1、背景

因为系统为了安装，需要升级openssh，会影响ssh连接，固要安装telnet服务，否则系统连接不上，只能重装了

2、安装telnet服务

2.1、检测xinetd是否安装

rpm -qa xinetd

yum install xinetd -y #没有则安装

2.2、安装telnet服务端

yum install telnet-server -y

2.3、安装telnet客户端

yum install telnet -y

chkconfig telnet on #设置开机启动

#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

}

systemctl restart xinetd.service

firewall-cmd --permanent --add-port=23/tcp

firewall-cmd --reload

netstat -tnl |grep 23

#vi /etc/securetty #文件最后加入

pts/0

pts/1

7、测试验证

客户端安装telnet: yum install telnet -y

telnet 192.168.52.19 23