Connecting to a Remote Server via SSH
Introduction
Secure Shell (SSH) is a protocol used to securely log onto remote systems (e.g. a workstation in Sherwood’s office). It is the most common way to access remote Linux servers (remote server = remote workstation). This page provides basic instructions on how to use SSH from a Linux terminal to connect to a remote server.
Prerequisites
Before connecting via SSH, ensure you have the following:
The remote server’s IP address or hostname (e.g.
cassowary2.device.utk.edu
)A valid username for the remote server (provided to you when your account is created)
Connecting via SSH
To connect to a remote server via SSH, open a terminal in your computer and type the following command:
ssh username@hostname
Replace username
with your user account on the remote server, and hostname
with the server’s IP address or hostname.
Example: connecting to cassowary
Let’s say your account was created on cassowary with the username xyz125
.
h
To connect to a remote server, an authentication system is required so that the server knows who you are and whether you have access. The most common authentication method is a password. However, for cassowary, we use a different type of authentication method called SSH keys. You first need to generate the so-called public-private key pair on your laptop. Then you need to copy your public key and send it to Sherwood, who’ll then add you to cassowary.
To generate a public-private key pair, open a terminal and type the following command:
ssh-keygen
It will ask you where to store the key pair. Just press enter to accept the default value (~/.ssh/id_rsa
). Then enter the passphrase that you like (DO NOT leave it empty). This will generate the key pair.
To display your public key in the terminal, type:
cat ~/.ssh/id_rsa.pub
Copy the entire output of this command and send it to Sherwood.
Once your public key has been added, you can connect to cassowary. To connect, open a terminal in your laptop and type the following command:
ssh xyz125@cassowary2.device.utk.edu
This should give a shell on cassowary. You can now run your codes!