Ssh Private Key And Public Key

The private keys need to be stored and handled carefully, and no copies of the private key should be distributed. The private keys used for user authentication are called identity keys. Setting Up Public Key Authentication for SSH. The following simple steps are required to set up public key authentication (for SSH). To perform private key authentication, you will also need the passphrase, which together with the private key, will allow authentication. What is really needed is for RenciSSH to get with the times and write a publickeyauthentication method. Using a Public/Private key to authenticate when logging into SSH can provide added convenience or added security. The Public/Private key can be used in place of a password so that no username/password is required to connect to the server via SSH. Instead, the unique public and private keys provide secure authentication. It is advised that the.

Ssh Private Key And Public Key Differences
Ssh Using Public Key
Retrieve Ssh Private Key From Public Key

This tutorial explains the Passwordless SSH using Public Key and Private Key in Linux.

SSH stands for Secure SHELL, is a protocol used to connect remote hosts to login or performing some tasks using scripts.

When we want to automate some tasks on remote hosts using scripts from a centralized server like Jenkins/Ansible or any Linux Server, we may require a password less connection between the remote hosts and the centralized Server.

In this tutorial, we will learn to create Passwordless SSH login using public key and private key. Follow the step by step guide to make your ssh connection passwordless.

This tutorial will work for Linux Destro such as Centos, Ubuntu, Redhat, Amazon Linux(AWS EC2) and Other as well.

Recommended Read:How to Install Jenkins on Ubuntu

Also Read : Git Tutorial for beginners (Part I)

Scenario

We have one Local Machine and one Remote Server.We will setup a passwordless connection to login Remote Server from the local Machine.

Perform following steps on the remote Server

Step 1– Create an User and login or login as an existing user.

$ useradd devops

$ su – devops

Step 2 – Generate a key pair ( Public key and Private Key) using ssh-keygen command.

Before running this command make sure you are on home directory of the user.If not you can go to the home directory by cd ~ command.

$ cd ~

$ ssh-keygen -t rsa

It will ask for some details. Do not put anything here and press ENTER only.

By ls -al command you can see a hidden directory .ssh and two files namely id_rsa and id_rsa.pub inside .ssh directory are created.Here id_rsa is the Private key and id_rsa.pub is the Public Key.

Private key(id_rsa) is kept at source computer(local machine) from where you have to ssh. Public Key(id_rsa) is kept at Destination Server(Remote Server) , the Server you want to access.

Step 3- Create a file name authorized_keys in side .ssh directory and copy the content of id_rsa.pub file to authorized_keys file.

Go to .ssh directory

$ cd ~/.ssh/

Create an empty file name authorized_keys

$ touch authorized_keys

Copy the content of id_rsa.pub to authorized_keys

$ cat id_rsa.pub > authorized_keys

Check the authorized_keys file if contents are copied.

$cat authorized_keys

Step 4 – Change the permission of authorized_keys

$ chmod 600 authorized_keys

Step 5– Copy the content of id_rsa file

Use cat command to display the content of id_rsa and copy its content.

$ cat id_rsa

On the local Machine

Step 1– Create a file and paste the content of id_rsa copied from remote server inside this file. You can use nano command to perform this action.

Create a file name devops.key using nano command , paste the content and pres Ctrl+X to save and close the file.

$ nano devopys.key

Which mac support software do i download for bootcamp. Step 2 – SSH remote Server from local machine without using password.

$ sudo ssh -i path-to-private-key [email protected]

$ sudo ssh -i devops.key [email protected]