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AKS CoreDNS + Azure Prometheus - can't see metrics in log analytics #1364

rhollins opened this issue Dec 23, 2019 · 3 comments

AKS CoreDNS + Azure Prometheus - can't see metrics in log analytics #1364

rhollins opened this issue Dec 23, 2019 · 3 comments


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@rhollins rhollins commented Dec 23, 2019

I applied following oms config as configmap and only changed this row:
monitor_kubernetes_pods = true

I can see metrics config when running curl on coredns pod:
dnstools# curl http://<coredns_pod_ip>:9153/metrics

I also deployed nginx ingress controller and can see it's metrics just fine in log analytics

I'm using following Kusto command to check for metrics:

| order by TimeGenerated desc 
| where Namespace contains "prometheus"


  • Kubernetes version (use kubectl version):
    kubectl version
    Client Version: version.Info{Major:"1", Minor:"15", GitVersion:"v1.15.3", GitCommit:"2d3c76f9091b6bec110a5e63777c332469e0cba2", GitTreeState:"clean", BuildDate:"2019-08-19T11:13:54Z", GoVersion:"go1.12.9", Compiler:"gc", Platform:"linux/amd64"}
    Server Version: version.Info{Major:"1", Minor:"14", GitVersion:"v1.14.8", GitCommit:"1da9875156ba0ad48e7d09a5d00e41489507f592", GitTreeState:"clean", BuildDate:"2019-11-14T05:19:20Z", GoVersion:"go1.12.10", Compiler:"gc", Platform:"linux/amd64"}
  • Size of cluster (how many worker nodes are in the cluster?)
  • General description of workloads in the cluster (e.g. HTTP microservices, Java app, Ruby on Rails, machine learning, etc.)
  • Others:
@triage-new-issues triage-new-issues bot added the triage label Dec 23, 2019

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@esHack esHack commented Dec 31, 2019

Also have the same issue

Seeing these logs on oms agent

  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0

****************Start Config Processing********************

Both stdout & stderr log collection are turned off for namespaces: '*_kube-system_*.log'

****************End Config Processing********************

****************Start Prometheus Config Processing********************

config::No configmap mounted for prometheus custom config, using defaults

****************End Prometheus Config Processing********************

Workspace f4aa9866-223b-4a7a-9363-323 already onboarded and agent is running.

Seems like not finding prometheus config map


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@devteng devteng commented Jan 22, 2020

I solve this in AKS for a adhoc deployment of Prometheus. My problem was that CoreDNS metrics were not being scraped by Prometheus. I was able to get atleast the in cluster deployment of Prometheus by adding "true" annotation to the coredns deployment under .spec.template.metadata.annotations. Adding the annotation will causes the deployment to perform a rolling update. This change would be lost on the next CoreDNS upgrade if this is not fixed by Azure.

kind: Deployment
  name: coredns
  namespace: kube-system
      annotations: "9153" "true"

Previously, only "9153" was in the annotations. "true" was not.

This may/may not work for this issue. Putting the solution out there in hopes that it helps. but this is not a permanent solution. The awesome AKS team would have to fix it.


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@atikhono atikhono commented Feb 18, 2020

I have bumped into this as well.

To have metrics sent to Azure Monitor, we need to add "true" annotation to CoreDNS deployment (sarcastically, neither of tools we use to deploy on Azure support settings annotations on existing k8s objects -- but kubectl, which is not desirable for us). Alternatively, we could tell OMS agent the list of URLs to scrape from. But kube-dns service doesn't expose Prometheus endpoint.

Would be cool to have CoreDNS metrics sent to ContainerInsights out of box.

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