Raspberry Pi_Eng_19.1.1 Checking System Status

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19.1 CPU, Memory and Task

CPU and memory are the resources that the system has, and it is the task or process that uses these resources to perform the works specified by the user. Therefore, it is necessary to monitor the available resources in the system and the processes that are using resources at the present time to check whether there is a problem in the current work processing state.

19.1.1 Checking System Status

19.1.1.1 “top” Command – Check Main System Information

You can use the “top” command to check the overall status of the system.

Raspberry Pi_Eng_18.4.2 Remote Drive Connection Using SCP Program

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18.4.2 Remote Drive Connection Using SCP Program

SCP (Secure Copy) is a program that sends and receives files to and from a remote computer using SFTP or SCP protocol through SSH.

18.4.2.1 Installing/Enabling SSH server Program

This program basically assumes that SSH server of the remote computer is running. To do this, you must first enable the SSH server in the Raspberry Pi system. For details, see the description of [9.9.1 Enabling SSH].

Raspberry Pi_Eng_18.4.1 Remote Drive Connection Using SambProgram

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18.4 Remote Drive Connection

18.4.1 Remote Drive Connection Using Program

18.4.1.1 Installing Server Program

The program allows you to use files of remote Raspberry Pi system as a network drive.

First, we install the program as shown below.

Raspberry Pi_Eng_18.3.2 Desktop GUI connection Using VNC Program

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18.3.2 Desktop GUI connection Using VNC Program

VNC (Virtual Network Connection) is a connection method that connects to a remote computer from my local computer and provides the ability to control the computer at will as if it were my own computer.

VNC program consists of a VNC server and a VNC client, each of which interacts with each other remotely.

Raspberry Pi_Eng_18.3.1 Remote Desktop Connection Using XRDP Program

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18.3 Remote Desktop GUI connection

18.3.1 Remote Desktop Connection Using Program

As a way to connect to Raspberry Pi system from MS Windows, you can use “Remote desktop connection” method which is used as standard when connecting to remote system from MS Windows.

Raspberry Pi_Eng_18.2.4 SSH Connection with PuTTy Program in MS Windows

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18.2.4 SSH Connection with Program in MS Windows

SSH client program is required to access Raspberry Pi system with SSH in MS Windows. There are a number of programs that can be used as SSH clients, and you can use anyone that supports SSH.

Here, we will use the Putty program, which is free and offers a lot of features, so many people use it as standard. PuTTY is a program developed by Simon Tatham that provides Telnet and SSH functions on MS Windows or Unix series computers, and basically provides functions which is the type of terminal emulator. To download the Putty program, you can use the following URL:

Raspberry Pi_Eng_18.2.3 SSH Connection on Unix/Linux Series, and Apple Mac

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18.2.3 SSH Connection on Unix/Linux Series, and Apple Mac

The SSH client program is installed by default in these operating systems, so no separate program installation is required. To connect to the Raspberry Pi system using SSH, use “ssh” command. The following command is a command format on Linux. The command on Apple Mac is similar, and check details if necessary.

Raspberry Pi_Eng_18.2.2 Configuring SSH Server

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18.2.2 Configuring SSH Server

To remotely connect to the Raspberry Pi system via SSH, the SSH server in the Raspberry Pi system must be enabled. To configure the SSH server on the Raspberry Pi system, use the “raspi-config” command. For details, see the description of [9.9.1 Enabling SSH].

Raspberry Pi_Eng_18.2.1 Features of SSH

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18.2 Remote Terminal Connection

18.2.1 Features of SSH

There are several programs that support remote terminal connections. In the past, a program called Telnet that supports remote terminal connections has been used widely. However, this program has a serious security problem because it transmits communication data in a text format without encrypting it, so it is rarely used now.

Raspberry Pi_Eng_02.3 SD Card Slot

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.3 SD Card Slot

Raspberry Pi supports SD card which is a type of flash memory for a storage device for installing operating system or storing necessary data. The SD card has less capacity and performance than a hard disk, but it has the advantage that it consumes less power than a normal hard disk.

In Raspberry Pi, an SD card has a special meaning, unlike in other computer systems. When Raspberry Pi is powered up and started for the first time, a special program called Boot Loader is supposed to read the operating system installed on Raspberry Pi from the SD card. If you do not have an SD card or you do not have the proper operating system installed on your SD card, you can not start the Raspberry Pi system.