<li value="12">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;">more /etc/yum.confrepolist</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>Before adding a repository to the yum.conf file, you need to see which repositories you want to add, and obtain the appropriate URL for those repositories. View the following link to see a general listing of repositories:<br>[ [http://wiki.centos.org/AdditionalResources/Repositories Available Repositories for Centos] ].</li><li>After viewing the repository list, why should you be cautious with adding just any repository into your yum.conf file?</li><li>Obtain the URL for the repository: '''SerNet Samba Repository'''. You will use in the next command (see below).</li><li>To add the repository, issue the command: <b><code><span style="color:#3366CC;font-size:1.3em;">yum-config-manager --add-repo URL_of_SerNET_Samba_Repository</span></code></b></li><li>To enable the repository in yum, issue the following command: <b><code><span style="color:#3366CC;font-size:1.3em;">yum-config-manager --enable repository_name</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>Now use the yum command to install the package called "x". Were you successful, and if so, why?</li><li>Perform a NetSearch to compare compiling source code vs using the yum command. What are the three major features that the '''yum''' command has that '''compiling source code''' doesn't?</li><li>Unused and unneeded software can present a security risk and ties up disk space needlessly. Find at least 4 other packages (for example: '''sound & video''', '''games''', etc) that you're not using on your system, and remove them. Be careful to ensure that removing those packages does not also remove other software that you do need.</li>