【Linux】su root出现Authentication failure

这是因为root默认未激活，应该是刚安装系统还未激活吧，手动激活一下（换root密码也可以用这个方法）：

[ht@localhost ~]$ sudo passwd[sudo] password for ht:         //输入你的用户密码Changing password for user root.New password:                  //输入root新密码BAD PASSWORD: The password fails the dictionary check - it is based on a dictionary wordRetype new password:           //重新输入root密码passwd: all authentication tokens updated successfully.[hansight@localhost ~]$ su     //现在就可以用su命令到root了Password:                      //用你刚刚新换的密码[root@localhost hansight]#