vCenter: How to reset root password on vCenter Server Appliance 6.5

Use the following step by step guide to reset the lost or forgotten root password in vCenter Server Appliance 6.5:

  • Take a snapshot or backup of the vCenter Server Appliance 6.5 before proceeding. (Do not skip this step.)
  • Reboot the vCenter Server Appliance 6.5.
  • After the OS starts, loading the Photon splash press e key to enter the GNU GRUB Edit Menu.
  • Locate the line that begins with the word Linux.
    Append these entries to the end of the line as per screenshot below:
rw init=/bin/bash
  • Press F10 to continue booting.
  • In the Command prompt, enter the command passwd and provide a new root password (twice for confirmation):
passwd
  • Unmount the filesystem by running this command:
umount /
  • Reboot the vCenter Server Appliance 6.5 by running this command:
reboot -f 
  • Confirm that you can access the vCenter Server Appliance 6.5 using the new root password.
  • Remove the snapshot taken in Step 1 if applicable.

More information: VMware

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