telnet服务

# 安装服务

rpm -qa | grep xinetd    「 xinetd轻量级服务管理」 

yum install -y telnet

yum install -y telnet-server

 

# 开机自启

systemctl list-unit-files | grep telnet    「 系统服务 」 

telnet@.service                               static
telnet.socket                                 enabled

 

systemctl enable telnet.socket

systemctl start telnet.socket

systemctl status telnet.socket

chkconfig telnet.socket on    「 centos7 不再支持chkconfig」 

error reading information on service telnet.socket: No such file or directory

 

which telnet

/usr/bin/telnet

 

# 开放端口

iptables -I INPUT -p tcp --dport 23 -jACCEPT

iptables -I INPUT -p udp --dport 23 -jACCEPT

iptables -L -n

• -L --list
• -n --numeric

service iptables save    「 iptables-save > /etc/sysconfig/iptables 」 

iptables: Saving firewall rules to /etc/sysconfig/iptables:[  OK  ]

 

service iptables restart

 

# 端口可用

telnet {IP} {port}