Password Less Login To a Server & Managing multiple servers - Linux, Windows & Mac etc... #ssh #sshserver #openssh #opensshserver #password #servers #putty #linux #windows

 https://www.codewithharry.com/blogpost/transferring-files-passwordless-login-ubuntu-20-04/

https://www.youtube.com/watch?v=pMJ0_pj5IJI&list=PLu0W_9lII9aiBNXUisDdSmfNbsKq407XC&index=8 - CodeWithHarry

# Passwordless login & Managing multiple servers

To connect to your server without a password from your Windows PC, you can use SSH key-based authentication. Here's a step-by-step guide to set it up:

### Step 1: Install an SSH Client (if not already installed)

- **Windows 10/11** comes with a built-in SSH client, so you don't need to install anything. 

- If you're using an older version of Windows or prefer a GUI tool, you can use **PuTTY** or **MobaXterm**.

### Step 2: Generate an SSH Key Pair (on your Windows PC)

You need to create an SSH key pair (a public and a private key) on your Windows PC:

1. **Using the Command Prompt (Built-in SSH client)**

   - Open the **Command Prompt** or **PowerShell**.

   - Run the following command to generate the SSH key:

     ```bash

     ssh-keygen

     ```

   - Press **Enter** to accept the default location (C:\Users\<YourUserName>\.ssh\id_rsa).

   - You can set a passphrase, but leave it empty if you want passwordless access.

2. **Using PuTTY (If you prefer)**

   - Download and install **PuTTY** and **PuTTYgen** from the official website.

   - Open **PuTTYgen** and click "Generate" to create a key pair.

   - Save the private key (.ppk file) and copy the public key.

### Step 3: Copy the Public Key to the Server

Now, you'll need to copy the public key from your Windows PC to your server:

1. **Using PowerShell/Command Prompt (for built-in SSH client)**

   - Use the `ssh-copy-id` command to copy the public key to your server:

     ```bash

     ssh-copy-id username@your_server_ip

     ```

   - If `ssh-copy-id` is not available, manually copy the key:

     - On your Windows PC, open the `.ssh/id_rsa.pub` file and copy its contents.

     - On your server, log in with your password and append the public key to the `.ssh/authorized_keys` file:

       ```bash

       echo "your_public_key" >> ~/.ssh/authorized_keys

       chmod 600 ~/.ssh/authorized_keys

       chmod 700 ~/.ssh

       ```

2. **Using PuTTY**

   - In PuTTY, open an SSH session to your server using your username and password.

   - On the server, create or open the `~/.ssh/authorized_keys` file.

   - Paste your public key into this file and save.

### Step 4: Test the SSH Connection

- Now, try connecting to your server using SSH without a password:

   ```bash

   ssh username@your_server_ip

   ```

- If you're using PuTTY, load the private key in PuTTY's SSH settings under "Auth."

If everything is set up correctly, you should be able to log in without being prompted for a password!