我要评论yum无法安装epel-release
在学习hadoop的过程中准备环境时需要安装epel-release
在安装之前ping了一下www.baidu.com 发现能ping通，然后就去安装了，然后就发现问题了
去网上搜了一下然后感觉应该是镜像源的问题，
尝试了第一种方法
修改了/etc/yum.repos.d目录下的centos-base.rep文件，将文件中的原有内容改为
# centos-base.repo
#
# the mirror system uses the connecting ip address of the client and the
# update status of each mirror to pick mirrors that are updated to and
# geographically close to the client. you should use this for centos updates
# unless you are manually picking other mirrors.
#
# if the mirrorlist= does not work for you, as a fall back you can try the
# remarked out baseurl= line instead.
#
#
[base]
name=centos-$releasever - base
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=os&infra=$infra
#baseurl=http://mirror.centos.org/centos/$releasever/os/$basearch/
#baseurl=http://vault.centos.org/7.9.2009/x86_64/os/
baseurl=http://vault.centos.org/7.9.2009/os/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/rpm-gpg-key-centos-7
#released updates
[updates]
name=centos-$releasever - updates
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=updates&infra=$infra
#baseurl=http://mirror.centos.org/centos/$releasever/updates/$basearch/
#baseurl=http://vault.centos.org/7.9.2009/x86_64/os/
baseurl=http://vault.centos.org/7.9.2009/updates/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/rpm-gpg-key-centos-7
#additional packages that may be useful
[extras]
name=centos-$releasever - extras
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=extras&infra=$infra
#$baseurl=http://mirror.centos.org/centos/$releasever/extras/$basearch/
#baseurl=http://vault.centos.org/7.9.2009/x86_64/os/
baseurl=http://vault.centos.org/7.9.2009/extras/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/rpm-gpg-key-centos-7
#additional packages that extend functionality of existing packages
[centosplus]
name=centos-$releasever - plus
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=centosplus&infra=$infra
#baseurl=http://mirror.centos.org/centos/$releasever/centosplus/$basearch/
#baseurl=http://vault.centos.org/7.9.2009/x86_64/os/
baseurl=http://vault.centos.org/7.9.2009/centosplus/$basearch/
gpgcheck=1
enabled=0
gpgkey=file:///etc/pki/rpm-gpg/rpm-gpg-key-centos-7然后执行
sudo yum clean all sudo yum makecache
然后我的这两个命令就都加载失败了，我觉得就是这个不行
但是我把后续的解决方法放到下面，有人成功了可以继续往下试试
再执行
curl -o /etc/yum.repos.d/centos-base.repo https://mirrors.aliyun.com/repo/centos-7.repo
然后查看一下centos-base.repo`中的地址是否改成阿里云的了
cat centos-base.repo`
再此尝试导入wget命令 好的成功了
第二种方法（我就是用这种方法解决的）
#建议是备份一下 rm -rf /etc/yum.repos.d mkdir /etc/yum.repos.d wget http://mirrors.aliyun.com/repo/centos-7.repo cp centos-7.repo /etc/yum.repos.d/centos-base.repo #安装 rpm -ivh wget-1.14-15.el7_4.1.x86_64.rpm yum clean all yum makecache
总结
以上为个人经验，希望能给大家一个参考，也希望大家多多支持代码网。
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