【linux运维】centos7.9中配置Telnet连接方式
背景:
在业务中经常遇到等保需要升级ssh的情况,为了防止升级失败后远程不上,需要提前配置telnet连接方式。
1.安装Telnet(Telnet依赖于xinetd服务)
[root@mail-63 ~]# yum install xinetd telnet-server -y
注:检查配置文件,如果存在/etc/xinetd.d/telnet 文件则需要修改配置使 root 用户可以通过 telnet 登
陆,如果不存在该文件则无需配置。我这里没有这个文件,所以跳过。
2.配置Telnet登陆的终端类型,在配置文件末端添加以下终端。
[root@mail-63 ~]# vim /etc/securetty
pts/0
pts/1
pts/2
pts/3
3、重启telnet服务
[root@zabbixserver xinetd.d]# systemctl start xinetd.service && systemctl start telnet.socket
4、查看对应端口服务是否运行
[root@zabbixserver xinetd.d]# ss -ntlp|grep "23"
LISTEN 0 128 *:10051 *:* users:(("zabbix_server",pid=1524,fd=4),("zabbix_server",pid=1523,fd=4),("zabbix_server",pid=1522,fd=4),("zabbix_server",pid=1521,fd=4),("zabbix_server",pid=1520,fd=4),("zabbix_server",pid=1519,fd=4),("zabbix_server",pid=1518,fd=4),("zabbix_server",pid=1517,fd=4),("zabbix_server",pid=1516,fd=4),("zabbix_server",pid=1515,fd=4),("zabbix_server",pid=1514,fd=4),("zabbix_server",pid=1513,fd=4),("zabbix_server",pid=1512,fd=4),("zabbix_server",pid=1502,fd=4),("zabbix_server",pid=1501,fd=4),("zabbix_server",pid=1500,fd=4),("zabbix_server",pid=1499,fd=4),("zabbix_server",pid=1498,fd=4),("zabbix_server",pid=1497,fd=4),("zabbix_server",pid=1496,fd=4),("zabbix_server",pid=1495,fd=4),("zabbix_server",pid=1494,fd=4),("zabbix_server",pid=1493,fd=4),("zabbix_server",pid=1492,fd=4),("zabbix_server",pid=1491,fd=4),("zabbix_server",pid=1490,fd=4),("zabbix_server",pid=1489,fd=4),("zabbix_server",pid=1488,fd=4),("zabbix_server",pid=1487,fd=4),("zabbix_server",pid=1486,fd=4),("zabbix_server",pid=1485,fd=4),("zabbix_server",pid=1484,fd=4),("zabbix_server",pid=1483,fd=4),("zabbix_server",pid=967,fd=4))
LISTEN 0 50 *:3306 *:* users:(("mysqld",pid=1239,fd=14))
LISTEN 0 128 [::]:23 [::]:* users:(("systemd",pid=1,fd=46))
4、连接测试