Monitor disk space and get alerts
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:
Save and exit. This will measure the root filesystem “/” , if you need to monitor another filesystem make sure you specify it there. Example
To monitor /opt. You can also specify a Device, example /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
As soon as the disk gets filled with 90% we receive an alert email
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)