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OPS235 Lab 6

59 bytes added, 15:07, 2 March 2020
LAB PREPARATION
=LAB PREPARATION=
[[Image:my-network.png|thumb|right|350px|Setting up networks is an essential operation for a system administrator. Maintaining network connectivity and securing the network are also essential operations. In this lab, we will '''configure a Virtual Private Network private virtual network using static IP addresses''' (eg. wired workstation connections). We will learn how to setup a DHCP network (eg. for notebook, table and smartphones) in lab 8.]]
===Purpose / Objectives of Lab 6===
In this lab, you will learn the basics of networking by using your '''Virtual Machines'''. You will first set up a '''virtual private network (VPN)''' among those machines. In addition, you will learn to set up '''network names''' (to associate with server's IP Addresses), '''associate network services with port numbers''' for troubleshooting purposes, and use shell scripts with arrays to store network configuration data.
<u>Main Objectives</u>
# Configure a private (virtual) network for your '''VMs''' and your '''c7host''' machine
# Configure network interfaces for your Virtual Machines using both '''graphical''' and '''command-line''' utilities.
# Use '''local hostname resolution''' to resolve simple server names with their corresponding IP Addresses
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=INVESTIGATION 1: CONFIGURING A VIRTUAL PRIVATE NETWORK (VPN)=
For the remainder of this course, we will focus on networking involving our VMs. This lab will focus on setting up a virtual private network ('''VPN'''), connecting our VMs and c7host machine to the VPNnetwork, and configuring our VPN private network to make more convenient to use, troubleshoot and protect. '''Lab 7''' will focus on configuring SSH and making access to the VPN private network more secure. Finally, '''lab 8''' will focus on configuring mobile (as well as wired devices) via DHCP to automatically assign an IP address.
There are several reasons for creating '''VPNs'''virtual networks. The main reason is to '''safely connect servers together''' (i.e. to safely limit but allow the sharing of information among computer network users). This allows for a secure connection of computers yet controlling access to and monitoring (protecting) access to permitted users (discussed later in '''lab7''').
If we are going to setup a private network, there are a number of steps to perform: First, '''define a new private network in the Virtual Manager application'''; and second, '''configure each of our VMs to connect to this new private network'''. In Part 1, we will be perform the first operation. In part 2, we will be performing the second operation for all VMS (graphical and command-line).
Before configuring our network, we want to '''turn off dynamic network configuration for our Virtual Machines''' by turning off the '''"default"''' virtual network. We will then define our virtual private network.
:'''Perform the following steps:'''
<li value="1">Let's start with our '''centos1 VM'''. Double-click on your '''centos1''' VM, but instead of running the VM, click on the '''view''' menu, and select: '''Details'''<br />(Note: the Virtual Machine window will appear - do not start virtual machine)</li>
<li>In the '''left pane''' of the Virtual Machine window, select '''NIC:''' and note that this NIC is on the "default" virtual network</li>
<li>Change it to '''Virtual Network network1: NAT''' (i.e. the VPN network that you just created) and click the '''Apply''' button.</li>
</ol>
</li>
# When finished, check your settings, and then click the '''Apply''' button.
# Open a terminal and issue the '''ifconfig''' command to confirm the IP ADDRESS settings change.
# Verify that '''centos1'''VM is now connected to the VPN private network by issuing the following command from your '''c7host''' machine:<br><b><code><span style="color:#3366CC;font-size:1.2em;">ping 192.168.235.11</span></code></b>
[[Image:network-scripts.png|thumb|right|250px|Although you can use the '''ifconfig''' command to temporarily create a static IP address connection to a network, you need to add the network settings in the '''/etc/sysconfig/network-scripts''' directory to automatically connect to the network upon Linux system boot-up.]]
 
=== Part 3: Configuring VM Network Setup via Command Line ('''centos3''' and '''centos2''') ===
</code>
<br><br>
<ol><li value="7">Give this shell script execute permissions and run this shell script.</li><li>You will need to determine the full pathname of the '''ifcfg-ens33''' file in the /etc/sysconfig/network-scripts directory to use as an argument for this shell script.</li><li>Run the shell script. What do you notice from the report that the shell script generated?</li><li>Then use wget command to download another variation of the network-info.bash shell script using the awk command to separate the variables and values into separate columns:<br><b><code><span style="color:#3366CC;font-size:1.2em;">https://ict.senecacollege.ca/~ops235/lab6labs/network-info-2.bash</span></code></b><br></li></ol>
# Switch to your '''c7host''' VM.
# Change to the '''/root/bin''' directory.
# Issue the Linux command: <b><code><span style="color:#3366CC;font-size:1.2em;">wget https://ict.senecacollege.ca/~ops235/lab6labs/lab6-check.bash</span></code></b>
# Give the '''lab6-check.bash''' file execute permissions (for the file owner).
# Run the shell script and if any warnings, make fixes and re-run shell script until you receive "congratulations" message.
[[Category:OPS235]]
[[Category:OPS235 Labs]]
[[Category:CentOS 7]]
[[Category:SSD2]]

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