1. The Detailed Steps For Generating An Ssh Key In Windows 7
  2. The Detailed Steps For Generating An Ssh Key Mac
  3. How To Generate Ssh Key Pair
  4. The Detailed Steps For Generating An Ssh Key In Computer
  5. The Detailed Steps For Generating An Ssh Keyboard

I am referring to the following tutorial and following the below steps. SSH Setup and Key Generation. SSH setup is required to do different operations on a cluster such as. Apr 09, 2020  Book Title. Cisco Nexus 9000 Series NX-OS Security Configuration Guide, Release 6.x. Chapter Title. Configuring SSH and Telnet. PDF - Complete Book (4.41 MB) PDF - This Chapter (1.23 MB) View with Adobe Reader on a variety of devices. Detailed Steps on how to create ssh keys in Lunix. This contains details steps on how to create your ssh key pairs and load them onto your servers. Setting up SSH Keys (public and private key) Just a quick summary on how to use the ssh-agent so we can use ssh keys which are password protected. CLIENT “Main client your connecting from, holds.

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SSH keys are one of the most secure SSH authentication options. It is definitely more secure than the usual SSH password authentication. Therefore, it is highly recommended to use SSH Key authentication method for connections to your servers.

With password authentication, you can connect to your server from any location, you only need to fill in your password. However, if your password gets leaked, it is a major risk as anyone who knows your password will be able to get into the server.

SSH Key authentication only allows connections from clients whose key matches the one on the server. Basically, you generate a key pair (private key and public key). The private key is placed on your local machine and the public key is uploaded to the server. When connecting to the server, a validation of these two keys is made and if the key pair passes the validation you are allowed to connect. Of course, you can upload keys of multiple users so that you or other authorized users would be able to connect to the server from different computers.

As you can see this is a much safer connection method. In this tutorial, we will focus on Windows users who use PuTTY for connections to the server and show how to generate PuTTYSSH Keys. If you want to generate SSH Keys on Linux or Mac, see this tutorial.

What you’ll need

Before you begin this guide you’ll need the following:

  • Access to your Linux server / VPS
  • PuTTY and PuTTYgen installed on your computer (Download here)

Step 1 — Downloading PuTTYgen

Most of you have PuTTY installed on your computers already, however, to generate SSH Keys you also will need PuTTYgen.

  1. Download PuTTYgenhere
  2. You should be able to see this file downloaded:

No installation is required for PuTTYgen, it will run when you execute the file.

Step 2 — Generating your SSH Key pair

  1. Open up PuTTYgen by double clicking on the puttygen.exe file you have downloaded in Step 1.
  2. You should be able to see a window like this:
  3. Before generating your SSH Key pair, you can edit some settings, for example, key length, however, in most cases the default options will work just fine.
  4. Generate your SSH Key pair by clicking the Generate button.
  5. When the progress bar starts loading, move your mouse randomly across the area to load up the bar and generate your key pair.
  6. Your public SSH key will be displayed on the screen:
  7. For additional security it is highly recommended to think of a passphrase for your SSH key (However, you can also leave it empty):
  8. Save your private key to any desired location on your computer and name it anything you like.
  9. Save your public key to the same location on your computer and name it anything you like.

And that is it, you have generated your SSH Key pair. The private key will stay on your computer (do not provide it to anyone) while your public key needs to be uploaded to the server you wish to connect to.

Step 3 — Setting up your private key on PuTTY

In order for the server to recognize your computer when connecting from PuTTY, you need to attach the private key to PuTTY.

  1. Open up PuTTY.
  2. Navigate to Connection -> SSH -> Auth in the left sidebar.
  3. Browse for your private key file in the field Private key for authentication
  4. Select the private key file with .ppk ending and click Open.

Step 4 – Adding public key to server

Lastly, you need to upload your public key to the server:

  1. On your local computer, open public key file (id_rsa.pub) you generated in Step 2 with any text editor and copy its contents (public key).
  2. Connect to your VPS using Putty. See this guide for detailed steps.
  3. If .ssh folder does not exist, create it together with authorized_keys file with the following command:
    mkdir ~/.ssh touch ~/.ssh/authorized_keys
  4. Secure SSH Key file by changing permissions:
    chmod 0700 ~/.ssh; chmod 0644 ~/.ssh/authorized_keys
  5. Open authorized_keys file with vim text editor:
    vim ~/.ssh/authorized_keys
  6. Press i key on your keyboard and right mouse button to paste the public key.
  7. Press Esc button and type in :x, hit Enter button. This command will save changes made to the file.

That is it, you can now use SSH keys instead of SSH password authentication to connect to your VPS.

Conclusion

You have learned how to generate PuTTY SSH Keys using PuTTYgen. This will make your connection to the server a lot more secure and convenient as you will not need to fill in the password each time. We recommend using this way of SSH authentication at all times and disable password authentication for good to completely secure your server. To find out how to completely disable SSH Password authentication on your server and use SSH Key authentication instead, follow this tutorial: How to disable SSH Password authentication on VPS.

SSH agent forwarding can be used to make deploying to a server simple. It allows you to use your local SSH keys instead of leaving keys (without passphrases!) sitting on your server.

If you've already set up an SSH key to interact with GitHub, you're probably familiar with ssh-agent. It's a program that runs in the background and keeps your key loaded into memory, so that you don't need to enter your passphrase every time you need to use the key. The nifty thing is, you can choose to let servers access your local ssh-agent as if they were already running on the server. This is sort of like asking a friend to enter their password so that you can use their computer.

Check out Steve Friedl's Tech Tips guide for a more detailed explanation of SSH agent forwarding.

Setting up SSH agent forwarding

Ensure that your own SSH key is set up and working. You can use our guide on generating SSH keys if you've not done this yet.

You can test that your local key works by entering ssh -T git@github.com in the terminal:

We're off to a great start. Let's set up SSH to allow agent forwarding to your server.

The Detailed Steps For Generating An Ssh Key In Windows 7

  1. Using your favorite text editor, open up the file at ~/.ssh/config. If this file doesn't exist, you can create it by entering touch ~/.ssh/config in the terminal.

  2. Enter the following text into the file, replacing example.com with your server's domain name or IP:

Warning: You may be tempted to use a wildcard like Host * to just apply this setting to all SSH connections. That's not really a good idea, as you'd be sharing your local SSH keys with every server you SSH into. They won't have direct access to the keys, but they will be able to use them as you while the connection is established. You should only add servers you trust and that you intend to use with agent forwarding.

Testing SSH agent forwarding

To test that agent forwarding is working with your server, you can SSH into your server and run ssh -T git@github.com once more. If all is well, you'll get back the same prompt as you did locally.

If you're unsure if your local key is being used, you can also inspect the SSH_AUTH_SOCK variable on your server:

If the variable is not set, it means that agent forwarding is not working:

Troubleshooting SSH agent forwarding

Generating ssh keys on windows

Here are some things to look out for when troubleshooting SSH agent forwarding.

You must be using an SSH URL to check out code

SSH forwarding only works with SSH URLs, not HTTP(s) URLs. Check the .git/config file on your server and ensure the URL is an SSH-style URL like below:

Your SSH keys must work locally

Before you can make your keys work through agent forwarding, they must work locally first. Our guide on generating SSH keys can help you set up your SSH keys locally.

Your system must allow SSH agent forwarding

Sometimes, system configurations disallow SSH agent forwarding. You can check if a system configuration file is being used by entering the following command in the terminal:

The Detailed Steps For Generating An Ssh Key Mac

In the example above, the file ~/.ssh/config is loaded first, then /etc/ssh_config is read. We can inspect that file to see if it's overriding our options by running the following commands:

In this example, our /etc/ssh_config file specifically says ForwardAgent no, which is a way to block agent forwarding. Deleting this line from the file should get agent forwarding working once more.

Your server must allow SSH agent forwarding on inbound connections

Agent forwarding may also be blocked on your server. You can check that agent forwarding is permitted by SSHing into the server and running sshd_config. The output from this command should indicate that AllowAgentForwarding is set.

Your local ssh-agent must be running

On most computers, the operating system automatically launches ssh-agent for you. On Windows, however, you need to do this manually. We have a guide on how to start ssh-agent whenever you open Git Bash.

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How To Generate Ssh Key Pair

To verify that ssh-agent is running on your computer, type the following command in the terminal:

The Detailed Steps For Generating An Ssh Key In Computer

Your key must be available to ssh-agent

You can check that your key is visible to ssh-agent by running the following command:

If the command says that no identity is available, you'll need to add your key:

The Detailed Steps For Generating An Ssh Keyboard

On Mac OS X, ssh-agent will 'forget' this key, once it gets restarted during reboots. But you can import your SSH keys into Keychain using this command: