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In this example we show how to use `Node.Survey` to collect channel information from all running Centrifuge nodes.
Start Redis server locally:
```
redis-server
```
Start first example instance on port 8000:
```
go run main.go -port 8000
```
Then start another example instance on port 8001 (in another terminal):
```
go run main.go -port 8001
```
Go to http://localhost:8000 and to http://localhost:8001 in another browser tab. Clients will subscribe to channels (each to its `window.location.host`), each second survey will ask for all active channels with number of subscribers from all running nodes.
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