Custom DNS¶

There are two ways of overwriting the DNS server IP address used for all the internal and external DNS lookups. This is the equivalent of the --cluster-dns flag for the kubelet.

The first, is through the clusterDNS field. Config files accepts a string field called clusterDNS with the IP address of the DNS server to use. This will be passed to the kubelet that in turn will pass it to the pods through the /etc/resolv.conf file.

apiVersion: eksctl.io/v1alpha5
kind: ClusterConfig

metadata:
  name: cluster-1
  region: eu-north-1

nodeGroups:
- name: ng-1
  clusterDNS: 169.254.20.10

Note that this configuration only accepts one IP address. To specify more than one address, use the kubeletExtraConfig parameter:

apiVersion: eksctl.io/v1alpha5
kind: ClusterConfig

metadata:
  name: cluster-1
  region: eu-north-1

nodeGroups:
  - name: ng-1
    kubeletExtraConfig:
      clusterDNS: ["169.254.20.10","172.20.0.10"]