Changes

=LAB PREPARATION=

{| width="40%" align="right" cellpadding="10"

[[Image:crontab.png|thumb|right|175px|Linux system administrators need to schedule Linux shell scripts and commands (via '''crontab''') to automatically run in order to be more productive.]]

|}

===Purpose / Objectives of Lab 5===

[http://man7.org/linux/man-pages/man8/pvdisplay.8.html pvdisplay]<br>

[http://man7.org/linux/man-pages/man8/lvdisplay.8.html lvdisplay]<br>

|style="padding-left:20px;" |LVM Management

[http://man7.org/linux/man-pages/man8/lvextend.8.html lvextend]<br>

[http://man7.org/linux/man-pages/man8/lvcreate.8.html lvcreate]<br>

[http://code.tutsplus.com/tutorials/scheduling-tasks-with-cron-jobs--net-8800 Using crontab]

|}

= INVESTIGATION 1: MONITORING HARD DISK SPACE =

#Make certain you are logged in as '''root'''.

#Change to the '''/root/bin''' directory.

#Try to understand what this Bash Shell script does (refer to man pages for the '''awk''' command), and then run the script as root.

#Give execute permissions and run this shell script. This script is supposed to notify the root user by email if there are any potential partition size issues.

'''Answer INVESTIGATION 1 observations / questions in your lab log book.'''

=INVESTIGATION 2: MANAGING HARD DISK SPACE USING LVM=

<ol><li value="21">Reduce the file-size by issuing the command: <b><code><span style="color:#3366CC;font-size:1.2em;">lvreduce -r -L -0.5G centos_centos2/archive</span></code></b></li>

<li>Issue the '''ssm list''' command to verify.</li>

<li>Issue the '''ssm list''' command to verify.</li>

</ol>

[[Image:Add_virtual_disk.png|thumb|right|400px|You can add virtual hard disks for a VM by changing to the Details section for the VM (as opposed to console), click Add Hardware, fill information in the Add New Virtual Hardware dialog box and clicking Finish.]]

|}

===Part 2: Adding Additional Virtual Hard Drives===

<li value="3">Record the size of the volume group and the amount of free space</li>

<li>At the top of your KVM window for '''centos2''', click the '''view''' menu and change view from '''Console''' to <u>'''Details'''</u>''' .</li>

<li>Click the '''VM''' menu again, and return to the '''console''' view to access your centos2 VM display.</li>

<li>Issue the command: <b><code><span style="color:#3366CC;font-size:1.2em;">ls /dev/vd*</span></code></b>, what has changed?</li>

<li>Use '''fdisk''' (''refer to how to use in Part 1'') to create a new single '''primary''' partition for '''/dev/vdb''' that fills the ''entire'' disk, save partition table (accepting defaults prompts would work), restart your '''centos2''' VM and then '''format''' that partition for file type: '''ext4'''.</li>

<li>Re-issue the '''ssm list''' command to see if there is any change.</li>

<li>Record the size of the volume group and the amount of free space. What has changed and what caused those changes?</li>

<li>Issue the '''ssm list''' command. Note that your home file-system is now 2GB bigger, and you have not even rebooted your machine since you used fdisk to create a partition!</li>

# Switch to your '''c7host''' machine.

# Open a shell terminal, '''su -''' into root, and change to the '''/root/bin''' directory., open a shell terminal

# Give the '''lab5-check.bash''' file execute permissions (for the file owner).

# Run the shell script and if any warnings, make fixes and re-run shell script until you receive "congratulations" message.

#Arrange proof of the following on the screen:<br><blockquote><span style="color:green;font-size:1.5em;">&#x2713;</span> '''centos2''' VM:<blockquote><ul><li>Output from '''ssm list''' command.</li><li>Proof that '''/archive''' has been mounted</li></ul></blockquote><span style="color:green;font-size:1.5em;">&#x2713;</span> '''c7host''' Machine:<blockquote><ul><li>Proof of creation of the shell script: '''monitor-disk-space.bash'''</li><li>Crontab entry for '''root''' account</li><li>Run the '''lab5-check.bash''' script in front of your instructor (must have all <b><code><span style="color:#66cc00;border:thin solid black;font-size:1.2em;">&nbsp;OK&nbsp;</span></code></b> messages)</li></ul></blockquote><span style="color:green;font-size:1.5em;">&#x2713;</span> '''Lab5''' log-book filled out.

= Practice For Quizzes, Tests, Midterm &amp; Final Exam =

[[Category:OPS235]]

[[Category:OPS235 Labs]]