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ch 10 Monitoring
NCNU CSIE 97321012 林似真 Stella
NCNU CSIE Stella2010/6/8 2
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
● 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 ?).
