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OpenShift Metrics with Hawkular

OpenShift Metrics Installation

Requirements

This role has the following dependencies:

  • Java is required on the control node to generate keystores for the Java components
  • httpd-tools is required on the control node to generate various passwords for the metrics components

The following variables need to be set and will be validated:

  • openshift_metrics_hawkular_hostname: hostname used on the hawkular metrics route.

  • openshift_metrics_project: project (i.e. namespace) where the components will be deployed.

Role Variables

For default values, see defaults/main.yaml.

  • openshift_metrics_image_prefix: Specify prefix for metrics components; e.g for "openshift/origin-metrics-deployer:v1.1", set prefix "openshift/origin-".

  • openshift_metrics_image_version: Specify version for metrics components; e.g. for "openshift/origin-metrics-deployer:v1.1", set version "v1.1".

  • openshift_metrics_hawkular_cert: The certificate used for re-encrypting the route to Hawkular metrics. The certificate must contain the hostname used by the route. The default router certificate will be used if unspecified

  • openshift_metrics_hawkular_key: The key used with the Hawkular certificate

  • openshift_metrics_hawkular_ca: An optional certificate used to sign the Hawkular certificate.

  • openshift_metrics_hawkular_replicas: The number of replicas for Hawkular metrics.

  • openshift_metrics_hawkular_route_annotations: Dictionary with annotations for the Hawkular route.

  • openshift_metrics_cassandra_replicas: The number of Cassandra nodes to deploy for the initial cluster.

  • openshift_metrics_cassandra_storage_type: Use emptydir for ephemeral storage (for testing), pv to use persistent volumes (which need to be created before the installation) or dynamic for dynamic persistent volumes.

  • openshift_metrics_cassandra_pvc_prefix: The name of persistent volume claims created for cassandra will be this with a serial number appended to the end, starting from 1.

  • openshift_metrics_cassandra_pvc_size: The persistent volume claim size for each of the Cassandra nodes.

  • openshift_metrics_heapster_standalone: Deploy only heapster, without the Hawkular Metrics and Cassandra components.

  • openshift_metrics_heapster_allowed_users: A comma-separated list of CN to accept. By default, this is set to allow the OpenShift service proxy to connect. If you override this, make sure to add system:master-proxy to the list in order to allow horizontal pod autoscaling to function properly.

  • openshift_metrics_startup_timeout: How long in seconds we should wait until Hawkular Metrics and Heapster starts up before attempting a restart.

  • openshift_metrics_duration: How many days metrics should be stored for.

  • openshift_metrics_resolution: How often metrics should be gathered.

  • openshift_metrics_install_hawkular_agent: Install the Hawkular OpenShift Agent (HOSA). HOSA can be used to collect custom metrics from your pods. This component is currently in tech-preview and is not installed by default.

Additional variables to control resource limits

Each metrics component (hawkular, cassandra, heapster) can specify a cpu and memory limits and requests by setting the corresponding role variable:

openshift_metrics_<COMPONENT>_(limits|requests)_(memory|cpu): <VALUE>

e.g

openshift_metrics_cassandra_limits_memory: 1Gi
openshift_metrics_hawkular_requests_cpu: 100

Dependencies

openshift_facts

Example Playbook

- name: Configure openshift-metrics
  hosts: oo_first_master
  roles:
  - role: openshift_metrics

License

Apache License, Version 2.0

Author Information

Jose David Martín (j.david.nieto@gmail.com)