6.1.2 Overview of System Connection
6.1.2.1 Console and Terminal Concept
These terms have expanded its meaning along with the history of computer development in the past, and they are still mixed in various meanings. Raspberry Pi is a very small computer, unlike a typical large computer. To simplify the discussion in this environment, we want to simplify the meaning of the terms used and make them easier to understand.
6.1 Overview of System Connection
6.1.1 Basic Diagram of Sysem Configuration
Modern large computer systems usually have the following configuration and interrelationships each other.
At the center of the computer system framework is the central computer responsible for handling all the computers in the system configuration. This central computer usually consists of one or more main server computers and a console computer for system administrators who manage those computers is connected toit. These are typically managed within a computer room or data center that is managed separately under special control, control access through a variety of physical security devices, and control many unauthorized external connections using many network security devices.
Chapter 6 System Connection & Termination
Chapter’s Main Topics
This chapter will briefly discuss the basic concepts and related terms of modern computer system and system access in a network environment. It also guides you through the procedure and method of termination according to the system connection method.
It includes descriptions on the following topics:
■ Overview of system connection
■ Local connection
■ Sysem connection and termination
5.4 System Termination
5.4.1 How to Terminate the System
To exit from a system running on a Linux system, you can use the following command:
■ Shutdown — Shut down the system normally.
■ Halt — halt the sysem.
■ Reboot — Halt the system, shut it down, and restart the system.
5.3 Sysetm Logout
5.3.1 Meaning of Logout
Logout is to terminate processing for a particular user who is logged on to the system, leaving the entire operating system intact. Therefore, all the jobs that the user is processing are stopped, and when all the specified jobs are stopped, all the system resources used by the user are released, and the system is disconnected from the user. Logging out a specific user account will only terminate that account and will not affect other user accounts running on the system.
5.2 System Logon
5.2.1 Meaning of Logon
“Logon” means that a “worker” is assigned to perform work on a computer system, obtain work privilege, and enter the computer system. In a computer system, the worker is usually represented as a “user account”, and an ID is assigned to the account different from other user accounts, and each ID is also usually designated with a password. Therefore, in the logon process, the user account ID and the password for the account are input to check whether the corresponding ID is already registered or the password is matched with the one registered with the corresponding ID.
5.1 System Booting
5.1.1 Meaning of Booting
Once the operating system is installed on the system, the system can be started. Booting is the process by which an installed operating system program starts to work, read all the basic programs needed for system operation from the storage device, move it into memory, and then make it ready to run.
Chapter 5 System Startup and Shutdown
Chapter’s Main Topics
This chapter describes how to operate the Raspberry Pi system with the operating system installed. It describes the basic procedures for how to start, use, and exit the system.
It includes descriptions on the following topics:
■ System booting
■ System logon
■ System logout
■ System shutdown
4.6.3 Operating Operating System Installed
When the image copy operation for the operating system is completed on the SD card, the installation work for the system is completed. No additional installation work is required.
Connect all external devices such as monitor, keyboard and mouse to the Raspberry Pi system. Prepare the system so that can connect internet access by connecting the LAN cable.
4.6.2 Copying Image File to SD Card
You should copy the prepared image file to the prepared SD card and make the SD card with the operating system installed.
If you copy an image file to an SD card just like you would copy a regular file, the image of the operating system will not be copied correctly. It must be copied to the SD card in the way that the image is transferred to the SD card.