Why Use VNC?

VNC enables remote desktop sharing over a network, which is especially useful for managing remote servers or desktops without needing direct physical access. It's widely used for troubleshooting, administering systems remotely, and for accessing applications that require a graphical interface.

Installing VNC Server on Ubuntu

Follow these steps to install and configure the VNC server on your Ubuntu system:

1. Update your system packages:
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2. Install the VNC server (TigerVNC):
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3. Create a password for VNC:

   Set a password for the VNC session so that only authorized users can access the remote desktop. Run the following command and enter your desired password:

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4. Create a new systemd service for VNC:

   To ensure that VNC runs automatically after a reboot, create a systemd service by creating a new service file in the following location:

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   Enter the following content in the service file (replacing 'your-user' with your username):

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5. Start and enable the VNC service:
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Installing VNC Client on Ubuntu

To connect to the VNC server from your local machine, you need to install a VNC client. You can use TigerVNC Viewer or RealVNC:

1. Install the VNC client (TigerVNC Viewer):
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2. Connect to the VNC server:

   Run the following command to connect to the VNC server (replace 1 with the port number and your-server-ip with the server's IP address):

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Installing VNC on CentOS

To install VNC on CentOS, follow the steps below:

1. Update your system packages:
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2. Install the VNC server:
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3. Configure the VNC server:

   Edit the configuration file for VNC by creating a custom configuration for your user:

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4. Start the VNC server:
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Conclusion

VNC is an excellent solution for remote desktop access, and by following this guide, you should now have it installed and configured on both Ubuntu and CentOS systems. You can now connect to your server's desktop interface using a VNC client and manage your system remotely.

Why Change Your SSH Port Number?

The default SSH port number (22) is a well-known target for attackers. It's the first port that malicious actors will try when attempting to gain unauthorized access to your server. By changing the port number to something more obscure, you make it more difficult for attackers to find and exploit your SSH service.

Changing the SSH port adds an extra layer of security by preventing automated scripts and brute-force attempts that typically target port 22. It’s a simple change, but it can greatly enhance the overall security of your server.

Step-by-Step Guide: Changing Your SSH Port

Follow these steps to change your SSH port number and increase your server's security:

1. Log in to your server as root or a user with sudo privileges
2. Open the SSH configuration file for editing:
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3. Find the line that specifies the default SSH port. It will look like this:
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   Remove the "#" symbol to uncomment the line, and then change the port number to your desired value (for example, 2222, 2200, etc.):
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4. Save the changes and close the file: Press CTRL + X, then Y to confirm changes, and hit Enter to save the file.
5. Adjust your firewall rules to allow the new port: If you're using UFW, run the following command to allow traffic on your new port (replace 2222 with your port number):
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   Don't forget to remove the old rule for port 22:
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6. Restart the SSH service to apply the changes:
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7. Test the new SSH port by opening a new terminal window and trying to connect to the server with the new port:
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   Make sure you can log in successfully before closing your current SSH session.

Remember: Never Lock Yourself Out!

Before closing your SSH session, always make sure you can log in using the new port. Test the new connection in a separate terminal window to confirm that the change was successful and that you're not locking yourself out of the server.

Can I Change My Port Back Later?

Yes, you can always change your SSH port number back to 22 if necessary. Just follow the same steps, but revert the port number to 22. Remember to adjust your firewall rules and restart SSH after making the changes.

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How Does the Migration Process Work?

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What’s the Catch?

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