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How to create Kubernetes DNS service without reinitializing the k8s cluster?

I have accidentally deleted the K8S DNS service and now name resolution is not working between pods and services.

Pods are not able to reach other pods through service.

So is there a way to recreate the K8S DNS service without reinitializing the K8S cluster?

I tried the below spec but it's throwing some errors.

---
apiVersion: v1
kind: Service
metadata:
  name: kube-dns
  namespace: kube-system
  annotations:
    prometheus.io/port: "9153"
    prometheus.io/scrape: "true"
  labels:
    k8s-app: kube-dns
    kubernetes.io/cluster-service: "true"
    addonmanager.kubernetes.io/mode: Reconcile
    kubernetes.io/name: "CoreDNS"
spec:
  selector:
    k8s-app: kube-dns
  clusterIP: {{.ClusterDNSServer}}
  ports:
  - name: dns
    port: 53
    protocol: UDP
  - name: dns-tcp
    port: 53
    protocol: TCP
  - name: metrics
    port: 9153
    protocol: TCP

Error message when I tried to deploy this spec

error: error parsing coredns-svc.yaml: error converting YAML to JSON: yaml: invalid map key: map[interface {}]interface {}{".ClusterDNSServer":interface {}(nil)}

So is this spec the right way to recreate the K8S DNS service and if yes what's wrong with the spec?

devops-admin
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  • The ClusterIP should be an IP address - should be that you would find in /etc/resolv.conf for your pods. The snippet you shared here is a template, not meant to be applied directly / should set that {{.ClusterDNSServer}} thing. – SYN Aug 28 '22 at 14:37

0 Answers0