====== Interrupt The Boot Process In Order To Gain Access To A System ======

**General Information**

**If you cannot perform this procedure, you will fail the entire exam**. 

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Recover the root user's password
  - Interrupt boot process at grub menu (move an arrow key up or down to stop the grub boot countdown)
  - Press "e" to edit the grub menu entry
  - Navigate to the line starting with "linux16"; this is the kernel
  - Append to the end of the kernel entry (Ctrl+e to go to the end of the line)<code bash>rd.break enforcing=0</code>
    - rd.break => stops early in the boot process (when initramfs is in memory and has not mounted the root file system as rw yet)
    - enforcing=0 => set SELinux to permissive mode
  - Ctrl+x to continue boot process, it will stop within the initramfs shell
  - Remount the sysroot file system as read/write<code bash>mount -o remount,rw /sysroot</code>
  - Change root to that root file system<code bash>chroot /sysroot</code>
  - Change root password<code bash>passwd</code>
  - Exit the chroot jail and initramfs shell<code bash>sh-4.2# exit
switch_root:/# exit</code>
  - The system will continue to boot
    - **Note**: There may be a considerable delay where it looks like nothing is happening, be patient.
  - Login as root with the new password
  - Restore SELinux file context to /etc/shadow<code bash>restorecon -v /etc/shadow</code>
  - Set SELinux to enforcing again<code bash>setenforce 1</code>

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