ch 10 monitoring ncnu csie 97321012 林似真 stella. ncnu csie stella2010/6/82 ganglia

ch 10 Monitoring

NCNU CSIE 97321012 林似真 Stella

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ganglia

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[ gæ gl ] Kˈ ŋ ɪəK

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outline● WHY?● HOW?● WHAT?

● Ganglia● Distributed Monitorin

g System● Ganglia Architecture

– gmond– gmetad– web front-end

● Monitor Intersection● Ganglia Data Flow● Distribution and

Install● Example

● Reference● Q&A

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WHY?

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Why to Monitor?

● 系統狀態の監控● 解決系統の問題● 系統或應用程式の調校● 系統升級時の依據

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HOW?

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How to Monitor?

● 單一主機の監控● 分散式監控系統

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How to Monitor?

● 單一主機の監控● commands : top, free, uptime, ps● Log file● Shell scripts● MRTG● ...etc. 分散式監控系統

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How to Monitor?

● 分散式監控系統● Network utilization● CPU utilization● Hardware● System load● Disk utilization● ...etc.

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Ganglia?

● Nagios ←→ Ganglia● graph display → easy to see

● show host metrics● visualize trends

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WHAT?

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WHAT

IS

GANGLIA?

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Ganglia - Wiki

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Ganglia

● distributed monitoring system● monitor tool for clusters and grids● view live or historical statistics

● CPU load averages● network utilization

● long-term trends● graph display

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WHAT

IS

Distributed System

?

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Distributed Monitoring System

● Components : 1.daemons that reside on cluster nodes

2.server that collects clusters state information from nodes

3.GUI-based front-end, which provides system activity visulization

→ gmond

→ gmetad

→ web front-end

as for Ganglia components :

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Ganglia Architecture

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gmond

● Ganglia monitoring daemon● Multithreaded ● Responsibilities :

1.Monitor changes in host states

2.Announce relevant changes

3.Listen to the state of all the other ganglia nodes via a unicast or multicast channel

4.Answer requests for an XML description of the cluster state.

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gmetad

● Ganglia meta daemon● Aggregate data, information● steps :

1.Poll gmond, clusters, or other gmetad

2.Parse the collected XML

3.Save numeric metrics in RRD(round-robin database)

4.Export aggregated XML over TCP to clients

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web front-end

● web interface written in PHP● Graph generated by gmetad displays histor

ical information● highly dynamic

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monitor interaction

● Gmond runs on each cluster node; gmetad can fail over between nodes.

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● Distribution and Install

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example

● official website demo ● wikimedia demo

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Refernce

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Reference

● Ganglia HowTo ● Ganglia official website● wikipedia/Ganglia

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Q & A

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Fin.Now You Can Rest Easy (In Peace ?).