CentOS:
[root@clovem ~]# yum install telnet-server -y //安裝telnet服務端[root@clovem ~]# cat /etc/xinetd.d/telnet //開啟telnet的托管服務# default: on# description: The telnet server serves telnet sessions; it uses /#unencrypted username/password pairs for authentication.service telnet{flags= REUSEsocket_type= streamwait= nouser= rootserver= /usr/sbin/in.telnetdlog_on_failure+= USERIDdisable= no //將yes改為no}[root@clovem ~]# service xinetd restart //重啟托管服務使配置文件生效如下操作使root用戶登錄生效
[root@clovem ~]# mv /etc/securetty /etc/securetty.bak
這樣， root 就可以直接進入 Linux 主機了。不過，建議不要這樣做。也可以在普通用戶進入后，切換到root用戶,擁有root的權限。
Red Hat Enterprise Linux AS release 4
需要修改：krb5-telnet
[root@rawlnx ~]# cat /etc/xinetd.d/krb5-telnet# default: off# description: The kerberized telnet server accepts normal telnet sessions, /# but can also use Kerberos 5 authentication.service telnet{flags= REUSEsocket_type= streamwait= nouser= rootserver= /usr/kerberos/sbin/telnetdlog_on_failure+= USERIDdisable= no}配置完成，重啟xinetd 服務
solaris：將本文件的CONSOLE一行注釋，直接生效
-bash-3.00# cat /etc/default/login |grep CONSOLE# If CONSOLE is set, root can only login on that device.#CONSOLE=/dev/console
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