{{Admon/caution|THIS IS AN OLD VERSION OF THE LAB|'''This is an archived version. Do not use this in your OPS235 course.'''}}

 '''In this lab, you will create three virtual machines'''. This also gives you an opportunity to experiment with different ways of installing CentOS. You will be learning the following elements of Virtualization in this lab:<br><br><u>Main Objectives</u> :* '''Installing Virtualization Software''' on your '''c7host ''' machine:* '''Create 3 separate VMs (virtual machines) using different installation methods:''':** Centos Live DVDInstallation:** Network Installation without configuration file:** Network Installation with configuration file (Kickstart)<br><br>:* Understand the '''advantages and disadvantages of each type of installation''', and be able to '''select the best installation method''' for a particular situation.:* '''Manipulate virtual machines by CLI''' (virsh):* '''Properly backup VMs and VM configuration''' in virtual manager application onto home directory and to external source (USB Key):* Observe how '''Bash Shell Scripting''' can be used to automate routine tasks involving VM management

A '''virtual machine''' is a software simulation of a computer which can be used as though it were actual hardware. It's possible to run multiple virtual machines on one computer, reducing hardware requirements and introducing promoting flexibilitywhen working with multiple operating systems. Some common uses of virtualization include:

|width="40%" |{{Admon/tip|Online Linux Command Review|The following links tutorial will allow you to practice Linux commands that you learned from ULI101learn essential shell scripting skills. Login to your '''Matrix''' account, and issue the pathname to run the online tutorial in Matrix:<br><ul> <li>Online vi Text Editor TutorialShell Scripting - Part 2 (Logic & Math Expressions): [ ]<br>'''/home/murray.saul/scripting-2'''</li><li>Bash Shell Scripting I: [ ]- Part 3 (Loops)<br>'''/home/murray.saul/scripting-3'''</li></ul>|

You will be learning to perform several different type of CENTOS Linux installs. Lab2 already has an empty table for comparing various Linux installs. You were required in lab1 to record your observation for your '''c7host ''' installation.

# Open a shell terminal.<br><br>'''WARNING:''' You must perform a '''yum update''' on your '''c7host''' machine before proceeding with the next steps.<br><br># You will need to download an image file for the Centos7 LIVE DVD by issuing the following command (best works while at Seneca):<br><b><code><span style="color:#3366CC;font-size:1.2em;">wget http://belmont.senecac.on.ca/centos/7/isos/x86_64/CentOS-7-x86_64-LiveGNOME-1511.iso</span></code></b><br><br># Install the virtualization software by issuing the command:<br><b><code><span style="color:#3366CC;font-size:1.2em;">yum install qemu-kvm qemu-img virt-manager libvirt libvirt-python \<br>python-virtinst libvirt-client virt-install virt-viewerbridge-utils</span></code></b> <br><br> {{Admon/important|Restart your Host Machine|You must restart your '''c7host''' machine after installing the virtualization program above. If you fail to do this, you may experience virtualization network problems!}} 

:::* A graphical tool for managing virtual machines ('''virt-manager''') and the '''virsh''' command-line tool.<br><br>

<li value="35">Start the virtualization service: <b><code><span style="color:#3366CC;font-size:1.2em;">service libvirtd start</span></code></b></li> <li>The firewall configuration is altered by the addition of the virtualization software. Restart Centos7 uses firewalld for firewall, but we will be switching back to using iptables. Issue the following series of command to install iptables and restart the firewall so that these changes become active: <br><br> <b><code><span style="color:#3366CC;font-size:1.2em;">systemctl stop firewalld</span></code></b><br><b><code><span style="color:#3366CC;font-size:1.2em;">systemctl mask firewalld</span></code></b><br><b><code><span style="color:#3366CC;font-size:1.2em;">yum install iptables-services</span></code></b><br><b><code><span style="color:#3366CC;font-size:1.2em;">systemctl enable iptables</span></code></b><br><b><code><span style="color:#3366CC;font-size:1.2em;">systemctl start iptables</span></code></b><br><b><code><span style="color:#3366CC;font-size:1.2em;">service iptables restartsave</span></code></b><br><br></li>

<li value="57">Start the graphical tool by selecting the menu options '''Applications'''>'''System Tools'''>'''Virtual Machine Manager''' or by typing the command<b><code><span style="color:#3366CC;font-size:1.2em;"> virt-manager</span></code></b></li>

== Part 1: Installing from a Live Disc Downloaded Image (Centos7 LIVE CD) =={| width="40%" align="right" cellpadding="10"|- valign="top"|{{Admon/tip|Perform Downloads and Network installs at Seneca|'''It is recommended to perform this lab in one of Seneca College's labs'''. This lab uses servers which are on the Seneca network and which are not available from other locations (such as your home). If you attempt this lab from another location, adjust the belmont.senecac.on.ca URLs to point to another mirror server -- note that you may need to change the directory name as well as the server name. The installation of the '''centos3''' virtual machine <u>must</u> be done at Seneca.}}|-|{{Admon/important|Removing and Recreating VMs|If for some reason the user wants to remove a Virtual Machine, they can right-click the VM, and select delete in the Virtual Machine Manager. It is recommended to '''"delete the image file" in the remove VM dialog box when removing and then recreating a VM'''. Note: If you fail to properly remove the VM image file, it may affect the hard disk size for the new VM (i.e. use the old smaller size. Make certain to remove that VM image file prior to recreating the VM.|'''}}|}

:: '''VM Name(and hostname):''' centos1:: '''Boot media:''' CentOS7 Live DVDLIVE CD Image:: '''Installation source:''' Live DVDDownloaded Centos7 LIVE CD image (http://belmont.senecac.on.ca/centos/7/isos/x86_64/CentOS-7-x86_64-LiveGNOME-1511.iso):: '''VM Image Pathname:''' /var/lib/libvirt/images/centos1.img:: '''Memory:''' 768MB2GB

{| width="40%" align="right" cellpadding="10"|- valign="top"|{{Admon/tip|Performing this Lab off # Make certain you used the Seneca network (eg. at home)|'''It is recommended wget command to perform this lab in one of Seneca College's labs'''. This lab uses servers which are on download the Seneca network and which are not available LiveGNOME iso file from other locations (such as your home). If you attempt this lab from another location, adjust the belmont.senecac.on.ca URLs to point to another mirror server -- note that you may need to change the directory name as well as the Belmont server name. The installation of the '''centos3''' virtual machine <u>must</u> be done at Seneca.}}|-|{{Admon/important|Removing and Recreating VMs|If for some reason the user wants to remove a Virtual Machine, they can right-click the VM, and select delete in the Virtual Machine Manager. It is recommended to '''"delete the image file" in the remove VM dialog box when removing and then recreating a VM'''. Note: If you fail to properly remove the VM image file, it may affect the hard disk size for the new VM (i.e. use the old smaller size. Make certain to remove that VM image file prior to recreating the VMfrom previous instructions).|'''}}|}

# '''Step 1 of 5:''' Enter the virtual machine (called Select '''centos1Local install media''') name and select click '''Local install mediaForward'''.# '''Step 2 of 5:''' Insert the DVD containing the Centos Live Disc image. Wait a moment for the disc to be recognized, then select Select '''Use CDROM or DVDISO Image''' as the install media. Set , click the ''OS type'Browse' to ''button, and then the 'Linux''Browse Local' and the ''Version'' button. Navigate to the location of the downloaded Centos7 LIVE CD image, select the image file and click '''Red Hat Enterprise Linux 7Open''' (the CentOS6 equivalent). When finished, click Forward to proceed.# '''Step 3 of 5:''' Set the memory to '''768 2048 MB''' and the number of CPUs to '''1'''# [[Image:vm-path.png|thumb|right|300px|It is extremely important to '''correctly specify the VM image file path-name'''. Double-check the spelling of the path-name before proceeding!]]<ol><li value="7">'''Step 4 of 5:''' This next step creates a disk file that will be used to simulate the virtual machine's disk drive. Select a size of '''10 GB'''. Click on<br> '''Select managed or other existing storage''' and checkmark type the box labeled VM image file pathame:<br> '''/var/lib/libvirt/images/centos1.img'Allocate entire disk now'' (make certain that the pathname is correct) and then click '''Forward'''# to proceed.</li><li>'''Step 5 of 5:''' Review Enter the options that you have selected. virtual machine name: '''Make a note of the storage location.centos1''' If anything needs to be changed. Review the VM information, use the ''Back'' button to go back and edit it; otherwise, click '''Finish'''#.<br><br></li><li>'''The virtual machine will now start'''- start timing your installation and making notes for '''centos1''' virtual machine in the installation comparison chart in lab2 logbook. The virtual machine is running from the live disc at this point, and no software has been installed on the ''hard drive'' of the virtual machine. The point of a live disk is to allow you to test the distribution to see whether you like it without installing to the harddrive hard-drive first.#Click </li><li>Double-click '''Install to Hard Drive'''. The installation program, similar to the one used when installing CentOS in Lab 1, will appear. You will get a warning at one point during basically perform the same installation process that the disk "May contain data" or "may need to be re-initialized" -- operations for this is simply a warning that the virtual disk is completely blank, and it is safe to proceed with the installation.#During the installation process, when prompted VM including for a storage device'''Date & Time''', first select '''Specialized Storage DevicesNetwork & Hostname''', and then select the '''Virtio Block DeviceInstallation Destination''' option.#When prompted for Make certain to use the '''hostname, enter ''': '''<u>centos1</u>''', and when prompted as opposed to ''c7host'') for the timezone, select this installation. (with a few slight differences).</li><li>For '''Toronto - Eastern Time OntarioInstallation Destination'''#>When asked about storage, select the destination option: '''Use All SpaceI will configure partitioning'''. and then click '''Use the default values for all other fields.Done''' Notice . Make certain that the installer does not ask you what software should be installed; compare the installation time to the amount of time it took '''Partition Scheme''' is set to do your Lab 2 installation. Record this information in the '''table contained in Investigation 4LVM'''.#When the installation is complete, and then click on the link: '''rebootClick to Create Automatically''' button at the bottom right-hand corner of the screen.#Start the VM from its disk image'''Done'''. This can be done graphically by selecting the Virual machine name, and then clicking on Check to make certain that the root partition has file system type: '''Openext4''' button, .</li><li>Accept the changes and then click the '''playBegin Installation''' button when .<ol type="a"><li>You will be required to make selections very similar to what you did in lab1.</li><li>While the next screen appears system is installing, take a few minutes to record your observations (or by selecting Virtual Machineincluding slight differences with centos1 install as opposed to c7host install).</li><li>Run from When the installation process is complete, note the time required to install this system and record in the virtual machine menu)installation comparison chart of your lab2 logbook.<br><br></li></ol></li><li>Power-off your Centos7 LIVE system. </li><li>You will get should notice that the Centos7 boot menu appears. Either press ''Firstboot'ENTER' configuration questions during '' to start or wait for it to start automatically.</li><li>Finish the boot final steps in the setup process (asking like you did in lab1).</li><li>#You may want to create a user, set turn off the date and time, and ignore the kdump outscreen-of-memory warningsaver (like you did in Lab1): [http://zenit. Make certain that the VM has a network interface connection (isenecac.e. look at network applet on the top panel). Create a user with the same name as your Matrix accountca/wiki/index.php/OPS235_Lab_1_-_CentOS7#Login using the new user account.Customizing_Your_Account How to Turn-off Screen Saver (lab1)]</li></ol>

<li value="1513">Enable SSH access to your virtual machine with these commands (semi-colon allows commands to be run in sequence):<br /> <b><code><span style="color:#3366CC;font-size:1.2em;">service sshd start; chkconfig sshd on</span></code></b></li> <li>Find out the IP address of your virtual machineand the name of your Ethernet network adaptor: <b><code><span style="color:#3366CC;font-size:1.2em;">ifconfig eth0</span></code></b> </li> <li>Enter the following command on your virtual machine to create a firewall exception to allow ssh traffic into the machine:<br /> <b><code><span style="color:#3366CC;font-size:1.2em;">iptables -I INPUT -p tcp -s0/0 -d0/0 --dport 22 -j ACCEPT</span></code></b></li> <li>If you are logged in as root, logout to your regular user account.</li><li>Confirm that you can ssh to your virtual machine from the host (your main CentOS installation): <b><code><span style="color:#3366CC;font-size:1.2em;">ssh c7host_IPaddressregularuserid@IPaddress</span></code></b> (where c7host_IPaddress '''regularuserid''' is your regular user login id, and '''IPaddress''' is the dotted-quad address '''IP_ADDRESS''' of your c7host machine'''centos1''' VM!).</li><li>Make certain to '''disable SELinux for centos1''' (refer to lab1)</li><li>Adjust your screen-saver settings and run a '''yum update''' on your centos1 VM before proceeding to ''Part 2''</li></ol> 

== Part 2: Installing from the a Network =={| width="40%" align="right" cellpadding="10"|- valign="top"|colspan="2"|{{Admon/important|Authenticate to the network|The rest of this lab uses network access.''' Be sure to authenticate to the network using your browser before proceeding'''.}}|}

:: '''VM Name(and hostname):''' centos2

:: '''Installation sourceURL:''' http://belmont.senecac.on.ca/centos/7/os/x86_64/:: '''VM Image Pathname:''' /var/lib/libvirt/images/centos2.img:: '''Memory:''' 1024MB2048MB

{| width="40%" align="right" cellpadding="10"|- valign="top"|colspan="2"|{{Admon/important|Authenticate to the network|The rest of this lab uses network access.''' Be sure to authenticate to the network using your browser before proceeding'''.}}|}# Create the VM (called '''centos2''') as you did with the ''centos1c7host'' virtual machine, except select network installation for the following differences:<br><br><ol type="a"><li>Select '''Network Installation''' using the installation source url URL displayed above.# Observe </li><li>When customizing your partitions, do the same operation that you did in centos1, but after automatically creating the partitions, reduce the size of the boot process. How is it different from booting from root LVM partition to '''8000 MB''' and add an optical disc LVM partition with a size of '''2000 MB''' (DVD)?# Start the installation process (make certain to use information in the mount point: '''/home'VM Details'' section above).# When you get to the disk partitioning step, select name: '''Use All Spacehome''' , and enable the checkbox labelled make certain root and /home partitions have '''Review and modify partition layoutext4'''file system). If an dialog box displays </li><li>Don't forget to install the GNOME desktop here as you will need a permissions problemGUI for Centos2<br><br></li></ol># Complete the installation. Login to your regular user account, then click yes and perform a yum update for the centos2 VM (reboot if required). Make certain to proceedadjust your screen-saver settings if desired. On the next screen, change the logical volumes as follows:#* Reduce Repeat the size of the root LV steps as you did to '''8000 MBstart the SSH service'''.#* , '''Add a <u>logical volume</u> with a size of 2000 MB and a mountpoint of /homeset iptables to accept connections via ssh''' (you can name it whatever you want, and use '''ext4test connections between centos2 and c7host''' as the file-system type).# On the software selection screen, select and '''Desktopdisable SELinux'''(refer to lab1).# Complete the installation. Record the time taken to install, and compare this to the time taken by the previous installations. Record your findings in the Installation Comparison chart in lab2 logbook.

== Part 3: Installing from the a Network using a Kickstart File ==

:: '''VM Name(and hostname):''' centos3

:: '''Installation sourceURL:''' http://belmont.senecac.on.ca/centos/7/os/x86_64/:: '''Kickstart locationFile URL:''' http://matrix.senecac.on.ca/~andrew.smith/ops235/centos6centos7-kickstart-v01.cfg:: '''VM Image Pathname:''' /var/lib/libvirt/images/centos3.img:: '''Memory:''' 1024MB2048MB

# Observe the installation. How is it different from booting from an optical disca downloaded image?# Complete the installation. Record the time taken to install, and compare this to the time taken by the previous installations.<br><br>If the during the installation, you see the message at the bottom '''Pane is Dead''', click the '''Virtual Machine''' menu at the top, select '''Shut Down''' -> '''Force Off''', '''right-click''' on '''centos3''' in the ''virtual manager'' window and select '''Delete'''. Redo the VM setup for a new instance of the ''centos3'' VM.

# Take a look at the kickstart file (eg. view url in a webj-browser) to determine the root password as well as the name and password for the first user account.!

 # Repeat the steps as you did to '''Answer start the Investigation 1 observations / questions in your lab log book.SSH service''', '''set iptables to accept connections via ssh''', '''test connections between centos3 and c7host''', and '''disable SELinux'''(refer to lab1). == Part 4: Updating the VMs ==   {| width="40%" align="right" cellpadding="10"|# Remember that centos3 is text- valign="top"|colspan="2"|{{Admon/caution|Never Shutdown Computer During Upgrade|Your computer based interface only (hostno graphics). To recover from a blank screen, vmspress a key (like the SPACE key) are at their most vulnerable when you perform an update. Always plan ahead for appropriate time prior to performing an updatereturn to the screen display. Shutting down your computer while performing an update may cause your computer not to boot! You have been warned!!!}}|}# In each VMRecord the time taken to install, run and compare this command: <b><code><span style="color:#3366CC;font-size:1to the time taken by the previous installations.2em;">yum update</span></code></b># Record your findings in the answers to these questions Installation Comparison chart in your log book:#* How long did it take to run on each VM? How many packages were updated?#* Why does it take longer in some VMs than others?lab2 logbook.

# Start the '''centos1''' virtual machine, and stop the '''centos2''' and '''centos3''' virtual machines.# Switch to the '''c7host ''' machine, and open a shell terminal.# Enter these admin commands into your '''c7host ''' machine and note the result:

<ol><li value="4">Now, shut-down your centos1 VM normally, and close the centos1 VM window.</li><li>Switch to your terminal and issue the command: <b><code><span style="color:#3366CC;font-size:1.2em;">virsh start centos1</span></code></b></li><li>Using the appropriate command check to see if your centos1 VM is now running.</li><li>There are other commands that can be used (such as '''suspend''', or '''shutdown'''). The "shutdown" command may not always work since it relies on the guest handling a particular ACPI event. Why do you think it is useful to have commands to manipulate VMs?</li><li>Since this is a text-based version of Linux, you do not need to turn off the screen-saver.</li></ol>

# Change to the directory <b><code>/var/lib/libvirt/images/</code></b>. Note the size of the files in this directory. What do these files contain?# Make a compressed backup of the <code>'''centos3.img</code> ''' file to your home directory with this command: <b><code><span style="color:#3366CC;font-size:1.2em;">gzip < centos3.img > ~YourUserId/centos3.img.backup.gz</span></code></b><br />(Note: Make certain to use the redirection signs "<" and ">" properly in the command!)# Compare the size of the compressed and original files(hint: use '''ls -lh''').If file is very large (like 15GB), you didn't compress it and you need to remove that file and perform the previous step until you get it right!

# >Wreck <u>only</u> your centos3 system! Try this command inside the centos3 virtual machine:<b><code><span style="color:#3366CC;font-size:1.2em;">rm -rf /*</span></code></b>(ignore error messages).# Shut down the centos3 VM. If you tried to start the centos3 VM, it would not boot since all system files have been removed!</li>

# Create compressed backups of your other virtual machines(ie. '''centos1''' and '''centos2''').</li>

# Execute the following command: <b><code><span style="color:#3366CC;font-size:1.2em;">virsh dumpxml centos3 >centos3.xml</span></code></b># Examine the file <b><code><span style="color:#3366CC;font-size:1.2em;">centos3.xml</span></code></b>. What does it contain? What format is it in?<br><br># Make We will now learn how to download a compressed image file and xml configuration file and add it as a copy of VM to the virtual manager menu.# Issue the following commands:<ul><li><b><code><span style="color:#3366CC;font-size:1.2em;">centos3wget http://cs.xmlsenecac.on.ca/~murray.saul/ops235/practical1.img.gz</span></code></b> called <code/li>centos3a.xml</codeli>.# Edit the file <b><code><span style="color:#3366CC;font-size:1.2em;">centos3awget https://scs.senecac.on.ca/~murray.saul/ops235/practical1.xml</span></code></b>, making the following changes:<br><br></li></ul>::* Change the name (in <ol><li value="17">Copy these files to the file, not the file name) to '''centos3a/var/lib/libvirt/images'''::* Change at least one of directory and decompress the hexadecimal characters in the UUID. Do not change the length of the UUID. Valid hexadecimal characters are 0-9 and a-f.::image</li><li>Make certain your present working directory is:'''/var/lib/libvirt/images'''</li><li>Issue this the command: <b><code><span style="color:#3366CC;font-size:1.2em;">virsh define centos3apractical1.xml</span></code></b>:::Issue the command <b/li><codeli><span style="colorWhat happened in the virtual manager window? To remove a VM entry in the Virtual Manager window, simply issue the command:#3366CC;font-size:1'''virsh undefine vm_name''' (without the '''.2em;">virsh list --allxml''' file extension)</spanli></codeli>Launch the VM to see if it boots-up</bli> and record any changes.:::Issue the command: <bli><code><span style="color:Can you log into this VM? Perhaps your instructor will give you a clue in week #3366CC;font-size:17...2em >;"p<br>virsh undefine centos3a</spanbr></codeli></bol>

<li value="1722">List all of the virtual machines again, and note any changes. </li> <li>For the remainder of these labs, it is assumed that you will backup <u>'''both'''</u> the images and xml configuration files for <u>'''all'''</u> Virtual machines, when asked to backup your virtual machines. It is also highly recommended to backup these files to an external storage device (eg. USB key) in case the host machine gets "wiped" and you need to rebuild your HOST machine and then restore your Virtual Machines...</li>

{{Admon/tip|Bash Shell Scripting Tips:|<br><ul><li>'''Data Input:'''<br><br>A shell script can obtain data from a number of methods: '''reading input files''', using '''arguments when issuing command''' (positional parameters), or '''prompting for data to store in a variable'''. The later method can be accomplished by using the '''read''' command, for example: '''read -p "Enter your name: " userName'''.<br><br></li><li>'''Mathematical Expressions:'''<br><br>In shell scripting, data is stored in variable as text, not other data types (ints, floats, chars, etc) like in compiled programs like C or Java. In order to have a shell script perform '''mathematical operations''', number or variable need to be surrounded by two sets of parenthesis '''((..))''' in order to convert a number stored as text to a binary number.<br><br><u>'''Examples'''</u><br><br>''var1&#61;5;var2&#61;10''<br>''echo "$var1 + $var2 &#61; $((var1+var2))"''<br><br>'''Note:''' shell does not perform floating point calculations (like '''5/10'''). Instead, other commands like '''awk''' or '''bc''' would be required for floating point calculations (decimals)<br><br></li><li>'''Loops (iteration):'''<br><br>Loops and logic are a very important elements of shell scripting (not to mention programming as well). Determinant loops (such as '''for''' loops) usually repeat for a preset number of times (eg. counts, positional parameters stored). In-determinant loops (such as '''while''' or '''until''' loops) may repeat based on unknown conditions (like waiting for user to enter correct data). Test conditions can be used with in-determinant loops, or even commands! If a command runs successfully (eg ls, cd, grep matching a pattern), zero (true) value is returned, otherwise a non-zero (false) value is returned. Command options or redirection to /'''dev/null''' can be used to just test if command runs, but not display stdout or stderr. Conditional statements "and" (&amp;&amp;) / "or" (&#124;&#124;) can also be used when testing multiple conditions.<br><br>'''<u>Examples (try in a shell script)</u>'''<br><br>''set ops235 is fun''<br>''for x''<br>''do''<br>&nbsp;''echo "argument is $x"''<br>''done''<br><br>''for x in $(ls)''<br>''do''<br> &nbsp;''echo "Filename: $x"''<br>''done''<br><br>''read -p "enter a whole number: " num''<br>''until echo $num &#124; grep -q "^[0-9][0-9]*$"''<br>''do''<br> &nbsp;''read -p "Incorrect. Please enter WHOLE NUMBER: " num''<br>''done''<br><br>''read -p "pick a number between 1 and 10: " num''<br>''while [ $num -lt 1 ] &#124;&#124; [ $num -gt 10 ]<br>''do''<br> &nbsp;''read -p "Incorrect. Please pick number between 1 and 10: " num''<br>''done''<br><br></li></ul>}}

We continue the discussion of using Bash Shell Scripts to help automate routine tasks if [ "$answer" = "y" ] # Backup all VMs if answer is yes<br>then<br>&nbsp;for num in 1 2 3 # Determinant loop for the Linux system administrator3 arguments: 1, 2, and 3<br>&nbsp;do<br>&nbsp;&nbsp;echo "Backing up VM #$num"<br>&nbsp;&nbsp;gzip < /var/lib/libvirt/images/centos$num. In lab1, you were exposed to img > /root/centos$num.img.backup.gz<br><br>&nbsp;&nbsp;echo "VM #$num BACKUP DONE"<br>&nbsp;done<br><br>elif [ "$answer" = "n" ]<br>then<br>&nbsp;read -p "Which VM should be backed up? (1/2/3): " numanswer<br>&nbsp;until downloading and running Bash Shell Scripts echo $numanswer | grep "^[123]$" >> /dev/null # Look for demonstration purposesmatch of single digit: 1,2, or 3<br>&nbsp;do<br>&nbsp;&nbsp;read -p "Invalid Selection. Before showing you demos for this labSelect 1, 2, you should learn a few more or 3: " numanswer<br>&nbsp;done<br>&nbsp;echo "Backing up VM #$numanswer"<br>&nbsp;gzip < /var/lib/libvirt/images/centos$numanswer.img > /root/centos$numanswer.img.backup.gz<br><br>&nbsp;echo "VM #$numanswer BACKUP DONE"shell scripting tricks:<br>else<br>&nbsp;echo " in case you need to create your own set of tools for task automationInvalid Selection...Aborting program"<br>&nbsp;exit 2<br>fi

[[Image:lab1_signoff.png{{Admon/important|thumbTime for a new backup!|right|500px|Students should be prepared with a'''ll required commands (system information) displayed in If you have successfully completed this lab, make a terminal (or multiple terminals) prior to calling the instructor for signoff'''.]]'''Arrange evidence for each new backup of these items on your screen, then ask virtual machines as well as your instructor to review them and sign off on the lab's completion:'''host machine.}}

::<span style="color:green;font-size:1.5em;">&#x2713;</span> Three working virtual machines created.::<span style="color:green;font-size:1.5em;">&#x2713;</span> Disk layout and size correct '''Arrange proof of the following on all virtual machines::<span style="color:green;font-size:1.5em;">&#x2713;</span> Use virsh to list the status of all vms.::<span style="color:green;font-size:1.5em;">&#x2713;</span> All virtual machines fully updated.::<span style="color:green;font-size:1.5em;">&#x2713;</span> All virtual machines backed up to a usb stick.::<span style="color:green;font-size:1.5em;">&#x2713;</span> Installation comparison table filled in.::<span style="color:green;font-sizescreen:1.5em;">&#x2713;</span> Lab Logbook (lab2) notes filled-in.'''

<ol><li><span style= Preparing for "color:green;font-size:1.5em;">&#x2713;</span> '''<u>All</u> VMs''':<blockquote><ul><li>Working virtual machines '''created''' and '''running'''</li><li>'''Disk layout''' and '''size''' correct on all virtual machines</li><li> Proof of '''yum updates'''</li><li>'''All virtual machines backed-up''' (eg. usb stick and/or home directory)</li></ul></blockquote></li><li><span style="color:green;font-size:1.5em;">&#x2713;</span>'''c7host''' machine:<blockquote><ul><li>'''Correct VM image filenames''' contained in '''/var/lib/libvirt/images directory'''</li><li>Creation of your bash shell script called '''backupVM.bash'''</li><li>A list of your '''iptables''' rules (command: '''iptables -L''')</li></ul></blockquote></li><li><span style="color:green;font-size:1.5em;">&#x2713;</span> Lab2 logbook notes and '''Installation Comparison chart''' completed</li></ol> == Practice For Quizzes , Tests, Midterm &amp; Final Exam ==

# Which factors recorded in your table (above) were due to What is the type name of the file created by the CentOS installation performed, and which factors were due to the amount of software installedprogram?

# What is the purpose of procedure to backup your VM images (and relationship between these pieces of softwareXML config files) to your USB key?#* libvirt#* libvirtd#* virsh#* virt-manager#* virt-install#* kvm