Topology

Topology

The bundled setup comes with three servers.

Frontend

The "frontend" server is considered a client, and has connections to both the "tool" and "SOB" servers. It is generally where forward-facing Web application are hosted.

Service
Address
Port

http
127.0.0.1
9000

nscp
127.0.0.1
9900

rpc
127.0.0.1
9800

receiver
127.0.0.1
9700

eval
127.0.0.1
9600

nt
127.0.0.1
9500

Tool

The "tool" server is where all the services are hosted: networked poll (np), networked tally (nt), networked ratings (nrate), networked variables (nv), etc. You could just as easily create separate servers for each service, but for simplicity, a single tool server is provided.

Service
Address
Port

http, rpc
127.0.0.1
8000

rpc
127.0.0.1
8800

nscp
127.0.0.1
8900

receiver
127.0.0.1
8700

SOB

The "SOB" server stores and publishes content from both the "frontend" and "tool" servers.

Service
Address
Port

http, rpc
127.0.0.1
7000

nscp
127.0.0.1
7900

topology.tcl

At start up, the "topology.tcl" file, found in the etc/ directory, creates an array of client lists and ports for each service as well as IP addresses for each server. This array is used by the server specific configuration files to make the needed connections and listen on the correct ports. See "Running" on the Wiki for information on starting servers.