Sftp Generate New Host Key Known Hosts

Jul 11, 2014  We can also add levels of host authentication into the mix so we can be sure that we are connecting to the host we think we are or “knownhosts” or SSH Known Hosts. Here we expand the knownhosts mechanism and expand to create a centralize your knownhosts file on CentOS 7. The Server’s Public Key.

SSH keys are a way to identify trusted computers, without involving passwords. The steps below will walk you through generating an SSH key and adding the public key to the server.

Step 1: Check for SSH Keys

First, check for existing SSH keys on your computer. Open Git Bash, Cygwin, or Terminal, etc. and enter:

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_dsa.pub
  • is_ecdsa.pub
  • id_ed25519.pub
  • id_rsa.pub

If you see an existing public and private key pair listed (for example id_rsa.pub and id_rsa) that you’d like to use, you can skip Step 2 and go straight to Step 3.

Step 2: Generate a new SSH key

Winscp Host Key Cache

With your command line tool still open, enter the text shown below. Make sure you substitute in your email address:


You’ll be asked to enter a passphrase, or simply press Enter to not enter a passphrase:

After you enter a passphrase (or just press Enter twice), review the fingerprint, or ‘id’ of your SSH key:

Step 3: Add your key to the ssh-agent

To configure the ssh-agent program to use your SSH key, first ensure ssh-agent is enabled.

If you are using Git Bash, turn on the ssh-agent with command shown below instead:

Then, add your SSH key to the ssh-agent:

Step 4: Add your SSH key to the server

To add your public SSH key to the server, you’ll copy the public SSH key you just created to the server. Substitute “username” with your username on the server, and “server.address.com” with the domain address or IP address of your server:

Sftp Generate New Host Key Known Hosts Today

The server will then prompt you for your password:

Sftp Generate New Host Key Known Hosts 2017

That’s it! You should now be set up to connect to the server without having to authenticate.