CoreDNS Description

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CCE CCE

  • Function Release Records
  • Common Tools
    • Command Line Scenario Examples
  • API Reference
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      • Impact Statement on runc Security Issue (CVE-2024-21626)
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    • Pod Anomaly Troubleshooting
    • Adding CGroup V2 Node
    • Common Linux System Configuration Parameters Description
    • Encrypting etcd Data Using KMS
    • Configuring Container Network Parameters Using CNI
    • CCE - Public Network Access Practice
    • Practice of using private images in CCE clusters
    • Unified Access for Virtual Machines and Container Services via CCE Ingress
    • User Guide for Custom CNI Plugins
    • CCE Cluster Network Description and Planning
    • Cross-Cloud Application Migration to Baidu CCE Using Velero
    • CCE Resource Recommender User Documentation
    • Continuous Deployment with Jenkins in CCE Cluster
    • CCE Best Practice-Guestbook Setup
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    • CCE Usage Checklist
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    • CCE Container Runtime Selection
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      • Deploy the TensorFlow Serving inference service
      • Best Practice for GPU Virtualization with Optimal Isolation
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  • CoreDNS Description
Table of contents on this page
  • Component introduction
  • Instructions for use
  • Limitations
  • Install component
  • Version records

CoreDNS Description

Updated at：2025-10-27

Component introduction

CoreDNS provides domain name resolution capabilities for internal services within a Kubernetes cluster. There is a corresponding relationship between CoreDNS version and Kubernetes version. When creating and upgrading your cluster, a compatible version of CoreDNS will be installed for you in accordance with the version correspondence specified in the CoreDNS version in Kubernetes. For more information about the version correspondence, please refer to CoreDNS version in Kubernetes.

Instructions for use

CoreDNS is configured in the kube-system namespace by default. For details on how to view and modify CoreDNS configuration items in a K8S Cluster CCE, please refer to Manual Upgrade Guide for CoreDNS Component. CoreDNS enables and configures plugins based on these configuration items. It should be emphasized that configuration items vary slightly across different CoreDNS versions. Before modifying configurations, please carefully read the Official CoreDNS Document and Manual Upgrade Guide for CoreDNS Component. The following is the default configuration file for CoreDNS version 1.20.3:

Plain Text 
1   .:53 {
2       errors
3       health {
4           lameduck 10s
5       }
6       ready
7       log
8       kubernetes {{.ClusterDomain}} in-addr.arpa ip6.arpa {
9           pods insecure
10           fallthrough in-addr.arpa ip6.arpa
11           ttl 30
12       }
13       prometheus :9153
14       forward . /etc/resolv.conf
15       cache 30
16       loop
17       reload
18       loadbalance
19   }

Description: In the configuration file, ClusterDomain refers to the local cluster domain name specified during cluster creation, with a default value of cluster.local.

Parameters Description
errors Error messages are directed to Stdout.
health CoreDNS reports health status and listens on port 8080 by default (usually used for health checks). Health status can be accessed via http://localhost:8080/health.
ready CoreDNS reports plugin status, listening on port 8181 by default (commonly used for readiness checks). Readiness status can be accessed via http://localhost:8181/ready. If all plugins are running, the status will show as 200.
kubernetes The CoreDNS Kubernetes plugin offers resolution for in-cluster services.
prometheus CoreDNS provides its own metrics data interface. Monitoring data in Prometheus format can be accessed via http://localhost:9153/metrics.
forward (or proxy) Forwards domain name queries to predefined DNS servers. By default, when the domain name isn't part of the Kubernetes domain, requests are forwarded to preconfigured resolvers (/etc/resolv.conf). The host's /etc/resolv.conf configuration is used by default.
cache Enables DNS caching.
loop Loop detection: If a loop is detected, CoreDNS will stop running.
reload Supports automatic reloading of updated Corefiles. After editing the ConfigMap configuration, allow up to two minutes for the changes to take effect.
loadbalance A round-robin DNS load balancer can randomize the order of A, AAAA, and MX records in its responses.

Limitations

CoreDNS is a system component. Since upgrades may cause cluster-wide resolution timeouts or failures within 5 minutes, automatic upgrades via the console are not supported temporarily. Please arrange the upgrade time reasonably and perform a manual upgrade.

Install component

CoreDNS is installed by default when creating a cluster, so there’s no need to handle the installation process yourself.

  • For K8S Cluster CCE with version ≥ 1.20, v1.20.2 is deployed by default, and the image version is 1.9.4-baidu
  • For K8S Cluster CCE with version < 1.20, v1.0.0 is deployed by default, and the image version is 1.7.1

Version records

Version No. Image version Cluster version compatibility Update time Update content Impact
1.20.4 1.9.4-baidu-1 CCE/v1.20/v1.22/v1.22/v1.26 2024.07.02 Disable wildcard query function --
1.20.3 1.9.4-baidu CCE/v1.20/v1.22/v1.22/v1.26 2024.02.06 Expose ConfigMap parameters --
1.20.2 1.9.4-baidu CCE/v1.20/v1.22/v1.22/v1.26 2024.01.08 Support high-version clusters --
1.0.0 1.7.1 CCE/v1.18 2022.06.21 First release --

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