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1.CentOS Yum 源配置文件 CentOS-Base.repo 的完整内容示例：

以下是适用于不同版本 CentOS 系统的 CentOS-Base.repo 文件的标准模板。这些模板基于常见的国内镜像源（如阿里云、清华大学等），可以帮助解决仓库配置失败的问题。

适用于centos 7的CentOS-Base.repo：

[base]
name=CentOS-$releasever - Base - Mirrors Aliyun
baseurl=http://mirrors.aliyun.com/centos/$releasever/os/$basearch/
gpgcheck=1
enabled=1
gpgkey=http://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-7[updates]
name=CentOS-$releasever - Updates - Mirrors Aliyun
baseurl=http://mirrors.aliyun.com/centos/$releasever/updates/$basearch/
gpgcheck=1
enabled=1
gpgkey=http://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-7[extras]
name=CentOS-$releasever - Extras - Mirrors Aliyun
baseurl=http://mirrors.aliyun.com/centos/$releasever/extras/$basearch/
gpgcheck=1
enabled=1
gpgkey=http://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-7[centosplus]
name=CentOS-$releasever - Plus - Mirrors Aliyun
baseurl=http://mirrors.aliyun.com/centos/$releasever/centosplus/$basearch/
gpgcheck=1
enabled=0
gpgkey=http://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-7

此配置文件使用了阿里云的镜像源。

2.适用于centos 8的CentOS-Base.repo:

[baseos]
name=CentOS-$releasever - BaseOS - Mirrors Tuna Tsinghua
baseurl=https://mirrors.tuna.tsinghua.edu.cn/centos/$releasever/BaseOS/$basearch/os/
gpgcheck=1
enabled=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-centosofficial[appstream]
name=CentOS-$releasever - AppStream - Mirrors Tuna Tsinghua
baseurl=https://mirrors.tuna.tsinghua.edu.cn/centos/$releasever/AppStream/$basearch/os/
gpgcheck=1
enabled=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-centosofficial[extras]
name=CentOS-$releasever - Extras - Mirrors Tuna Tsinghua
baseurl=https://mirrors.tuna.tsinghua.edu.cn/centos/$releasever/extras/$basearch/os/
gpgcheck=1
enabled=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-centosofficial[powertools]
name=CentOS-$releasever - PowerTools - Mirrors Tuna Tsinghua
baseurl=https://mirrors.tuna.tsinghua.edu.cn/centos/$releasever/PowerTools/$basearch/os/
gpgcheck=1
enabled=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-centosofficial

此配置文件采用了清华大学开源软件镜像站作为镜像源。

2.通用性：

1. 将上述内容保存为 /etc/yum.repos.d/CentOS-Base.repo 文件。
2. 替换原有的 CentOS-Base.repo 文件后，执行以下命令刷新缓存：

sudo yum clean all
sudo yum makecache