description Ganglia Overview
Ganglia is an open-source monitoring system that collects and aggregates network traffic data from servers, providing real-time insights into CPU usage, memory utilization, disk I/O, and network bandwidth across a distributed environment.
help Ganglia FAQ
What do gmond and gmetad do in Ganglia?
The lightweight gmond daemon runs on monitored nodes and exchanges system metrics within a cluster. The gmetad service polls one or more Ganglia data sources and stores historical numeric metrics in RRDtool databases.
Was Ganglia built for ordinary website monitoring?
Ganglia was designed primarily for high-performance computing clusters and federated grids. It excels at showing CPU, memory, load, and network trends across many nodes, while tools such as Prometheus offer a more modern application-monitoring ecosystem.
Can Ganglia monitor more than one cluster?
Yes, Ganglia calls a collection of monitored clusters a grid. A central gmetad process can aggregate several clusters into one hierarchical monitoring view.
Does Ganglia provide Prometheus-style alerting?
Ganglia's core strength is metric collection, aggregation, and graphing rather than a first-class alert manager. Teams often pair it with external scripts or monitoring systems when they need routing, silences, and escalation policies.
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