How To Change your DNS on Linux

EdwardonSeptember 5, 2016May 24, 2020

If you want to hard-code DNS Servers to use on CentOS or Debian, it has 2 methods.

Configure static DNS with GUI Network manager ( Ubuntu Desktop )
Configure static DNS in /etc/sysconfig/network-scripts/ifcfg-eth0 (Default is eth0)
1. By the way, just edit the config file by following cmd
  $ sudo vi /etc/sysconfig/network-scripts/ifcfg-eth0
```
DEVICE=eth0
BOOTPROTO=dhcp
ONBOOT=yes
PEERDNS=no
```
  Then, add static DNS to /etc/resolv.conf
  $ sudo vi /etc/resolv.conf
```
nameserver 8.8.8.8
nameserver 8.8.4.4
```
2. Method 2 (DHCP)
  $ sudo vi /etc/sysconfig/network-scripts/ifcfg-eth0
```
DEVICE=eth0
BOOTPROTO=dhcp
ONBOOT=yes
DNS1=8.8.8.8
DNS2=8.8.4.4
```
  The DNS servers specified with "DNS1/DNS2" directives will then automatically be added to /etc/resolv.conf when the interface is activated. So there is no need to modify /etc/resolv.conf yourself.
3. Fixed IP
```
DEVICE=eth0
BOOTPROTO=manual
ONBOOT=yes
IPADDR=10.0.1.27
NETWORK=10.0.1.0
NETMASK=255.255.255.0
DNS1=8.8.8.8
DNS2=8.8.4.4
```