背景: 因为安全问题需要升级openssh 服务等,为了保险起见在更新过程中需要先设置telnetl连接已防更新失败后服务器不能连接
1、下载 telnet telnet-server xinetd (需要配置好yum 原)
yum -y install telnet telnet-server xinetd
2、注释 /etc/pam.d/login ( pam_securetty.so 行)
root@localhost ~]# head /etc/pam.d/login
#%PAM-1.0
#auth [user_unknown=ignore success=ok ignore=ignore default=bad] pam_securetty.so
auth substack system-auth
auth include postlogin
account required pam_nologin.so
account include system-auth
password include system-auth
#pam_selinux.so close should be the first session rule
session required pam_selinux.so close
session required pam_loginuid.so
3、移除/etc/securetty 文件
mv /etc/securetty /etc/securetty.bak
4、设置服务开机自启
systemctl start telnet.socket xinetd.service
systemctl enable telnet.socket xinetd.service
测试连接可以用:
telnet 10.x.x.x 23 (再输入密码看是否可以连接)
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