SSH

18 Guides Available

How to Enable SSH on Ubuntu 20.04 LTS

On Linode’s Ubuntu 20.04 LTS instances, the installation of ssh (client) and sshd (server) takes place when the instance is first started. The instructions that follow are to install the SSH if previously removed, or if a non-Linode installation is used. These instructions check if SSH services are correctly started on an Ubuntu instance. If ssh or sshd is not installed, instructions are supplied on how SSH (as OpenSSH) is installed on Ubuntu 20.04 LTS.

Use ssh-agent to Manage Private Keys

ssh-agent manages private keys for SSH connections, facilitating smoother SSH experiences and allowing you to use SSH sessions across programs. This guide aims to give you a full walkthrough of ssh-agent. The tutorial herein explains what ssh-agent is capable of and shows you how to use it.

Verifying the Authenticity of a Remote Server through Its SSH Key Fingerprint

Warning: The Authenticity of Host Can’t Be Established

The first time you connect to a remote server over SSH on a new machine, the SSH client warns you that the authenticity of a host can’t be established. This is message is normal and allows you to take extra precautions to make sure you’re connecting to the correct remote server. The output of this warning is similar to:

Connecting to a Remote Server Over SSH

A secure shell (SSH) is used for secure communication between devices. When most people refer to SSH, it is within the context of connecting from a local computer to a remote server, commonly for administration tasks related to website hosting.

Connecting to a Remote Server Over SSH on a Mac

Connecting to a Remote Server Over SSH on Chrome

SSH (secure shell) is used for secure communication between devices. When most people refer to SSH, it is within the context of connecting from a local computer to a remote server. This is a common task when administering a website, hosting environment, or even a Raspberry Pi or Arduino system.

Connecting to a Remote Server Over SSH on Linux

Connecting to a Remote Server Over SSH on Windows

Connecting to a Remote Server Over SSH using PuTTY

Use 2FA with SSH

In this guide, you’ll learn how to use one-time passwords for two-factor authentication with SSH. No matter what kind of data you’re hosting, securing access to your Linode is a critical step in preventing your information from being compromised. By default, you will need a password to log in, and you may also configure an authentication key-pair for even greater security. However, another option exists to complement these methods: time-based one-time passwords (TOTPs).

Use tmux (a Terminal Multiplexer)

What is tmux?

Tmux is a terminal multiplexer. It creates a host server on your Linode and connects to it with a client window. If the client is disconnected, the server keeps running. When you reconnect to your Linode after rebooting your computer or losing your Internet connection, you can reattach to the tmux session and the files you were working with will still be open, and the processes you had running will still be active.

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Using a YubiKey for 2FA when Logging in over SSH

How to use a GPG key for SSH authentication

Setting up an SSH Tunnel with Your Linode for Safe Browsing

Install a Mosh Server as SSH Alternative on Linux

Use SSH Public Key Authentication on Linux, macOS, and Windows

Public key authentication with SSH (Secure Shell) is a method in which you generate and store on your computer a pair of cryptographic keys and then configure your server to recognize and accept your keys. Password authentication is the default method most SSH clients use to authenticate with remote servers, but it suffers from potential security vulnerabilities like brute-force login attempts. Using key-based authentication offers a range of benefits, including:

Using GNU Screen to Manage Persistent Terminal Sessions

GNU Screen is a tool which works with a terminal session to allow users to resume a session after they have disconnected. Screen prevents a session from “timing out” or disconnecting SSH connections or local terminal emulators. A single Screen session has the ability to host multiple sessions or “windows.” Screen may be used for a variety of tasks such as maintaining persistent IRC sessions and multitasking in a terminal environment.

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How to use a GPG key for SSH authentication

Setting up an SSH Tunnel with Your Linode for Safe Browsing

Install a Mosh Server as SSH Alternative on Linux

Use SSH Public Key Authentication on Linux, macOS, and Windows

Using GNU Screen to Manage Persistent Terminal Sessions

Using SSHFS to Mount Remote Directories

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