932
edits
Changes
→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
#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: <b><code><span style="color:#3366CC;font-size:1.2em;">sudo mail-u root</span></code></b> (if you get an error, install email by issuing the command:<br><b><code><span style="color:#3366CC;font-size:1.2em;">yum install mailx</span></code></b><br>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.bashpy''' shell script, and set the <b><code><span style="color:#3366CC;font-size:1.2em;">ALERT=90</span></code></b> value to <b><code><span style="color:#3366CC;font-size:1.2em;">ALERT=10</span></code></b>. 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 <b>[http://code.tutsplus.com/tutorials/scheduling-tasks-with-cron-jobs--net-8800 Using crontab]</b> 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:<br><b><code><span style=" pointer-events:none;cursor:default;color:#3366CC;font-size:1.2em;">crontab -e</span></code></b></li><li>Enter the following line in order to run at 6:00 on the first day of every month:<br><b><code><span style=" pointer-events:none;cursor:default;color:#3366CC;font-size:1.2em;">0 6 1 * * /roothome/<YOURUSERNAME>/bin/monitor-disk-space.bash py #Runs first day of each month (6:00 am)</span></code></b><br />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:<br><b><code><span style=" pointer-events:none;cursor:default;color:#3366CC;font-size:1.2em;">crontab -l</span></code></b></li></ol>
