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How to bring up the Kubernetes dual stack support?

Prerequisites

• You must be using Kubernetes 1.16 (alpha feature) or later (1.20 beta feature).
• IPv6 and IPv6 forwarding must be enabled (:

  sysctl -w net.ipv6.conf.all.disable_ipv6=0

  ,

  
  sysctl -w net.ipv6.conf.all.forwarding=1

  )

• All the nodes must have an IPv6 address and they should be able to reach others over an IPv6 connection.
  Tip: IPv6 address can be manually assigned to interface via adding in netplan configuration files :
  Edit netplan configuration file (/etc/netplan/50-vagrant.yaml). Add IPv6 address to list of addresses and setting set in interface section:

  accept-ra: no

  After that netplan apply needs to be called.

...

• Following parameters need to be added to kubeadm init command:

  kube
  -
  controller
  -
  manager–
  pod-
  feature
  network-
  gates="IPv6DualStack=true"
  –-cluster-cidr=<IPv4 CIDR>,<IPv6 CIDR>
  –-service-cluster-ip-range=<IPv4 CIDR>,<IPv6 CIDR>
  kubelet–
  cidr=10.233.64.0/18,2001:db8:1234:5678:8:2::/64 \
  --apiserver-advertise-address=192.168.121.3 \
  --service-cidr=10.96.0.0/12,2001:db8:1234:5678:8:3::/108 \
  --feature-gates=
  "
  IPv6DualStack=true
  "
   \
  kube
  -
  proxy–
  -
  proxy-mode=ipvs
  –-cluster-cidrs=<IPv4 CIDR>,<IPv6 CIDR>
  –-feature-gates="IPv6DualStack=true"
  apiserver-advertise-address=10.10.10.13