How to Setup Slack Notifications for Low Disk Space On Your Server | 2021

You probably want to know when your server is running out of disk space. An easy solution is to configure the cron job to run daily and send a notification to Slack if there is a problem.

Get disk space with df command

Seeing disk space on Linux is the df -h (For output in human readable format):

It lists each mounted file system on how large the physical disk is, and how much is being used.

To limit the output to a specific file system (in this case, root) you can run df /. However, it returns the header row, so you can filter it grep:

Then, select the fifth column (percent) with awk, And remove the percent sign symbol sed. This gives you a command that shows how full your main disk is:

df / | grep / | awk '{ print $5}' | sed 's/%//g'

Which, in this case, will come back “39“. If you want to change the disk to be monitored by this command, you must first edit df Statement.

Configure command line slack notifications

The easiest way to make slack notifications work With webhook. Webhooks allow you to send notifications in the form of POST requests to URLs without having to manage bot users or OAuth. You can format messages as JSON and post them using curl.

Slack’s. From Api portal, Create a new app, select your workspace to add it and give it a name. It will appear when it sends you a message, so choose something interesting.

Once you get your app, find the “Incoming Webhooks” tab under “Add Features and Functionality”.

This will let you create a new webhook, and you have to choose which channel it should post on. You can create a new channel for bot notifications, or add it to your own DM.

Once you have the URL, copy the sample request to verify that it works. “Hello world!” Must see. In the channel you select. If so, it is good to go to Slack.

Put it all together

In order for your server to actually notify you, you will create a script that you a. Can run with daily cron work. Here is the script’s shell, minus the notification command:

CURRENT=$(df / | grep / | awk '{ print $5}' | sed 's/%//g')

if [ "$CURRENT" -gt "$THRESHOLD" ] ; then


This script sets two variables, CURRENT (For output of df Order from above) and THRESHOLD (For a value you can configure). It then checks if the current value exceeds the threshold, and runs a command if it is.

You can set the notification any way you want, but here is an example — the webhook URL is not included, which you will have to paste at the end (no additional flag is required):

curl -X POST -H 'Content-type: application/json' --data "{"text":"Your server `$(hostname)` is currently at ${CURRENT}% disk capacity."}"

This will send a well-formatted information to the specified channel of your webhook, including the server’s hostname and current disk capacity.

You can paste this command into if The above script statement, which brings the whole thing together:

CURRENT=$(df / | grep / | awk '{ print $5}' | sed 's/%//g')

if [ "$CURRENT" -gt "$THRESHOLD" ] ; then
curl -X POST -H 'Content-type: application/json' --data "{"text":"Your server `$(hostname)` is currently at ${CURRENT}% disk capacity."}"

Save as In your home directory, and make sure it has execution permissions chmod +x Open your crontab with crontab -e, And add the following line to the end:

0 * * * * ~/

This will run your script every hour to check if your disk is full. But you will get notifications only when it is full, so you can check whether the script works by setting THRESHOLD Below current disk usage and running it manually.

For more detailed information, you can send the result to the script df -h, Well formatted in a code box, just by updating curl Statement:

curl -X POST -H 'Content-type: application/json' --data "{"text":"Your server `$(hostname)` is currently at ${CURRENT}% disk capacity.n ```$(df -h)``` "}"

Which will look like this in Slack:

Since the command to run the script can be anything you want, you can also configure email notifications using postfix such as mail handlers or any other feed that supports webhooks.

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