[Dnsmasq-discuss] Multiple resolv.conf files ...
simon at thekelleys.org.uk
Wed Oct 14 12:03:28 BST 2009
Clinton Lee Taylor wrote:
> Greetings ...
>>> Been looking into creating a Linux Router that can be used for
>>> internet connection fall over, when the primary internet connection
>>> fails, I would like to have the router switch to the backup. I know
>>> that DnsMasq can't really help with this, but, I'm looking at making a
>>> second connection, using 3G ...
>>> So, my problem is that without making very complicated scripts, could
>>> we not make DnsMasq be able to read multiple resolv.conf type files
>> Simon already has this covered, read your man page, which says
>> "Dnsmasq can be told to poll more than one resolv.conf file".
> Arh, yes ... I did see this and hoped that it would work similar to
> other multiple options ...
> Went through that, but I did not get it to work as I had hoped ...
>> You'll solve your problem a lot faster than waiting for an answer from the list.
> Mmm, right and wrong ... If you read the little bit before, I was
> hoping that I could read multiple resolv.conf type files, but testing
> showed something that did not seem to be working as I had expected ...
> Was hoping that either what I was epxecting, could be helped or maybe
> another insight into another way to do a similar thing ...
>>> The reason I would like this, is that each internet facing interface,
>>> using something like DHCP, would have their own DNS server list that I
>>> could get DnsMasq to read/use, so that DNS queries would be sent down
>>> each active internet interface ...
> I added to my dnsmasq.conf file two lines as follows ...
> But when I restart dnsmasq, it only list the last resolv.conf file
> and the dns server there in ... Do I need to use the -r option from
> the command line ( init script ) or can this option be used in the
> dnsmasq.conf file?
> Oct 14 12:49:30 hermes dnsmasq: exiting on receipt of SIGTERM
> Oct 14 12:49:30 hermes dnsmasq: started, version 2.45 cachesize 150
> Oct 14 12:49:30 hermes dnsmasq: compile time options: IPv6
> GNU-getopt no-ISC-leasefile no-DBus no-I18N TFTP
> Oct 14 12:49:30 hermes dnsmasq: DHCP, IP range 192.168.1.65 --
> 192.168.1.115, lease time 4h
> Oct 14 12:49:30 hermes dnsmasq: reading /etc/resolv.conf.dnsmasq-3g
> Oct 14 12:49:30 hermes dnsmasq: using nameserver 22.214.171.124#53
> Oct 14 12:49:30 hermes dnsmasq: read /etc/hosts - 8 addresses
Dnsmasq checks the modification times of both (all) the files, and uses
the one that was changed last. Try this:
You should see dnsmasq read the eth0 file and start to use the
nameservers in there.
You need to ensure that the relevant resolv.conf file is updated when a
network link goes live and all should be well.
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