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This document will explain how to use poller.php to debug issues or manually running to process data.

Command options

    LibreNMS 2014.master Poller

-h <device id> | <device hostname wildcard>  Poll single device
-h odd                                       Poll odd numbered devices  (same as -i 2 -n 0)
-h even                                      Poll even numbered devices (same as -i 2 -n 1)
-h all                                       Poll all devices

-i <instances> -n <number>                   Poll as instance <number> of <instances>
                                             Instances start at 0. 0-3 for -n 4

Debugging and testing options:
-r                                           Do not create or update RRDs
-f                                           Do not insert data into InfluxDB
-d                                           Enable debugging output
-v                                           Enable verbose debugging output
-m                                           Specify module(s) to be run. Comma separate modules, submodules may be added with /

-h Use this to specify a device via either id or hostname (including wildcard using *). You can also specify odd and even. all will run poller against all devices.

-i This can be used to stagger the poller process.

-r This option will suppress the creation or update of RRD files.

-d Enables debugging output (verbose output but with most sensitive data masked) so that you can see what is happening during a poller run. This includes things like rrd updates, SQL queries and response from snmp.

-v Enables verbose debugging output with all data in tact.

-m This enables you to specify the module you want to run for poller.

Poller Wrapper

We have a script by Job Snijders. This script is currently the default.

If you need to debug the output of then you can add -d to the end of the command - it is NOT recommended to do this in cron.

Poller config

These are the default poller config items. You can globally disable a module by setting it to 0. If you just want to disable it for one device then you can do this within the WebUI Device -> Edit -> Modules.


lnms config:set poller_modules.unix-agent false
lnms config:set poller_modules.os true
lnms config:set poller_modules.ipmi true
lnms config:set poller_modules.sensors true
lnms config:set poller_modules.processors true
lnms config:set poller_modules.mempools true
lnms config:set true
lnms config:set poller_modules.netstats true
lnms config:set true
lnms config:set poller_modules.ucd-mib true
lnms config:set poller_modules.ipSystemStats true
lnms config:set poller_modules.ports true
lnms config:set poller_modules.nac false
lnms config:set poller_modules.bgp-peers true
lnms config:set poller_modules.junose-atm-vp false
lnms config:set poller_modules.printer-supplies false
lnms config:set poller_modules.ucd-diskio true
lnms config:set poller_modules.wireless true
lnms config:set poller_modules.ospf true
lnms config:set false
lnms config:set false
lnms config:set false
lnms config:set poller_modules.slas false
lnms config:set false
lnms config:set poller_modules.cipsec-tunnels false
lnms config:set false
lnms config:set false
lnms config:set false
lnms config:set false
lnms config:set false
lnms config:set false
lnms config:set false
lnms config:set poller_modules.netscaler-vsvr false
lnms config:set poller_modules.aruba-controller false
lnms config:set poller_modules.entity-physical true
lnms config:set poller_modules.entity-state false
lnms config:set poller_modules.applications true
lnms config:set poller_modules.availability true
lnms config:set poller_modules.stp true
lnms config:set poller_modules.ntp true
lnms config:set true
lnms config:set poller_modules.loadbalancers false
lnms config:set poller_modules.mef false
lnms config:set poller_modules.mef false

OS based Poller config

You can enable or disable modules for a specific OS by add corresponding line in config.php OS based settings have preference over global. Device based settings have preference over all others

Poller performance improvement can be achieved by deactivating all modules that are not supported by specific OS.

E.g. to deactivate spanning tree but activate unix-agent module for linux OS


lnms config:set os.linux.poller_modules.stp false
lnms config:set os.linux.poller_modules.unix-agent true

Poller modules

unix-agent: Enable the check_mk agent for external support for applications.

system: Provides information on some common items like uptime, sysDescr and sysContact.

os: Os detection. This module will pick up the OS of the device.

ipmi: Enables support for IPMI if login details have been provided for IPMI.

sensors: Sensor detection such as Temperature, Humidity, Voltages + More.

processors: Processor support for devices.

mempools: Memory detection support for devices.

storage: Storage detection for hard disks

netstats: Statistics for IP, TCP, UDP, ICMP and SNMP.

hr-mib: Host resource support.

ucd-mib: Support for CPU, Memory and Load.

ipSystemStats: IP statistics for device.

ports: This module will detect all ports on a device excluding ones configured to be ignored by config options.

xdsl: This module will collect more metrics for xdsl interfaces.

nac: Network Access Control (NAC) or 802.1X support.

bgp-peers: BGP detection and support.

junose-atm-vp: Juniper ATM support.

printer-supplies: Toner levels support.

ucd-diskio: Disk I/O support.

wifi: WiFi Support for those devices with support.

ospf: OSPF Support.

cisco-ipsec-flow-monitor: IPSec statistics support.

cisco-remote-access-monitor: Cisco remote access support.

cisco-cef: CEF detection and support.

slas: SLA detection and support.

cisco-mac-accounting: MAC Address account support.

cipsec-tunnels: IPSec tunnel support.

cisco-ace-loadbalancer: Cisco ACE Support.

cisco-ace-serverfarms: Cisco ACE Support.

netscaler-vsvr: Netscaler support.

aruba-controller: Aruba wireless controller support.

entity-physical: Module to pick up the devices hardware support.

applications: Device application support.

availability: Device Availability Calculation.

cisco-asa-firewall: Cisco ASA firewall support.


Here are some examples of running poller from within your install directory.

./poller.php -h localhost

./poller.php -h localhost -m ports


To provide debugging output you will need to run the poller process with the -d flag. You can do this either against all modules, single or multiple modules:

All Modules

./poller.php -h localhost -d

Single Module

./poller.php -h localhost -m ports -d

Multiple Modules

./poller.php -h localhost -m ports,entity-physical -d

Using -d shouldn't output much sensitive information, -v will so it is then advisable to sanitise the output before pasting it somewhere as the debug output will contain snmp details amongst other items including port descriptions.

The output will contain:

DB Updates

RRD Updates

SNMP Response