Send firehose events from Cloud Foundry to syslog.

go get



This nifty util aggregates all the events from the firehose feature in CloudFoundry.

./firehose-to-syslog \
          --api-endpoint="" \
          --skip-ssl-validation \
{"cf_app_id":"c5cb762b-b7bb-44b6-97d1-2b612d4baba9","cf_app_name":"lattice","cf_org_id":"fb5777e6-e234-4832-8844-773114b505b0","cf_org_name":"GWENN","cf_origin":"firehose","cf_space_id":"3c910823-22e7-41ff-98de-094759594398","cf_space_name":"GWENN-SPACE","event_type":"LogMessage","level":"info","message_type":"OUT","msg":"Lattice-app. Says Hello. on index: 0","origin":"rep","source_instance":"0","source_type":"APP","time":"2015-06-12T11:46:11+09:00","timestamp":1434077171244715915}


usage: firehose-to-syslog --api-endpoint=API-ENDPOINT [<flags>]

  --help              Show help (also see --help-long and --help-man).
  --debug             Enable debug mode. This disables forwarding to syslog
                      Api endpoint address. For bosh-lite installation of CF:
                      Overwrite default doppler endpoint return by /v2/info
                      Syslog server.
                      Id for the subscription.
  --user="admin"      Admin user.
  --password="admin"  Admin password.
                      Please don't
  --fh-keep-alive=25s Keep Alive duration for the firehose consumer
                      Comma seperated list of events you would like. Valid options are **
                      Bolt Database path
  --cc-pull-time=60s  CloudController Pooling time in sec
  --version           Show application version.
  --mode-prof         Enable profiling mode, one of [cpu, mem, block]
  --path-prof         Set the Path to write Profiling file

** !!! --events Please use --help to get last updated event.

Endpoint definition

We use gocf-client which will call the CF endpoint /v2/info to get Auth., doppler endpoint.

But for doppler endpoint you can overwrite it with --doppler-address as we know some people use different endpoint.

Event documentation

See the dropsonde protocol documentation for details on what data is sent as part of each event.


We use boltdb for caching application name, org and space name.

We have 3 caching strategies:

  • Pull all application data on start.
  • Pull application data if not cached yet.
  • Pull all application data every "cc-pull-time".

To test and build

# Setup repo
go get
cd $GOPATH/src/

# Test
ginkgo -r .

# Build binary
godep go build

Deploy with Bosh


Run against a bosh-lite CF deployment

godep go run main.go \
    --debug \
    --skip-ssl-validation \

Parsing the logs with Logstash


Docker (tested with docker 1.7.1 / Kitematic)

We use DockerInDocker to built the image Since is around 7MG

  • For Github Master branch Image
# Make the image
make docker-final

#Run the image
docker run getourneau/firehose-to-syslog
  • For development
#Build the image
make docker-dev

#Run the image
docker run getourneau/firehose-to-syslog-dev


This is a Git Flow project. Please fork and branch your features from develop.


To enable CPU Profiling you just need to add the profiling path ex --mode-prof=cpu

Run your program for some time and after that you can use the pprof tool

go tool pprof YOUR_EXECUTABLE cpu.pprof

(pprof) top 10
110ms of 110ms total (  100%)
Showing top 10 nodes out of 44 (cum >= 20ms)
      flat  flat%   sum%        cum   cum%
      30ms 27.27% 27.27%       30ms 27.27%  syscall.Syscall
      20ms 18.18% 45.45%       20ms 18.18%  ExternalCode
      20ms 18.18% 63.64%       20ms 18.18%  runtime.futex
      10ms  9.09% 72.73%       10ms  9.09%  adjustpointers
      10ms  9.09% 81.82%       10ms  9.09%  bytes.func·001
      10ms  9.09% 90.91%       20ms 18.18%  io/ioutil.readAll
      10ms  9.09%   100%       10ms  9.09%  runtime.epollwait
         0     0%   100%       60ms 54.55%  System
         0     0%   100%       20ms 18.18%  bufio.(*Reader).Read
         0     0%   100%       20ms 18.18%  bufio.(*Reader).fill

For Mac OSX golang profiling do not work.

Push as an App to Cloud Foundry

  1. Create doppler.firehose enabled user

    uaac target https://uaa.[your cf system domain] --skip-ssl-validation
    uaac token client get admin -s [your admin-secret]
    cf create-user [firehose user] [firehose password]
    uaac member add cloud_controller.admin [your firehose user]
    uaac member add doppler.firehose [your firehose user]
  2. Download the latest release of firehose-to-syslog.

    git clone
    cd firehose-to-syslog
  3. Utilize the CF cli to authenticate with your PCF instance.

    cf login -a https://api.[your cf system domain] -u [your id] --skip-ssl-validation
  4. Push firehose-to-syslog.

    cf push firehose-to-syslog --no-start
  5. Set environment variables with cf cli or in the manifest.yml.

    cf set-env firehose-to-syslog API_ENDPOINT https://api.[your cf system domain]
    cf set-env firehose-to-syslog DOPPLER_ENDPOINT wss://doppler.[your cf system domain]:443
    cf set-env firehose-to-syslog SYSLOG_ENDPOINT [Your Syslog IP]:514
    cf set-env firehose-to-syslog LOG_EVENT_TOTALS true
    cf set-env firehose-to-syslog LOG_EVENT_TOTALS_TIME "10s"
    cf set-env firehose-to-syslog SKIP_SSL_VALIDATION true
    cf set-env firehose-to-syslog FIREHOSE_SUBSCRIPTION_ID firehose-to-syslog
    cf set-env firehose-to-syslog FIREHOSE_USER  [your doppler.firehose enabled user]
    cf set-env firehose-to-syslog FIREHOSE_PASSWORD  [your doppler.firehose enabled user password]
  6. Turn off the health check if you're staging to Diego.

    cf set-health-check firehose-to-syslog none
  7. Push the app.

    cf push firehose-to-syslog --no-route

    If you are using the offline version of the go buildpack and your app fails to stage then open up the Godeps/Godeps.json file and change the GoVersion from go1.5.3 to go1.5 and repush.


  • Ed King - Added support to skip ssl validation.
  • Mark Alston - Added support for more events and general code cleaup.
  • Etourneau Gwenn - Added validation of selected events and general code cleanup, caching system..