Jun 09, 2018 H ow do I regenerate OpenSSH sshd server host keys stored in /etc/ssh/sshhost. 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? Since you mean SSH:) Normally, you generate a key on your local machine using ssh-keygen and send your public key (.ssh/idrsa.pub) to be added to the file.ssh/authorizedkeys in your home directory on the server. That should let you log in without a password on the server, and no one but you (including the server owner) has your private key, so it can be reused for login on other servers too. How to set up ssh so you aren't asked for a password. Generate both a private and a public key. You want to access debian.org systems with such a key, it's. Documentation remote-access ssh passwordless Passwordless SSH access. It is possible to configure your Pi to allow your computer to access it without providing a password each time you try to connect. To do this you need to generate an SSH key: Check for existing SSH keys.
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ow 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 ![]()
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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
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Step 1 – Delete old ssh host keys
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: Ssh Keygen Generate Public Key From PrivateStep 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:
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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 [email protected]
ConclusionDebian Generate Ssh Private Keys
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
Debian 10 Ssh
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