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sink-configuration.md

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Configuring sources

Heapster can store data into different backends (sinks). These are specified on the command line via the --sink flag. The flag takes an argument of the form PREFIX:CONFIG[?OPTIONS]. Options (optional!) are specified as URL query parameters, separated by & as normal. This allows each source to have custom configuration passed to it without needing to continually add new flags to Heapster as new sinks are added. This also means heapster can store data into multiple sinks at once.

Current sinks

InfluxDB

This sink supports both monitoring metrics and events. To use the InfluxDB sink add the following flag:

--sink=influxdb:<INFLUXDB_URL>[?<INFLUXDB_OPTIONS>]

If you're running Heapster in a Kubernetes cluster with the default InfluxDB + Grafana setup you can use the following flag:

--sink=influxdb:http://monitoring-influxdb:80/

The following options are available:

  • user - InfluxDB username (default: root)
  • pw - InfluxDB password (default: root)
  • db - InfluxDB Database name (default: k8s)
  • avoidColumns - When set to true, labels are folded into the series name (default: false)

Google Cloud Monitoring

This sink supports monitoring metrics only. To use the GCM sink add the following flag:

--sink=gcm

Note: This sink works only on a Google Compute Enginer VM as of now

This sink does not export any options!

Google Cloud Monitoring Autoscaling

This sink supports monitoring metrics for autoscaling purposes only. To use the GCM Autoscaling sink add the following flag:

--sink=gcmautoscaling

Note: This sink works only on a Google Compute Enginer VM as of now

This sink does not export any options!

Google Cloud Logging

This sink supports events only. To use the InfluxDB sink add the following flag:

--sink=gcl

Note: This sink works only on a Google Compute Enginer VM as of now

This sink does not export any options!

Hawkular-Metrics

This sink supports monitoring metrics only. To use the Hawkular-Metrics sink add the following flag:

--sink=hawkular:<HAWKULAR_SERVER_URL>[?<OPTIONS>]

If HAWKULAR_SERVER_URL includes any path, the default hawkular/metrics is overridden.

The following options are available:

  • tenant - Hawkular-Metrics tenantId (default: heapster)
  • labelToTenant - Hawkular-Metrics uses given label's value as tenant value when storing data

Modifying the sinks at runtime

Using the /api/v1/sinks endpoint, it is possible to fetch the sinks currently in use via a GET request or to change them via a POST request. The format is the same as when passed via command line flags.

For example, to set gcm and influxdb as sinks, you may do the following:

echo '["gcm", "influxdb:http://monitoring-influxdb:8086"]' | curl \
    --insecure -u admin:<password> -X POST -d @- \
    -H "Accept: application/json" -H "Content-Type: application/json" \
    https://<master-ip>/api/v1/proxy/namespaces/kube-system/services/monitoring-heapster/api/v1/sinks