How to install and configure OpenSSH on Ubuntu 20.04?

OpenSSH is an open-source tool that allows you to securely connect to a remote server. It encrypts all traffic between the client and the server, making it virtually impossible for anyone to eavesdrop on your communications. In this post, we will show you how to install and configure OpenSSH on Ubuntu 20.04.

Step 1: Update and Upgrade the System

Before installing OpenSSH, it's always a good idea to update and upgrade your Ubuntu system. To do this, run the following commands

sudo apt update

sudo apt upgrade

Step 2: Install OpenSSH

Next, install OpenSSH on your Ubuntu 20.04 system. To do this, run the following command

sudo apt install openssh-server

This will install the OpenSSH server on your Ubuntu system.

Step 3: Configure OpenSSH

After installing OpenSSH, you need to configure it to ensure that it's secure and works as expected. The configuration file for OpenSSH is located at /etc/ssh/sshd_config. You can edit this file using your favorite text editor.

For example, to allow root login via SSH, add the following line to the configuration file

PermitRootLogin yes

You can also restrict SSH access to specific IP addresses by adding the following lines

AllowUsers username@192.168.1.2

DenyUsers username@*

These lines will allow the user "username" to access the SSH server only from the IP address 192.168.1.2.

Step 4: Restart the OpenSSH Service

After making changes to the OpenSSH configuration file, you need to restart the service for the changes to take effect. To do this, run the following command

sudo systemctl restart sshd

This will restart the OpenSSH service on your Ubuntu system.

Step 5: Test the OpenSSH Connection

Finally, you can test the OpenSSH connection by connecting to the SSH server from another computer. To do this, run the following command:

ssh username@your_server_ip

Replace "username" with the actual username on your Ubuntu system, and "your_server_ip" with the IP address of your Ubuntu system.

If everything is configured correctly, you should be able to connect to the SSH server and log in to your Ubuntu system.

Conclusion

In this post, we have shown you how to install and configure OpenSSH on Ubuntu 20.04. OpenSSH is an essential tool for remote server management, and by following the steps outlined in this post, you can ensure that it's installed and configured correctly on your Ubuntu system.


How to install and configure OpenSSH on Ubuntu 18.04?

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