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--- skill-tree:use:1:5:b [2020/06/05 17:06] – external edit 127.0.0.1
+++ skill-tree:use:1:5:b [2025/03/10 19:24] (current) – external edit 127.0.0.1
@@ Line 1: / Line 1: @@
-# USE1.5-B Remote Access
+# USE1.5 Overview: Software Environment
-# Background
-A HPC system is accessed remotely and has its own file systems that contain data and programs to execute.
+HPC systems have generally installed multiple versions of several essential software tools and software environments.
-Learning the ways of general interaction with the remote system and tools involved is essential for newcomers.
+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.
-Users must connect to a HPC system typically using the Secure Shell (SSH) which then starts a shell and allows for interactive access.
+The widely available software tools are:
-When the user disconnects such a session is terminated.
+  * Environment modules
-Starting of a server-sided session that persists after disconnection enables to execute long-running programs remotely and allows to seamlessly continue on a  previous session.
+  * Spack
-Data transfer between a local users system (e.g., desktop or laptop) and remote system requires special tools and allows even for interactive access.
-Tools discussed are generally valid for user systems using Linux, Mac, and Windows but also mobile devices.
+## Learning Outcomes
+  * Understand shell variables relevant for executing and building software.
+  * Query available software using the package manager.
+  * Select the appropriate versions for deployment in the session environment.
+  * Describe the general dependency structure of software.
+  * Describe how a package manager makes software available.
+  * Use the export command to print shell variables.
+  * Understand shell variables relevant for executing and building software:
+    * PATH for executables
+    * LD\_LIBRARY\_PATH for libraries
+    * MANPATH for manual pages (man command)
+    * PKG\_CONFIG\_PATH for pkg-config
+  * Manipulate shell variables to include additional software:
+    * Setting shell variables for a single program by prefixing or by using export.
-# Aim
+## Subskills
-  * To understand how to access a remote server and transfer data.
+  * [[skill-tree:use:1:5:1:b]]
+  * [[skill-tree:use:1:5:2:b]]
-# Outcomes
+  * [[skill-tree:use:1:5:3:b]]
-  * 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
-  * Registering a key for public-key authentication using ssh-copy-id
-  * Perform a remote login from Linux using SSH
-  * Know when to use and how to create a config file
-  * Utilize tools to transfer data between local and remote system
-    - scp
-    - sftp
-    - rsync (-avz)
-  * Describing how SSHFS allows to mount a remote directory to a local directory for interactive usage (Mac/Linux only)
-  * Utilizing screen and tmux to preserve a session between logins
-    - creation of a session
-    - detaching from the current session
-    - resuming a previous session
-# Subskills