yum安装openssh
1、安装openssh
#yum install -y openssh
2、安装openssh-server
#yum install -y openssh-server
3、安装openssh-clients
#yum install -y openssh-clients
4、centos7 启动openssh
#systemctl start sshd.services
centos6 启动openssh
#/etc/init.d/sshd start
centos7 的启动没有/etc/init.d/sshd 只有 /etc/init.d/README
/etc/init.d/README 中描述了，cnetos7 要用systemctl 启动