CentOS自定义yum源

根据 CentOS 7 配置yum阿里源 （三步即可）-阿里云开发者社区操作步骤报时报错

 [root@localhost yum.repos.d]# yum makecache
 已加载插件：fastestmirror, langpacks
 Determining fastest mirrors
  * base: mirrors.aliyun.com
  * extras: mirrors.aliyun.com
  * updates: mirrors.aliyun.com
 http://mirrors.aliyun.com/centos/7/os/aarch64/repodata/repomd.xml: [Errno 14] HTTP Error 404 - Not Found
 正在尝试其它镜像。
 To address this issue please refer to the below wiki article
 ​
 https://wiki.centos.org/yum-errors
 ​
 If above article doesn't help to resolve this issue please use https://bugs.centos.org/.
 ​
 http://mirrors.aliyuncs.com/centos/7/os/aarch64/repodata/repomd.xml: [Errno 12] Timeout on http://mirrors.aliyuncs.com/centos/7/os/aarch64/repodata/repomd.xml: (28, 'Connection timed out after 30002 milliseconds')
 正在尝试其它镜像。

直接在web上使用以上地址访问，发现报错

http://mirrors.aliyuncs.com/centos/7/os/aarch64/repodata/repomd.xml

而直接使用http://mirrors.aliyun.com/centos/ 地址则没有问题，应此阿里云yum源已经发生了变化

为此我们可以自己定义一个yum 源

cd /etc/yum.repos.d/

vi /etc/yum.repos.d/CentOS-Base-Aliyun.repo

 [base]
 name=CentOS-$releasever - Base - mirrors.aliyun.com
 baseurl=http://mirrors.aliyun.com/centos/7.9.2009/os/x86_64/
 gpgcheck=1
 gpgkey=http://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-7
 ​
 #released updates 
 [updates]
 name=CentOS-$releasever - Updates - mirrors.aliyun.com
 baseurl=http://mirrors.aliyun.com/centos/7.9.2009/updates/x86_64/
 gpgcheck=1
 gpgkey=http://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-7
 ​
 #additional packages that may be useful
 [extras]
 name=CentOS-$releasever - Extras - mirrors.aliyun.com
 baseurl=http://mirrors.aliyun.com/centos/7.9.2009/extras/x86_64/
 gpgcheck=1
 gpgkey=http://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-7

 ​添加完了后，验证如下：

[root@localhost yum.repos.d]# yum clean all
已加载插件：fastestmirror, langpacks
正在清理软件源： base extras local updates
Cleaning up list of fastest mirrors
[root@localhost yum.repos.d]# yum makecache
已加载插件：fastestmirror, langpacks
Determining fastest mirrors
base                                                                                                                                                       | 3.6 kB  00:00:00
extras                                                                                                                                                     | 2.9 kB  00:00:00
local                                                                                                                                                      | 3.6 kB  00:00:00
updates                                                                                                                                                    | 2.9 kB  00:00:00
(1/14): base/group_gz                                                                                                                                      | 153 kB  00:00:00
(2/14): base/primary_db                                                                                                                                    | 6.1 MB  00:00:01
(3/14): extras/primary_db                                                                                                                                  | 253 kB  00:00:00
(4/14): local/group_gz                                                                                                                                     | 153 kB  00:00:00
(5/14): local/filelists_db                                                                                                                                 | 6.1 MB  00:00:00
(6/14): extras/other_db                                                                                                                                    | 154 kB  00:00:00
(7/14): local/primary_db                                                                                                                                   | 4.9 MB  00:00:00
(8/14): local/other_db                                                                                                                                     | 2.1 MB  00:00:00
(9/14): extras/filelists_db                                                                                                                                | 305 kB  00:00:00
(10/14): base/other_db                                                                                                                                     | 2.6 MB  00:00:00
(11/14): updates/filelists_db                                                                                                                              |  15 MB  00:00:05
(12/14): base/filelists_db                                                                                                                                 | 7.2 MB  00:00:07
(13/14): updates/other_db                                                                                                                                  | 1.6 MB  00:00:00
(14/14): updates/primary_db                                                                                                                                |  27 MB  00:00:11
元数据缓存已建立
[root@localhost yum.repos.d]#

配置本地yum 源

在CentOS 7中配置本地YUM源的操作步骤如下： ​

 •挂载ISO镜像•
 创建挂载目录（如/opt/centos），执行命令：
 mkdir /opt/centos  
 mount /dev/cdrom /opt/centos  # 物理光驱  
 # 或挂载ISO文件：  
 mount -o loop /path/to/CentOS-7-x86_64-Everything.iso /opt/centos  
 ​

1. 确保镜像内容可访问‌

2. ‌配置repo文件‌ 在/etc/yum.repos.d/目录创建新文件（如local.repo），内容为：

    [local]
    name=Local Yum
    baseurl=file:///opt/centos  # 与挂载点一致
    enabled=1
    gpgcheck=0

‌更新YUM缓存‌ 清理旧缓存并生成新数据：

 yum clean all  
 yum makecache  

‌设置开机挂载（可选）‌ 编辑/etc/fstab文件，添加：

 /dev/cdrom /opt/centos iso9660 defaults 0 0