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If you are running applications that are not using OpenTelemetry in your Kubernetes cluster, you can still collect the logs from your containers. In this guide, you will learn how to use an OpenTelemetry Collector to get additional insight into your data by sending your container logs to Honeycomb using OpenTelemetry’s Filelog Receiver.

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Before You Begin

Before beginning this guide, you should have:

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Collect Logs

Enable the Filelog Receiver to collect logs by adding the logsCollection preset in the values file for your OpenTelemetry DaemonSet-mode Collector. Place it near the top of the values file under the config section: 
presets:
  logsCollection:
    enabled: true
Download
mode: daemonset

image:
  repository: ghcr.io/open-telemetry/opentelemetry-collector-releases/opentelemetry-collector-k8s

# Required to use the kubeletstats cpu/memory utilization metrics
clusterRole:
  create: true
  rules:
    - apiGroups: 
        - ""
      resources:
        - nodes/proxy
      verbs:
        - get

extraEnvs:
  - name: HONEYCOMB_API_KEY
    valueFrom:
      secretKeyRef:
        name: honeycomb
        key: api-key

presets:
  # enables the k8sattributesprocessor and adds it to the traces, metrics, and logs pipelines
  kubernetesAttributes:
    enabled: true
    extractAllPodLabels: true
    extractAllPodAnnotations: true
  # enables the kubeletstatsreceiver and adds it to the metrics pipelines
  kubeletMetrics:
    enabled: true

config:
  receivers:
    jaeger: null
    zipkin: null
    kubeletstats:
      insecure_skip_verify: true # required as most clusters use self-signed certificates
      collection_interval: 30s
      metric_groups:
        - node
        - pod
      metrics:
        k8s.node.uptime:
          enabled: true
        k8s.pod.uptime:
          enabled: true
        k8s.pod.cpu_limit_utilization:
          enabled: true
        k8s.pod.cpu_request_utilization:
          enabled: true
        k8s.pod.memory_limit_utilization:
          enabled: true
        k8s.pod.memory_request_utilization:
          enabled: true

  exporters:
    otlp:
      endpoint: "api.honeycomb.io:443" # US instance
      #endpoint: "api.eu1.honeycomb.io:443" # EU instance
      headers:
        "x-honeycomb-team": "${env:HONEYCOMB_API_KEY}"
    otlp/k8s-metrics:
      endpoint: "api.honeycomb.io:443" # US instance
      #endpoint: "api.eu1.honeycomb.io:443" # EU instance
      headers:
        "x-honeycomb-team": "${env:HONEYCOMB_API_KEY}"
        "x-honeycomb-dataset": "k8s-metrics"
    otlp/k8s-logs:
      endpoint: "api.honeycomb.io:443" # US instance
      #endpoint: "api.eu1.honeycomb.io:443" # EU instance
      headers:
        "x-honeycomb-team": "${env:HONEYCOMB_API_KEY}"
        "x-honeycomb-dataset": "k8s-logs"

  service:
    pipelines:
      traces:
        receivers: [otlp]
        exporters: [otlp]
      metrics:
        receivers: [kubeletstats]
        exporters: [otlp/k8s-metrics]
      logs:
        exporters: [otlp/k8s-logs]

ports:
  jaeger-compact:
    enabled: false
  jaeger-thrift:
    enabled: false
  jaeger-grpc:
    enabled: false
  zipkin:
    enabled: false

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Tune Logs Collection

By default, the logsCollection preset in the OpenTelemetry Helm chart will configure the Collector to collect all the pod logs in a cluster. In larger clusters, you may want to configure the preset to target specific pods or applications to avoid being overwhelmed.

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Restrict Logs by Location or Name

To collect only logs in a specific directory or with a specific filename, combine the preset with some configuration: 
presets:
  logsCollection:
    enabled: true

config:
  receivers:
      filelog:
        include:
          - /var/log/pods/my-namespace*/*/*.log
          - /var/log/pods/*mypodname*/*/*.log
          - /var/log/pods/*/my-containername/*.log

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Restrict Logs by Label Selector

To collect logs for only certain label selectors, use the Kubernetes Attributes processor to enable labels, and then the Filter processor to remove unwanted data: 
presets:  
  kubernetesAttributes:
    enabled: true
    extractAllPodLabels: true
  logsCollection:
    enabled: true

config:
  processors:
    filter:
      error_mode: ignore
      logs:
        log_record:
          - resource.attributes["app.kubernetes.io/component"] != "myapp1"

  exporters:
    otlp:
      endpoint: "api.honeycomb.io:443" # US instance
      #endpoint: "api.eu1.honeycomb.io:443" # EU instance
      headers:
        "x-honeycomb-team": "YOUR_API_KEY"
        "x-honeycomb-dataset": "myapp1-logs"

  service:
    pipelines:
      logs:
        receivers:
          - filelog
        processors:
          - memory_limiter
          - k8sattributes
          - filter
          - batch
        exporters:
          - otlp

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Send Logs to Different Datasets

To send specific logs to different datasets, use the Filter processor and multiple OTLP exporters: 
presets:  
  kubernetesAttributes:
    enabled: true
    extractAllPodLabels: true
  logsCollection:
    enabled: true

config:
  processors:
    filter/myapp1:
      error_mode: ignore
      logs:
        log_record:
          - resource.attributes["app.kubernetes.io/component"] != "myapp1"

    filter/myapp2:
      error_mode: ignore
      logs:
        log_record:
          - resource.attributes["app.kubernetes.io/component"] != "myapp2"

  exporters:
    otlp/myapp1:
      endpoint: "api.honeycomb.io:443" # US instance
      #endpoint: "api.eu1.honeycomb.io:443" # EU instance
      headers:
        "x-honeycomb-team": "YOUR_API_KEY"
        "x-honeycomb-dataset": "myapp1-logs"
    otlp/myapp2:
      endpoint: "api.honeycomb.io:443" # US instance
      #endpoint: "api.eu1.honeycomb.io:443" # EU instance
      headers:
        "x-honeycomb-team": "YOUR_API_KEY"
        "x-honeycomb-dataset": "myapp2-logs"

  service:
    pipelines:
      logs:
        receivers:
          - filelog
        processors:
          - memory_limiter
          - k8sattributes
          - filter/myapp1
          - batch
        exporters:
          - otlp/myapp1
      logs/myapp2:
        receivers:
          - filelog
        processors:
          - memory_limiter
          - k8sattributes
          - filter/myapp2
          - batch
        exporters:
          - otlp/myapp2