Tutorial 1: Using Your Matrix Server Account

LEARNING ABOUT YOUR MATRIX SERVER ACCOUNT

Main Objectives of this Practice Tutorial

• Understand the purpose of the Matrix server and the advantages of combining Linux servers to form a cluster.

• List the steps to connect to your Matrix server account in the computer labs at Seneca College.

• List the steps to connect to your Matrix server account from a computer outside of Seneca College.

• Working with the Linux Command Prompt (Linux shell)

• Changing your Matrix Account Password

• Exiting your Matrix Linux Account

• Performing Review Questions for Additional Practice

Purpose of Having a Matrix Account

While attending Seneca College, you will be using many different computer systems to perform various operations. Some of these servers include:

my.senecacollege.ca	Learning Content Management System (Student Grades / Notes / Online Quizzes)
ict.senecacollege.ca	Main ICT Webserver
wiki.cdot.senecacollege.ca	Course WIKIs for Seneca College Students
matrix.senecacollege.ca	Linux Account for Student Practice and Assignment submission

A shell is simply an interface / interpreter to allow a user to communicate with the Linux computer system.

Although you need to study concepts throughout this course, you will also need to learn to issue and memorize simple as well as more advanced Linux commands. This requires that you practice issuing Linux commands on a frequent basis to become more comfortable when working the Unix and Linux command-line environments.

Just like with other operating systems like MS Windows, it is important to learn how to open a command prompt in order to issue Linux commands to perform common Linux OS tasks. In Unix/Linux, a shell is simply an interface / interpreter to allow a user to communicate with the Linux computer system (server). Linux shells have evolved (improved) over a period of time. You will be using the Bash Shell which is considered to be user-friendly.

Layout of the Matrix Server

The Matrix server consists of several Virtual Computers all connected together to form a cluster. A cluster is a cost effective alternative to larger servers.

The Matrix server consists of several Virtual Computers connected together to form a cluster. A cluster is a cost effective alternative to buying larger servers.

All registered students in this course have access to an account on the Matrix server. You will be using this account for the following reasons:

• Issuing Linux commands
• Becoming productive using the Linux command prompt (shell)
• Performing Linux Practice Tutorials
• Performing Linux Assignments (3)
• Practice Issuing Linux Command Review Questions

In the next section, you will learn how to connect to and login to your Matrix server account both at a college lab workstation and from a remote computer such as your home computer or your laptop computer.

INVESTIGATION 1: ACCESSING YOUR MATRIX LINUX ACCOUNT

In this section, you will learn how to access your Matrix Linux account by two different methods:

• From a workstation within a Seneca College lab
• From your own computer within or outside Seneca College

Part 1: Accessing your Matrix Account from a Seneca College Lab

MyApps (AppsAnywhere) Main Window

You will learn how to connect to your Matrix Linux account from a workstation in your computer labs at Seneca college.

This would be useful if you do not have a notebook computer and are required to use one of the workstations available in your Seneca computer lab.

MyApps (AppsAnywhere) is an application streaming service that lets you install software on any Seneca PC on demand. Any software application on the MyApps menu can be used on computers in classrooms, labs, and the Computing Commons.

Reference: https://inside.senecacollege.ca/its/software/myapps/

You will now use MyApps on your Windows workstation in your Seneca lab room to launch an application to allow you to connect and login to your Matrix server account.

Several SSH applications will appear. We will use the application called SSH Client for this practice tutorial.

Perform the Following Steps:

1. Start your workstation in your lab and login to your Seneca Windows account.
   
   
2. Make certain that the MyApps window is open. This window should have opened shortly after you logged into your Windows workstation. If the application windows is not open, click on the MyApps icon on the desktop to launch).
   
   
   

   SSH Client Application Window
3. Click on the Search Apps area located in the top right corner of the MyApps window and type the word: ssh
   
   
4. Several SSH applications will appear.
   
   NOTE: All of these applications allow you to connect to your Matrix account.
   We will use the application called SSH Secure Shell Client for this practice tutorial.
   
   
5. Double-click on the SSH Secure Shell Client application icon to launch this program.
   
   
   

   Quick Connect Dialog Box
6. The main SSH Client window will appear. Click on the Quick Connect button.
   
   NOTE: The Connect dialog box allows the user to specify the server name and your account name
   to allow you to connect to the server.
   
   
7. Click on the textbox labelled Hostnanme and enter the text: matrix
   
   NOTE: You can use the hostname matrix since you are located inside Seneca's network.
   If you where located outside Seneca's network, then you would need to enter the full domain name: matrix.senecac.on.ca
   
   
   

   Dialog Box to Share Public Key on Remote Server
8. When connecting securely for the first time, a dialog box will appear to share a "public key" with your Matrix account in order to make your interaction between your workstation and the remote Linux server secure within the network (i.e. encrypted to prevent unauthorized access by other users)
   
   FYI: To make communications over a network secure, a computer generates two keys: a private key that is kept on the computer, and a public key, which can be shared with other computers. Transmissions from your computer uses the private key to encrypt (scramble) transmission to the remote computer, which in turn, uses the public key to decrypt (unscramble) the transmission. Likewise, the remote computer uses the public key to encrypt (scramble) transmissions and your computer uses the private key to decrypt (unscramble) those transmissions.
   
   
   

   Password Dialog Box
9. Click the Yes button to share your public key.
   
   
10. Next, a dialog box will appear prompting you for your Matrix account password in order to gain entry to your Matrix account. Your Matrix password is identical to your Seneca password. As you type the password, the text will be blocked-out or hidden to prevent others from viewing the screen to obtain your password
    

    Authentication Response Dialog Box
    
    
    
11. Enter your password and click OK or press ENTER
    
    
12. Click OK or press ENTER at the second Authentication Response dialog box.
    
    
13. If you entered your password correctly, the main SSH Linux shell should appear where you enter Linux commands.
    
    NOTE: The Matrix server has been configured to allow users to only interact with the Linux OS by issuing commands. There are various reasons for this, but the main 2 reasons are to force students to learn how to issue Linux commands as well as limitations to remote access to a graphical Linux server due to large number of users (students).

Later in the course, your instructor may discuss other ways of accessing graphical versions of Linux, and how to launch a shell terminal.

Part 2: Access your Matrix Account From your own computer within or outside the Seneca College Network

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Perform the following steps:

1. Select from the installation menu: Install CentOS 7.
2. Next, you will be prompted for a language. In the first screen, select language English with subselection English-Canada and then click the Continue button on the bottom right-hand screen.

INVESTIGATION 2: USING THE LINUX SHELL

Linux Commands Used (click for online help): Logging Out of Linux Account logout , exit <ctrl><d>

Change Password passwd

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Perform the following steps:

1. Open Terminal.
2. Login as root: su -
3. Type: yum update
4. Follow the prompts.
5. If there is a kernel update, reboot your system. (There usually is on a first update after OS installation.)

INVESTIGATION 3: COMPLETING YOUR ONLINE ASSIGNMENTS

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Perform the Following Steps:

1. Study the Linux commands and their purpose to note computer software information for your installed c7hostVM. You should take time to issue each of these commands to view the output, and record this chart in your lab1 logbook.
   
   
2. Login to your c7hostVM, open a Bash Shell terminal, and login as root by issuing the command:
   su -
   
   
3. Make certain to record output from these commands (except for the ps -ef output) in your lab1 logbook.

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LINUX PRACTICE QUESTIONS

The purpose of this section is to obtain extra practice to help with your assignment #1, quizzes, your midterm, and your final ezam.

Here is a link to the MS Word Document of ALL of the questions displayed below but with extra room to answer on the document to simulate a quiz:

https://ict.senecacollege.ca/~murray.saul/uli101/uli101_week1_practice.docx

Your instructor may take-up these questions during class. It is up to the student to attend classes in order to obtain the answers to the following questions. Your instructor will NOT provide these answers in any other form (eg. e-mail, etc).

Review Questions:

1. What is a “Linux Cluster”? What is an advantage of using a Linux cluster?
2. List three unique server names at Seneca college and briefly explain the purpose of that server.
3. List the steps to connect and login to your Matrix Linux server account from a workstation on one of your labs at Seneca College.
4. List the steps to connect and login to your Matrix Seneca College account on your home computer.
5. List 3 unique ways to log out of your Matrix account (not including closing the SSH window or application).
6. List the steps to change your Matrix password.
7. What is the difference between a Linux command and an argument?
8. What character(s) can separation between commands and arguments?