yum安装包时报错：
Could not retrieve mirrorlist http://mirrorlist.repoforge.org/el6/mirrors-rpmforge error was
: PYCURL ERROR - "couldn't connect to host"
http://apt.sw.be/redhat/el6/en/x86_64/rpmforge/repodata/repomd.xml: [Errno 14]
PYCURL ERROR - "couldn't connect to host"
Trying other mirror.
Error: Cannot retrieve repository metadata (repomd.xml) for repository: rpmforge.
Please verify its path and try again
解决办法：
1、下载新的CentOS-Base.repo 到/etc/yum.repos.d/【版本是5.*的下载5、6.*下载6、7.*下载7】
[root@localhost ~]# wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
2、然后执行以下命令：
[root@localhost ~]# rpm -e rpmforge-release --nodeps
[root@localhost ~]# yum clean all
[root@localhost ~]# yum update