Yum update 之后CentOS 8 failovermethod和appstream报错

LINUX版本：

原因：执行完yum update 系统更新到Centos 8 ,出现如下错误

• AppStream错误

  Errors during downloading metadata for repository 'appstream':
  - Curl error (6): Couldn't resolve host name for http://mirrorlist.centos.org/?release=8&arch=x86_64&repo=AppStream&infra=stock [Could not resolve host: mirrorlist.centos.org]
  Error: Failed to download metadata for repo 'appstream': Cannot prepare internal mirrorlist: Curl error (6): Couldn't resolve host name for http://mirrorlist.centos.org/?release=8&arch=x86_64&repo=AppStream&infra=stock [Could not resolve host: mirrorlist.centos.org]

• failovermethod错误

  Invalid configuration value: failovermethod=priority in /etc/yum.repos.d/CentOS-Epel.repo; Configuration: OptionBinding with id "failovermethod" does not exist
  Repository epel is listed more than once in the configuration

解决方案：

1. failovermethod处理
   需要在/etc/yum.repos.d/CentOS-Epel.repo删掉failovermethod选项

failovermethod=priority

2. 执行：

• cd /etc/yum.repos.d/
• sed -i 's/mirrorlist/#mirrorlist/g' /etc/yum.repos.d/CentOS-*
• sed -i 's|#baseurl=http://mirror.centos.org|baseurl=http://vault.centos.org|g' /etc/yum.repos.d/CentOS-*

处理完再去执行我们自己的命令
yum -y install systat

最后就正常了

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