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OPS245 Lab 5

67 bytes removed, 18:04, 25 September 2021

→‎Part 2: Using crontab to Automatically Alert System Administrator of Low Hard Disk Space: - Using a python script instead of a bash one.

#Perform this section in your '''c7host''' machine

~~#Use <code>sudo -i</code> to get temporary '''root''' permissions.~~#Change to ~~the~~ your '''~~/root/~~bin''' directory.#Download the following shell script by issuing the following command: <code>wget https://ict.senecacollege.ca/~~~ops235~~ops245/labs/monitor-disk-space.~~bash~~py</code>#Try to understand what this ~~Bash Shell~~ script does (refer to man pages for the '''awk''' command), and then run the script ~~as root~~with elevated permissions.

#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.

#Issue the follow command: <code>sudo mail-u root</code> (if you get an error, install email by issuing the command: <code>yum install mailx</code> Check to see if there are any mail messages. If there are mail messages, they do not relate to this ~~shell~~ script execution. Remove all mail messages by typing d immediately followed by a mail message number range (eg. to remove all messages. For example, if there are 5 messages, type '''d1-5''' and then press '''ENTER''' and enter '''q''' to exit the mail application).#Edit the '''monitor-disk-space.~~bash~~py''' ~~shell~~ script, and set the <code>ALERT=90</code> value to <code>ALERT=10</code>. Then save your editing session, and re-run this ~~shell~~ script.

#Run the '''mail''' command. Do you have a mail message? Enter the mail message number to view the message. If there is a message, what is the purpose of this message?

# Exit from the mail command.

<li value="11">Quickly view the tutorial about the [http://code.tutsplus.com/tutorials/scheduling-tasks-with-cron-jobs--net-8800 Using crontab] file to understand the purpose of this

file and how to basically set up a schedule to run a shell script.</li>

<li>Issue the following command to setup a crontab entry for root: <code>crontab -e</code></li><li>Enter the following line in order to run at 6:00 on the first day of every month: <code>0 6 1 * * /~~root~~home/<YOURUSERNAME>/bin/monitor-disk-space.~~bash~~ py #Runs first day of each month (6:00 am)</code> Note: Make sure you put your own username in that entry.</li><li>'''Save''' the crontab entry.</li><li>Confirm that the entry was properly saved by issuing the following command: <code>crontab -l</code></li></ol>

Peter.callaghan

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OPS245 Lab 5

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