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OPS235 Lab 5 - CentOS6

528 bytes removed, 21:40, 7 January 2014
Investigation 4: How do we Manage Runlevels?
===Investigation 4: How do we Manage Runlevels?===
{{Admon/note|Use fedora2centos2 and centos3|Perform these steps in the '''fedora2''' both of these virtual machinemachines.}} The runlevel command is now deprecated in Fedora, and will likely be deprecated in RHEL/CentOS at some point as well, but for now this is what the industry is using.
The runlevel command is now deprecated in Fedora, and has been replaced by '''systemctl'''. The newer system called '''systemd''' is a newer method to help simplify controlling both runlevels (referred to as "targets" and system services (referred to as "services"). Refer to the tutorial [[init vs systemd]] for systemctl command usages and reference.
<ol>
<li>Issue the following Linux command:
<ul>
<li><code>systemctl list-units --type=targetrunlevel</code></li>
</ul>
</li>
<li>Note the target labelled graphicaldifference in output between centos2 and centos3. Now trace the chain of links starting at /etc/systemd/system/default.target - what's it ultimately pointing to?</li> <li>Issue You can use the following commands init command to switch change the default mode (also known as target, formerly current runlevel). See a list of runlevels [https: <ul> <li><code>rm /etc/systemd/system/defaultwww.centos.target<org/code><docs/li> <li><code>ln -s 5/libhtml/systemd5.2/systemInstallation_Guide/multis2-userinit-boot-shutdown-rl.target /etc/systemd/system/defaulthtml here].target</code></li> </ul> <li>Restart your fedora2 VMChange the current runlevel in centos2 to 3. What happened? What happensafter your reboot?</li> <li>Log into your regular user accountChange the default runlevel on centos2 to 3.What happens now after you reboot?</li>
<li>Issue the following Linux command:
<ul>
<li>What happens?</li>
<li>Log-off your graphical system. You should return to your shell prompt.</li>
<li>Issue Change the following commands: <ul> <li><code>rm /etc/systemd/system/defaultrunlevel for centos2 back to 5 and reboot to make sure it works.target</code></li> <li><code>ln -s /lib/systemd/system/graphical.target /etc/systemd/system/default.target</code></li> </ul> </li> <li>Reboot your fedora2 VM. What Happens?</li>
</ol>

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