下载bin-DVD版的才有packet目录，方便搭建yum本地源。
CentOS-6.7-x86_64-bin-DVD1.iso
1，yum本地源
[base] name=base baseurl=file:///mnt/ enabled=1 gpgcheck=0
2，换为外网源
wget -O /etc/yum.repos.d/CentOS-Base.repo -0 下载并以不同的文件名保存
wget http://mirrors.163.com/.help/CentOS6-Base-163.repo [root@localhost ~]# cd /etc/yum.repos.d/ [root@localhost ~]# mv CentOS-Base.repo CentOS-Base.repo.bak [root@localhost ~]# mv CentOS6-Base-163.repo CentOS-Base.repo
yum clean all yum makecache yum update #一般没必要 yum list |grep xxx yum search xxx yum grouplist yum group install “包名”
