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--- skill-tree:use:1:4:b [2020/06/07 18:14] – [Background] luciana
+++ skill-tree:use:1:4:b [2025/04/16 18:30] (current) – external edit 127.0.0.1
@@ Line 1: / Line 1: @@
-# USE1.4-B Software Environment
+# USE1.4 Remote Access
-# Background
-HPC systems have generally installed multiple versions of several essential software tools and software environments.
-Package management tools provide access to this wide variety of software.
-A user has to load the software for the current shell session to make commands available.
-The widely available software tools are:
+An HPC system is accessed remotely and has its particular file systems that contain data and programs to execute.
-  * Environment modules
+Learning the ways of general interaction with the remote system and the tools involved is essential for newcomers.
-  * Spack
-# Aim
+Users must connect to an HPC system typically using the Secure Shell (SSH), which then starts a shell and allows the interactive access.
-  * To utilize different package management tools to make software available
+When the user disconnects, such a session is terminated.
+A server-sided session that persists after disconnection enables the user to execute long-running programs remotely and allows the continuation of a previous session seamlessly.
+Data transfer between a local user system (e.g., desktop or laptop) and a remote system requires special tools.
+Interactive access is also allowed.
+The tools discussed here are generally valid for systems using Linux, Mac, Windows, and also mobile devices.
+## Requirements
+## Learning Outcomes
+* Describe how SSH-authentication works:
+    * Password authentication.
+    * Public-key authentication.
+    * The role of an authentication agent and the security implications.
+* Generate an SSH public/private key under Linux.
+* Register a key for public-key authentication using ssh-copy-id.
+* Perform a remote login from Linux using SSH.
+* Use SSH-agent or Windows equivalents.
+* Use Agent forwarding to connect to a third HPC system from an HPC system that you logged into with ssh from your computer.
+* Know when to use and how to create a config file.
+* Utilize tools to transfer data between the local and remote system:
+    * scp
+    * sftp
+    * rsync (-avz)
+* Describe how SSHFS allows mounting a remote directory to a local directory for interactive usage (Mac/Linux only), e.g. for copying files or to transparently use your favourite graphical text editor on the local computer for editing files on the remote cluster.
+* Utilize screen and tmux to preserve a session between logins:
+    * Creation of a session.
+    * Detaching from the current session.
+    * Resuming a previous session.
-# Outcomes
-  * Understand shell variables relevant for executing software and for building software
-  * Query available software using package manager
-  * Select the appropriate versions for deployment to the session environment
-# Subskills
-  * [[skill-tree:use:1:4:1:b]]
-  * [[skill-tree:use:1:4:2:b]]
-  * [[skill-tree:use:1:4:3:b]]