Docs » Supported integrations in Splunk Observability Cloud » Collector components: Receivers » Kubernetes objects receiver

Kubernetes objects receiver 🔗

The Kubernetes Objects receiver collects objects from the Kubernetes API server. The supported pipeline is logs. See Process your data with pipelines and Collect logs and events for the Collector for Kubernetes for more information.

Note

This receiver supports authentication via service accounts only at the moment.

Get started 🔗

To activate the Kubernetes Objects receiver, use this Helm configuration:

k8sObjects:
  - name: pods
    mode: pull
    label_selector: environment in (production),tier in (frontend)
    field_selector: status.phase=Running
    interval: 15m
  - name: events
    mode: watch
    group: events.k8s.io
    namespaces: [default]

To complete the configuration, include the receiver in the logs pipelines of the service section of your configuration file. For example:

logs/objects:
  receivers:
    - k8sObjects

Activate the receiver manually 🔗

To activate the Kubernetes Objects receiver manually in the Collector configuration, add k8sobjects to the receivers section of your configuration file, as shown in the following example:

k8sobjects:
  auth_type: serviceAccount
  objects:
    - name: pods
      mode: pull
      label_selector: environment in (production),tier in (frontend)
      field_selector: status.phase=Running
      interval: 15m
    - name: events
      mode: watch
      group: events.k8s.io
      namespaces: [default]

Main settings 🔗

These are the main configuration properties:

  • auth_type. serviceAccount by default. Determines how to authenticate to the Kubernetes API server. Values include none (for no authentication), serviceAccount (to use the standard service account token provided to the agent pod), or kubeConfig to use credentials from ~/.kube/config.

  • name. Name of the resource object to collect.

  • mode. Defines how the object is collected:

    • pull mode reads all objects of this type that use the list API at an interval.

    • watch mode sets up a long connection using the watch API to just get updates.

  • label_selector. Select objects by label(s).

  • field_selector. Select objects by field(s).

  • interval. 60m (minutes) by default. In pull mode, the interval at which the object is pulled.

  • exclude_watch_type. In watch mode, it allows excluding specific watch types. Valid values are ADDED, MODIFIED, DELETED, BOOKMARK, and ERROR.

  • resource_version. 1 by default. In watch mode, it allows watch resources starting from a specific version. If not specified, the receiver will do an initial list to get the resourceVersion before starting the watch. See Kubernetes’ Efficient Detection of Change for details on why this is necessary.

  • namespaces. all by default. An array of namespaces to collect events from.

  • group. Optional. API group name. When a given resource object is present in multiple groups, use this field to specify which group to select. By default, it selects the first group.

    • For example, if the events resource is available in both the v1 and events.k8s.io/v1 APIGroup, it will select v1 by default.

See more at Settings.

Configure the resources for the Kubernetes deployment 🔗

Follow these sections to set up the various Kubernetes resources required to deploy the Collector with the receiver.

Configuration 🔗

Create a ConfigMap with the config for otelcontribcol, replacing OTLP_ENDPOINT with a valid value.

apiVersion: v1
kind: ConfigMap
metadata:
  name: otelcontribcol
  labels:
    app: otelcontribcol
data:
  config.yaml: |
    receivers:
      k8sobjects:
        objects:
          - name: pods
            mode: pull
          - name: events
            mode: watch
    exporters:
      otlp:
        endpoint: <OTLP_ENDPOINT>
        tls:
          insecure: true

    service:
      pipelines:
        logs:
          receivers: [k8sobjects]
          exporters: [otlp]

Service account 🔗

Create a service account for the Collector to use.

apiVersion: v1
kind: ServiceAccount
metadata:
   labels:
      app: otelcontribcol
   name: otelcontribcol

Role-based access control (RBAC) 🔗

Use the commands in this section to create a ClusterRole with the required permissions and a ClusterRoleBinding to grant the role to the service account created in the previous section.

Note

This example will only collect pods and events. To collect other objects, add the appropriate rules.

When using watch mode you must also specify the list verb so that the receiver has permission to do its initial list if no resource_version was supplied, or use a list to recover from 410 Gone scenarios. Learn more in the official Kubernetes documentation at “410 Gone” responses .

apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
  name: otelcontribcol
  labels:
    app: otelcontribcol
rules:
- apiGroups:
  - ""
  resources:
  - events
  - pods
  verbs:
  - get
  - list
  - watch
- apiGroups:
  - "events.k8s.io"
  resources:
  - events
  verbs:
  - watch
  - list

apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  name: otelcontribcol
  labels:
    app: otelcontribcol
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: otelcontribcol
subjects:
- kind: ServiceAccount
  name: otelcontribcol
  namespace: default

Deployment 🔗

Deploy the Collector with the Kubernetes Objects receiver as one replica, otherwise it’ll produce duplicated data.

apiVersion: apps/v1
kind: Deployment
metadata:
  name: otelcontribcol
  labels:
     app: otelcontribcol

spec:
   replicas: 1
   selector:
      matchLabels:
      app: otelcontribcol
template:
   metadata:
      labels:
         app: otelcontribcol
   spec:
      serviceAccountName: otelcontribcol
      containers:
      - name: otelcontribcol
        image: otelcontribcol:latest # specify image
        args: ["--config", "/etc/config/config.yaml"]
        volumeMounts:
        - name: config
          mountPath: /etc/config
        imagePullPolicy: IfNotPresent
      volumes:
        - name: config
          configMap:
            name: otelcontribcol

Settings 🔗

The following table shows the configuration options for the receiver:

Troubleshooting 🔗

Ensure resources are allocated 🔗

If the receiver returns an error similar to the one below, make sure that resource is added to ClusterRole.

{"kind": "receiver", "name": "k8sobjects", "pipeline": "logs", "resource": "events.k8s.io/v1, Resource=events", "error": "unknown"}

General troubleshooting 🔗

If you are a Splunk Observability Cloud customer and are not able to see your data in Splunk Observability Cloud, you can get help in the following ways.

Available to Splunk Observability Cloud customers

Available to prospective customers and free trial users

  • Ask a question and get answers through community support at Splunk Answers .

  • Join the Splunk #observability user group Slack channel to communicate with customers, partners, and Splunk employees worldwide. To join, see Chat groups in the Get Started with Splunk Community manual.

This page was last updated on Sep 18, 2024.