collectd — lightweight and extensible daemon to collect system statistics, the periodic collection of indicators of system performance and individual applications.

To track the status of the system collectd collects metrics from various sources, is used as a standalone application gathering data in the background (collectd.service), in either client/server (master server and the node), making the collected data available on the network (data can be sent in encrypted form).

In client/server mode, the data accumulated on the client system be collected and periodically sent to a master server. An important feature of collectd is that not the server requests the data and the client is initiated by sending data to the server. The server manages data processing and plotting (third-party applications and/or scripts).

collectd only collects statistics and provides mechanisms to store the collected values in a variety of ways, such as creating graphs and storage graphs, you can use the format of RRD (*.rrd)using the tools RRDtool (high performance system for data collection and display).

collectd is very flexible, comes with hundreds of plugins, the functionality which provides support from the standard methods use to very complex and specialized, as well as for integration into other monitoring systems (e.g. Nagios). Parameters are specified in the configuration file (/etc/collectd.conf).

Are the plugins for monitoring various parameters such as CPU load, disk usage, data from the temperature sensors, the dynamics of growth of the log file, measuring throughput of the network and server responsiveness, load databases MySOL and Apache, changing content on websites, and more…

Due to the variable frequency of updating statistics (default 10 seconds) collectd will provide the required resolution enabling identification of even short-term and quickly disappearing anomaly supports monitoring of exceeded thresholds and send messages about them.

collectd does not provide tools to view and analyze the collected information, the use of third-party web interfaces and/or applications (e.g. kcollectd). The basic code of the daemon and the accompanying utilities (collectdmon, collectdctl, collectd-tg and collectd-nagios) written in C (si), plugins can be written in Perl (collectd-perl), C (si), Java and Python. There is extensive built in and online documentation.

License: GNU General Public License version 2.0 (GPLv2)

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