Fedora安装sshd
先确认是否已安装ssh服务：
[root@localhost ~]# rpm -qa | grep openssh-server
openssh-server-5.3p1-19.fc12.i686 （这行表示已安装）
若未安装ssh服务，可输入：
#yum install openssh-server
进行安装
2、修改配置文件
#vi /etc/ssh/sshd_config
Port 22 监听的端口号，默认是22，可以自定义。
Protocol 2 支持的协议，默认就好，不用修改
PermitRootLogin yes 是否允许root直接登录，最好设置为no
MMaxAuthTries 6 最大登录数，默认是6，建议设置为3，防止别人密码穷举。
To start the sshd daemon, type the following at a shell prompt:
systemctl start sshd.service
To stop the running sshd daemon, use the following command:
systemctl stop sshd.service
If you want the daemon to start automatically at the boot time, type:
systemctl enable sshd.service
Refer to Chapter?7,?Services and Daemons for more information on how to configure services in Fedora.
