HowTo use Grub rescue mode

Sometimes when you upgrade or migrate your linux from one disk to another, boot should hang out on line  "grub rescue>",

what now ?

Configure different DNS resolvers for domains in Ubuntu

This is simple How-To which describe how to configure Ubuntu to use different DNS servers for various domains. It's very useful feature when you want to connect to your office VPN and use office DNS servers for intranet domain but for other domains you want to use your own or your ISP DNS servers.

Situation:

• domain.intra - resolve hosts from dns server 192.168.30.1


• home.intra - resolve hosts from this domain from 192.168.0.1


• other domains resolve from your default DNS server (ISP, or home etc.)