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:
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.
Before the GRUB menu appears, the switch goes through the boot cycle. Do not interrupt this autoboot process when you see the following lines; wait until you see the GRUB menu.
... USB0: Bringing USB2 host out of reset... Net: eth-0 SF: MX25L6405D with page size 4 KiB, total 8 MiB Hit any key to stop autoboot: 2
GNU GRUB version 2.02+dfsg1-20 +----------------------------------------------------------------------------+ |*Cumulus Linux GNU/Linux | | Advanced options for Cumulus Linux GNU/Linux | | ONIE | | | +----------------------------------------------------------------------------+
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) | | | +----------------------------------------------------------------------------+
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
Sync the
/etc
directory, then reboot the system:root@switch:~# sync root@switch:~# reboot -f Restarting the system.