Linux Baidu Cloud Compute Entering Single User Mode to Reset Root Paasword

Background

If the password cannot be reset using the BCC console, use VNC to boot into single-user mode for the reset.

Risk Acknowledgements

Rebooting the server is required to access single-user mode for password reset. Evaluate the associated risks and backup important data before proceeding.

Enter single-user mode to reset password in CentOS 6

1. After connecting to the server via VNC, click Send Ctrl+Alt+Del in the upper right corner to reboot the server. After entering the reboot status, promptly press Esc to proceed to the next interface:

2. Press Esc to enter the Grub interface, and then press the e key:

3. After that, enter the following interface, select the red-marked Kernel by pressing arrow keys, and then press the e key.

4. Then, enter the following interface:

5. Add at the end: single console=tty, the modified content is as follows:

6. Press the Enter key to return to the previous interface, and then press the b key to initiate the boot:

7. Once the system restarts, it will enter single-user mode, allowing access without a password. You can modify passwords and carry out other operations in this mode.

8. Proceed with resetting the password.

To reset the root password, use the passwd command. For other users, reset the password using the format passwd user.

1$ passwd

The display of all authentication tokens updated successfully indicates successful password reset. Enter exit to exit single-user mode and return to normal mode.

Enter single-user mode to reset password in CentOS 7

1. Click Send Ctrl+Alt+Del in the upper right corner to reboot the server. After entering the reboot status, promptly press Esc quickly once the page below is displayed:

This page is displayed:

2. Locate the first Linux 16 section, change ro to rw, and add console=console init=/bin/sh at the end.

Press Ctrl+X to reboot and enter the single-user mode.

3. Proceed with resetting the password.

To reset the root password, use the passwd command. For other users, reset the password using the format passwd user.

1$ passwd

The display of all authentication tokens updated successfully indicates successful password reset. Enter exit to exit single-user mode and return to normal mode.

Enter single-user mode to reset password in CentOS 8

1. Click Send Ctrl+Alt+Del in the upper right corner to reboot the server. After entering the reboot status, promptly press Esc quickly once the page below is displayed:

This page is displayed:

2. Locate the first Linux section, change ro to rw, and add console=console init=/bin/sh at the end.

Press Ctrl+X to reboot and enter the single-user mode.

3. The following display confirms successful entry into single-user mode.

4. Proceed with resetting the password.

To reset the root password, use the passwd command. For other users, reset the password using the format passwd user.

1$ passwd

The display of all authentication tokens updated successfully indicates successful password reset. Enter exit to exit single-user mode and return to normal mode.

Enter Single-user mode to reset password in Ubuntu 18.04

1. Click the "Send Ctrl+Alt+Del" button in the upper right corner to reboot the server. After entering the reboot status, promptly press Esc quickly once the page below is displayed:

2. Locate the end of the Linux line, remove unnecessary parameters up to the parameter ro, modify ro to rw (attaching the root disk partition in read-write mode), and add init=/bin/bash.

3. Press Ctrl+X to reboot and enter the single-user mode.

4. Proceed with resetting the password.

To reset the root password, use the passwd command. For other users, reset the password using the format passwd user.

1$ passwd

The display of all authentication tokens updated successfully indicates successful password reset. Enter exit to exit single-user mode and return to normal mode.

Enter single-user mode to reset password in openSUSE 42.3

1. Click Send Ctrl+Alt+Del in the upper right corner to reboot the server. After entering the reboot status, promptly press Esc quickly once the page below is displayed:

This page is displayed:

2. Locate the first Linux section, and add console=console init=/bin/sh at the end.

Press Ctrl+X to reboot and enter the single-user mode.

3. The following display confirms successful entry into single-user mode.

4. Proceed with resetting the password.

To reset the root password, use the passwd command. For other users, reset the password using the format passwd user.

1$ passwd

The display of all authentication tokens updated successfully indicates successful password reset. Enter exit to exit single-user mode and return to normal mode.