Secure Shell (SSH) is a cryptographic network protocol that allows secure communication between two computers. It is commonly used for remote access to a computer or server. In this guide, we will show you how to install SSH on Ubuntu.
Before we begin, ensure that you have the following:
- A computer running Ubuntu operating system
- A user account with sudo privileges
Step 1: Update the System
The first step is to update the system to ensure that all the packages are up to date. Open the terminal and type the following command:
sudo apt update
Step 2: Install SSH
To install SSH, run the following command in the terminal:
sudo apt install openssh-server
This command will install the SSH server on your Ubuntu system.
Step 3: Check the Status of SSH Service
After installing SSH, check the status of the SSH service with the following command:
sudo systemctl status ssh
If the SSH service is running, you will see the following output:
● ssh.service - OpenBSD Secure Shell server Loaded: loaded (/lib/systemd/system/ssh.service; enabled; vendor preset: enabled) Active: active (running) since Mon 2021-08-02 15:26:48 UTC; 2min 45s ago Docs: man:sshd(8) man:sshd_config(5) Process: 1668 ExecStartPre=/usr/sbin/sshd -t (code=exited, status=0/SUCCESS) Main PID: 1669 (sshd) Tasks: 1 (limit: 2361) Memory: 3.9M CGroup: /system.slice/ssh.service └─1669 /usr/sbin/sshd -D
If the SSH service is not running, you can start it by running the following command:
sudo systemctl start ssh
Step 4: Configure SSH
By default, SSH is configured to allow password authentication. However, it is recommended to use key-based authentication for security reasons. To configure SSH to use key-based authentication, follow these steps:
- Create a new SSH key pair on your local machine by running the following command:
- Copy the public key to the remote server by running the following command:
userwith the username of the remote server and
server_ipwith the IP address of the remote server.
- Test the SSH connection by running the following command:
If the connection is successful, you will be logged in to the remote server.
In this guide, we have shown you how to install and configure SSH on Ubuntu. SSH is a powerful tool that allows you to securely access a remote server. By following the steps in this guide, you can set up SSH on your Ubuntu system and use it to connect to remote servers.