RH124 Ch 12: Host Name and Name Resolution

WebAsha is renaming its lab servers into the `webasha.lab` domain. Give servera its new name and make sure it can find the file server by name.

Tasks

1. Set the permanent host name of servera to servera.webasha.lab.
2. Make the name fileserver.webasha.lab (short name fileserver) resolve to 172.25.250.11 on servera.
3. Add webasha.lab as a DNS search domain on connection eth1.
4. Save the IPv4 address that the name serverb resolves to on servera into ~/serverb-ip.txt.