Single User Mode - Password Recovery

Use single user mode to assist in troubleshooting system boot issues or for password recovery.

To enter single user mode:

  1. Boot the switch, then as soon as you see the GRUB menu, use the arrow keys to select Advanced options for Cumulus Linux GNU/Linux.

                    GNU GRUB  version 2.02+dfsg1-20
    
    +----------------------------------------------------------------------------+
    |*Cumulus Linux GNU/Linux                                                    |
    | Advanced options for Cumulus Linux GNU/Linux                               |
    | ONIE                                                                       |
    |                                                                            |
    +----------------------------------------------------------------------------+
    
  2. Select Cumulus Linux GNU/Linux, with Linux 4.19.0-cl-1-amd64 (recovery mode).

                    GNU GRUB  version 2.02+dfsg1-20
    
    +----------------------------------------------------------------------------+
    | Cumulus Linux GNU/Linux, with Linux 4.19.0-cl-1-amd64                       |
    |*Cumulus Linux GNU/Linux, with Linux 4.19.0-cl-1-amd64 (recovery mode)       |
    |                                                                            |
    +----------------------------------------------------------------------------+  
    
  3. Press ctrl-d to reboot.

  4. After the system reboots, set a new root password. The root user provides complete control over the switch.

    root@switch:~# passwd
    Enter new UNIX password:
    Retype new UNIX password:
    passwd: password updated successfully
    

    You can take this opportunity to reset the password for the cumulus account.

    root@switch:~# passwd cumulus
    Enter new UNIX password:
    Retype new UNIX password:
    passwd: password updated successfully
    
  5. Sync the /etc directory, then reboot the system:

    root@switch:~# sync
    root@switch:~# reboot -f
    Restarting the system.