ArrowLeft Icon

Stay Secure — Essential SSH Security Practices for Linux Servers

📆 · ⏳ 4 min read · · 👀


Setting up SSH on a server is an important task for securing remote access to your systems. However, it is crucial to follow best practices to ensure the security of your systems and data. In this blog, we will discuss some of the essential security practices that you should follow when setting up SSH on your server.

Setting up SSH

Install the SSH Server

To install the SSH server, you can use the package manager for your Linux distribution. For example, on a Debian-based system, you can use the following command:

Terminal window
sudo apt-get update
sudo apt-get install ssh

Start the SSH Service

Once the SSH server is installed, you can start the SSH service using the following command:

Terminal window
sudo systemctl start ssh

Verify SSH is Running:

To verify that the SSH service is running, you can use the following command:

Terminal window
sudo systemctl status ssh

Configure SSH

The SSH server is configured through the /etc/ssh/sshd_config file. You can use a text editor, such as nano or vi, to make changes to this file.

Restart the SSH Service

After making changes to the /etc/ssh/sshd_config file, you will need to restart the SSH service for the changes to take effect. You can use the following command to restart the service:

Terminal window
sudo systemctl restart ssh

That’s it! Now that you have installed and set up SSH on your Linux server, you can start using it for secure remote access.

Follow the next section to learn about security practices outlined to keep your server secure.


The specific steps for installing and configuring SSH may vary slightly depending on your Linux distribution, so be sure to consult the documentation for your distribution if you run into any issues.

Security Practices for SSH

Use a Strong Password

When setting up an SSH server, the first and most important step is to use a strong password for the root user account. This password should be a combination of letters, numbers, and special characters, and should be at least 12 characters long.

Disable Root Login

The root account is the most privileged user on the system and it is recommended to disable direct root login via SSH. Instead, you can create a non-root user account and use that account to log in to the server, and then use the sudo command to run commands as the root user.

To update this, open the ssh config file in a text editor and update this line

Terminal window
PermitRootLogin no

Use Public Key Authentication

Instead of using a password for authentication, you can use public key authentication with SSH. This is more secure as it eliminates the possibility of password-based attacks, such as brute force attacks.

To update this, open the ssh config file in a text editor and update this line

Terminal window
PasswordAuthentication no

Change the Default SSH Port

By default, the SSH server listens on port 22. To add an extra layer of security, you can change the default SSH port to a different port number. This makes it more difficult for attackers to find your SSH server, as they would have to scan a larger range of ports.

To update this, open the ssh config file in a text editor and update this line

Terminal window
Port 2222

Limit SSH Access

You can limit SSH access to specific users or IP addresses by using the ‘AllowUsers’ or ‘AllowGroups’ directive. This allows you to control who can log in to your server via SSH and from where.

To update this, open the ssh config file in a text editor and update this line

Terminal window
AllowUsers user1 user2

Use SSH Hardening Options

SSH includes several hardening options that you can use to further secure your server. For example, you can disable the forwarding of X11 sessions, or restrict the use of certain protocols.

X11 forwarding is an SSH protocol that enables users to run graphical applications on a remote server and interact with them using their local display and I/O devices.

The majority of the time you would never need this if you are using your server for CLI operations.

To update this, open the ssh config file in a text editor and update this line

Terminal window
X11Forwarding no
Protocol 2

Keep SSH Up-to-Date

Finally, it’s important to keep your SSH server up-to-date with the latest security patches and updates. This helps to ensure that your server is protected against any known vulnerabilities.


By following these security practices, you can ensure that your SSH server is secure and protected against potential threats. These practices are not difficult to implement, but they can make a big difference in keeping your server and data safe. Remember to always keep your server updated and to follow best practices for securing your systems.

That’s it for this one, See you in another one 👋🏽

EnvelopeOpen IconStay up to date

Get notified when I publish something new, and unsubscribe at any time.

Need help with your software project? Let’s talk

You may also like

  • # linux# security

    Exploding your system: The deadly Fork Bomb in Linux

    Are you familiar with the term 'fork bomb' in Linux? If not, it is a potentially dangerous command that can severely impact system performance and stability. In this article, we will explore what a fork bomb is, how it works, and how to protect your Linux system from its harmful effects.

  • # linux# security

    Protect Your Linux Server with UFW Firewall: A Step-by-Step Guide

    Ensure the security of your Linux server by setting up a firewall. UFW (Uncomplicated Firewall) is a user-friendly firewall that's easy to set up and configure. In this guide, we'll walk you through the process of installing UFW, creating firewall rules, and managing firewall rules in Linux.

  • # linux

    SystemD Timers vs. Cron Jobs

    Explore the world of task scheduling in Linux as we compare the classic Cron Jobs with the modern SystemD Timers. Learn when to use each method and how to set them up to automate your Linux system tasks effectively.