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Overview

Collecting system metrics (e.g., CPU, memory, disk I/O, etc.) inside JVM usually shows incorrect result.
To obtain more precise monitoring result, control plane manager provides a way to collect system metrics from third-party monitoring server such as CollectD, ganglia, etc.
In this tutorial, we will show how to integrate third-party monitoring agent with ONOS to obtain system metrics. 

Usage

Each monitoring agent typically provides a way to report the collected metric to other system through various interfaces. 
As an example, we provide a CollectD plugin which is in charging of reporting all metric values to ONOS through REST API.
Inside ONOS we defined a set of REST API to receive the reported metrics from third-party monitoring agent.
The detailed REST API that is used for collecting system metrics is enumerated at the end of this document.

Prerequisites

Before you start, you will need followings:

  • Ubuntu 14.04 64-bit
  • 2GB or more RAM
  • 2 or more processors

CollectD Installation

Install CollectD using apt-get.

$ sudo apt-get update
$ sudo apt-get install collectd collectd-utils python-pycurl

Download CollectD plugin for reporting system metrics to ONOS.

$ sudo apt-get install git
$ git clone https://github.com/gunine/write_onos

Configure CollectD plugin by copying collectd.conf and modules directory under /etc/collectd/.

$ sudo cp collectd.conf /etc/collectd
$ sudo cp -R modules /etc/collectd

You may need to modify the collectd.conf file, if you have configured your own id and password to access the ONOS.

Finally, run CollectD service.

$ sudo /etc/init.d/collectd start

ONOS Installation and CPMan Activation

Install and run ONOS instance. The detailed procedures can be refer from here.

After ONOS has been initialized, we can activate CPMan application to receive system metrics from CollectD.

onos > app activate org.onosproject.cpman 

REST API for Collecting and Querying System Metrics

Collector

POST /collector/cpu_metricsCollects CPU metrics.
POST /collector/network_metricsCollects network I/O metrics include in/out-bound packets/bytes statistics.
POST /collector/disk_metricsCollects disk I/O metrics include read and write bytes.
POST /collector/system_infoCollects system information.
POST /collector/memory_metricsCollects memory metrics.

Control Metrics

GET /controlmetrics/memory_metricsList memory metrics of all network resources.
GET /controlmetrics/messagesList control message metrics of all devices.
GET /controlmetrics/messages/{deviceId}List control message metrics of a given device.
GET /controlmetrics/cpu_metricsList CPU metrics.
GET /controlmetrics/disk_metricsList disk metrics of all disk resources.
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