What should I do if I forget my centos7 password?

Three solutions for CentOS 7 forgotten password: Single-user mode: Restart the system, edit the kernel options, change ro to rw init=/sysroot/bin/sh, and use the passwd command to reset the root password. Rescue mode: Boot from the installation media, select rescue mode, mount the root file system, chroot to the root file system, and use the passwd command to reset the root password. Grub2 command line: Restart the system, press c to enter the command line, load the kernel, mount the root file system, chroot to the root file system, and use the passwd command to reset the root password.

CentOS 7 Forgot Password Solutions

Forgetting your password is frustrating, but for CentOS 7 users, there are several There are several ways to retrieve your password.

Method 1: Reset password via single-user mode

Steps:

1. Restart the system.
2. When the GRUB menu appears, press e to edit the kernel boot options.
3. Find the line starting with linux16 and change ro to rw init=/sysroot/bin/sh.
4. Press F10 to start the system.
5. The system will enter single-user mode and the prompt is #.
6. Enter the following command to reset the root password: passwd.
7. Enter the new password as prompted and press Enter.
8. Enter exit to restart the system.

Method 2: Reset Password Using Rescue Mode

Steps:

1. From CentOS 7 Installation Media or Live CD/ USB boot.
2. Select the "Troubleshooting" option.
3. Select "Rescue Mode".
4. The system will load the rescue environment.
5. Follow the prompts to mount the root file system, for example: mount /dev/sda1 /mnt (Adjust according to the actual root partition).
6. Switch to the root file system: chroot /mnt.
7. Reset the root password using the same passwd command as in method 1.
8. Enter exit to exit the chroot environment.
9. Unmount the root file system: umount /mnt.
10. Restart the system.

Method 3: Use the Grub2 command line to reset the password

Steps:

1. Restart the system.
2. When the GRUB menu appears, press c to enter the command line.
3. Enter the following command to load the kernel: linux16 /vmlinuz initrd16 initrd.img.
4. Enter the following command to mount the root file system: mount /dev/sda1 /mnt (Adjust according to the actual root partition).
5. Switch to the root file system: chroot /mnt.
6. Reset the root password using the same passwd command as in method 1.
7. Enter exit to exit the chroot environment.
8. Enter reboot to restart the system.

The above methods can help you retrieve your CentOS 7 password if you forget it. If you encounter any problems, please consult a professional system administrator or refer to the official CentOS documentation.

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