The DNS configured during guest customization does not persist at reboot for CentOS 6.3.

[velvetsky]

Hello,

I have made a template out of classic CentOS 6.3 destribution. When I say classic I mean a plain install, without any extra configuration made.

After I provision an instance out of this template everything is apparently good. Just after the first restart the machine looses the configured DNS.

After the provisioning /etc/resolv.conf has the following content:

# generated by customize-guest script
nameserver 8.8.8.8

After I reboot the machine /etc/resolv.conf changes to:

# Generated by NetworkManager


# No nameservers found; try putting DNS servers into your
# ifcfg files in /etc/sysconfig/network-scripts like so:
#
# DNS1=xxx.xxx.xxx.xxx
# DNS2=xxx.xxx.xxx.xxx
# DOMAIN=lab.foo.com bar.foo.com

Does anyone have any hints about what may cause this behaviour?

Thanks.

[milton123]

You may nor save your configuration file thats why when you restart the machine your Network configurations including DNS configuration gone. You have to save your configurations like this command :X!= That means save and exit.

Cheers, Udin

[velvetsky]

Thanks for the answer milton123 but I don't really understand what I should save.

Also, note that the machine is provisioned for a client, so he should not be forced to performed further modifications to keep the settings.

It might be worth mentioning that I also have a simillar CentOS 5.6 template and it's working perfectly.

[velvetsky]

The culprit for this was the NetworkManger. Once disabled everything worked as expected.