Secure Shell (SSH) ubuntu server

admin | June 7, 2023

Secure Shell (SSH) is a cryptographic network protocol used for secure communication over an unsecured network, such as the internet. It is commonly used to provide secure remote access to servers and other devices.

To use SSH on an Ubuntu server, you will need to follow these steps:

1. Install OpenSSH server: OpenSSH is a popular implementation of SSH that comes pre-installed on many Linux distributions, including Ubuntu. If it's not already installed on your server, you can install it with the following command:

sudo apt-get install openssh-server

2. Configure firewall: If you have a firewall running on your server, you will need to allow SSH traffic through it. On Ubuntu, the default firewall is UFW (Uncomplicated Firewall). You can allow SSH traffic by running the following command:

 sudo ufw allow ssh

3. Connect to the server: To connect to your Ubuntu server using SSH, you will need an SSH client on your local machine. If you're using a Mac or Linux machine, you can open the Terminal and use the following command:

 ssh username@server_ip_address

Replace "username" with your username on the server, and "server_ip_address" with the IP address of your server.

If you're using a Windows machine, you can use an SSH client such as PuTTY.

4. Authenticate: When you connect to your server for the first time, you will be prompted to authenticate. You will need to enter the password for the user account you're logging in as.

For added security, you can also use public key authentication. This involves generating a public/private key pair on your local machine and adding the public key to your server's authorized_keys file. This allows you to authenticate without entering a password.

To generate a key pair on your local machine, use the following command:

 ssh-keygen

Follow the prompts to generate the key pair. Once you have generated the keys, you can copy the public key to your server's authorized_keys file with the following command:

 ssh-copy-id username@server_ip_address

Replace "username" with your username on the server, and "server_ip_address" with the IP address of your server.

That's it! You should now be able to securely connect to your Ubuntu server using SSH.

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