[root@localhost app]# rpm -qa | grep telnet

[root@localhost app]# yum -y install telnet telnet-server

[root@localhost app]# vim /etc/xinetd.d/telnet

# default: on
# description: The telnet server serves telnet sessions; it uses \
#      unencrypted username/password pairs for authentication.
service telnet
{
       flags          = REUSE
       socket_type    = stream
       wait          = no
       user          = root
       server         = /usr/sbin/in.telnetd
       log_on_failure  += USERID
       disable        = no
}

[root@localhost app]# service xinetd restart
停止 xinetd：                                       [失败]
正在启动 xinetd：                                   [确定]
设置telnet 服务开机自启动
[root@localhost app]# chkconfig telnet on