给阿里云Linux服务器解决yum源遇到的问题

我在执行脚本的时候，报错如下：

Loaded plugins: fastestmirror, langpacks, update-motd
Loading mirror speeds from cached hostfile

One of the configured repositories failed (CentOS-2.1903 - Base - mirrors.aliyun.com),
and yum doesn't have enough cached data to continue. At this point the only
safe thing yum can do is fail. There are a few ways to work "fix" this:

 1. Contact the upstream for the repository and get them to fix the problem.
    
 2. Reconfigure the baseurl/etc. for the repository, to point to a working
    upstream. This is most often useful if you are using a newer
    distribution release than is supported by the repository (and the
    packages for the previous distribution release still work).
    
 3. Run the command with the repository temporarily disabled
        yum --disablerepo=base ...
    
 4. Disable the repository permanently, so yum won't use it by default. Yum
    will then just ignore the repository until you permanently enable it
    again or use --enablerepo for temporary usage:
    
        yum-config-manager --disable base
    or
        subscription-manager repos --disable=base
    
 5. Configure the failing repository to be skipped, if it is unavailable.
    Note that yum will try to contact the repo. when it runs most commands,
    so will have to try and fail each time (and thus. yum will be be much
    slower). If it is a very temporary problem though, this is often a nice
    compromise:
    
        yum-config-manager --save --setopt=base.skip_if_unavailable=true

failure: repodata/repomd.xml from base: [Errno 256] No more mirrors to try.
http://mirrors.cloud.aliyuncs.com/centos/2.1903/os/x86_64/repodata/repomd.xml: [Errno 14] HTTP Error 404 - Not Found
http://mirrors.aliyun.com/centos/2.1903/os/x86_64/repodata/repomd.xml: [Errno 14] HTTP Error 404 - Not Found
http://mirrors.aliyuncs.com/centos/2.1903/os/x86_64/repodata/repomd.xml: [Errno 12] Timeout on http://mirrors.aliyuncs.com/centos/2.1903/os/x86_64/repodata/repomd.xml: (28, 'Connection timed out after 30001 milliseconds')
http://mirrors.aliyuncs.com/centos/2.1903/os/x86_64/repodata/repomd.xml: [Errno 12] Timeout on http://mirrors.aliyuncs.com/centos/2.1903/os/x86_64/repodata/repomd.xml: (28, 'Connection timed out after 30001 milliseconds')
http://mirrors.aliyuncs.com/centos/2.1903/os/x86_64/repodata/repomd.xml: [Errno 12] Timeout on http://mirrors.aliyuncs.com/centos/2.1903/os/x86_64/repodata/repomd.xml: (28, 'Connection timed out after 30001 milliseconds')
http://mirrors.aliyuncs.com/centos/2.1903/os/x86_64/repodata/repomd.xml: [Errno 12] Timeout on http://mirrors.aliyuncs.com/centos/2.1903/os/x86_64/repodata/repomd.xml: (28, 'Connection timed out after 30000 milliseconds')
http://mirrors.aliyuncs.com/centos/2.1903/os/x86_64/repodata/repomd.xml: [Errno 14] curl#56 - "Callback aborted"

解决方法如下：

将 CentOS-Base.repo 文件中所有 $releasever 替换成 7 就好了

1、编辑 CentOS-Base.repo 文件

vim /etc/yum.repos.d/CentOS-Base.repo

2、输入冒号 : ，继续输入 %s/$releasever/7/g，按回车键替换

:%s/$releasever/7/g

3、再次输入冒号 :，继续输入 wq， 按回车键退出并保存

:wq

4、替换后的文件内容如下：


gpgcheck=1
gpgkey=http://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-7

#additional packages that may be useful
[extras]
name=CentOS-7 - Extras - mirrors.aliyun.com
failovermethod=priority
baseurl=http://mirrors.aliyun.com/centos/7/extras/$basearch/
        http://mirrors.aliyuncs.com/centos/7/extras/$basearch/
        http://mirrors.cloud.aliyuncs.com/centos/7/extras/$basearch/
gpgcheck=1
gpgkey=http://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-7

#additional packages that extend functionality of existing packages
[centosplus]
name=CentOS-7 - Plus - mirrors.aliyun.com
failovermethod=priority
baseurl=http://mirrors.aliyun.com/centos/7/centosplus/$basearch/
        http://mirrors.aliyuncs.com/centos/7/centosplus/$basearch/
        http://mirrors.cloud.aliyuncs.com/centos/7/centosplus/$basearch/
gpgcheck=1
enabled=0
gpgkey=http://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-7

#contrib - packages by Centos Users
[contrib]
name=CentOS-7 - Contrib - mirrors.aliyun.com
failovermethod=priority
baseurl=http://mirrors.aliyun.com/centos/7/contrib/$basearch/
        http://mirrors.aliyuncs.com/centos/7/contrib/$basearch/
        http://mirrors.cloud.aliyuncs.com/centos/7/contrib/$basearch/
gpgcheck=1
enabled=0
gpgkey=http://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-7
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