What to do if you forget your username in centos

How to Retrieve Forgotten CentOS Username

It can be frustrating to forget your CentOS server username, but you can retrieve it using the following steps:

1. Using a local user

• If you have physical access to the server, restart it and enter single-user mode. This can be performed by pressing the "e" key during boot and adding "1" to the boot options.
• Then press the "Enter" key to enter the command line interface.
• Change the root user's password using the following command:

passwd

• Set a new password and then restart the server.

2. Use rescue mode

• If you do not have physical access to the server, you can use rescue mode to retrieve the username.
• Execute after pressing the "e" key during the boot process and adding "rescue" to the boot options.
• Press the "Enter" key to enter the command line interface.
• Run the following command:

chroot /mnt/sysimage
passwd

• Set a new password and restart the server.

3. Using IPMI or KVM

• If your server supports IPMI or KVM, you can use them to access the console remotely.
• When you log in, you will be able to see your username.
• Using this information, you can reset your password through one of the methods above.

Tip:

• After changing your password, be sure to write it down immediately for future reference.
• Consider using a password manager to store your passwords securely.
• Update your password regularly to ensure system security.

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