Jun 12, 2013 In Ubuntu 12.04 the ssh service is called ssh not sshd. In the file /.ssh/authorizedkeys each and every key must be on its own single line. Before you disable password logins in /etc/ssh/sshdconfig test if your key authentication works properly. PuTTY Key Generator saves the key file with line endings. Copying and pasting it will not work. Jul 29, 2019 Establishing an SSH (Secure Shell) connection is essential to log in and effectively manage a remote server. Encrypted keys are a set of access credentials used to establish a secure connection. This guide will walk you how to generate SSH keys on Ubuntu 18.04. As well as offering additional security, SSH key authentication can be more convenient than the more traditional password authentication. When used with a program known as an SSH agent such as PuTTY, SSH keys can allow you to connect to a server, or multiple servers, without having to remember or enter your password for each system. PuTTY does not natively support the private key format for SSH keys. PuTTY provides a tool named PuTTYgen, which converts keys to the required format for PuTTY. You must convert your private key (.pem file) into this format (.ppk file) as follows in order to connect to your instance using PuTTY.
I am a new Ubuntu 18.04 LTS user and I would like to setup ssh public key authentication. How do I set up ssh keys based authentication on Ubuntu Linux 18.04 LTS server? How do I set up SSH keys on an Ubuntu Linux 18.04 LTS server? In Ubuntu 18.04 LTS, how do I set up public key authentication?
Introduction: OpenSSH is a free and open source client/server technology for secure remote login. It is an implementation of the SSH protocol. OpenSSH divided into sshd (server) and various client tools such as sftp, scp, ssh and more. One can do remote login with OpenSSH either using password or combination of private and public keys named as public key based authentication. It is an alternative security method for user passwords. This method is recommended on a VPS, cloud, dedicated or even home-based server or laptop. This page shows how to set up SSH keys on Ubuntu 18.04 LTS server.
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Ubuntu 18.04 Setup SSH Public Key Authentication
The procedure to set up secure ssh keys on Ubuntu 18.04:
Sample set up for SSH Keys on Ubuntu 18.04Where,
In public key based method you can log into remote hosts and server, and transfer files to them, without using your account passwords. Feel free to replace 202.54.1.55 and client names with your actual setup. Enough talk, let’s set up public key authentication on Ubuntu Linux 18.04 LTS.
How to create the RSA/ed25519 key pair on your local desktop/laptop
Open the Terminal and type following commands if .ssh directory does not exists:
$ mkdir -p $HOME/.ssh Next generate a key pair for the protocol, run: $ ssh-keygen OR $ ssh-keygen -t rsa 4096 -C 'My key for Linode server' These days ED25519 keys are favored over RSA keys when backward compatibility is not needed: $ ssh-keygen -t ed25519 -C 'My key for Linux server # 42' How to install the public key in Ubuntu 18.04 remote server
The syntax is as follows:
ssh-copy-id your-user-name@your-ubuntu-server-name For example: ## for RSA KEY ## I am going to install ssh key for a user named vivek (type command on your laptop/desktop where you generated RSA/ed25519 keys): $ ssh-copy-id -i ~/.ssh/id_ed25519.pub [email protected] Test it
Now try logging into the Ubuntu 18.04 LTS server, with ssh command from your client computer/laptop using ssh keys:
$ ssh your-user@your-server-name-here What are ssh-agent and ssh-add, and how do I use them on Ubuntu 18.04?
To get rid of a passphrase for the current session, add a passphrase to ssh-agent (see ssh-agent command for more info) and you will not be prompted for it when using ssh or scp/sftp/rsync to connect to hosts with your public key. The syntax is as follows:
$ eval $(ssh-agent) Type the ssh-add command to prompt the user for a private key passphrase and adds it to the list maintained by ssh-agent command: $ ssh-add Enter your private key passphrase. Now try again to log into [email protected] and you will NOT be prompted for a password: $ ssh [email protected]
How to disable the password based login on a Ubuntu 18.04 server![]()
Login to your server, type:
## client commands ## Now login as root user: $ sudo -i OR $ su -i Edit sshd_config file: # vim /etc/ssh/sshd_config OR # nano /etc/ssh/sshd_config Find PermitRootLogin and set it as follows: PermitRootLogin no Save and close the file. I am going to add a user named vivek to sudoers group on Ubuntu 18.04 server so that we can run sysadmin tasks: # adduser vivek sudo Restart/reload the sshd service: # systemctl reload ssh You can exit from all session and test it as follows: $ ssh [email protected]
How do I add or replace a passphrase for an existing private key?
To to change your SSH passphrase type the following command:
$ ssh-keygen -p
How do I backup my existing private/public SSH keys
Just copy files to your backup server or external USB pen/hard drive:
How do I protect my ssh keys?![]()
Tip: Create and setup an OpenSSH config file to create shortcuts for servers
See how to create and use an OpenSSH ssh_config file for more info.
Generate Ssh Key UbuntuHow do I secure my OpenSSH server?Putty Setup Ssh Key
See “OpenSSH Server Best Security Practices” for more info.
Ubuntu Generate Ssh Key For Putty FreeConclusion
You learned how to create and install ssh keys for SSH key-based authentication for Ubuntu Linux 18.04 LTS server. See OpenSSH server documents here and here for more info.
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