安装PHP5.6源

[xiaokang@localhost ~]$ sudo rpm -Uvh http://mirror.webtatic.com/yum/el7/epel-release.rpm
[sudo] password for xiaokang: 
Retrieving http://mirror.webtatic.com/yum/el7/epel-release.rpm
curl: (6) Could not resolve host: mirror.webtatic.com; Unknown error
error: skipping http://mirror.webtatic.com/yum/el7/epel-release.rpm - transfer failed

报错：
curl: (6) Could not resolve host: mirror.webtatic.com; Unknown error
error: skipping http://mirror.webtatic.com/yum/el7/epel-release.rpm - transfer failed

DNS解析的问题，处理办法：
vim /etc/resolv.conf 加入：
nameserver 8.8.8.8
nameserver 8.8.4.4
search localdomain

[xiaokang@localhost ~]$ sudo vim /etc/resolv.conf
[sudo] password for xiaokang: 

再次安装就可以成功安装

[xiaokang@localhost ~]$ sudo rpm -Uvh http://mirror.webtatic.com/yum/el7/epel-release.rpm
Retrieving http://mirror.webtatic.com/yum/el7/epel-release.rpm
warning: /var/tmp/rpm-tmp.c6v5OS: Header V4 RSA/SHA1 Signature, key ID 62e74ca5: NOKEY
Preparing...                          ################################# [100%]
	package epel-release-7-11.noarch (which is newer than epel-release-7-5.noarch) is already installed