修改DNS以解决CentOS无法访问源

新开的服务器无法安装宝塔

[root@localhost ~]# yum install -y wget && wget -O install.sh http://download.bt.cn/install/install_6.0.sh && sh install.sh
Loaded plugins: fastestmirror
Could not retrieve mirrorlist http://mirrorlist.centos.org/?release=7&arch=x86_64&repo=os&infra=stock error was
14: curl#6 - "Could not resolve host: mirrorlist.centos.org; Unknown error"

 One of the configured repositories failed (Unknown),
 and yum doesn't have enough cached data to continue. At this point the only
 safe thing yum can do is fail. There are a few ways to work "fix" this:

     1. Contact the upstream for the repository and get them to fix the problem.

     2. Reconfigure the baseurl/etc. for the repository, to point to a working
        upstream. This is most often useful if you are using a newer
        distribution release than is supported by the repository (and the
        packages for the previous distribution release still work).

     3. Run the command with the repository temporarily disabled
            yum --disablerepo=<repoid> ...

     4. Disable the repository permanently, so yum won't use it by default. Yum
        will then just ignore the repository until you permanently enable it
        again or use --enablerepo for temporary usage:

            yum-config-manager --disable <repoid>
        or
            subscription-manager repos --disable=<repoid>

     5. Configure the failing repository to be skipped, if it is unavailable.
        Note that yum will try to contact the repo. when it runs most commands,
        so will have to try and fail each time (and thus. yum will be be much
        slower). If it is a very temporary problem though, this is often a nice
        compromise:

            yum-config-manager --save --setopt=<repoid>.skip_if_unavailable=true

Cannot find a valid baseurl for repo: base/7/x86_64

ping一下百度,提示域名无效。

[root@localhost ~]# ping www.baidu.com
ping: www.baidu.com: Name or service not known

很明显,服务器无法对域名DNS解析。这就简单了。

打开/etc/resolv.conf文件,修改内容为:

search 223.5.5.5 223.6.6.6
nameserver 223.5.5.5
nameserver 119.29.29.29

然后就ping www.baidu.com,问题解决。

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