How to Reset User Password in CoreOS

Introduction

Managing user credentials securely and efficiently is crucial, particularly for systems like CoreOS that are designed to support modern infrastructure needs. This blog post will guide you through the process of resetting user passwords in CoreOS, an essential task for maintaining system security and user access control. In this post we will describe the detailed steps needed to handle this task effectively, ensuring your systems remain secure and accessible.

Procedure

Boot into root shell

Press e in Grub to enter edit grub mode

Add init=/bin/sh and console=tty0 to the end of linux line like so:

Pree Ctrl+x to start the server with this configuration.

Reset core user password

You are now presented with a shell:

Now to reset the core user password using the following commands:

/sbin/load_policy -i
passwd core

Now the core user password has changed. In order for it to pass selinux restrictions, we need to run the following

/sbin/restorecon -v /etc/{passwd,shadow}

Now you can reboot and login as core user with your new password.

Summary

In this post we have seen How to Reset User Password in CoreOS. Resetting a user passwords in CoreOS is just one of the many IT services we do at Octopus. We understand the challenges businesses face in managing complex IT environments, and provide not only the know-how but also the necessary tools and support. Our expertise in cloud solutions and open source consulting, particularly with platforms like Red Hat OpenShift and OpenStack, enables us to assist companies in maintaining robust, secure, and efficient IT systems.

Enjoy.