Linux - Overview

Description

Linux Kernel is a world wide used an known OS kernel. This software provides basic management for the components of a computer and the communication with the users. Providing a secure use and access for each component, hardware or human. It manages this by treating everything (in the software side) as a file, and each file has permissions for writing, reading, executing, among others.

Visualization

Context Containers

Quality Attributes

1. Availability A pack of tasks arrive, and they need to be resolved fast.
   1. Scenario description: Users/Modules are making system calls.
   2. Source: Module.
   3. Stimulus: Finish task X.
   4. Artifact: System.
   5. Environment: Heavy traffic.
   6. Response: Solve task X.
   7. Response Measure: No hanging time.
2. Security. Program needs to read a file.
   1. Scenario description: Program needs a constant unmodified file with it’s values.
   2. Source: Executable.
   3. Stimulus: Read a file.
   4. Artifact: System.
   5. Environment: Normal Environment.
   6. Response: No reads/writes allowed on that file.
   7. Response Measure: Continuous and reliable system function.
3. Usability: User needs to read a file
   1. Scenario description: User access the system and tries to read the file.
   2. Source: User.
   3. Stimulus: Show file contents.
   4. Artifact: System.
   5. Environment: Normal environment.
   6. Response: Show the file contents.
   7. Response Measure: Open the file, if the user meets the permissions.