【Linux】centos 7 开启telnet

• 安装telnet-server及telnet服务
  yum install -y telnet-server* telnet

• 安装xinetd服务
  yum install -y xinetd

• 修改配置文件，没有则创建 vi /etc/xinetd.d/telnet

# default: yes
# description: The telnet server servestelnet 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
}

• 允许root用户telnet 登录,配置telnet登录的终端类型，在/etc/securetty文件末尾增加一些pts终端

pts/0
pts/1
pts/2
pts/3

查看

• 启动xinetd及telnet并做开机自启动

systemctl enable xinetd.service
systemctl enable telnet.socket
systemctl start telnet.socket
systemctl start xinetd.service

• 检验23端口是否可用
  netstat -tnl |grep 23

• 验证配置

  • 不重启验证

   telnet localhost
  

• 重启服务器验证