CentOS 6.X# cat /etc/sysconfig/network-scripts/ifcfg-eth0
DEVICE=eth0
TYPE=Ethernet
onBOOT=yes
BOOTPROTO=dhcp
DNS1=8.8.8.8
DNS2=168.126.63.1
# rm -f /etc/resolv.conf
# ifdown eth0; ifup eth0
# cat /etc/resolv.conf
; generated by /sbin/dhclient-script
search novalocal
nameserver 8.8.8.8
nameserver 168.126.63.1
Ubuntu 14.04 LTS
/etc/dhcp/dhclient.conf 수정
:: DHCP 에서 정의된 DNS 이외에 설정한 DNS 서버 추가
supersede domain-name-servers 8.8.8.8, 168.126.63.1;
:: DHCP 에서 정의한 DNS 무시하고 설정한 DNS 서버만 추가
prepend domain-name-servers 8.8.8.8, 168.126.63.1;
# ifdown eth0; ifup eth0
# cat /etc/resolv.conf
domain novalocal
search novalocal
nameserver 8.8.8.8
nameserver 168.126.63.1
nameserver 1XX.XXX.XXX.225 # supersede 설정했을 경우
