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[[Category:OPS235]][[Category:OPS235 Labs]]
{{Admon/caution|THIS IS AN OLD VERSION OF THE LAB|'''This is an archived version. Do not use this in your OPS235 course.'''}}
= LAB PREPARATION =
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#Boot-up your '''centos1''' VM. '''when the Grub Boot menu appears''', press the letter <b><code><span style="color:#3366CC;font-size:1.2em;">e</span></code></b> (for "edit").
#Using your arrow keys, scroll to next screen to '''linux16linux''' or '''linux-efi''' command and type the word <b><code><span style="color:#3366CC;font-size:1.2em;">single</span></code></b> as an argument after '''quiet''' (see diagram for reference) and then press <b><code><span style="color:#3366CC;font-size:1.2em;">ctrl-x</span></code></b> to boot.
#The system should boot into text-based mode. Enter your '''root''' password.
#One thing to look at is partition space usage. Issue the command: <b><code><span style="color:#3366CC;font-size:1.2em;">df -h</span></code></b>
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[[Image:grub2_3.png|thumb|right|600px|Add '''rw init=/sysroot/bin/sh''' as shown, '''ENTER''' and then press '''bctrl-x''' to boot into single user no root password mode]]
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#The procedure to reset root's password is different than shown above. Press <b><code><span style="color:#3366CC;font-size:1.2em;">e</span></code></b> at the Grub boot menu.
#Using your arrow keys, move to '''linux16linux''' or '''linux-efi''' command and replace the argument '''ro''' with the argument <b><code><span style="color:#3366CC;font-size:1.2em;">rw init=/sysroot/bin/sh</span></code></b> (see diagram for reference) and then press <b><code><span style="color:#3366CC;font-size:1.2em;">ctrl-x</span></code></b> to boot.
#The system should boot into text-based mode without prompting for root's password.
#Issue the command: <b><code><span style="color:#3366CC;font-size:1.2em;">chroot /sysroot</span></code></b><br><br>
</ul>
</li>
<li>What does the'''z''' option do?</li>
<li>Compare the sizes of '''/tmp/archive1.tar.gz''' and '''/tmp/archive2.tgz'''. Why are they so close in size?</li>
</ol>
# Part is to be performed in your '''centos2''' VM.
# Issue the following command to install a basic set of development tools and libraries:<br /><b><code><span style="color:#3366CC;font-size:1.2em;">yum groupinstall "Development Tools" "Development Libraries"</span></code></b><br><br>
<ol>
# Place your Centos7 Full Install DVD into the DVD drive of your hostmachine.
# View the contents of the DVD drive using the file manager application (called '''nautilus'''). Change to the Packages subdirectory. What does this subdirectory contain?
# Use a graphical file manager to view the contents of the DVD in your machine.<br><br>'''TIP:''' If you are having problems locating pathname to your DVD, open a terminal, login as '''root''', issue the command: '''mount''', and look for a path-name containing your Centos Install DVD and use that path-name when required later in this section.<br><br>
# Open a shell terminal and use the Linux command '''cd''' to change to the '''Packages''' sub-directory (hint: similar path-name as USB, but use '''Centos 7 x86_64/Packages''' and use '''quotes''' " " around full path-name since there are spaces within the pathname).
<ol>
<li value="14">We will now look at how we can add different repositories to our '''c7host''' machine.</li><li>As root, issue the following command: <b><code><span style="color:#3366CC;font-size:1.3em;">yum repolist</span></code></b></li><li>Take a few moments to view the contents of the file. Do you see which repositories are used by the '''yum''' command? Write down the repositories in your lab logbook.</li><li>View the following link to see a general listing of repositories:<br>[ [http://wiki.centos.org/AdditionalResources/Repositories Available Repositories for Centos] ].</li><li>To add this repository, issue the command:<br><b><code><span style="color:#3366CC;font-size:1.3em;">wget https://dl.fedoraproject.org/pub/epel/7/x86_64/e/epel-release-7-56.noarch.rpm</span></code> </b><br>Or if you receive a error message, try the command: <br><b><code><span style="color:#3366CC;font-size:1.3em;">yum install epel-release</span></code></b></li><li>To enable the repository in yum, issue the following command:<br><b><code><span style="color:#3366CC;font-size:1.3em;">yum install epel-release-7-56.noarch.rpm</span></code></b></li><li>To clean-up the repository list (including downloading new applications in added repositories), issue the command: <b><code><span style="color:#3366CC;font-size:1.3em;">yum clean all</span></code></b></li><li>To verify that you have added the repository, you can issue the command: <b><code><span style="color:#3366CC;font-size:1.3em;">yum repolist</span></code></b></li><li>Unused and unneeded software can present a security risk and ties up disk space needlessly. Find '''at least 4 other packages''' to remove on your c7host machine(for example: '''sound & video''', '''games''', etc) that you're not using on your system. Be careful to ensure that removing those packages does not also remove other software that you do need.</li>
</ol>
'''Answer Investigation 3 observations / questions in your lab log book.'''
= INVESTIGATION 3: LOOKING AHEAD =
# packageInfo.bash<br>
# Purpose: Generates a report to displaying specified information of installed software<br>
#<br># USAGE: ./packageInfo.bash[application-name]<br>
#<br>
# Author: *** INSERT YOUR NAME ***<br>
<code style="color:#3366CC;font-family:courier;font-size:.9em;">
# Clear screen and use Here Document to display select on report items to read into variable<br>
clear<br>
cat <<+<br>
Available Package Information Items:<br>
<br>
cat <<+<br>
File "/root/package-info.txt" can has been created<br>
+<br>
</code>