CentOS 7 中 pptpd安装

直接在centos7安装pptpd会失败，以下方法可以解决:

1.先安装EPEL源: 

----官方源直接安装

CentOS/RHEL 5 ：

rpm -Uvh https://dl.fedoraproject.org/pub/epel/epel-release-latest-5.noarch.rpm

CentOS/RHEL 6 ：

rpm -Uvh https://dl.fedoraproject.org/pub/epel/epel-release-latest-6.noarch.rpm

CentOS/RHEL 7 ：

rpm -Uvh https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm

2.yum update;

3.yum install pptpd

安装成功。