Booting the BMC Discovery appliance in rescue mode on Oracle Linux 9

On Oracle Linux 9 systems, the rescue boot option loads the rescue kernel but then starts all services, including the Discovery services. If you need to boot in a single user mode with only essential system services running, you must specify a rescue target for systemd.

  • The grub user is: root
  • The default grub password is: B00tl0ad3r!

To specify a rescue target for systemd:

  1. At the GRUB boot screen press e to modify the boot options.
  2. Enter the grub user when prompted
  3. Enter the grub password when prompted.
  4. Scroll to the linux16 entry and add the following parameter at the end of the line: 
    systemd.unit=rescue.target
  5. Press Ctrl+X to boot the system into rescue mode.

To change the grub password

You must be the root user to change the grub password.

  1. Enter:
    # grub2-mkpasswd-pbkdf2You are prompted to enter the password
  2. Then edit /boot/grub2/user.cfg and replace the value after: GRUB2_PASSWORD=
    GRUB2_PASSWORD=<replace here>

 

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