
it's work a look. See --hostsdir in the git repo HEAD branch.


Cheers,

Simon.

> 
> Thanks.
> 
> _______________________________________________ Dnsmasq-discuss
> mailing list Dnsmasq-discuss at lists.thekelleys.org.uk 
> http://lists.thekelleys.org.uk/mailman/listinfo/dnsmasq-discuss
> 
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