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sink-configuration.md

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Configuring sinks

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

Log

This sinks writes all data to the standard output which is particularly useful for debugging.

--sink=log

InfluxDB

This sink supports both monitoring metrics and events. Supports InfluxDB versions v0.9 and above 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)
  • retention - Duration of the default InfluxDB retention policy, e.g. 4h or 7d (default: 0 meaning infinite)
  • secure - Connect securely to InfluxDB (default: false)
  • insecuressl - Ignore SSL certificate validity (default: false)
  • withfields - Use InfluxDB fields (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

GCM has one option - metrics that can be set to:

  • all - the sink exports all metrics
  • autoscaling - the sink exports only autoscaling-related metrics

Google Cloud Logging

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

--sink=gcl

Notes:

  • This sink works only on a Google Compute Enginer VM as of now
  • GCE instance must have “https://www.googleapis.com/auth/logging.write” auth scope
  • GCE instance must have Logging API enabled for the project in Google Developer Console
  • GCL Logs are accessible via:
    • https://console.developers.google.com/project/<project_ID>/logs?service=custom.googleapis.com
    • Where project_ID is the project ID of the Google Cloud Platform project ID.
    • Select kubernetes.io/events from the All logs drop down menu.

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. To use SSL, the HAWKULAR_SERVER_URL has to start with https

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
  • useServiceAccount - Sink will use the service account token to authorize to Hawkular-Metrics (requires OpenShift)
  • insecure - SSL connection will not verify the certificates
  • caCert - A path to the CA Certificate file that will be used in the connection
  • auth - Kubernetes authentication file that will be used for constructing the TLSConfig
  • user - Username to connect to the Hawkular-Metrics server
  • pass - Password to connect to the Hawkular-Metrics server
  • filter - Allows bypassing the store of matching metrics, any number of filter parameters can be given with a syntax of filter=operation(param). Supported operations and their params:
    • label - The syntax is label(labelName:regexp) where labelName is 1:1 match and regexp to use for matching is given after : delimiter
    • name - The syntax is name(regexp) where MetricName is matched (such as cpu/usage) with a regexp filter
  • batchSize- How many metrics are sent in each request to Hawkular-Metrics (default is 1000)
  • concurrencyLimit- How many concurrent requests are used to send data to the Hawkular-Metrics (default is 5)

A combination of insecure / caCert / auth is not supported, only a single of these parameters is allowed at once. Also, combination of useServiceAccount and user + pass is not supported. To increase the performance of Hawkular sink in case of multiple instances of Hawkular-Metrics (such as scaled scenario in OpenShift) modify the parameters of batchSize and concurrencyLimit to balance the load on Hawkular-Metrics instances.

OpenTSDB

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

--sink=opentsdb:<OPENTSDB_SERVER_URL>

Currently, accessing opentsdb via its rest apis doesn't need any authentication, so you can enable opentsdb sink like this:

--sink=opentsdb:http://192.168.1.8:4242

Monasca

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

--sink=monasca:[?<OPTIONS>]

The available options are listed below, and some of them are mandatory. You need to provide access to the Identity service of OpenStack (keystone). Currently, only authorization through username / userID + password / APIKey is supported. If the agent access (for sending metrics) to Monasca is restricted to a role, please specify the corresponding tenant-id for automatic scoped authorization.

The Monasca sink is then created with either the provided Monasca API Server URL, or the URL is discovered automatically if none is provided by the user.

The following options are available:

  • user-id - ID of the OpenStack user
  • username - Name of the OpenStack user
  • tenant-id - ID of the OpenStack tenant (project)
  • keystone-url - URL to the Keystone identity service (mandatory). Must be a v3 server (required by Monasca)
  • password - Password of the OpenStack user
  • api-key - API-Key for the OpenStack user
  • domain-id - ID of the OpenStack user's domain
  • domain-name - Name of the OpenStack user's domain
  • monasca-url - URL of the Monasca API server (optional: the sink will attempt to discover the service if not provided)

Kafka

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

--sink="kafka:<?<OPTIONS>>"

Normally, kafka server has multi brokers, so brokers' list need be configured for producer. So, we provide kafka brokers' list and topics about timeseries & topic in url's query string. Options can be set in query string, like this:

  • brokers - Kafka's brokers' list.
  • timeseriestopic - Kafka's topic for timeseries. Default value : heapster-metrics
  • eventstopic - Kafka's topic for events.Default value : heapster-events

For example,

--sink="kafka:?brokers=localhost:9092&brokers=localhost:9093&timeseriestopic=testseries&eventstopic=testtopic"

Riemann

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

--sink="riemann:<RIEMANN_SERVER_URL>[?<OPTIONS>]"

The following options are available:

  • ttl - TTL for writes to Riemann. Default: 60 seconds
  • state - FIXME. Default: ""
  • tags - FIXME. Default. none
  • storeEvents - Control storage of events. Default: true

Elasticsearch

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

    --sink=elasticsearch:<ES_SERVER_URL>[?<OPTIONS>]

Normally an ElasticSearch cluster has multiple nodes or a proxy, so these need to be configured for the ElasticSearch sink. To do this, you can set ES_SERVER_URL to a dummy value, and use the ?nodes= query value for each additional node in the cluster. For example:

  --sink=elasticsearch:?nodes=http://foo.com:9200&nodes=http://bar.com:9200

(*) Notice that using the ?nodes notation will override the ES_SERVER_URL

Besides this, the following options can be set in query string:

(*) Note that the keys are case sensitive

  • index - the index for metrics and events. The default is heapster
  • esUserName - the username if authentication is enabled
  • esUserSecret - the password if authentication is enabled
  • maxRetries - the number of retries that the Elastic client will perform for a single request after before giving up and return an error. It is 0 by default, so retry is disabled by default.
  • healthCheck - specifies if healthchecks are enabled by default. It is enabled by default. To disable, provide a negative boolean value like 0 or false.
  • sniff - specifies if the sniffer is enabled by default. It is enabled by default. To disable, provide a negative boolean value like 0 or false.
  • startupHealthcheckTimeout - the time in seconds the healthcheck waits for a response from Elasticsearch on startup, i.e. when creating a client. The default value is 1.
  • bulkWorkers - number of workers for bulk processing. Default value is 5.
  • cluster_name - cluster name for different Kubernetes clusters. Default value is default.

Like this:

--sink="elasticsearch:?nodes=http://127.0.0.1:9200&index=testMetric"

or

--sink="elasticsearch:?nodes=http://127.0.0.1:9200&index=testEvent"

AWS Integration

In order to use AWS Managed Elastic we need to use one of the following methods:

  1. Making sure the public IPs of the Heapster are allowed on the ElasticSearch's Access Policy

-OR-

  1. Configuring an Access Policy with IAM

    1. Configure the ElasticSearch cluster policy with IAM User
    2. Create a secret that stores the IAM credentials
    3. Expose the credentials to the environment variables: AWS_ACCESS_KEY_ID and AWS_SECRET_ACCESS_KEY
    env:
  - name: AWS_ACCESS_KEY_ID
    valueFrom:
      secretKeyRef:
        name: aws-heapster
        key: aws.id
  - name: AWS_SECRET_ACCESS_KEY
    valueFrom:
      secretKeyRef:
        name: aws-heapster
        key: aws.secret

Graphite/Carbon

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

--sink="graphite:<PROTOCOL>://<HOST>[:<PORT>][<?<OPTIONS>>]"

PROTOCOL must be tcp or udp, PORT is 2003 by default.

These options are available:

  • prefix - Adds specified prefix to all metric paths

For example,

--sink="graphite:tcp://metrics.example.com:2003?prefix=kubernetes.example"

Metrics are sent to Graphite with this hierarchy:

  • PREFIX
    • cluster
    • namespaces
      • NAMESPACE
    • nodes
      • NODE
        • pods
          • NAMESPACE
            • POD
              • containers
                • CONTAINER
        • sys-containers
          • SYS-CONTAINER

Using multiple sinks

Heapster can be configured to send k8s metrics and events to multiple sinks by specifying the--sink=... flag multiple times.

For example, to send data to both gcm and influxdb at the same time, you can use the following:

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