Ubuntu18.04修改dns

root@office-com-kvm-sec_ningdun-01:~# mv /etc/resolv.conf /etc/resolv.conf.bak
root@office-com-kvm-sec_ningdun-01:~# ln -s /run/resolvconf/resolv.conf /etc/resolv.conf
root@office-com-kvm-sec_ningdun-01:~# echo "nameserver 192.168.123.2" >> /etc/resolvconf/resolv.conf.d/head 
root@office-com-kvm-sec_ningdun-01:~# sudo resolvconf -u
root@office-com-kvm-sec_ningdun-01:~# cat /etc/resolv.conf