zoukankan      html  css  js  c++  java
  • 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
    
    
    
    
    

      

  • 相关阅读:
    web前端的发展态势
    AngularJs 简单入门
    css代码优化篇
    git提交报错:Please make sure you have the correct access rights and the repository exists.
    Activiti工作流框架学习
    遍历map集合的4种方法
    js设置日期、月份增加减少
    Invalid character found in the request target. The valid characters are defined in RFC 7230 and RFC 3986
    webservice_rest接口_学习笔记
    相互匹配两个list集合+动态匹配${}参数
  • 原文地址:https://www.cnblogs.com/karl-python/p/9225484.html
Copyright © 2011-2022 走看看