setup ssh for secure remote access

Linux Basics: Setting Up SSH for Secure Remote Access


SSH (Secure Shell) is a cryptographic network protocol used for securely accessing a remote system. Whether you are a system administrator or a developer, knowing how to configure and use SSH is a vital skill.


This article will guide you through the process of installing and configuring SSH for secure remote access. We’ll cover key concepts, authentication methods, and common configurations.

Installing SSH

Most Linux distributions come with SSH installed, but if it’s not, you can easily install it.

For Debian-based systems (Ubuntu, Debian):

sudo apt-get update sudo apt-get install openssh-server

For Red Hat-based systems (CentOS, Almalinux, Rocky linux, Fedora):

sudo yum install openssh-server

Configuring SSH

Basic Configuration

Open the main configuration file with a text editor:

sudo nano /etc/ssh/sshd_config

Make necessary adjustments, such as changing the default SSH port or disabling root login:

Port 2222 PermitRootLogin no

Restart the SSH service to apply changes:

sudo systemctl restart sshd

Key-Based Authentication

Generate a key pair:


Copy the public key to the remote server:

ssh-copy-id username@remote_host

For more advanced SSH key configurations, you can refer to our detailed guide on SSH key security.

Using SSH

Connect to a remote server:

ssh username@remote_host

Specify a custom port:

ssh -p 2222 username@remote_host

Security Tips

  • Change the default SSH port to reduce exposure to automated attacks.
  • Use key-based authentication instead of password authentication.
  • Regularly update the SSH package to patch vulnerabilities.


Setting up SSH for secure remote access is an essential task for anyone working with Linux servers. By following these instructions, you can ensure that your remote connections are secure and efficient.

Explore more Linux Basics in our comprehensive series.



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