How to remove an ssh key?

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I currently have an old SSH key uploaded on a server. The problem is I lost my ~/.ssh directory (with the original id_rsa and id_rsa.pub files).

Consequently, I want to remove the old SSH key directly on the server and upload a new one.

I tried the following command without success:

$> ssh-add -D

Is there a way to completely remove an SSH key?


Delete SSH Keys Command for Linux and Unix, Note that there is at least two bug report for ssh-add -d/-D not removing keys: "​Debian Bug report #472477: ssh-add -D does not remove SSH  The warning is understandable, but even if I run that command to remove the old key, logging in still gives me the warning: Warning: Permanently added '<hostname>' (ECDSA) to the list of known hosts. Warning: the ECDSA host key for '<hostname>' differs from the key for the IP address '<ip>' Offending key for IP in ~/.ssh/known_hosts:96


If you're trying to perform an ssh-related operation and get the following error:

$ git fetch
no such identity: <ssh key path>: No such file or directory

You can remove the missing ssh key from your ssh agent with the following:

$ eval `ssh-agent -s`  # start ssh agent
$ ssh-add -D <ssh key path>  # delete ssh key

How to remove an ssh key?, Use this command to remove entries from known_hosts: ssh-keygen -R hostname. If you need to add or remove the public SSH key from project or instance metadata, format the public SSH key file. gcloud . If you have already connected to an instance through the gcloud tool, your keys are already generated and applied to your project or instance. The key files are available in the following locations: Linux and macOS


Unless I'm misunderstanding, you lost your .ssh directory containing your private key on your local machine and so you want to remove the public key which was on a server and which allowed key-based login. In that case, it will be stored in the .ssh/authorized_keys file in your home directory on the server. You can just edit this file with a text editor and delete the relevant line if you can identify it (even easier if it's the only entry!). I hope that key wasn't your only method of access to the server and you have some other way of logging in and editing the file. You can either manually add a new public key to authorised_keys file or use ssh-copy-id. Either way, you'll need password auth set up for your account on the server, or some other identity or access method to get to the authorized_keys file on the server.

ssh-add adds identities to your ssh agent which handles management of your identities locally and "the connection to the agent is forwarded over SSH remote logins, and the user can thus use the privileges given by the identities anywhere in the network in a secure way." (man page), so I don't think it's what you want in this case. It has no way to get your public key onto a server without you having access to said server via an ssh login as far as I know.

Is it possible to remove a particular host key from SSH's , I tried removing and recreating without success. I manually added the same new key on my local machine, my droplet, and updated the key via  A possible workaround: Do ssh-add -D to delete all your manually added keys. This also locks the automatically added keys, but is not much use since gnome-keyring will Navigate to your ~/.ssh folder and move all your key files except the one you want to identify with into a separate folder


I opened "Passwords and Keys" application in my Unity and removed unwanted keys from Secure Keys -> OpenSSH keys And they automatically had been removed from ssh-agent -l as well.

How to cleanup SSH keys?, From man ssh-keygen (SSH-KEYGEN(1)). -R hostname Removes all keys belonging to hostname from a known_hosts file. This option is useful  Generating a key disables the Generate Key button, and there’s no Delete Key button: It’s obvious from the screenshot that the key is in a file named id_rsa.pub, which is in a folder.ssh somewhere on my machine, and that I apparently just needed to delete this file.


How to properly remove an old ssh key, sed -i '6d' ~/.ssh/known_hosts. Will modify the file ~/.ssh/known_hosts:6 , removing the 6th line. In my opinion, using ssh-keygen -R is a better solution for an  SSH keys have no standard location. If you generated them using OpenSSH's ssh-keygen or PuTTY's PuTTYgen, all you need is to delete the key files you created. (OpenSSH keeps them in ~/.ssh/ by default.) Don't forget a free-space wipe (cipher /w:C:\ will do).


Remove key from known_hosts, Deleting Host Keys by Removing Files. If you want to remove all Host SSH keys from your Linux system, and you can directly remove all SSH  > delete user-file ssh-known-hosts user username admin To delete entries for all hosts and for all users: > delete user-file ssh-known-hosts user username all To delete entries for all hosts for user logged in: > delete user-file ssh-known-hosts self PAN-OS 7.0. To delete entry for a specific host for a specific user (ex. admin):


How To Delete a Particular Host SSH Key in Linux, Removing an SSH key. From the Devices menu, select Manage > SSH Keys. Click the Remove  If you ever want to delete ssh-rsa keys in Linux, you just need to edit  known_hosts file under.ssh folder.


How to remove an SSH key from server,