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How to monitoring Linux server disk usage and firing email when low

df command
df command

To simply monitoring your Linux server disk usage, we'll need to collect a small piece of information, the disk usage percentage, then check the threshold, and so firing alert email when finding it as low.

Get the disk usage percentage:

when running df -h disk filesystem command with human-readable -h parameter, we will get outputs like below.

[root@li560-107 ~]
# df -h
Filesystem      Size  Used Avail Use% Mounted on
devtmpfs        1.9G     0  1.9G   0% /dev
tmpfs           1.9G     0  1.9G   0% /dev/shm
tmpfs           1.9G  8.5M  1.9G   1% /run
tmpfs           1.9G     0  1.9G   0% /sys/fs/cgroup
/dev/sda         75G   42G   30G  59% /
tmpfs           374M     0  374M   0% /run/user/0

Now to get the usage percentage of the /dev/sda disk which is: 59% here in this example, we can run

[root@li560-107 ~]# df -h | sed -n 6p | awk '{print $5}'

OR running with sed 's/%//g' to skip % sign.

[root@li560-107 ~]# df / | grep / | awk '{ print $5}' | sed 's/%//g'

Write our simple bash script:

We can set our threshold value to 90% , and so write our simple bash script file with targeting email address
If you need help to setting up the Linux server main Email serveice you can check this article about basic Postfix settings .

CURRENT=$(df / | grep / | awk '{ print $5}' | sed 's/%//g')
if [ "$CURRENT" -gt "$THRESHOLD" ] ; then
    mail -s 'Hell, Server disk space alert' << EOF
Lookout the /dev/sda partition currently Used: $CURRENT% of available space.

Now we can run our simple monitoring bash script file daily by append @daily /path/to/file/ and gives the file +x permission.


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