kubeletstats receiver: "Get \"https://NODE_NAME:10250/stats/summary\": dial tcp: lookup NODE_NAME on 10.245.0.10:53: no such host" #22843

devurandom · 2023-05-27T19:30:30Z

Component(s)

receiver/kubeletstats

What happened?

Description

I set up OpenTelemetry Collector as a agent on each node using the Helm Chart and the values.yaml template below. The kubeletstatsreceiver tries to resolve the Kubernetes node name that the Helm Chart injects as its endpoint via the cluster's DNS, but fails (see logs below).

This seems similar to how the Kubernetes metrics-server tried to do the same and then was changed to resolve the node via the Kubernetes API and the InternalIP field of the node status.

Steps to Reproduce

See values.yaml file below. I deployed it to a DigitalOcean Kubernetes cluster.

Expected Result

kubeletstatsreceiver should "just work".

Actual Result

See the error message and stack trace below.

Collector version

0.77.0

Environment information

Environment

OS: DigitalOcean Kubernetes

OpenTelemetry Collector configuration

# Helm values.yaml template
# ${redeploy_trigger}
fullnameOverride: "collector"
mode: "daemonset"
image:
  # https://github.com/open-telemetry/opentelemetry-collector-contrib/issues/22815
  tag: "0.77.0"
service:
  enabled: true
presets:
  logsCollection:
    enabled: true
  hostMetrics:
    enabled: true
  kubernetesAttributes:
    enabled: true
  kubeletMetrics:
    enabled: true
config:
  extensions:
    basicauth/otlp:
      client_auth:
        username: "$${env:INSTANCE_ID}"
        password: "$${env:PUBLISHER_TOKEN}"
  processors:
    # https://community.grafana.com/t/error-sending-logs-with-loki-resource-labels/87561
    resource:
      attributes:
        - action: insert
          key: service_name
          from_attribute: service.name
        - action: insert
          key: service_namespace
          from_attribute: service.namespace
        - action: insert
          key: service_version
          from_attribute: service.version
        - action: insert
          key: deployment_environment
          from_attribute: deployment.environment
        - action: insert
          key: loki.resource.labels
          value: service_name,service_namespace,service_version,deployment_environment
  receivers:
    jaeger: null
    zipkin: null
  exporters:
    otlphttp:
      auth:
        authenticator: basicauth/otlp
      endpoint: "$${env:EXPORT_URL}"
  service:
    extensions:
      - health_check
      - memory_ballast
      - basicauth/otlp
    pipelines:
      metrics:
        receivers:
          - otlp
          - prometheus
        exporters:
          - otlphttp
      traces:
        receivers:
          - otlp
        exporters:
          - otlphttp
      logs:
        receivers:
          - otlp
        processors:
          - resource
          - memory_limiter
          - batch
        exporters:
          - otlphttp
extraEnvs:
  - name: INSTANCE_ID
    valueFrom:
      secretKeyRef:
        name: "${grafana_secret}"
        key: instance_id
  - name: PUBLISHER_TOKEN
    valueFrom:
      secretKeyRef:
        name: "${grafana_secret}"
        key: publisher_token
  - name: EXPORT_URL
    valueFrom:
      secretKeyRef:
        name: "${grafana_secret}"
        key: export_url

Log output

2023-05-27T19:12:22.078Z	error	kubeletstatsreceiver@v0.77.0/scraper.go:79	call to /stats/summary endpoint failed	{"kind": "receiver", "name": "kubeletstats", "data_type": "metrics", "error": "Get \"https://NODE_NAME:10250/stats/summary\": dial tcp: lookup NODE_NAME on 10.245.0.10:53: no such host"}
github.com/open-telemetry/opentelemetry-collector-contrib/receiver/kubeletstatsreceiver.(*kubletScraper).scrape
	github.com/open-telemetry/opentelemetry-collector-contrib/receiver/kubeletstatsreceiver@v0.77.0/scraper.go:79
go.opentelemetry.io/collector/receiver/scraperhelper.ScrapeFunc.Scrape
	go.opentelemetry.io/collector/receiver@v0.77.0/scraperhelper/scraper.go:31
go.opentelemetry.io/collector/receiver/scraperhelper.(*controller).scrapeMetricsAndReport
	go.opentelemetry.io/collector/receiver@v0.77.0/scraperhelper/scrapercontroller.go:209
go.opentelemetry.io/collector/receiver/scraperhelper.(*controller).startScraping.func1
	go.opentelemetry.io/collector/receiver@v0.77.0/scraperhelper/scrapercontroller.go:191
2023-05-27T19:12:22.078Z	error	scraperhelper/scrapercontroller.go:212	Error scraping metrics	{"kind": "receiver", "name": "kubeletstats", "data_type": "metrics", "error": "Get \"https://NODE_NAME:10250/stats/summary\": dial tcp: lookup NODE_NAME on 10.245.0.10:53: no such host", "scraper": "kubeletstats"}
go.opentelemetry.io/collector/receiver/scraperhelper.(*controller).scrapeMetricsAndReport
	go.opentelemetry.io/collector/receiver@v0.77.0/scraperhelper/scrapercontroller.go:212
go.opentelemetry.io/collector/receiver/scraperhelper.(*controller).startScraping.func1
	go.opentelemetry.io/collector/receiver@v0.77.0/scraperhelper/scrapercontroller.go:191

Additional context

Is there a workaround, e.g. relying on metrics-server or kube-state-metrics? How would I configure that?

The text was updated successfully, but these errors were encountered:

github-actions · 2023-05-27T19:30:47Z

Pinging code owners:

receiver/kubeletstats: @dmitryax

See Adding Labels via Comments if you do not have permissions to add labels yourself.

github-actions · 2023-07-27T03:29:16Z

This issue has been inactive for 60 days. It will be closed in 60 days if there is no activity. To ping code owners by adding a component label, see Adding Labels via Comments, or if you are unsure of which component this issue relates to, please ping @open-telemetry/collector-contrib-triagers. If this issue is still relevant, please ping the code owners or leave a comment explaining why it is still relevant. Otherwise, please close it.

Pinging code owners:

receiver/kubeletstats: @dmitryax
needs: Github issue template generation code needs this to generate the corresponding labels.

See Adding Labels via Comments if you do not have permissions to add labels yourself.

devurandom · 2023-08-29T10:17:12Z

@open-telemetry/collector-contrib-triagers

crobert-1 · 2023-09-27T18:37:27Z

Apologies for the delay here. Is this the full and correct config file? I'm confused as to why you're getting kubeletstats receiver errors when there's no kubeletstats receiver defined, or in your pipeline shown.

devurandom · 2023-10-01T13:02:19Z

Apologies for the delay here. Is this the full and correct config file? I'm confused as to why you're getting kubeletstats receiver errors when there's no kubeletstats receiver defined, or in your pipeline shown.

Thank you for your response!

The Helm Chart enables the kubeletstats receiver under the kubeletMetrics flag:

{{- if .Values.presets.kubeletMetrics.enabled }}
{{- $config = (include "opentelemetry-collector.applyKubeletMetricsConfig" (dict "Values" $data "config" $config) | fromYaml) }}
{{- end }}
[...]
{{- tpl (toYaml $config) . }}

(from https://github.com/open-telemetry/opentelemetry-helm-charts/blob/3471a2afe2d5e01d23b4bc02f62ef70077c7dcc7/charts/opentelemetry-collector/templates/_config.tpl#L43-L45 and https://github.com/open-telemetry/opentelemetry-helm-charts/blob/3471a2afe2d5e01d23b4bc02f62ef70077c7dcc7/charts/opentelemetry-collector/templates/_config.tpl#L52, the version of the Helm Chart I tried might have been different)

applyKubeletMetricsConfig is:

{{- define "opentelemetry-collector.applyKubeletMetricsConfig" -}}
{{- $config := mustMergeOverwrite (include "opentelemetry-collector.kubeletMetricsConfig" .Values | fromYaml) .config }}
{{- $_ := set $config.service.pipelines.metrics "receivers" (append $config.service.pipelines.metrics.receivers "kubeletstats" | uniq)  }}
{{- $config | toYaml }}
{{- end }}

{{- define "opentelemetry-collector.kubeletMetricsConfig" -}}
receivers:
  kubeletstats:
    collection_interval: 20s
    auth_type: "serviceAccount"
    endpoint: "${env:K8S_NODE_NAME}:10250"
{{- end }}

(from https://github.com/open-telemetry/opentelemetry-helm-charts/blob/3471a2afe2d5e01d23b4bc02f62ef70077c7dcc7/charts/opentelemetry-collector/templates/_config.tpl#L151-L163, the version of the Helm Chart I tried might have been different)

paulohmorais · 2023-10-11T14:49:01Z

Same problem here

Digital Oean K8s

The IP from the error is kube-dns svc:

kube-system kube-dns ClusterIP 10.245.0.10 dns:53►0╱UDP dns-tcp:53►0 metrics:9153►0

Errors logs:

│ signoz-k8s-metrics-exporter-k8s-infra-otel-agent-dnl9x 2023-09-06T22:25:02.668Z    error    scraperhelper/scrapercontroller.go:213    Error scraping metrics    {"kind": "receiver", "name": "kubeletstats", "data_type": "metrics", "error": "Get \"https://w-pool-uy4qaitgx-y74ag:10250/stats/summary\": dial tcp: lookup w-pool-uy4qaitgx-y74ag on 10.245.0.10:53: no such host", "scraper": "kubeletstats"}                                                      │
│ signoz-k8s-metrics-exporter-k8s-infra-otel-agent-dnl9x go.opentelemetry.io/collector/receiver/scraperhelper.(*controller).scrapeMetricsAndReport                                                                                                                                                                                                                                                                                                                                         │
│ signoz-k8s-metrics-exporter-k8s-infra-otel-agent-dnl9x     go.opentelemetry.io/collector/receiver@v0.79.0/scraperhelper/scrapercontroller.go:213                                                                                                                                                                                                                                                                                                                                         │
│ signoz-k8s-metrics-exporter-k8s-infra-otel-agent-dnl9x go.opentelemetry.io/collector/receiver/scraperhelper.(*controller).startScraping.func1                                                                                                                                                                                                                                                                                                                                            │
│ signoz-k8s-metrics-exporter-k8s-infra-otel-agent-dnl9x     go.opentelemetry.io/collector/receiver@v0.79.0/scraperhelper/scrapercontroller.go:192                                                                                                                                                                                                                                                                                                                                         │
│ signoz-k8s-metrics-exporter-k8s-infra-otel-agent-dnl9x 2023-09-06T22:25:32.665Z    error    kubeletstatsreceiver@v0.79.0/scraper.go:68    call to /stats/summary endpoint failed    {"kind": "receiver", "name": "kubeletstats", "data_type": "metrics", "error": "Get \"https://w-pool-uy4qaitgx-y74ag:10250/stats/summary\": dial tcp: lookup w-pool-uy4qaitgx-y74ag on 10.245.0.10:53: no such host"}                                                             │
│ signoz-k8s-metrics-exporter-k8s-infra-otel-agent-dnl9x github.com/open-telemetry/opentelemetry-collector-contrib/receiver/kubeletstatsreceiver.(*kubletScraper).scrape                                                                                                                                                                                                                                                                                                                   │
│ signoz-k8s-metrics-exporter-k8s-infra-otel-agent-dnl9x     github.com/open-telemetry/opentelemetry-collector-contrib/receiver/kubeletstatsreceiver@v0.79.0/scraper.go:68                                                                                                                                                                                                                                                                                                                 │
│ signoz-k8s-metrics-exporter-k8s-infra-otel-agent-dnl9x go.opentelemetry.io/collector/receiver/scraperhelper.ScrapeFunc.Scrape                                                                                                                                                                                                                                                                                                                                                            │
│ signoz-k8s-metrics-exporter-k8s-infra-otel-agent-dnl9x     go.opentelemetry.io/collector/receiver@v0.79.0/scraperhelper/scraper.go:20                                                                                                                                                                                                                                                                                                                                                    │
│ signoz-k8s-metrics-exporter-k8s-infra-otel-agent-dnl9x go.opentelemetry.io/collector/receiver/scraperhelper.(*controller).scrapeMetricsAndReport                                                                                                                                                                                                                                                                                                                                         │
│ signoz-k8s-metrics-exporter-k8s-infra-otel-agent-dnl9x     go.opentelemetry.io/collector/receiver@v0.79.0/scraperhelper/scrapercontroller.go:210                                                                                                                                                                                                                                                                                                                                         │
│ signoz-k8s-metrics-exporter-k8s-infra-otel-agent-dnl9x go.opentelemetry.io/collector/receiver/scraperhelper.(*controller).startScraping.func1                                                                                                                                                                                                                                                                                                                                            │
│ signoz-k8s-metrics-exporter-k8s-infra-otel-agent-dnl9x     go.opentelemetry.io/collector/receiver@v0.79.0/scraperhelper/scrapercontroller.go:192

jinja2 · 2023-10-12T00:32:23Z

Usually, cloud provider managed compute services have a private DNS setup for vms, and then the node's local domain is appended to the /etc/resolv.conf passed to k8s pods by the kubelet which makes the k8s node name (when same as the vm's hostname) resolvable. I am not familiar with Digital Ocean, but maybe they don't have a similar setup or the instances are not assigned private dnses. Either ways, you can use the node IP instead which can be passed as env var with a snippet like below

env:
- name: K8S_NODE_IP
  valueFrom:
    fieldRef:
      fieldPath: status.hostIP

and then in the kubeletstats receiver

receivers:
  kubeletstats:
    endpoint: "${env:K8S_NODE_IP}:10250"

I would suggest opening up an issue in the chart repo to add using the node ip as an option and closing this one. This isn't something to fix in the receiver, instead it can be resolved with changes to the config passed to it.

crobert-1 · 2023-10-12T16:05:07Z

@devurandom Let us know if any other information would be helpful! Otherwise, feel free to close the issue and open another one in the chart repo as @jinja2 suggested.

crobert-1 · 2023-10-30T19:18:44Z

I'm going to close this issue for now, but please feel free to let us know if you have any other questions.

Not all k8s deployments resolve the node host name to an IP. This is generally true inside of cloud providers, but not necessarily the case when self-hosting. Fixes open-telemetry/opentelemetry-collector-contrib#22843

alextricity25 · 2024-05-30T16:19:42Z

Usually, cloud provider managed compute services have a private DNS setup for vms, and then the node's local domain is appended to the /etc/resolv.conf passed to k8s pods by the kubelet which makes the k8s node name (when same as the vm's hostname) resolvable. I am not familiar with Digital Ocean, but maybe they don't have a similar setup or the instances are not assigned private dnses. Either ways, you can use the node IP instead which can be passed as env var with a snippet like below
env:
- name: K8S_NODE_IP
  valueFrom:
    fieldRef:
      fieldPath: status.hostIP
and then in the kubeletstats receiver
receivers:
  kubeletstats:
    endpoint: "${env:K8S_NODE_IP}:10250"
I would suggest opening up an issue in the chart repo to add using the node ip as an option and closing this one. This isn't something to fix in the receiver, instead it can be resolved with changes to the config passed to it.

For those interested, I opened up a PR in the charts repo here:
open-telemetry/opentelemetry-helm-charts#1206

momenthana · 2024-07-29T10:09:20Z

The above configuration was effective for me in addressing issues I was experiencing on DigitalOcean.

Since I was too busy to wait for a new chart version to be deployed, I added the following environment variable configuration to the opentelemetry-collector-daemonset Helm chart and used it with the existing chart version:

extraEnvs:
  - name: K8S_NODE_IP
    valueFrom:
      fieldRef:
        fieldPath: status.hostIP

and then in the kubeletstats receiver

receivers:
  kubeletstats:
    endpoint: "${env:K8S_NODE_IP}:10250"

devurandom added bug Something isn't working needs triage New item requiring triage labels May 27, 2023

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prashant-shahi mentioned this issue Jun 13, 2023

k8s-infra-metrics not working in Digitalocean kubernetes (sigNoz v0.19.0) SigNoz/dashboards#13

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k8s_* metrics not showing in Digital Ocean K8s SigNoz/charts#178

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otel-agent: collect kubelet stats from host IP SigNoz/charts#380

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[collector] add node ip to kubeletstats open-telemetry/opentelemetry-helm-charts#1206

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kubeletstats receiver: "Get \"https://NODE_NAME:10250/stats/summary\": dial tcp: lookup NODE_NAME on 10.245.0.10:53: no such host" #22843

kubeletstats receiver: "Get \"https://NODE_NAME:10250/stats/summary\": dial tcp: lookup NODE_NAME on 10.245.0.10:53: no such host" #22843

devurandom commented May 27, 2023

github-actions bot commented May 27, 2023

github-actions bot commented Jul 27, 2023

devurandom commented Aug 29, 2023

crobert-1 commented Sep 27, 2023

devurandom commented Oct 1, 2023 •

edited

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paulohmorais commented Oct 11, 2023

jinja2 commented Oct 12, 2023

crobert-1 commented Oct 12, 2023

crobert-1 commented Oct 30, 2023

alextricity25 commented May 30, 2024

momenthana commented Jul 29, 2024

kubeletstats receiver: "Get \"https://NODE_NAME:10250/stats/summary\": dial tcp: lookup NODE_NAME on 10.245.0.10:53: no such host" #22843

kubeletstats receiver: "Get \"https://NODE_NAME:10250/stats/summary\": dial tcp: lookup NODE_NAME on 10.245.0.10:53: no such host" #22843

Comments

devurandom commented May 27, 2023

Component(s)

What happened?

Description

Steps to Reproduce

Expected Result

Actual Result

Collector version

Environment information

Environment

OpenTelemetry Collector configuration

Log output

Additional context

github-actions bot commented May 27, 2023

github-actions bot commented Jul 27, 2023

devurandom commented Aug 29, 2023

crobert-1 commented Sep 27, 2023

devurandom commented Oct 1, 2023 • edited Loading

paulohmorais commented Oct 11, 2023

jinja2 commented Oct 12, 2023

crobert-1 commented Oct 12, 2023

crobert-1 commented Oct 30, 2023

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