Chapter 15: Understanding /etc/ssh/sshd_config
In Chapter 15, you will learn what the sshd_config file is, how it is structured, how to edit it safely with a backup, how to test for syntax errors before applying changes, and how to reload the SSH service without dropping active sessions.
In the previous two chapters, you learned how to configure the SSH client using ~/.ssh/config file, where you learned how to set up aliases, shortcuts, and per-host defaults that make connecting to servers faster and cleaner.
In this chapter, you will switch sides, instead of configuring the client, you will configure the server, specifically the main SSH server configuration file at /etc/ssh/sshd_config.
This file controls how your SSH server behaves when clients connect to it, and understanding it is essential for anyone managing Linux servers.
Ravi Saive