cannot find a valid baseurl for repo:base/7/x86_64 修复

升级centos7，执行sudo yum update（sudo yum update --skip-broken）

出现cannot find a valid baseurl for repo:base/7/x86_64 错误提示

靠谱的解决办法

**检查网络是否正常：命令行执行 ping www.50yun.net

如果能够ping通说明网络没有问题。那么十有八九就是yum仓库源的问题。

推荐使用阿里云开源镜像源（或者国内其他镜像源）

/etc/yum.repos.d/CentOS-Base.repo

修改该路径文件 CentOS-Base.repo

将文件中的内容替换为

[base]

name=CentOS-$releasever - Base - mirrors.aliyun.com

baseurl=http://mirrors.aliyun.com/centos/$releasever/os/$basearch/

gpgcheck=1

gpgkey=http://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-7

[updates]

name=CentOS-$releasever - Updates - mirrors.aliyun.com

baseurl=http://mirrors.aliyun.com/centos/$releasever/updates/$basearch/

gpgcheck=1

gpgkey=http://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-7

[extras]

name=CentOS-$releasever - Extras - mirrors.aliyun.com

baseurl=http://mirrors.aliyun.com/centos/$releasever/extras/$basearch/

gpgcheck=1

gpgkey=http://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-7

[centosplus]

name=CentOS-$releasever - Plus - mirrors.aliyun.com

baseurl=http://mirrors.aliyun.com/centos/$releasever/centosplus/$basearch/

gpgcheck=1

enabled=0

gpgkey=http://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-7