centos（6，7）系统下安装telnet

centos6

1.安装

yum -y install telnet-server telnet

2.启动telnet

vim /etc/xinetd.d/telnet

service telnet
{
        flags           = REUSE
        socket_type     = stream
        wait            = no
        user            = root
        server          = /usr/sbin/in.telnetd
        log_on_failure  += USERID
        disable         = yes     #将yes改为no
}

启动服务：

service xinetd start

3.检查服务是否启动：
netstat -nltp | grep 23

centos7

安装

yum -y install telnet-server

启动

systemctl start telnet.socket

注：telnet默认只能让非root用户连接