The Munin master¶
For an overview see Architectural Fundamentals
The munin master is responsible for gathering data from munin nodes. It stores this data in RRD , files, and graphs them on request. It also checks whether the fetched values fell below or go over specific thresholds (warning, critical) and will send alerts if this happens and the administrator configured it to do so.
|||RRDtool (acronym for round-robin database tool) aims to handle time-series data like network bandwidth, temperatures, CPU load, etc. The data are stored in a round-robin database (circular buffer), thus the system storage footprint remains constant over time. Source Wikipedia: http://en.wikipedia.org/wiki/RRDtool|
The following components are part of munin-master:
Additionally munin 2.0 contains two more components:
- Let Munin croak alarm
- Scaling the munin master with rrdcached