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.
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https://devopsmyway.com/passwordless-ssh-login-using-public-key-and-private-key/