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support/azure/azure-kubernetes/connectivity/dns/basic-troubleshooting-dns-resolution-problems.md

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@@ -3,7 +3,7 @@ title: Basic troubleshooting of DNS resolution problems in AKS
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description: Learn how to create a troubleshooting workflow to fix DNS resolution problems in Azure Kubernetes Service (AKS).
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author: sturrent
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ms.author: seturren
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ms.date: 08/09/2024
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ms.date: 05/29/2025
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ms.reviewer: v-rekhanain, v-leedennis, josebl, v-weizhu, qasimsarfraz
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editor: v-jsitser
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ms.service: azure-kubernetes-service
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#### Part 3: Analyze DNS traffic and review DNS resolution performance
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Analyzing DNS traffic can help you understand how your AKS cluster handles the DNS queries. Ideally, you want to reproduce the problem on a test pod while you capture the traffic from this test pod and on each of the CoreDNS pods.
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Analyzing DNS traffic can help you understand how your AKS cluster handles the DNS queries. Ideally, you should reproduce the problem on a test pod while you capture the traffic from this test pod and on each of the CoreDNS pods.
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There are two main ways to analyze DNS traffic:
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kubectl gadget run trace_dns:$GADGET_VERSION --all-namespaces --fields "src,dst,name,qr,qtype,id,rcode,latency_ns"
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```
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Where `--fields` is a comma-separated list of fields to displayed. The following list describes the fields that are used in the command:
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Where `--fields` is a comma-separated list of fields to be displayed. The following list describes the fields that are used in the command:
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- `src`: The source of the request with Kubernetes information (`<kind>/<namespace>/<name>:<port>`).
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- `dst`: The destination of the request with Kubernetes information (`<kind>/<namespace>/<name>:<port>`).
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p/kube-system/coredns-57d886c994-r2… p/default/aks-test:56921 db.contoso.com. R A 6574 NameErr… 0ns
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```
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You can use the `ID` field to identify if a query has a response or not. The `RCODE` field shows you the response code of the DNS request. The `LATENCY_NS` field shows you the latency of the DNS request in nanoseconds. These fields can help you understand the health and performance of DNS responses.
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You can use the `ID` field to identify whether a query has a response. The `RCODE` field shows you the response code of the DNS request. The `LATENCY_NS` field shows you the latency of the DNS request in nanoseconds. These fields can help you understand the health and performance of DNS responses.
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For more information about real-time DNS analysis, see [Troubleshoot DNS failures across an AKS cluster in real time](troubleshoot-dns-failures-across-an-aks-cluster-in-real-time.md).
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##### Capture DNS traffic

support/azure/azure-kubernetes/toc.yml

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items:
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- name: Basic troubleshooting
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href: connectivity/dns/basic-troubleshooting-dns-resolution-problems.md
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- name: DNS Traffic analysis in real-time
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- name: DNS traffic analysis in real time
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href: connectivity/dns/troubleshoot-dns-failures-across-an-aks-cluster-in-real-time.md
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- name: Troubleshoot DNS from inside a pod
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href: connectivity/dns/troubleshoot-dns-failure-from-pod-but-not-from-worker-node.md

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