>>破解密码
1.Reboot the system.---(重启系统)
2.Interrupt the boot loader count down by pressing anykey.
3.Move the cursor to the entry that needs to be booted.
4.Press “e” to edit the select edentry.---（按e键 进入命令行界面）
5.Move the cursor to the kernel command line(the line that start swith linux16. （将光标移动到 linux 16 的末尾处）
6.Append rd.break---（添加rd.break）
7.Press Ctrl+x to start.
8.Remount /sysroot as read-write.
switch_root:/# mount -o remount,rw /sysroot（以读写方式重新挂载根下sysroot）
9.Switch into a chroot jail, where /sysroot is treated as the root of the filesystem tree
switch_root:/# chroot /sysroot
10.Set a new root password:
sh-4.2# passwd [root] (change the root password)
sh-4.2# passwd -d root (delete the root password)
11.Make sure that all unlabeled files (including/etc/shadow at this point)get relabeled during boot.
sh-4.2# touch /.autorelabel
12. sh-4.2# exit
13. switch_root:/# exit
破解root密码：
1、重启虚拟机+ e 键
2、在linux16末尾加上 rd.break ctrl+x执行
3、mount -o remount,rw /sysroot
4、chroot /sysroot
5、passwd root
6、输入新密码：
7、确认密码
8、touch /.autorelabel
9、exit
10、exit
