记录解决yum报错：Cannot retrieve metalink for repository: epel/x86_64

在使用Linux系统的VPS、服务器过程当中，有时我们可能会遇到使用yum命名时出现“Cannot retrieve metalink for repository: epel/x86_64. Please verify its path and try again”错误，详细错误信息如下，那么如何解决“Cannot retrieve metalink for repository: epel/x86_64. ”错误呢？

 One of the configured repositories failed (未知),
 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. Disable the repository, 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 

     4. 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=.skip_if_unavailable=true

Cannot retrieve metalink for repository: epel/x86_64. Please verify its path and try again

解决方法可以试试修改“/etc/yum.repos.d”文件夹中的“epel.repo”文件。修改内容如下：

如果你系统“epel.repo”文件当中原内容如下，

[epel]
name=Extra Packages for Enterprise Linux 7 - $basearch
#baseurl=http://download.fedoraproject.org/pub/epel/7/$basearch
metalink=https://mirrors.fedoraproject.org/metalink?repo=epel-7&arch=$basearch
failovermethod=priority
enabled=1
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-7

我们只需要把“metalink=https://mirrors.fedoraproject.org/metalink?repo=epel-7&arch=$basearch”前面加“#”号注释掉，并且把“#baseurl=http://download.fedoraproject.org/pub/epel/7/$basearch”取消注释！修改如下即可，一般这个问题就能得到解决了。

[epel]
name=Extra Packages for Enterprise Linux 7 - $basearch
baseurl=http://download.fedoraproject.org/pub/epel/7/$basearch
#metalink=https://mirrors.fedoraproject.org/metalink?repo=epel-7&arch=$basearch
failovermethod=priority
enabled=1
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-7