container_metrics/

Container Metrics Sample

Overview

We can use Dropsonde to send container metrics to metron which will emit them to Doppler; which is then polled by trafficcontroller. The endpoint on the trafficcontroller should report the latest container metric for each instance of the specified app.

samples/container_metrics/consumer/main.go connects to the trafficcontroller and polls the container metrics endpoint.

samples/container_metrics/emitter/main.go is a sample app that emits container metrics to metron using the dropsonde library.

To see containter metrics:

1. Push an app:

    cf push some-app
   

2. Export the app's guid as an environment variable:

    export APP_GUID=$(cf app some-app --guid)
   

3. Take note of the app GUID, you will need it later:

    echo $APP_GUID
   

4. Set the doppler address as an environment variable:

    export DOPPLER_ADDR="wss://your-doppler.example.com/"
   

5. Export your access token:

    export CF_ACCESS_TOKEN=$(cf oauth-token | grep bear)
   

6. Start the consumer:

    go run samples/container_metrics/consumer/main.go
   

7. Now build the emitter in a new terminal window. Make sure your $GOPATH is set and run:

    GOOS=linux go build -o bin/emitter samples/container_metrics/emitter/main.go
   

8. Move the emitter executable onto a machine with metron running inside your cf deployment:

    scp bin/emitter vcap@bosh.example.com:emitter
    ssh -A vcap@bosh.example.com
   

9. You can get a VM IP by doing bosh vms and selecting an IP:

    scp emitter vcap@some.vm.ip:emitter
    ssh vcap@some.vm.ip
    export APP_GUID="YOUR-APP-GUID"
    ./emitter
   

10. You should now see metrics appearing in the listener window.

Things to look for:

1. The diskBytes value should be increasing.
2. The diskBytes value should be skipping some numbers, this is b/c we are listening on a three second window, but publishing on a one second window and are only returning the most recent result.
3. There should be only entries for the applicationId you entered with multiple instance indexes.