我在 Ubuntu 14.04.2 LTS trusty 中有时会遇到 DNS 解析问题。
我已经使用网络管理器配置了系统，使其能够使用静态 IP 分配。我也尝试过更改 DNS 服务器地址，但当出现此问题时，我无法通过 URL 访问任何网站，只能通过 IP 访问。
在遇到这个问题时，我尝试过
- 停止 dnsmasq 服务
- 删除 dnsmasq
- 重启网络服务
- 重启网络管理器
- nslookup 到 google、yahoo 等域名
转储脚本的输出
###### Start of debugging information for resolvconf ######
### ls -l /etc/resolvconf
total 16
-rw-r--r-- 1 root root 172 Dec 13 2012 interface-order
drwxr-xr-x 2 root root 4096 May 21 11:02 resolv.conf.d
drwxr-xr-x 2 root root 4096 May 21 10:57 update.d
drwxr-xr-x 2 root root 4096 Jul 23 2014 update-libc.d
### cat /etc/resolvconf/interface-order
# interface-order(5)
lo.inet*
lo.dnsmasq
lo.pdnsd
lo.!(pdns|pdns-recursor)
lo
tun*
tap*
hso*
em+([0-9])?(_+([0-9]))*
p+([0-9])p+([0-9])?(_+([0-9]))*
eth*
ath*
wlan*
ppp*
*
### ls -l /etc/resolvconf/resolv.conf.d
total 8
-rw-r--r-- 1 root root 1 May 19 10:08 base
-rw-r--r-- 1 root root 151 Dec 13 2012 head
### cat /etc/resolvconf/resolv.conf.d/base
### cat /etc/resolvconf/resolv.conf.d/head
# 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
### ls -l /etc/resolvconf/run
ls: cannot access /etc/resolvconf/run: No such file or directory
### ls -l /run/resolvconf
total 4
-rw-r--r-- 1 root root 0 Jun 10 12:41 enable-updates
drwxr-xr-x 2 root root 60 Jun 10 12:42 interface
-rw-r--r-- 1 root root 170 Jun 10 12:42 resolv.conf
### cat /run/resolvconf/enable-updates
### cat /run/resolvconf/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 8.8.8.8
### ls -l /run/resolvconf/interface
total 4
-rw-r--r-- 1 root root 19 Jun 10 12:42 NetworkManager
### cat /run/resolvconf/interface/NetworkManager
nameserver 8.8.8.8
### ls -l /etc/resolv.conf
lrwxrwxrwx 1 root root 29 May 21 11:09 /etc/resolv.conf -> ../run/resolvconf/resolv.conf
### lsattr /etc/resolv.conf
lsattr: Operation not supported While reading flags on /etc/resolv.conf
### 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 8.8.8.8
### cat /etc/NetworkManager/NetworkManager.conf
[main]
plugins=ifupdown,keyfile,ofono
#dns=dnsmasq
no-auto-default=E0:69:95:AB:91:5A,
[ifupdown]
managed=false
###### End of debugging information for resolvconf ######
我无法通过执行所有这些操作来解决问题。但唯一的解决方案是重新启动我的计算机。
请帮助我，因为它会因重新启动系统和随时失去连接而完全卡住我的整个工作。
非常感谢您的帮助。
凯文。
答案1
我按照以下步骤操作，我的问题解决了。
删除 dnsmasq：
apt-get remove --purge dnsmasqdns=dnsmasq通过输入#来注释掉/etc/NetworkManager/NetworkManager.conf。注释掉本地DNS地址。
prepend domain-name-servers 127.0.0.1;通过输入#进行注释/etc/dhcp/dhclient.conf更新
resolvconf：resolvconf -u重新开始
network-manager或者重启系统：service network-manager restart
答案2
尝试这个
注释掉/etc/NetworkManager/NetworkManager.conf以下行dns=dnsmasq
sudo nano /etc/NetworkManager/NetworkManager.conf
[main]
plugins=ifupdown,keyfile,ofono
#dns=dnsmasq
并重新启动 NetworkManager 服务。
sudo restart network-manager
然后
sudo rm -f /etc/resolv.conf # Delete the symbolic link
和
sudo nano /etc/resolv.conf
# Content of static resolv.conf
nameserver 8.8.4.4
nameserver 8.8.8.8
这样你的电脑将无需dnsmasqDNS 服务器即可解析名称/etc/resolv.conf