1、查看是否安装了相关软件:
rpm -qa|grep -E "telnet|xinetd"
显示结果含有以下三个软件,则表示已经安装,否则需要安装缺失的软件
telnet-server-0.17-60.el7.x86_64
telnet-0.17-60.el7.x86_64
xinetd-2.3.15-13.el7.x86_64
2、安装缺失的软件:
sudo yum install telnet telnet-server xinetd
3、注册使用服务:
sudo systemctl enable telnet.socket
sudo systemctl start telnet.socket
sudo systemctl enable xinetd
sudo systemctl start xinetd
4、开启防火墙的23端口:
具体防火墙使用可以参见:http://www.cnblogs.com/moxiaoan/p/5683743.html
sudo firewall-cmd --zone=public --add-port=23/tcp --permanent
sudo service firewalld restart
5、xinetd启动成功,可以查看xinetd的运行情况。【非必须】
[root@iZ94imebuqwZ ~]# netstat -tnlp 【或使用netstat -tnl | grep 23只查看目标端口】 Active Internet connections (only servers) |
[hadoop@mini3 ~]$ netstat -tnlp
(Not all processes could be identified, non-owned process info
will not be shown, you would have to be root to see it all.)
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name
tcp 0 0 0.0.0.0:50020 0.0.0.0:* LISTEN 3872/java
tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN -
tcp 0 0 127.0.0.1:25 0.0.0.0:* LISTEN -
tcp 0 0 0.0.0.0:50010 0.0.0.0:* LISTEN 3872/java
tcp 0 0 0.0.0.0:50075 0.0.0.0:* LISTEN 3872/java
tcp6 0 0 :::22 :::* LISTEN -
tcp6 0 0 :::23 :::* LISTEN -
tcp6 0 0 ::1:25 :::* LISTEN
6、备注:虚拟机如果和主机进行测试,需要将网络模式修改为2. Bridged Adapter,具体参见:http://blog.csdn.net/ixidof/article/details/12685549