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[[Category:OPS235]]{{Admon/caution|Draft LabTHIS IS AN OLD VERSION OF THE LAB|'''This lab has NOT been released for regular distributionis an archived version. When the lab is ready to be released, Do not use this caution banner will disappearin your OPS235 course.'''}}
=Logical Volume Management and Software Package Management=
'''Perform the following steps:'''
(Perform investigations 1 - 3 in your host machine (c6host)
# Using information from the man page for <code>rpm</code>, fill in this information:
# Issue the following command: <code>rpm -e lynx</code>
# Issue an RPM query to verify that lynx is no longer installed. Record this command in your lab log-book.
'''Answer the Investigation 2 observations / questions in your lab log book.'''
::* Based on the result, do you think that cups is a useful package for your system? If not, try removing it.
<ol>
<li value="8">Unused and unneeded software can present a security risk and ties up disk space needlessly. Find at least 4 other packages (for example: games, sound & video, 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>
</ol>
Because we're using LVM though - we can avoid that. We can add a new harddrive (which will serve as a physical volume) to the volume group, and extend the root logical volume to make use of the new available space.
'''Perform the following operations to increase the size of lv_root in centos33centos3:'''
<u>'''<font>Steps:</font>'''</u>
<li>Click "Add Hardware" and add a new storage device of 2GBs, make sure it's a VirtIO disk.</li>
<li>Go back to the console view</li>
<li>Run the same ls command now(performed in step 1), what's changed?</li>
<li>Now we'll make the new device as a physical volume, add it to the volume group, and extend lv_root:</li>
<code>pvcreate /dev/vdb
vgextend vg_centos3 /dev/vdb
lvextend -l L +100%FREE 2G -r vg_centos3/lv_root</code>
<li>Now rerun the ls/pvs/vgs/lvs/df commands. What has changed and what caused those changes?</li>
<li>Among the changes, note that your root filesystem is now 2GB bigger - and you have not even rebooted your machine!</li>
'''Arrange evidence for each of these items on your screen, then ask your instructor to review them and sign off on the lab's completion:'''
# elinks installed application removed on the host (disk pack - main system c6host).
# Unnecessary/unused packages have been deleted (list at least 4, and show that they are no longer installed).
# Fresh backup of the virtual machines.
