How do I create a host key file to use with my applications as I can not use system defined /etc/ssh/ssh_host_rsa_key for non-root account under Linux / Unix / Apple OS X / *BSD operating systems?
You need to use a command called ssh-keygen. This command generates, manages and converts authentication keys for ssh. It can create RSA keys for use by SSH protocol version 1 and RSA or DSA keys for use by SSH protocol version 2. he type of key to be generated is specified with the -t option. If invoked without any arguments, ssh-keygen will generate an RSA key for use in SSH protocol 2 connections. The -f option specifies the filename of the key file.
Why create a new host key files?
SSH keys can serve as a means of identifying yourself to an SSH server using public-key cryptography and challenge-response authentication.The major advantage of key-based authentication is that in contrast to password authentication it is not prone to brute-force attacks and you do not expose valid credentials, if the server has been compromised. Aug 19, 2019 Secure Shell (SSH) is an encrypted protocol used by Linux users to connect to their remote servers. Generally, there are two ways for clients to access their servers – using password based authentication or public key based authentication. Using SSH keys for authentication is highly recommended, as a safer alternative to passwords.
You may need a new key file:
- Your system is compromised.
- Your keys are stolen.
- You forgotten the passphrase.
- Your application need a new host key.
- You can not read the default system key files stored in /etc/ssh/ directory but your non-root application needs key.
- You got an error message which read as “Could not load host key: /etc/ssh/ssh_host_key*”.
ssh-keygen Syntax
The syntax is:
Linux Generate Ssh Key For Root 1
Example
Create a host key file in your $HOME/.ssh/myapp as follows. First, create a directory to store your host key file, enter:$ mkdir -p $HOME/.ssh/myapp
To create a host RSAv2 key file, run:$ ssh-keygen -t rsa -f $HOME/.ssh/myapp/rsa_key_file
Sample outputs:
Type the following commands to verify the keys:$ ls -l $HOME/.ssh/myapp/
Sample outputs:
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You can now use keys with your app:$ mycool-app -key $HOME/.ssh/myapp/rsa_key_file -d
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