How to setup Server with Ubuntu 22.04?

How to setup Server with Ubuntu 22.04?

Streamlining Server Setup: A Technical Guide to Ubuntu 22.04 Configuration

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Hey nerds,

In this article, we will walk through the process of setting up an Ubuntu 22.04 server. As a computer science student, it's important to understand the technical aspects while keeping the instructions straightforward. Let's dive in!

Step 1: Logging into the Server

For Linux Users:

Open a terminal and use the following command to log in to your server:

ssh -i ssh_key abhishek@<server_ip_address>

For Windows Users:

  1. Download and install Putty on your Windows PC.


  2. Launch Putty and enter the following details:

    • Hostname: <username>@<server_ip_address>

    • Navigate to SSH > Auth and click "Browse" to select the SSH Private Key.

  3. Click "Open" to establish the SSH connection.

Congratulations! You have successfully logged into your server.

Step 2: Creating a New User

To create a new user, follow these steps:

  1. Run the command:

     sudo adduser <username>

    Replace <username> with the desired username for the new user.

  2. Grant administrative privileges to the new user:

     usermod -aG sudo <username>

Great! You have created a new user with administrative privileges.

Step 3: Setting Up the Firewall

Now, let's set up a firewall to enhance server security:

  1. Check the available application profiles:

     ufw app list
  2. Allow OpenSSH, HTTP, and HTTPS traffic:

     ufw allow OpenSSH
     ufw allow http
     ufw allow https
  3. Enable the firewall:

     ufw enable
  4. Verify the firewall status:

     ufw status

    If the output matches the following, your firewall is correctly configured:

     Status: active
     To                         Action      From
     --                         ------      ----
     OpenSSH                    ALLOW       Anywhere                  
     80/tcp                     ALLOW       Anywhere                  
     443                        ALLOW       Anywhere                  
     OpenSSH (v6)               ALLOW       Anywhere (v6)             
     80/tcp (v6)                ALLOW       Anywhere (v6)             
     443 (v6)                   ALLOW       Anywhere (v6)

Step 4: Setting Up SSH Key in Ubuntu Server

To set up SSH key-based authentication, follow these steps:

Create a new SSH key pair using ssh-keygen:

  1.     ssh-keygen

    This generates two files: the public key (.pub extension) and the private key (no extension).

  2. Switch to the new user:

     su - <username>
  3. Create the necessary directory structure for SSH:

     mkdir ~/.ssh
     chmod 700 ~/.ssh
     touch ~/.ssh/authorized_keys
     chmod 600 ~/.ssh/authorized_keys
  4. Open the authorized_keys file:

     nano ~/.ssh/authorized_keys
  5. Copy and paste the content of the .pub file into the authorized_keys file and save it (CTRL+S).

  6. Log in to your server using SSH with the private key:

     ssh -i <privatekeyfile> <username>@<server_ip_address>

Fantastic! You have successfully set up SSH key-based authentication.

Conclusion: By following this technical yet straightforward guide, you have now set up an Ubuntu 22.04 server, created a new user with administrative privileges, configured a firewall, and enabled SSH key-based authentication.

Happy exploring and learning on your new server!

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