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SSH commands on Linux: A Secure and Comprehensive Guide

SSH Setup: A Comprehensive Guide

Aim :

Set up SSH for secure and convenient remote access to your Linux server.

SSH Setup: A Step-by-Step Guide

Secure Shell (SSH) is a cryptographic network protocol used for secure data communication, remote command-line login, remote command execution, and more. Follow these steps to set up SSH on your Linux server.

Guidance on How to Use:

Prerequisite:

Ensure that your Linux server is up and running.

  1. Install OpenSSH Server on your Linux server: 
    sudo apt install openssh-server
  2. Enable the SSH service: 
    sudo systemctl enable ssh
  3. Start the SSH service: 
    sudo systemctl start ssh
  4. Verify the status of the SSH service: 
    sudo systemctl status ssh
  5. Change SSH port (optional): 
    sudo nano /etc/ssh/sshd_config
    Find the line Port 22 and change the port number to your desired value. Save and exit, then restart the SSH service: 
    sudo systemctl restart ssh
  6. Create SSH key pair (if not already created): 
    ssh-keygen -t rsa -b 4096
    Follow the prompts to generate your SSH key pair. The public key will be stored in ~/.ssh/id_rsa.pub.
  7. Copy SSH public key to the remote server: 
    ssh-copy-id [YourUsername]@[YourServer]
    Enter your password when prompted.
  8. Disable password authentication (optional, after confirming key-based authentication works): 
    sudo nano /etc/ssh/sshd_config
    Set PasswordAuthentication no, then save and restart the SSH service.
  9. Securely copy files between local and remote machines using SCP: 
    scp [file] [YourUsername]@[YourServer]:[destination]

Verification:

Connect to your server using SSH: 

ssh [YourUsername]@[YourServer]

Written by: A.M.Rinas

Contact: mohomadrinas00@gmail.com

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