root@Ubuntu14:~# cat /etc/resolv.conf

# Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)

#     DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN

nameserver 100.100.2.138

nameserver 100.100.2.136

options timeout:2 attempts:3 rotate single-request-reopen

root@Ubuntu14:~#

root@Ubuntu14:~# cat /etc/resolv.conf

# Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)

#     DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN

nameserver 100.100.2.138

nameserver 100.100.2.136

options timeout:2 attempts:3 rotate single-request-reopen

root@Ubuntu14:~# vim /etc/resolvconf/resolv.conf.d/base

root@Ubuntu14:~# cat !$

cat /etc/resolvconf/resolv.conf.d/base

nameserver 223.5.5.5

nameserver 223.6.6.6

root@Ubuntu14:~# resolvconf -u

root@Ubuntu14:~# cat /etc/resolv.conf

# Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)

#     DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN

nameserver 100.100.2.138

nameserver 100.100.2.136

nameserver 223.5.5.5

options timeout:2 attempts:3 rotate single-request-reopen

root@Ubuntu14:~# nslookup www.baidu.com

Server:         100.100.2.138

Address:        100.100.2.138#53

Non-authoritative answer:

www.baidu.com   canonical name = www.a.shifen.com.

Name:   www.a.shifen.com

Address: 220.181.112.244

Name:   www.a.shifen.com

Address: 220.181.111.188

root@Ubuntu14:~#

root@iZbp1b66g5htibj2m7yyv3Z:~# cat /etc/network/interfaces

auto lo

iface lo inet loopback

auto eth0

iface eth0 inet dhcp

dns-nameservers 223.5.5.5   # 在最后添加这一行

root@iZbp1b66g5htibj2m7yyv3Z:~# /etc/init.d/nscd restart

 * Restarting Name Service Cache Daemon nscd                                                                                                                                                                                          [ OK ]

root@iZbp1b66g5htibj2m7yyv3Z:~#  /etc/init.d/networking restart

stop: Job failed while stopping

start: Job is already running: networking

root@iZbp1b66g5htibj2m7yyv3Z:~# dig |grep SERVER

;; SERVER: 100.100.2.138#53(100.100.2.138)

root@iZbp1b66g5htibj2m7yyv3Z:~# nslookup www.baidu.com

Server:         100.100.2.138

Address:        100.100.2.138#53

Non-authoritative answer:

www.baidu.com   canonical name = www.a.shifen.com.

Name:   www.a.shifen.com

Address: 220.181.111.188

Name:   www.a.shifen.com

Address: 220.181.112.244

root@iZbp1b66g5htibj2m7yyv3Z:~#

coreos1 ~ # cat /etc/resolv.conf

# This file is managed by man:systemd-resolved(8). Do not edit.

#

# This is a dynamic resolv.conf file for connecting local clients directly to

# all known DNS servers.

#

# Third party programs must not access this file directly, but only through the

# symlink at /etc/resolv.conf. To manage man:resolv.conf(5) in a different way,

# replace this symlink by a static file or a different symlink.

#

# See man:systemd-resolved.service(8) for details about the supported modes of

# operation for /etc/resolv.conf.

nameserver 223.5.5.5

nameserver 223.6.6.6

search openstacklocal

coreos1 ~ # cat /etc/systemd/resolved.conf

#  This file is part of systemd.

#

#  systemd is free software; you can redistribute it and/or modify it

#  under the terms of the GNU Lesser General Public License as published by

#  the Free Software Foundation; either version 2.1 of the License, or

#  (at your option) any later version.

#

# Entries in this file show the compile time defaults.

# You can change settings by editing this file.

# Defaults can be restored by simply deleting this file.

#

# See resolved.conf(5) for details

[Resolve]

DNS=223.5.5.5 223.6.6.6　　　　　　# 用空格分隔多个dns

#FallbackDNS=

#Domains=

LLMNR=no　　　　　　　　　　　　　　　# yes改为no

#DNSSEC=allow-downgrade

#Cache=yes

coreos1 ~ # systemctl restart systemd-resolved

coreos1 ~ # dig |grep SERVER

;; SERVER: 223.5.5.5#53(223.5.5.5)

coreos1 ~ # reboot