记录下LINUX机器无法使用yum的解决经过

发布于 2018-01-15  1.97k 次阅读


朋友给了台机器用,不知道你们会不会,反正我进去的第一件事就是yum update。

然后返回的内容是

[[email protected] ~]# yum update
已加载插件:fastestmirror
http://mirrors.163.com/centos/7/os/x86_64/repodata/repomd.xml: [Errno 14] curl#6 - "Could not resolve host: mirrors.163.com; 未知的错误"
正在尝试其它镜像。
One of the configured repositories failed (CentOS-7 - Base - 163.com),
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=base ...
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 base
or
subscription-manager repos --disable=base
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=base.skip_if_unavailable=true
failure: repodata/repomd.xml from base: [Errno 256] No more mirrors to try.
http://mirrors.163.com/centos/7/os/x86_64/repodata/repomd.xml: [Errno 14] curl#6 - "Could not resolve host: mirrors.163.com; 未知的错误"

根据网上的办法,进入/etc/sysconfig/network-scripts/中的ifcfg-eth0 中的ONBOOT=no改为yes
可是我的ONBOOT就是yes,仔细想想,是不是因为源有问题,于是将默认源换成网易“爸爸”的。
运行后还是一样,想了想是不是因为域名的解析问题?
在/etc/sysconfig/network-scripts/中的ifcfg-eth0中 发现了一行配置

DNS1=1.1.1.1

What? 1.1.1.1是什么鬼DNS。。
于是将1.1.1.1改为8.8.8.8
再加入一行

DNS2=8.8.4.4

完美解决XD

本文想表达的点是:
如果yum install * 等 无法使用并且提示这种错误,不是host解析有问题就是DNS,检查网络和DNS设置,重启网络服务,懒的可以直接REBOOT就OK啦!