DNS lost after reboot about webmin

[stoufa06]

@webmin, @jcameron , @swelljoe, @gandyman
Someone has fix this before?

[jcameron]

This has been fixed for several versions now.

[stoufa06]

i have download the last version from github and i have diff net module with my current webmin installation but i have not find big difference between.
Can you tell me where is the fix because we are running custom version of webmin and i can not update from webmin.
Thanks

[jcameron]

The fix is in the file net/linux-lib.pl . The commit 3695f7e implements most of it, but there have been other bugfixes since then.

[stoufa06]

Thank you for your response, i was searching in bad place. I am running centos 6.2
This is not webmin bug but it should detect that, also there might be an option to edit interface for PEERDNS.
the problem was from PEERDNS=yes in /etc/sysconfig/network-scripts/ifcfg-eth0
http://www.centos.org/docs/5/html/Deployment_Guide-en-US/s1-dhcp-configuring-client.html

[jcameron]

Unfortunately Webmin doesn't yet support setting PEERDNS in ifcfg-ethN files.

[philmck]

Still failing sometimes for me with Ubuntu 14.04.3 and Webmin 1.782. There must be another cause. I've checked that it's not caused by the hypervisor (KVM).

[jcameron]

philmck - check if your network interface is configured using DHCP. That can cause the DNS settings to be overridden.

[philmck]

It's not using DHCP (at least, not according to webmin and my understanding of network/interfaces)

[jcameron]

Is Webmin updating the PEERDNS or DNS lines in /etc/sysconfig/network-scripts/ifcfg-eth0 ? That should be fixed in the latest release, but only if you changed the DNS servers after upgrading.

[philmck]

That's a RedHat path and I'm on Ubuntu so no. But it is updating in dns-nameservers under eth0 in /etc/network/interfaces. I did notice though that IPv6 DNS settings are in the inet section rather than the inet6 section, which seems wrong.

The "post-up iptables-restore < /etc/iptables.up.rules" line is NOT being updated by webmin now but it's recognised if I put it in manually.

[jcameron]

It looks like you have a different problem to the original poster then. Is your issue that /etc/resolv.conf is being over-written with the wrong nameservers on reboot?

[iliajie]

Cockpit rewrites net-config files and probably resolve.conf as well. Do you use Cockpit?

[philmck]

My problem is DNS settings being lost on reboot, I'm not sure which files are causing that exactly. Resolv.conf is changing but I believe it's a symlink in Ubuntu and generated automatically. As far as I can tell the problem only happens now (in Webmin 1.782) after a forced "power loss" kind of reboot.

I'm not using Cockpit.

[iliajie]

http://askubuntu.com/questions/157154/how-do-i-include-lines-in-resolv-conf-that-wont-get-lost-on-reboot

[philmck]

Thanks for your help qooob, but the consensus there seems to be to configure nameservers in /etc/network/interfaces. But the DNS settings in that file are changing in this situation and I suspect that's what causes resolv.conf to change in turn.