Users & Security

Users and groups, sudo and privilege escalation, SSH key authentication, and baseline hardening steps.

Covers the account and access-control model, and the small set of hardening steps that matter most on a freshly provisioned machine.

  • Hardening Basics

    A short, high-value checklist for securing a freshly provisioned Linux machine before exposing it to the internet - not exhaustive, but covers the changes that matter most for the least effort.

  • SSH Keys and Authentication

    Public-key authentication lets you log into a remote machine by proving you hold a private key, rather than typing a password - how the key pair works, and how to set it up.

  • Sudo and Privilege

    sudo lets an authorized user run specific commands as another user, usually root, without sharing the root password - /etc/sudoers controls exactly who's allowed to do what.

  • Users and Groups

    The account and group model behind Linux's ownership and permission system - who a user is, how groups grant shared access, and the commands for managing both.