Secure Shell (SSH) is a cryptographic network protocol that is commonly used to securely execute commands and transfer data from one computer to another over the internet. It is highly essential in managing servers remotely. In this blog post, we will explain how you can SSH into a Linux server.
Step 1: Install SSH Client
SSH client is already installed on most Linux distributions. However, if it’s not available on your system, you can easily install it with a single command line. In Ubuntu, for instance, you can install it by typing:
sudo apt-get install openssh-client
Step 2: Connect to the SSH Server
Before proceeding, ensure you have the following details:
- The IP address or hostname of the Linux server
- The username and password you will use to log into the server
Once you have these details, use the following command to connect to the SSH server:
Replace username with your username and hostname with the actual IP address or hostname of your Linux server.
Step 3: Confirm Connection
For the initial connection, you will be prompted to accept the server’s fingerprint. Type “yes” and press Enter. You will then be prompted to enter your password. Type it in and press Enter. If the details are correct, you should now be logged into your Linux server through SSH.
Step 4: Use SSH Key for Authentication (Optional)
Alternatively, for added security, you can use an SSH key pair for authentication instead of a password. First, you need to generate the SSH key pair on your local machine using this command:
Then, copy the public key to the server with the ssh-copy-id command:
Now, when you use the SSH command to connect to the server, you will be authenticated with the SSH key and will not be asked for the password.
SSH is a powerful and secure method for remotely managing and operating on servers. It is widely used by system administrators for tasks ranging from system updates and configuration changes to more intricate tasks such as automation scripts. Understanding how to SSH into a Linux server is a critical skill for anyone working with Linux servers.