目录
1、备份
2、下载新的 CentOS-Base.repo 到 /etc/yum.repos.d/
3、测试
阿里镜像提供的配置方法：centos镜像_centos下载地址_centos安装教程-阿里巴巴开源镜像站
1、备份
[root@localhost ~]# mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup
2、下载新的 CentOS-Base.repo 到 /etc/yum.repos.d/
出现错误的原因：我在配置静态IP时，没有配置DNS服务器地址，导致本地无法将域名解析成IP地址，从而导致无法连接上阿里云服务器的镜像仓库。
重启网卡，使得修改的配置文件信息生效。重新下载，发现此时能成功下载了。
3、测试
[root@localhost ~]# yum install httpd -y
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile* base: mirrors.aliyun.com* extras: mirrors.aliyun.com* updates: mirrors.aliyun.com
http://mirrors.aliyuncs.com/centos/7/os/x86_64/repodata/repomd.xml: [Errno 14] curl#7 - "Failed connect to mirrors.aliyuncs.com:80; Connection refused"
Trying other mirror.
http://mirrors.cloud.aliyuncs.com/centos/7/os/x86_64/repodata/repomd.xml: [Errno 14] curl#6 - "Could not resolve host: mirrors.cloud.aliyuncs.com; Unknown error"
Trying other mirror.
base | 3.6 kB 00:00:00
extras | 2.9 kB 00:00:00
updates | 2.9 kB 00:00:00
Resolving Dependencies
--> Running transaction check
---> Package httpd.x86_64 0:2.4.6-99.el7.centos.1 will be installed
--> Processing Dependency: httpd-tools = 2.4.6-99.el7.centos.1 for package: httpd-2.4.6-99.el7.centos.1.x86_64
--> Processing Dependency: /etc/mime.types for package: httpd-2.4.6-99.el7.centos.1.x86_64
--> Processing Dependency: libaprutil-1.so.0()(64bit) for package: httpd-2.4.6-99.el7.centos.1.x86_64
--> Processing Dependency: libapr-1.so.0()(64bit) for package: httpd-2.4.6-99.el7.centos.1.x86_64
--> Running transaction check
---> Package apr.x86_64 0:1.4.8-7.el7 will be installed
---> Package apr-util.x86_64 0:1.5.2-6.el7_9.1 will be installed
---> Package httpd-tools.x86_64 0:2.4.6-99.el7.centos.1 will be installed
---> Package mailcap.noarch 0:2.1.41-2.el7 will be installed
--> Finished Dependency ResolutionDependencies Resolved==================================================================================================================================================================================================================Package Arch Version Repository Size
==================================================================================================================================================================================================================
Installing:httpd x86_64 2.4.6-99.el7.centos.1 updates 2.7 M
Installing for dependencies:apr x86_64 1.4.8-7.el7 base 104 kapr-util x86_64 1.5.2-6.el7_9.1 updates 92 khttpd-tools x86_64 2.4.6-99.el7.centos.1 updates 94 kmailcap noarch 2.1.41-2.el7 base 31 kTransaction Summary
==================================================================================================================================================================================================================
Install 1 Package (+4 Dependent packages)Total download size: 3.0 M
Installed size: 10 M
Downloading packages:
Delta RPMs disabled because /usr/bin/applydeltarpm not installed.
(1/5): apr-1.4.8-7.el7.x86_64.rpm | 104 kB 00:00:00
(2/5): apr-util-1.5.2-6.el7_9.1.x86_64.rpm | 92 kB 00:00:00
(3/5): httpd-tools-2.4.6-99.el7.centos.1.x86_64.rpm | 94 kB 00:00:00
(4/5): mailcap-2.1.41-2.el7.noarch.rpm | 31 kB 00:00:00
(5/5): httpd-2.4.6-99.el7.centos.1.x86_64.rpm | 2.7 MB 00:00:05
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Total 519 kB/s | 3.0 MB 00:00:05
Running transaction check
Running transaction test
Transaction test succeeded
Running transactionInstalling : apr-1.4.8-7.el7.x86_64 1/5 Installing : apr-util-1.5.2-6.el7_9.1.x86_64 2/5 Installing : httpd-tools-2.4.6-99.el7.centos.1.x86_64 3/5 Installing : mailcap-2.1.41-2.el7.noarch 4/5 Installing : httpd-2.4.6-99.el7.centos.1.x86_64 5/5 Verifying : httpd-2.4.6-99.el7.centos.1.x86_64 1/5 Verifying : mailcap-2.1.41-2.el7.noarch 2/5 Verifying : apr-1.4.8-7.el7.x86_64 3/5 Verifying : httpd-tools-2.4.6-99.el7.centos.1.x86_64 4/5 Verifying : apr-util-1.5.2-6.el7_9.1.x86_64 5/5 Installed:httpd.x86_64 0:2.4.6-99.el7.centos.1 Dependency Installed:apr.x86_64 0:1.4.8-7.el7 apr-util.x86_64 0:1.5.2-6.el7_9.1 httpd-tools.x86_64 0:2.4.6-99.el7.centos.1 mailcap.noarch 0:2.1.41-2.el7 Complete!
从上面的日志来看，确实是从阿里云的镜像站点下载了软件包。在YUM配置中，使用了默认的镜像站点作为软件包的下载源。
配置成功！
![[Linux]基础IO（上）--理解文件系统调用、文件描述符、万物皆文件](https://img-blog.csdnimg.cn/direct/62448da2ac8f41338beb4f2076cd486d.png)
