Generate Ssh Host Key Files

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Jun 04, 2019  Obtaining host key from PuTTY If you already have the host key cached in the PuTTY SSH client, you can import a PuTTY stored session to WinSCP, including the cached host keys. Make sure the Import cached host keys for checked sites option is checked when importing the sessions. All Mac and Linux systems include a command called ssh-keygen that will generate a new key pair. If you're using Windows, you can generate the keys on your server. Just remember to copy your keys to your laptop and delete your private key from the server after you've generated it. To generate an SSH key pair, run the command ssh-keygen.

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.

Generating Keys Command Line. If you currently have access to SSH on your server, you can generate SSH keys on the command line using the ssh-keygen utility which is installed by default on our servers.Run it on your server with no options, or arguments to generate a 2048-bit RSA key. 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. Aug 19, 2019  An SSH Key enables a secure passwordless method of logging into a remote server. Learn how to generate SSH keys on CentOS 7. An SSH Key enables a secure passwordless method of logging into a remote server. Learn how to generate SSH keys on CentOS 7. Create a /.ssh directory and authorizedkeys file on the CentOS server. Note: Administrators that have other users connecting to their sshd2 daemon should notify the users of the host-key change. If you do not, the users will receive a warning the next time they connect, because the host key the users have saved on their disk for your server does not match the host key now being provided by your sshd2 daemon. Jun 22, 2012  How To Set Up SSH Keys Step One—Create the RSA Key Pair. Step Two—Store the Keys and Passphrase. You can press enter here, saving the file to the user home (in this case, my example user is called demo). Step Three—Copy the Public Key. Once the key pair is generated.

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_keys file'. 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_rsa file. 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

Generate Ssh Host Key Files Windows 10

  • Download and run the PuTTY SSH client.
  • Type the IP address or Username + IP address ( user@x.x.x.x ) 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 user@x.x.x.x
  • When finished, end your session by pressing Ctrl+d.
How do I regenerate OpenSSH sshd server host keys stored in /etc/ssh/ssh_host_* files? Can I safely regenerate ssh host keys using remote ssh session as my existing ssh connections shouldn’t be interrupted on Debian or Ubuntu Linux? How do I regenerate new ssh server keys? How to regenerate new host keys on a Debian or Ubuntu Linux?
[donotprint][/donotprint]To regenerate keys you need to delete old files and reconfigure openssh-server. It is also safe to run following commands over remote ssh based session. Your existing session shouldn’t be interrupted.
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Why regenerate new ssh server keys?

Most Linux and Unix distribution create ssh keys for you during the installation of the OpenSSH server package. But it may be useful to be able re-generate new server keys from time to time. For example, when you duplicate VM (KVM or container) which contains an installed ssh package and you need to use different keys from cloned KVM VM guest/machine.

Steps to regenerate OpenSSH host keys on Linux

Let us see all steps

Step 1 – Delete old ssh host keys

Generate Ssh Key Github

Login as the root and type the following command to delete files on your SSHD server:
# /bin/rm -v /etc/ssh/ssh_host_*
Sample outputs:

Step 2 – Debian or Ubuntu Linux Regenerate OpenSSH Host Keys

Now create a new set of keys on your SSHD server, enter:
# dpkg-reconfigure openssh-server
Sample output:

You just regenerated new ssh server keys. You need to restart ssh server:
$ sudo systemctl restart ssh
OR
$ /etc/init.d/ssh restart

Step 3 – Update all ssh client(s) known_hosts files

Finally, you need to update ~/.ssh/known_hosts files on client computers, otherwise everyone will see an error message that read as follows:

Either remove host fingerprint or update the file using vi text editor (command must be typed on client machine):
$ ssh-keygen -R remote-server-name-here
Now login using the ssh command:
$ ssh vivek@server1.cyberciti.biz

Remove Ssh Host Key

Conclusion

You just regenerated OpenSSH Host Keys on a Debian or Ubuntu Linux using the dpkg-reconfigure command. For more info see the man page or this wiki page here:
$ man dpkg-reconfigure
$ man sshd

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