VMWare Centos7 无法连接网络

纪念以下，耗时一整天连不上外网自己出现的一系列错误

案例：安装好虚拟机进行yum操作时出现：

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

于是从网上查找各种资料，方法很多

方法1.   原因：没有配置resolv.conf

解决方法:

到/etc目录下配置resolv.conf加入nameserver IP,如：

nameserver 8.8.8.8

nameserver 8.8.4.4

search localdomain

保存再次运行上面命令就可以   

试了试，未能解决我的问题，接下来另一种方法

 

 

方法2

使用vi打开DNS的配置文件进行修改:

      在命令提示符中输入: vi  /etc/sysconfig/network-scripts/ifcfg-eth33

用vi 打开这个文件后，接下来会出现截图的内容, 其中要注意两个配置(按下面的值去设置)，如果不会使用vi的同学，请自行google或者百度用法。

              ONBOOT=yes

               MM_CONTROLLED=no

       

设置好后。

重启CentOS后一切就正常了。

试了试，未能解决我的问题，接下来另一种方法

 

 

 

终于重装了好多次发现了错误

在安装centos7 的时候，打开：NETWORK&HOST NAME中的连接时没有连接上

IP信息就是不出来，查看了好多帖子，用了好多办法仍然出现下面的情况，很绝望

 

最后发现原来是虚拟机没有配好造成的错误，一定要勾选上！！！！！

勾选之后就可以啦

进入之后，yum指令也能够正常运行了

导致这种问题的原因可能不同，请根据自己实际情况解决！！