#Monitor disk health linux how to#
#Monitor disk health linux install#

If you open the Amazon EC2 console, select a running Amazon EC2 instance, and select the Monitoring tab you can see Amazon CloudWatch metrics for that instance.

#Monitor disk health linux how to#

Now you can list the crontab entry using the following command.This post was written by Dean Suzuki, Solution Architect Manager.Ĭustomers who run Windows or Linux instances on AWS frequently ask, “How do I know if my disks are almost full?” or “How do I know if my application is using all the available memory and is paging to disk?” This blog helps answer these questions by walking you through how to set up monitoring to capture these internal performance metrics. */5 * * * * sh /home/ec2-user/disk-monitor.sh Note: Change the script path accordingly. crontab -eĪdd the following line to run the script every 5 minutes. You can open the crontab using the following command. The best way to automate the process is by adding the script to crontab entry. Running the script manually does not make any sense as we want to automate the process. To run the script, using the following command./disk-monitor.sh Automating The Monitoring Process

Now, change the execution permission of the script using the following command. To execute the script, copy the script content on to a file named disk-monitor.sh. Based on the result, an email will be sent to the specified id. Using the above variables the disk usage is equated with the threshold VALUE variable. Then it gets the filesystem name and disk usage percentage to two variables FILESYSTEM and DISK_USAGE. Using a for loop it will loop through all the filesystem which has “ /dev” mount point. SERVERNAME holds the hostname of the server for server identification in the email notification. VALUE holds the threshold you want to set.

The environment variable MAILID holds the email id in which the report has to be sent. The above script gets the memory information using “ df hP” command. #!/bin/bashįor line in $(df -hP | egrep '^/dev/' | awk '' | cut -d'%' -f1 )ĮMAIL='$SERVERNAME - $(date): $FILESYSTEM Exceeded the threshold VALUE 'ĮMAIL='$EMAIL Usage Details Current Usage:($DISK_USAGE%) Threshold value: ($VALUE%)'Įcho -e '$EMAIL' | $MAIL -s ''$SERVERNAME' Disk Usage Alert: Needs Attention!' '$MAILID'ĮMAIL='$EMAIL $FILESYSTEM ($DISK_USAGE%) is lessthan the threshold ($VALUE%)'Įcho -e '$EMAIL' | $MAIL -s ''$SERVERNAME' Disk Usage Alert: Threshold Not Reached' '$MAILID' The explanation for the script is given after the snippet.

#Monitor disk health linux install#

Otherwise, proceed to next step.įor Ubuntu/Debian sudo apt-get install mailutils Script to Test Disk Usageįollowing is the script that tests the disk usage and sends a report over to the mail id you specify. If you get the above error, install mail component using the following command and test the command again. While executing the above command, you might get the following error. echo 'This message will go into the body of the mail.' | mail -s 'Testing from the server.' (email id here)įor example, echo 'This message will go into the body of the mail.' | mail -s 'Testing from the server.' You can do this test by executing the following command. Let’s Implement Itįirst, you need to make sure that mail command is working on your server to get the notifications.

In this post, we have explained a shell script that monitors the disk usage at a regular interval you specify in the crontab and emails the report if it reaches the threshold you specify. In this case, it is better to write a script that automates the monitoring and sends reports to mail if it reaches the threshold. Many open source monitoring tools do the monitoring and can be integrated with various notification services.īut let’s say you are running a single server and you don’t have a monitoring solution in place. If you are running mission-critical applications on servers, it is important to monitor and notify the administrators about the disk usage.