On my Ubuntu 14.04 VPS, dnsmasq keeps changing my nameservers under /run/resolv.conf when it renews leases every few hours. I had installed dnsmasq as part of my OpenVPN setup following a Linode doc.

I now regularly check and force Google DNS into the /etc/dnsmasq.conf, /run/dnsmasq, /run/resolvconf/, /run/resolvconf/interface/, /etc/resolvconf/resolv.conf.d/, /var/lib/dhcp/ files, etc. Note that
/etc/resolv.conf -> ../run/resolvconf/resolv.conf.

I have checked a lot of posting that claim to control this, but inevitably there are more recent postings debunking those claims.

dnsmasq keeps changing my Google DNS to the Linode nameservers?

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Please have a look at the cronjobs, maybe there is some cron set to revert them back to old nameservers

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Hi. Yes, that was looked at early after I saw this happening. I see nothing under /var/spool/cron/crontabs/root that would do this. I see no other crontab files under /var/spool/cron/ .

I also tried:
:/etc# grep -i dns cron*
:/etc# grep -i dns cron*/*
:/etc# grep -i dns cron*/*/*
but nothing came up.

Thanks.

Lester

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http://www.ingber.com

Take a look in the /etc/cron.* directories?

Alternatively, manually define nameservers in /etc/network/interfaces, 'auto eth0; iface eth0 inet dynamic' add 'dns-nameservers 8.8.8.8, 8.8.4.4'.

(Alternatively, remove the symlink /etc/resolv.conf, and make a new file)

Hi. yes, I believe I did that (just checked again).

I just now made a couple of changes:
/etc/dnsmasq.conf (set no-poll)
/etc/default/dnsmasq (set IGNORE_RESOLVCONF=yes and ENABLED=0)

I don't think changing the symlink will help as OpenVPN looks at /run/dnsmasq/resolv.conf , even if /run/resolvconf/resolv.conf is set as I wish.

I'm trying to do gradual minimal changes to not break OpenVPN.

I'll check /var/log/syslog again tomorrow.

Thanks.

Lester

_________________
http://www.ingber.com

My latest changes seems to have solved the specific problem. Now I have to see if this wrecked anything else.

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http://www.ingber.com

Nope. I still am getting many lines in /var/log/apache2/other_vhosts_access.log like:
::1 - - [23/Jun/2015:18:42:53 -0700] "OPTIONS * HTTP/1.0" 403 0 "-" "Apache/2.4.7 (Ubuntu) OpenSSL/1.0.1f (internal dummy connection)"

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http://www.ingber.com

The 403 errors seem to have been due to
<IfModule mod_cloudflare.c>
...
</IfModule>
coming after
</VirtualHost>
in my ssl.conf file. Once this was fixed, I do not have the 403 problems.

The dnsmasq behavior has not been fixed. I have to poll several files regularly to "correct" my nameservers.

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