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[[Category:OPS235]]
{{Admon/caution|Draft Lab|This lab has NOT been released for regular distribution. When the lab is ready to be released, this caution banner will disappear.}}
=Archiving Files, Compiling Software Packages from Source, Managing Services=
[[Category:OPS235]][[Category:OPS235 Labs]]
{{Admon/note|Use fedora2|Perform these steps in the '''fedora2''' virtual machine.}}
<ol>
<li value="3">Issue the following Linux command:
<ul>
<li><code>systemctl list-units --type=target</code></li>
</ul>
</li>
<li>Note the target labelled graphical. What does this indicate about your fedora2 VMNow trace the chain of links starting at /etc/systemd/system/default.target - what's it ultimately pointing to?</li> <li>Issue the following commands to switch the default mode (also known as target or , formerly runlevel):
<ul>
<li><code>rm /etc/systemd/system/default.target</code></li>
<li><code>ln -sf s /lib/systemd/system/multi-user.target /etc/systemd/system/default.target</code></li>
</ul>
<li>Restart your fedora2 VM. What happens?</li>
<ul>
<li><code>rm /etc/systemd/system/default.target</code></li>
<li><code>ln -sf s /lib/systemd/system/graphical.target /etc/systemd/system/default.target</code></li>
</ul>
</li>
'''Answer the Investigation 4 observations / questions in your lab log book.'''
===Investigation 5: How do we Manage System Services?===
{{Admon/note|Remain in your fedora2 VM|Perform these steps in the '''fedora2''' virtual machine.}}
We have seen that maintaining unneeded '''packages can be a security risk''' due to the unnecessary increase in the complexity of your system. Similarly, it is also unnecessarily hazardous, and even more so, to leave unneeded services running. In this investigation, we will learn how to '''control services, and turn off those services that we think are not necessary to help reduce security risks'''.}}
<ol>
<li value="3">Issue the following Linux command:
<ul>
<li><code>systemctl list-units --type=service</code></li>
</ul>
</li>
<li>Note the services that are currently running. Are there more services with this command as opposed to issuing the chkconfig command?</li> <li>Refer to the tutorial ([[init vs systemd]] ) to learn how to use the systemctl command to stop the service name called named '''udev.serviceiptables'''</li>
<li>Issue the systemctl command to verify that this service has stopped.</li>
<li>Issue If you reboot now - the iptables service will be turned back on. We don't want it on though, it causes students headaches. To turn it off permanently we need to disable the service. Refer to the tutorial ([[init vs systemd]] ) to learn how to use the systemctl command to start disable the service named '''udeviptables''' service, </li> <li>Reboot and verify confirm that this service is it's no longer running.</li>
</ol>
