To create a new key pair, select the type of key to generate from the bottom of the screen (using SSH-2 RSA with 2048 bit key size is good for most people; another good well-known alternative is ECDSA). Then click Generate, and start moving the mouse within the Window. Putty uses mouse movements to collect randomness.
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An SSH Key allows you to log into your server without needing a password. SSH Keys can be automatically added to servers during the installation process.
Dec 18, 2019 In this tutorial, we will walk through how to generate SSH keys on Ubuntu 18.04 machines. We will also show you how to set up an SSH key-based authentication and connect to your remote Linux servers without entering a password. Nov 16, 2019 Home Linux server How to generate SSH key. Linux server. How to generate SSH key. By The Linux Digest Guy November 16, 2019. Ssh-keygen -t rsa -b 4096. This will make a SSH key with the type RSA and bit length of 4096. This is larger than the default of 2048 bits. A larger key can be more secure. 4096 bits should be sufficient here. Nov 16, 2019 The ssh-keygen tool is included in the openssh-client package. Ssh-keygen -t rsa -b 4096. This will make a SSH key with the type RSA and bit length of 4096. This is larger than the default of 2048 bits. A larger key can be more secure. 4096 bits should be sufficient here. Press enter to save in the default location. If this is not your first.
Creating an SSH key on Windows
The simplest way to create SSH key on Windows is to use PuTTYgen.
- Download and run PuTTYgen.
- Click the 'Generate' button.
- For additional security, you can enter a key passphrase. This will be required to use the SSH key, and will prevent someone with access to your key file from using the key.
- Once the key has been generated, click 'Save Private Key'. Make sure you save this somewhere safe, as it is not possible to recover this file if it gets lost
- Select all of the text in the 'Public key for pasting into OpenSSH
authorized_keysfile'. This is what you would need to enter into the control panel to use the SSH key.
Creating an SSH key on Linux
The tools to create and use SSH are standard, and should be present on most Linux distributions. With the following commands, you can generate ssh key.
- Run:
ssh-keygen -t rsa. For a more secure 4096-bit key, run:ssh-keygen -t rsa -b 4096 - Press enter when asked where you want to save the key (this will use the default location).
- Enter a passphrase for your key.
- Run
cat ~/.ssh/id_rsa.pub- this will give you the key in the proper format to paste into the control panel. - Make sure you backup the
~/.ssh/id_rsafile. This cannot be recovered if it is lost.
Adding an SSH key to your control panel
- Once you're logged in, go to https://my.vultr.com/sshkeys.
- Click 'Add SSH Key'.
- Enter a descriptive name for the key.
- Paste in your SSH public key. This is a long string beginning with 'ssh-rsa'. You should have saved this from when you generated your key.
- Click 'Add SSH Key'.
- Now, when you're deploying servers you will be able to select which SSH keys you want to add to the newly deployed server. Remember to select the keys before the initial server deployment, otherwise you will need to log into the newly created server and add the SSH keys manually.
Limitations
- SSH keys are only available for Linux and FreeBSD. They are not supported for Windows, custom ISOs, nor snapshot restores.
- SSH keys can only be managed from the control panel during deployment. You cannot use the control panel to manage them on an already-installed instance.
Connecting to a server using an SSH key from a Windows client
- Download and run the PuTTY SSH client.
- Type the IP address or Username + IP address (
[email protected]) of the destination server under the 'Host Name' field on the 'Session' category. - Navigate to the 'Connection -> SSH -> Auth' category (left-hand side).
- Click 'Browse..' near 'Private key file for authentication'. Choose the private key file (ending in
.ppk) that you generated earlier with PuTTYgen. - Click 'Open' to initiate the connection.
- When finished, end your session by pressing
Ctrl+d.
Connecting to a server using an SSH key from a Linux client
- Check that your Linux operating system has an SSH client installed (
which ssh). If a client is not installed, you will need to install one. - Initiate a connection:
ssh -i /path/to/id_rsa [email protected] - When finished, end your session by pressing
Ctrl+d.
With a secure shell (SSH) key pair, you can create virtual machines (VMs) in Azure that use SSH keys for authentication, eliminating the need for passwords to sign in. This article shows you how to quickly generate and use an SSH public-private key file pair for Linux VMs. You can complete these steps with the Azure Cloud Shell, a macOS or Linux host, the Windows Subsystem for Linux, and other tools that support OpenSSH.
Note
VMs created using SSH keys are by default configured with passwords disabled, which greatly increases the difficulty of brute-force guessing attacks.
For more background and examples, see Detailed steps to create SSH key pairs.
For additional ways to generate and use SSH keys on a Windows computer, see How to use SSH keys with Windows on Azure.
Supported SSH key formats
Azure currently supports SSH protocol 2 (SSH-2) RSA public-private key pairs with a minimum length of 2048 bits. Other key formats such as ED25519 and ECDSA are not supported.
Create an SSH key pair
Generate Ssh-rsa Key Linux
Use the ssh-keygen command to generate SSH public and private key files. By default, these files are created in the ~/.ssh directory. You can specify a different location, and an optional password (passphrase) to access the private key file. If an SSH key pair with the same name exists in the given location, those files are overwritten.
The following command creates an SSH key pair using RSA encryption and a bit length of 4096:
If you use the Azure CLI to create your VM with the az vm create command, you can optionally generate SSH public and private key files using the --generate-ssh-keys option. The key files are stored in the ~/.ssh directory unless specified otherwise with the --ssh-dest-key-path option. The --generate-ssh-keys option will not overwrite existing key files, instead returning an error. In the following command, replace VMname and RGname with your own values:
Provide an SSH public key when deploying a VM
To create a Linux VM that uses SSH keys for authentication, specify your SSH public key when creating the VM using the Azure portal, Azure CLI, Azure Resource Manager templates, or other methods:
If you're not familiar with the format of an SSH public key, you can display your public key with the following cat command, replacing ~/.ssh/id_rsa.pub with the path and filename of your own public key file if needed:
A typical public key value looks like this example:
If you copy and paste the contents of the public key file to use in the Azure portal or a Resource Manager template, make sure you don't copy any trailing whitespace. To copy a public key in macOS, you can pipe the public key file to pbcopy. Similarly in Linux, you can pipe the public key file to programs such as xclip.
The public key that you place on your Linux VM in Azure is by default stored in ~/.ssh/id_rsa.pub, unless you specified a different location when you created the key pair. To use the Azure CLI 2.0 to create your VM with an existing public key, specify the value and optionally the location of this public key using the az vm create command with the --ssh-key-values option. In the following command, replace VMname, RGname, and keyFile with your own values:
If you want to use multiple SSH keys with your VM, you can enter them in a space-separated list, like this --ssh-key-values sshkey-desktop.pub sshkey-laptop.pub.
SSH into your VM
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With the public key deployed on your Azure VM, and the private key on your local system, SSH into your VM using the IP address or DNS name of your VM. In the following command, replace azureuser and myvm.westus.cloudapp.azure.com with the administrator user name and the fully qualified domain name (or IP address):
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If you specified a passphrase when you created your key pair, enter that passphrase when prompted during the login process. The VM is added to your ~/.ssh/known_hosts file, and you won't be asked to connect again until either the public key on your Azure VM changes or the server name is removed from ~/.ssh/known_hosts.
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If the VM is using the just-in-time access policy, you need to request access before you can connect to the VM. For more information about the just-in-time policy, see Manage virtual machine access using the just in time policy.
Next steps
Generate Ssh Key Linux 4096 Windows 10
Generate Ssh Rsa Key Linux
For more information on working with SSH key pairs, see Detailed steps to create and manage SSH key pairs.
If you have difficulties with SSH connections to Azure VMs, see Troubleshoot SSH connections to an Azure Linux VM.