dnms

Distributed Network Monitoring System

objective

Black-box test the network from the edges/leafs of the network

How?

Effectively a distributed ping + traceroute across the whole infrastructure at some interval. This data is then aggregated into a central setvice to expose the data through an API

Terms

Peer: another server on the network

NetworkGraph: graph of the entire network Route: a set of links NetworkNode: Router in the network-- something that should respond to traceroute Link: specific connection between 2 NetworkNodes

Ping: a ping with a specific source port PingGroup: a group of pings against a specific destination

Traceroute: a traceroute with a specific source port Traceroute Group: a group of traceroutes against a specific destination

how those fit together?

Any given node will know about the peers in the network. It will intermittently ping and traceroute peers in the network, and keep track of failures. In the event of a failure we'll determine what links are at fault for the disruption.

Implementation

The goal here is to create a few layers that in themselves create something useful

Base parts:

• Memberlist: our peers on the network to talk to
• Mapper: responsible for mapping the network based on who is in the memberlist
• Pinger: ping all peers in the network-- specifically to hit all routes in the mapper
• Aggregator: aggregate all the graph info from the members of the memberlist