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=LAB PREPARATION=
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[[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.]]
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===Purpose / Objectives of Lab 5===
#Make certain you are logged in as '''root'''.
#Change to the '''/root/bin''' directory.
#Download the following shell script by issuing the following command: <br><b><code><span style=" pointer-events:none;cursor:default;color:#3366CC;font-size:1.2em;">wget httphttps://csict.senecacollege.ca/~ops235/lab5labs/monitor-disk-space.bash</span></code></b>
#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.
<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 default prompts would workand '''type w to write your changes'''!), restart your '''centos2''' VM and then '''format''' that partition for file type: '''ext4'''.</li>
<li>Now we'll make the new device a '''physical volume''', add it to the '''volume group''' by issuing the following commands:<br><b><code><span style="color:#3366CC;font-size:1.2em;">pvcreate /dev/vdb1</span></code></b> (enter '''y''' to proceed - ignore warning)<br><b><code><span style="color:#3366CC;font-size:1.2em;">vgextend centos_centos2 /dev/vdb1</span></code></b><br><br>'''NOTE:''' If you experience an error message, issue the '''ssm list''' command, and check the '''volume group name''' under the '''"pool"''' section.<br>If the volume group name is different than '''centos_centos2''', then use that volume group name for all remaining commands that use "centos_centos2"<br><br></li>
<li>Re-issue the '''ssm list''' command to see if there is any change.</li>
# Switch to your '''c7host''' machine.
# Open a shell terminal, '''su -''' into root, and change to the '''/root/bin''' directory., open a shell terminal
# Issue the Linux command: <b><code><span style="color:#3366CC;font-size:1.2em;">wget httphttps://csict.senecacollege.ca/~ops235/lab5labs/lab5-check.bash</span></code></b>
# 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.
[[Category:OPS235]]
[[Category:OPS235 Labs]]
[[Category:CentOS 7]]
[[Category:SSD2]]
