OpenCensus

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Navigation :

Introduction
Configuration
- Format
- Example
- Notes
End to end example
Results
References

Introduction

The OpenCensus Service allows one to export traces to Zipkin

Configuration

In the Service’s YAML configuration file, under section “exporters” and sub-section “zipkin” configure fields:

Format

exporters:
  zipkin:
    service_name: "<service_name>"
    endpoint: "<endpoint_url_of_the_zipkin_server>"
    local_endpoint: "<local_endpoint_url with scheme>"
    upload_period: "<batching time as a string e.g. ms, s, m, h, d>"

Example

# Saved in oca.yaml
exporters:
  zipkin:
    service_name: "opencensus"
    endpoint: "http://localhost:9411/api/v2/spans"
    upload_period: 4s
    local_endpoint: "localhost:5544"

Notes

Please ensure that endpoint DOES NOT point to the same address as that of the Zipkin receiver

End to end example

In this end-to-end example, we’ll have the OpenCensus Service running and a couple of Go applications that use the Go ocagent-exporter to send over traces to OpenCensus Service and then to Zipkin.

Running Zipkin

First, we need to get Zipkin running

For assistance setting up Zipkin, Click here for a guided codelab.

With Zipkin running, we are ready to proceed with running the demo.

Running OpenCensus Service

The OpenCensus Service will run with Zipkin as the only exporter, but receive traffic from ocagent-exporter-using applications.

On starting the OpenCensus Service with the configuration below:

exporters:
  zipkin:
    service_name: "opencensus"
    endpoint: "http://localhost:9411/api/v2/spans"
    upload_period: 4s
    local_endpoint: "localhost:5544"

On running the OpenCensus Service:

{"level":"info","ts":1550128147.9330611,"caller":"config/config.go:424","msg":"Trace Exporter enabled","exporter":"zipkin"}

Running Application Code

And then running the ocagent-go-exporter main.go application

The ocagent.WithAddress can be changed in main.go to point to the OpenCensus Collector directly if desired.

$ GO111MODULE=on go run example/main.go
Latency: 861.160ms
#0: LineLength: 432By
#1: LineLength: 366By
#2: LineLength: 765By
Latency: 11551.507ms
#0: LineLength: 920By
#1: LineLength: 921By
Latency: 7655.319ms
#0: LineLength: 558By
#1: LineLength: 725By
#2: LineLength: 508By
Latency: 651.339ms

Results

On navigating to the Zipkin UI at http://localhost:9411/zipkin

All traces

Single trace

Trace detail

References

Resource	URL
Zipkin project home	https://zipkin.io/
Go ocagent-exporter demo	ocagent-demo