I want to add a user to Red Hat Linux that will not use a password for logging in, but instead use a public key for ssh. This would be on the command line. You realize the 'ssh-keygen -t dsa' command will create keys for the current user, it might replace your own keys – yarun can Jun 25 '18 at 0:18. Add a comment 16.
SSH uses public-key cryptography to authenticate the remote computer and allow the remote computer to authenticate the user, if required. You can create ssh keys as follows on any Linux or UNIX-like operating systems including Mac OS X.[donotprint][/donotprint]
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ssh-keygen command to Generate SSH Keys
The ssh-keygen command generates, manages and converts authentication keys for ssh client and server usage. Type the following command to generate ssh keys (open terminal and type the command):
$ ssh-keygen Generate SSH keys looks as follows:
The above command creates ~/.ssh/ directory. So if your user name is vivek, than all files are stored in /home/vivek/.ssh/ or $HOME/.ssh/ directory as follows:
Please note that the passphrase must be different from your current password and do not share keys or passphrase with anyone. Also, make sure you have correct and secure permissions on $HOME/.ssh/ directory:
SSH Keys Are Generated, What Next?Generate Ssh Key For Linux User
You need to copy $HOME/.ssh/id_rsa.pub file to remote server so that you can login using keys instead of the password. Use any one of the following command to copy key to remote server called vpn22.nixcraft.net.in for vivek user:
ssh-copy-id [email protected] On some *nix system such as OS X ssh-copy-id command may not be installed, use the following commands (when prompted provide the password for remote user account called vivek) to install/append the public key on remote host: ssh [email protected] 'umask 077; mkdir .ssh' To login simply type: ssh [email protected] The following command will help to remember passphrase exec ssh-agent $SHELL
Optional ssh-keygen command syntax for advance users
The following syntax specifies the 4096 of bits in the RSA key to creation (default 2048):
ssh-keygen -t rsa -b 4096 -f ~/.ssh/aws.key -C 'My AWs cloud key' Where,
Now install the ~/.ssh/aws.key, run:
ssh-copy-id -i ~/.ssh/aws.key user@aws-server-ip Test it with the ssh command: ssh -i ~/.ssh/aws.key ec2-user@aws-server-ip See “How To Set up SSH Keys on a Linux / Unix System” for more info. Conclusion![]()
You learned how to create and generate ssh keys using the ssh-keygen command. Generate certificate and private key openssl.
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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.
Creating an SSH key on Windows
The simplest way to create SSH key on Windows is to use PuTTYgen.
How To Generate Ssh KeysCreating 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.
Adding an SSH key to your control panelGenerate Ssh Key For User Ubuntu
Limitations
Connecting to a server using an SSH key from a Windows client
Generate Ssh Key For User Linux ServerConnecting to a server using an SSH key from a Linux clientGenerate Ssh Key For User Linux Download![]()
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