Collectd

  • Full man page for collectd with full descriptions and configs:
  • Collectd.conf(5)

How to install collectd

Ubuntu Systems

$ apt-get install collectd

FreeBSD Port

$ pkg_add -r collectd
To install the port (source package)
$ cd /usr/ports/net-mgmt/collectd
$ make clean install

How to configure collectd

  • Config lies in /etc/collectd/collectd.conf

Load Plugins

Plugins that Redbrick currently use

Plugin Name Type Description
CPU input Collects CPU usage
Memory input Collects memory usage
Interface input Collects traffic of network interfaces
Apache input Collects metrics about apache
write_http ouput Writes data to be scraped
df input How much of the disk/partition is free
disk input Usage of physical disks
interface input Gives the interface traffic in and out
load input Gives system load and utilisation
processes input Give processes running on a machine
users input Users loged on to a machine

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How configure the collectd apache plugin correctly

Configure that apache webserver

  • We need the plugin mod_status enabled
  • ExtendedStatus directive needs to be enabled
  • This goes in the apache config
ExtendedStatus on
<IfModule mod_status.c>
<Location /mod_status>
  SetHandler server-status
</Location>
</IfModule>
  • We also need to add this to the /etc/apache2/ports.conf
  • This may break things in /etc/apache2/sites-enabled/
# mod_status
NameVirtualHost 127.0.0.1
Listen 127.0.0.1:8081
Listen 127.0.0.1:80
  • In /etc/collectd/collectd.conf we need to configure the apache module as so
<Plugin apache>
    <Instance "Machine_Name">
        URL "http://localhost/server-status/?auto"
        Server "apache"
    </Instance>
</Plugin>

Trouble shooting apache

  • Try curl from the machine you are on
  • Try curl from the machine doing the scraping
  • If that works then looks like apache is working right