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===== Hostname, DNS =====

==== Hostname ====
  
  /etc/hosts                                   #Configuration of lokal DNS-resolving
  /etc/HOSTNAME                                #Configuration of System Hostname

==== DNS ====
Following files are the local DNS-config files:

  /etc/resolv.conf                             #Configuration of DNS-Servers
  /etc/nsswitch.conf                           #Configuration how a service or a command is getting DNS-Adress (via /etc/hosts or /etc/resolv.conf)
  /etc/hosts                                   #Configuration hosts file (local DNS resolution)

DNS-Name-Cache-Daemon Service on SLES-Linux:
  nscd                         
  
Example resolv.conf

<code>
#DNS-SUFFIX for DNS resolving 
search site.example.com site.example.de       

#List of nameservers to add
nameserver 1.2.3.4
nameserver 2.3.4.5
</code>

==== DNS-Server ====

[[Linux:BIND]]
  
==== DNS-/ DHCP / dhclient.conf====

If you want to **override** the DNS servers **provided by DHCP entirely** and force the system to use the ones you provide, use the **supersede** entry:

  /etc/dhcp/dhclient.conf
  supersede domain-name-servers 127.0.0.1;
  supersede domain-name-servers 12.34.56.78, 12.34.56.79; 
<code>
cat /etc/resolv.conf
nameserver 127.0.0.1
</code>

"**prepend**" add servers to those provided by dhcp (work as a fallback):

  prepend domain-name-servers 12.34.56.78, 12.34.56.79;