This is a Kubernetes mutating webhook to manipulate dnsConfig and dnsPolicy dynamically.
If dnsPolicy is not specified or is set as ClusterFirst, the pod creation request is intercepted and mutated as the following:
dnsConfig:
nameservers:
- 169.254.25.10
options:
- name: timeout
value: "1"
- name: ndots
value: "2"
- name: attempts
value: "1"
searches:
- svc.dev-team
dnsPolicy: None
Ndots, attempts and timeout values can be given as environment variables of the backend container. Since this architecture is designed for a cluster that uses nodelocalDNS, nodelocalDNS_IP should be set as an environment variable too. Backend reads clusterDomain which is assumed to be the same as the cluster name from the cluster-info configmap or alternatively it can read clusterDomain from kubelet-config.
Namespaces which is wanted to be excluded can be given in the configmap
