This guide describes how to monitor disk space and get alerted when a disk reaches a threshold. Step 1: login to your server, edit file /opt/mistio-collectd/collectd.conf and add this at the end of the file:

MountPoint "/"
ValuesPercentage true

Save and exit. This will measure the root filesystem “/” , if you need to monitor another filesystem make sure you specify it there. Example

MountPoint "/opt"

To monitor /opt. You can also specify a Device, example /dev/xvdb1

Device "/dev/xvdb1"

Step 2: restart ClearGLASS collectd root@server:~# /opt/mistio-collectd/collectd.sh restart Step 3: Enter the page for the machine on ClearGLASS, select 'add graph', then 'df' –> 'root' –> then 'percent_bytes'. Choose 'free' and wait a few seconds until the graphs appear. Step 4: You can now set a rule to get alerted. Example if “df percent root free” < 10 then alert

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As soon as the disk gets filled with 90% we receive an alert email

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Instead of receiving an alert we could also add a command to run (eg rm some log files we know that get the disk filled)