tencent cloud

Note：

The entry for DNS Forward configuration is no longer available. The parameters of DNS Forward configured previously will be synced and updated in the Corefile of CoreDNS. If you want to modify the DNS service of the cluster, please refer to the following instructions or the directions of native Kubernetes CoreDNS.

Overview

This document describes how to modify the DNS service of a cluster through modifying the CoreDNS configuration file.

Prerequisites

You have created an serverless cluster. You need to select Deploy CoreDNS to allow the service discovery in the cluster in the advanced configuration at the time of creation.

Directions

Default Corefile configuration

When a CoreDNS is deployed in an serverless cluster, a Configmap is mounted by default to act as the CoreDNS configuration file (i.e. Corefile).
The default configuration of Corefile is as follows:

apiVersion: v1
kind: ConfigMap
metadata:
name: coredns
namespace: kube-system
data:
Corefile: |
  .:53 {
      errors
      health :8081
      kubernetes cluster.local in-addr.arpa ip6.arpa {
         pods insecure
         fallthrough in-addr.arpa ip6.arpa
         ttl 30
      }
      prometheus :9153
      forward . 183.60.83.19 183.60.82.98
      cache 30
      loop
      reload
      loadbalance
  }    

Each configuration item adopts the configuration of native Kubernetes. For details, see CoreDNS. Please note:

• forward：183.60.83.19, 183.60.82.98 is the default DNS address of Tencent Cloud.

Customize configuration of Corefile

You can modify ConfigMap of CoreDNS (i.e. Corefile) to modify relevant configuration of service discovery. The use method is consistent with that of the native kubernetes. For details, see Customizing DNS Service.