1.执行安装语句

• yum -y install telnet-server.x86_64
• yum -y install telnet.x86_64
• yum -y install xinetd.x86_64

2.设置开机自启：

• systemctl enable xinetd.service
• systemctl enable telnet.socket

3,开启service：

• systemctl start telnet.socket
• systemctl start xinetd

 4.编辑vi /etc/securetty 允许 root 账号登陆末尾添加两行

pts/0

pts/1

pts/2

注意：允许3个终端登陆，第四个就拒绝了

强踢掉用户

1.查询who

2.pkill -kill -t pts/0