kubernetes - coredns has no ipv6 service record?

Question

I have just deployed kubernetes v1.20 and enable dualstack for testing. Here is my init.yaml

apiVersion: kubeadm.k8s.io/v1beta2
bootstrapTokens:
- groups:
  - system:bootstrappers:kubeadm:default-node-token
  token: abcdef.0123456789abcdef
  ttl: 24h0m0s
  usages:
  - signing
  - authentication
kind: InitConfiguration
localAPIEndpoint:
  advertiseAddress: 10.0.2.2
  bindPort: 6443
nodeRegistration:
  criSocket: /var/run/dockershim.sock
  name: abc
  taints:
  - effect: PreferNoSchedule
    key: node-role.kubernetes.io/master
---

apiVersion: kubeadm.k8s.io/v1beta2
certificatesDir: /etc/kubernetes/pki
clusterName: kubernetes
dns:
  type: CoreDNS
etcd:
  local:
    dataDir: /var/lib/etcd
imageRepository: k8s.gcr.io
kind: ClusterConfiguration
kubernetesVersion: v1.20.0
featureGates: 
  IPv6DualStack: true
networking:
  dnsDomain: cluster.local
  serviceSubnet: "10.244.0.0/16,eeef::/112"
apiServer:
  timeoutForControlPlane: 1m40s
  extraArgs:
    feature-gates: "IPv6DualStack=true"
    service-cluster-ip-range: "10.244.0.0/16,eeef::/112"
controllerManager:
  extraArgs:
    feature-gates: "IPv6DualStack=true"
    cluster-cidr: "10.245.0.0/16,eeee::/112"
    service-cluster-ip-range: "10.244.0.0/16,eeef::/112"
scheduler:
  extraArgs:
    feature-gates: "IPv6DualStack=true"

---
apiVersion: kubeproxy.config.k8s.io/v1alpha1
kind: KubeProxyConfiguration
clusterCIDR: "10.245.0.0/16,eeee::/112"
featureGates: 
  IPv6DualStack: true

I use calico and enable dualstack as well. Everything seems OK during deploying. But ipv6 fails to be resolved. My svc is like:

spec:
  clusterIP: 10.244.24.87
  clusterIPs:
  - 10.244.24.87
  - eeef::50b
  ipFamilies:
  - IPv4
  - IPv6
  ipFamilyPolicy: PreferDualStack
  ports:
  - port: 80
    protocol: TCP
    targetPort: 80
  selector:
    app: busybox1
  sessionAffinity: None
  type: ClusterIP

It has dualstack ip.When I ping the svc, it can be resolved to ipv4 svc address. But ping6 failed. No useful info is found with coredns log. Any tips?

Answer 1

等待大神答复