CentOS7 执行yum 命令出错 One of the configured repositories 如何解决

新安装的一台云服务器, 执行yum命令出现了错误， One of the configured repositories failed (Unknown), 最后是Cannot retrieve metalink for repository: epel/x86_64. Please verify its path and try again 。完整的错误信息是：

这里重点是最后一行 for repository: epel/x86_64. 说明是这个仓储出了问题。

解决办法1 删除这个仓库

rm -f mv /etc/yum.repos.d/epel.repo
这样执行yum命令就可以正确的执行。不过少了 epel 仓库好多软件包不能用。
这里介绍
第二种解决方法
查看了

cat /etc/yum.repos.d/epel.repo

[epel]
name=Extra Packages for Enterprise Linux 7 - $basearch
#baseurl=http://download.fedoraproject.org/pub/epel/7/$basearch
mirrorlist=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

[epel-debuginfo]
name=Extra Packages for Enterprise Linux 7 - $basearch - Debug
#baseurl=http://download.fedoraproject.org/pub/epel/7/$basearch/debug
mirrorlist=https://mirrors.fedoraproject.org/metalink?repo=epel-debug-7&arch=$basearch
failovermethod=priority
enabled=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-7
gpgcheck=1

[epel-source]
name=Extra Packages for Enterprise Linux 7 - $basearch - Source
#baseurl=http://download.fedoraproject.org/pub/epel/7/SRPMS
mirrorlist=https://mirrors.fedoraproject.org/metalink?repo=epel-source-7&arch=$basearch
failovermethod=priority
enabled=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-7
gpgcheck=1
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28

然后测试了一下网络

[root@lampfree.com ~]# ping download.fedoraproject.org
ping: download.fedoraproject.org: Name or service not known
[root@lampfree.com ~]# ping mirrors.fedoraproject.org
ping: mirrors.fedoraproject.org: Name or service not known
1
2
3
4

发现网络不通，这里就需要解决网络问题。
修改dns
cat /etc/resolv.conf

nameserver 8.8.8.8
1