CentOS更换源

• Centos 7 更换源：
  • 备份 mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup
  • 下载Repo文件 wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
  • 完成后执行
    • yum clear all
    • yum makecache

• Centos 8 更换源：
  • 备份
    • cp /etc/yum.repos.d/CentOS-AppStream.repo /etc/yum.repos.d/CentOS-AppStream.repo_bak
    • cp /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo_bak
    • cp /etc/yum.repos.d/CentOS-Extras.repo /etc/yum.repos.d/CentOS-Extras.repo_bak
  • 修改CentOS-AppStream.repo
    • # mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=AppStream&infra=$infra
    • baseurl=https://mirrors.aliyun.com/centos/$releasever/AppStream/$basearch/os/
  • 修改CentOS-Base.repo
    • # mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=BaseOS&infra=$infra
    • baseurl=https://mirrors.aliyun.com/centos/$releasever/BaseOS/$basearch/os/
  • 修改CentOS-Extras.repo
    • # mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=extras&infra=$infra
    • baseurl=https://mirrors.aliyun.com/centos/8.0.1905/extras/x86_64/os/
  • 完成后执行
    • dnf clear all
    • dnf makecache