dsc

Table of Contents

1. Overview
2. Module Description - What the module does and why it is useful
3. Setup - The basics of getting started with dsc
   • What dsc affects
   • Setup requirements
   • Beginning with dsc
4. Usage - Configuration options and additional functionality
5. Reference - An under-the-hood peek at what the module is doing and how
6. Limitations - OS compatibility, etc.
7. Development - Guide for contributing to the module

Overview

Installs and manages the DNS-OARC DNS Statistics Collector (dsc).

Module Description

With a default configueration the module will configuer dsc to listen on all real interfaces collecting statistics on an traffic it sees. It currently uses a Hardcoded set of datatypes.

Setup

What dsc affects

• Installs the dsc collector package
• creates the data collection directories
• remove the init.d script installed by the package and installs an upstart script (rc.d script on freebsd)
• installs our own version of the upload_prep script.
• remove the cron job installed b y the package and install our own
• manages the dsc-collector service

Setup Requirements OPTIONAL

• stdlib 4.11.0
• This module uses flock to manage cron jobs and assumes it is already installed on the system.

Beginning with dsc

Simply add the dsc module to your manifest

class { '::dsc': }

Usage

Local addresses

DSC needs to know the local IP addresses so that it can work out the direction packets are traveling. By default the module uses the $::ipaddress fact however you will often need to override this with a list of address. These addresses are also used to create the bpf_program filter if it is enabled.

class {'::dsc': 
  ip_addresses => ['192.0.2.1'],
  bpf_program => true,
}

Interfaces

If you want to configure dsc to listen on a specific set of interfaces then pass them as an array

class { '::dsc': 
    listen_interfaces => ['eth0', 'eth1']
}

Reference

Classes

Public Classes:

• dsc

Private Classes:

• dsc::params

Parameters (all optional)

• prefix (Path, Default: /usr/local/dsc): The base path for the run_dir
• ip_addresses (Array, Default: [$::ipaddress]): Specifies the DNS server's local IP addresses. It is used to determine the direction of an IP packet: sending, receiving, or other.
• bpf_program (Bool, Default: false): if true create a bfp filter to only capture data destined to the addresses listed in ip_addresses
• listen_interfaces (Array, Default: split($::interfaces, ',')): An array of interface that dsc should listen on. It will ignore interfaces starting with lo or dummy. By default it will use the interfaces listed in the $::interfaces fact.
• custom_dataset (Array, Default: []): An array of additional datasets that dsc should use. By default it will use generate the default dsc datasets only.
• package (String, Default: OS specific): The name of the package to install
• conf_file (Path, Default: OS specific): The location of the configueration file to manage
• service (String, Default: OS specific): The name of the service to manage
• pid_file (Path, Default: /var/run/dsc-statistics-collector/default/dsc.pid): The location of the pid file
• max_memory (Int, Default: 4194304): The upstart job limits the rss that dsc can used to this value. Once this value has been reached dsc will segfault and upstart will restart it
• presenter (/^(dsp|hedgehog)$/, Default: 'dsp'): This is not intended to be used to support multible presenters. it is somewhat cosmetic at the moment

Limitations

This module was developed to work with the hedgehog presenter and has not been tested with DSP.

Tested and working on FreeBSD 10, Ubuntu 14.04 and Ubuntu 16.04

Development

Since your module is awesome, other users will want to play with it. Let them know what the ground rules for contributing are.