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DNSChaos Experiment

This document describes how to create DNSChaos experiments in Chaos Mesh.

DNSChaos allows you to simulate fault DNS responses such as a DNS error or a random IP address after a request is sent.

Deploy DNS service for chaos

To create DNSChaos experiments in Chaos Mesh, you need to deploy a DNS service in Chaos Mesh by executing the command below:

When the deployment finishes, check the status of this DNS service:

kubectl get pods -n chaos-testing -l

Make sure the Pod's STATUS is Running.

Configuration file

Below is a sample DNSChaos configuration file:

kind: DNSChaos
name: busybox-dns-chaos
action: random
- chaos-mesh.*
- github.?om
mode: all
- busybox
duration: '90s'
cron: '@every 100s'

For more sample files, see examples. You can edit them as needed.

Fields description

  • action: Defines the chaos action for DNSChaos. Supported actions are:

    • error - Get an error when sending the DNS request
    • random - Get a random IP when sending the DNS request
  • patterns: Choose which domain names to take effect, support the placeholder ? and wildcard *, or the specified domain name.

    • The wildcard _ must be at the end of the string. For example, is invalid.
    • If the patterns is empty, will take effect on all the domain names.
  • selector: Specifies the target pods for chaos injection. For more details, see Define the Scope of Chaos Experiment.


  • Currently, DNSChaos only supports record types A and AAAA.

  • The chaos DNS service runs CoreDNS with the k8s_dns_chaos plugin. If the CoreDNS service in your Kubernetes cluster contains some special configurations, you can edit configMap dns-server-config to make the configuration of the chaos DNS service consistent with that of the K8s CoreDNS service as shown below:

    kubectl edit configmap dns-server-config -n chaos-testing