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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

#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

DNS-Server

DNS-/ DHCP

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; 
cat /etc/resolv.conf
nameserver 127.0.0.1

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

prepend domain-name-servers 12.34.56.78, 12.34.56.79;
linux/host_dns.1708779680.txt.gz · Last modified: 2024/02/24 14:01 by tmade
 
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