Ubuntu / CoreOS修改DNS配置
- 不要直接手动修改文件 /etc/resolv.conf
安装好Ubuntu之后设置了静态IP地址,再重启后就无法解析域名。想重新设置一下DNS,打开/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
内容是一段警告:说这个文件是resolvconf程序动态创建的,不要直接手动编辑,修改将被覆盖。
- 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:~#
ubuntu修改DNS有如下两种方法。
- 方法一:修改文件/etc/resolvconf/resolv.conf.d/base
- 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:~#
- 方法二:修改文件 /etc/network/interfaces
- 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
- 常用命令
linux刷新dns的缓存方法是: sudo /etc/init.d/nscd restart
最暴力的方法刷dns,重启网络: sudo /etc/init.d/networking restart
查看当前DNS解析情况:
nslookup www.baidu.com
dig | grep SERVER
- 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:~#
- CoreOS修改DNS
1) vim /etc/resolv.conf
2) vim /etc/systemd/resolved.conf
3) systemctl restart systemd-resolved
4) reboot
- 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
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