源配置

tips:
yum配置文件路径

/etc/yum.repos.d/centos.repo

1.备份源配置 [Very Important!]

mv /etc/yum.repos.d/centos.repo /etc/yum.repos.d/centos.repo.backup

2.Clean Cache:

yum clean all

3.Backup the Old CentOS-Base.repo
If exist this file.

cd /etc/yum.repos.d/
mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup

4.Create the new CentOS-Base.repo file with vim or other editor , and save to the directory '/etc/yum.repos.d/'  fill with the following contents below:

    # CentOS-Base.repo## The mirror system uses the connecting IP address of the client and the# update status of each mirror to pick mirrors that are updated to and# geographically close to the client.  You should use this for CentOS updates# unless you are manually picking other mirrors.## If the mirrorlist= does not work for you, as a fall back you can try the # remarked out baseurl= line instead.##[base]name=CentOS-$releasever - Base - mirrors.aliyun.com#failovermethod=prioritybaseurl=https://mirrors.aliyun.com/centos-stream/$stream/BaseOS/$basearch/os/http://mirrors.aliyuncs.com/centos-stream/$stream/BaseOS/$basearch/os/http://mirrors.cloud.aliyuncs.com/centos-stream/$stream/BaseOS/$basearch/os/gpgcheck=1gpgkey=https://mirrors.aliyun.com/centos-stream/RPM-GPG-KEY-CentOS-Official#additional packages that may be useful#[extras]#name=CentOS-$releasever - Extras - mirrors.aliyun.com#failovermethod=priority#baseurl=https://mirrors.aliyun.com/centos-stream/$stream/extras/$basearch/os/#        http://mirrors.aliyuncs.com/centos-stream/$stream/extras/$basearch/os/#        http://mirrors.cloud.aliyuncs.com/centos-stream/$stream/extras/$basearch/os/#gpgcheck=1#gpgkey=https://mirrors.aliyun.com/centos-stream/RPM-GPG-KEY-CentOS-Official#additional packages that extend functionality of existing packages[centosplus]name=CentOS-$releasever - Plus - mirrors.aliyun.com#failovermethod=prioritybaseurl=https://mirrors.aliyun.com/centos-stream/$stream/centosplus/$basearch/os/http://mirrors.aliyuncs.com/centos-stream/$stream/centosplus/$basearch/os/http://mirrors.cloud.aliyuncs.com/centos-stream/$stream/centosplus/$basearch/os/gpgcheck=1enabled=0gpgkey=https://mirrors.aliyun.com/centos-stream/RPM-GPG-KEY-CentOS-Official[PowerTools]name=CentOS-$releasever - PowerTools - mirrors.aliyun.com#failovermethod=prioritybaseurl=https://mirrors.aliyun.com/centos-stream/$stream/PowerTools/$basearch/os/http://mirrors.aliyuncs.com/centos-stream/$stream/PowerTools/$basearch/os/http://mirrors.cloud.aliyuncs.com/centos-stream/$stream/PowerTools/$basearch/os/gpgcheck=1enabled=0gpgkey=https://mirrors.aliyun.com/centos-stream/RPM-GPG-KEY-CentOS-Official[AppStream]name=CentOS-$releasever - AppStream - mirrors.aliyun.com#failovermethod=prioritybaseurl=https://mirrors.aliyun.com/centos-stream/$stream/AppStream/$basearch/os/http://mirrors.aliyuncs.com/centos-stream/$stream/AppStream/$basearch/os/http://mirrors.cloud.aliyuncs.com/centos-stream/$stream/AppStream/$basearch/os/gpgcheck=1gpgkey=https://mirrors.aliyun.com/centos-stream/RPM-GPG-KEY-CentOS-Official

Press the “ESC” key and input “:wq” to save and quit vim, if you use vim.

阿里源配置, ok5. 更新缓存 

  yum makecache && yum update

or, you can use the follow tow commands.

yum makecache

then

yum update

Waiting for the “Complete!” notice in your terminal.

6.Finished.