----------更换国内比较快的yum源-----------
----------163---------
cd /etc/yum.repos.d
mv CentOS-Base.repo CentOS-Base.repo.backup
wget http://mirrors.163.com/.help/CentOS6-Base-163.repo
mv CentOS6-Base-163.repo CentOS-Base.repo
//rm -rf cloudera-cdh5.repo
//wget http://archive.cloudera.com/cdh5/redhat/6/x86_64/cdh/cloudera-cdh5.repo
---------Peer cert cannot be verified or peer cert invalid错误---
vi /etc/yum.conf
---------yum.conf 增加参数 -------
sslverify=false
-------------------------------------
yum check-update
yum -y install openssh-clients #最小版centos安装ssh
