How to Setup SSH Keys for Passwordless Login on Linux

To set up a passwordless SSH login in Linux all you need to do is to generate a public authentication key and append it to the remote hosts ~/. ssh/authorized_keys file.
...
Setup SSH Passwordless Login

1. Check for existing SSH key pair. ...
2. Generate a new SSH key pair. ...
3. Copy the public key. ...
4. Login to your server using SSH keys.

1. How do I enable Passwordless authentication using SSH?
2. How do I generate a SSH key for a different user?
3. How do I generate an SSH key in Linux?
4. How do I generate my SSH key RSA 2048?
5. How do I login using SSH key?
6. How does SSH key authentication work?
7. What is username for SSH key?
8. How do I create a user public key?
9. How do I generate an SSH key in Windows?
10. Where is my public SSH key?
11. Where is my SSH private key Linux?
12. How do I find my public key Linux?

How do I enable Passwordless authentication using SSH?

How to Set Up Passwordless SSH Login

1. Before You Start: Check for Existing SSH Keys.
2. Step 1: Generate SSH Key Pair.
3. Step 2: Upload Public Key to Remote Server. Option 1: Upload Public Key Using the ssh-copy-id Command. ...
4. Step 3: Log in to Server Without Password.
5. Optional: Troubleshooting Remote Server File Permissions.

How do I generate a SSH key for a different user?

Answer

1. Login as the user for which the SSH key is to be generated.
2. To generate an RSA ssh key, issue the command: ssh-keygen -t rsa.
3. Respond to prompts from the ssh-keygen command, which generates an SSH key in $HOME/.ssh (unless the user specified a different directory)

How do I generate an SSH key in Linux?

Creating the Key Pair on OSX and Linux

1. Open the terminal application (command line) by clicking on the corresponding icon:
2. Type the following command ssh-keygen -o -b 4096 and press Enter to generate the new key: ...
3. Enter the file path in which to safe the key. ...
4. ...
5. ...

How do I generate my SSH key RSA 2048?

Using ssh-keygen (Mac/Linux)

1. Open a Terminal/Shell Window.
2. Enter the following command: ssh-keygen -t rsa -b 2048.
3. Enter a location to save the Public and Private Keys. The default path is the '. ...
4. Open the '.ssh' folder in your Home Directory, there will be two files.
5. The file ending in .pub is your Public Key.

How do I login using SSH key?

Using ssh-copy-id

1. To use ssh-copy-id , pass your username and the IP address of the server you would like to access: ssh-copy-id [email protected].
2. You'll see output like the following, and a prompt to enter your user's password: ...
3. Verify that you can log in to the server with your key.

How does SSH key authentication work?

The most common means of authentication is via SSH asymmetric key pairs. The server uses the public key to encrypt a message and send it to the client. If the client has the correct private key, they can decrypt the message and send it back to the server for verification.

What is username for SSH key?

ssh/authorized_keys on any destination server. The other file, just called anything is the private key and therefore should be stored safely for the user. The default location would be ~username/. ssh/id_rsa (here named id_rsa , which is default for rsa keys).

How do I create a user public key?

3. Generate a new key

1. Open a terminal on your local computer and enter the following: ...
2. Just press <Enter> to accept the default location and file name. ...
3. Enter, and re-enter, a passphrase when prompted. ...
4. You're done and you can now go to either SSH user keys for personal use or SSH access keys for system use.

How do I generate an SSH key in Windows?

Generating an SSH key

1. Open the PuTTYgen program.
2. For Type of key to generate, select SSH-2 RSA.
3. Click the Generate button.
4. Move your mouse in the area below the progress bar. ...
5. Type a passphrase in the Key passphrase field. ...
6. Click the Save private key button to save the private key.

Where is my public SSH key?

Your public key has been saved in /Users/yourname/. ssh/id_rsa. pub. You'll also be shown a fingerprint and "visual fingerprint" of your key.

Where is my SSH private key Linux?

By default, the private key is stored in ~/. ssh/id_rsa and the public key is stored in ~/. ssh/id_rsa.

How do I find my public key Linux?

Checking for existing SSH keys

1. Open .
2. Enter ls -al ~/.ssh to see if existing SSH keys are present: $ ls -al ~/.ssh # Lists the files in your .ssh directory, if they exist.
3. Check the directory listing to see if you already have a public SSH key. By default, the filenames of the public keys are one of the following: id_rsa.pub. id_ecdsa.pub.