报错信息
One of the configured repositories failed (CentOS-7 - Addons - sohu.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. Disable the repository, 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 addons
4. 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=addons.skip_if_unavailable=true
failure: repodata/repomd.xml from addons: [Errno 256] No more mirrors to try.
http://mirrors.sohu.com/centos/7/addons/x86_64/repodata/repomd.xml: [Errno 14] HTTP Error 404 - Not Found
http://mirror.centos.org/centos/7/addons/x86_64/repodata/repomd.xml: [Errno 14] HTTP Error 404 - Not Found
解决方案
1. 请先确定你是无法联网还是配置问题。
ping www.baidu.com 如果是正常ping那可以看这个帖子完成配置
https://blog.csdn.net/weicuidi/article/details/52935100
2. 如果是 ping 有问题，那就：
1. 在Linux系统中输入命令: vi /etc/sysconfig/network-scripts/ifcfg-ens33
2. 修改文件中的ONBOOT=no,将no改为yes
3. 重启服务: service network restart
在测试 ping 再去yum 应该可以了