On Fri, May 26, 2017 at 04:54:03PM +0200, Günther J. Niederwimmer wrote:

Hello,

why it is always a Problem when a kernel, firewall or KVM update is installed ?

I have a system with a server CentOS 7 (last) and 6 KVM Clients after the Update Installation and reboot the most in Network is not functional ?

I lost NIC's and the firewalld change the zone ......

I have always to control is the KVM Clients working ?

Have any a idea what is wrong on my system ?

Thanks for a answer,

No solid answer, I seldom see such an effect.

One possibility, many services have a default config file installed with the service. They also may have a "local" config file that takes precedence if present. "local" may be done by location or by a specifice name variation.

If you are configuring your services by modifying the default config file, it may be overwritten by an update.

jon