yum下载不了软件问题的解决办法

Loaded plugins: fastestmirror Loading mirror speeds from cached hostfile yum 安装软件问题解决办法

系统：Centos 7.9
CentOS-7-x86_64-Minimal-2009.iso

错误内容：

Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
Could not retrieve mirrorlist http://mirrorlist.centos.org/?release=7&arch=x86_64&repo=os&infra=stock error was
14: curl#6 - "Could not resolve host: mirrorlist.centos.org; Unknown error"


 One of the configured repositories failed (Unknown),
 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=<repoid> ...

     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 <repoid>
        or
            subscription-manager repos --disable=<repoid>

     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=<repoid>.skip_if_unavailable=true

Cannot find a valid baseurl for repo: base/7/x86_64

尝试后的解决成功办法如下：

重装yum

卸载yum：rm -rf yum-cli/ yum-plugins/
rpm -qa | grep yum
rpm –qa | grep yum | xargs rpm –e --nodeps

重新下载yum

https://mirrors.aliyun.com/centos/7.9.2009/os/x86_64/Packages

下载内容：
python-iniparse-0.4-9.el7.noarch.rpm
yum-metadata-parser-1.1.4-10.el7.x86_64.rpm
yum-3.4.3-168.el7.centos.noarch.rpm
yum-plugin-fastestmirror-1.1.31-54.el7_8.noarch.rpm

安装：

rpm -ivh yum-* --nodeps
rpm -ivh python-iniparse-0.4-9.el7.noarch.rpm  --nodeps [需要卸载的yum文件名]

#查看重新安装后的yum源

rpm -qa yum

清除缓存并重新构建yum源

yum clean all
yum makecache

重构时还是报错：

Could not retrieve mirrorlist http://mirrorlist.centos.org/?release=7&arch=x86_64&repo=os&infra=stock error was
14: curl#6 - "Could not resolve host: mirrorlist.centos.org; Unknown error"


 One of the configured repositories failed (Unknown),
 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=<repoid> ...

     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 <repoid>
        or
            subscription-manager repos --disable=<repoid>

     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=<repoid>.skip_if_unavailable=true

Cannot find a valid baseurl for repo: base/7/x86_64

提示mirrorlist.centos.org 不在被支持
解决办法:
修改 CentOS 系统中的 YUM 仓库配置文件:

sudo sed -i s/mirror.centos.org/vault.centos.org/g /etc/yum.repos.d/*.repo
sudo sed -i s/^#.*baseurl=http/baseurl=https/g /etc/yum.repos.d/*.repo
sudo sed -i s/^mirrorlist=http/#mirrorlist=https/g /etc/yum.repos.d/*.repo

升级所有可更新软件包

yum upgrade -y

更新完后：

yum 能正常安装软件了。

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