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Remove IPVS prerequisites 

Remove caution and replace with updated default
Add kube-apiserver feature-gates

Signed-off-by: Lachlan Evenson <lachlan.evenson@microsoft.com>
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Lachlan Evenson 2020-04-29 10:24:02 -07:00
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12
content/en/docs/concepts/services-networking/dual-stack.md
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@ -40,28 +40,24 @@ The following prerequisites are needed in order to utilize IPv4/IPv6 dual-stack
* Kubernetes 1.16 or later
* Provider support for dual-stack networking (Cloud provider or otherwise must be able to provide Kubernetes nodes with routable IPv4/IPv6 network interfaces)
* A network plugin that supports dual-stack (such as Kubenet or Calico)
* Kube-proxy running in mode IPVS
## Enable IPv4/IPv6 dual-stack
To enable IPv4/IPv6 dual-stack, enable the `IPv6DualStack` [feature gate](/docs/reference/command-line-tools-reference/feature-gates/) for the relevant components of your cluster, and set dual-stack cluster network assignments:
* kube-apiserver:
* `--feature-gates="IPv6DualStack=true"`
* kube-controller-manager:
* `--feature-gates="IPv6DualStack=true"`
* `--cluster-cidr=<IPv4 CIDR>,<IPv6 CIDR>` eg. `--cluster-cidr=10.244.0.0/16,fc00::/24`
* `--service-cluster-ip-range=<IPv4 CIDR>,<IPv6 CIDR>`
* `--cluster-cidr=<IPv4 CIDR>,<IPv6 CIDR>` eg. `--cluster-cidr=10.244.0.0/16,fc00::/48`
* `--service-cluster-ip-range=<IPv4 CIDR>,<IPv6 CIDR>` eg. `--service-cluster-ip-range=10.0.0.0/16,fd00::/108`
* `--node-cidr-mask-size-ipv4|--node-cidr-mask-size-ipv6` defaults to /24 for IPv4 and /64 for IPv6
* kubelet:
* `--feature-gates="IPv6DualStack=true"`
* kube-proxy:
* `--proxy-mode=ipvs`
* `--cluster-cidr=<IPv4 CIDR>,<IPv6 CIDR>`
* `--feature-gates="IPv6DualStack=true"`
{{< caution >}}
If you specify an IPv6 address block larger than a /24 via `--cluster-cidr` on the command line, that assignment will fail.
{{< /caution >}}
## Services
If your cluster has IPv4/IPv6 dual-stack networking enabled, you can create {{< glossary_tooltip text="Services" term_id="service" >}} with either an IPv4 or an IPv6 address. You can choose the address family for the Service's cluster IP by setting a field, `.spec.ipFamily`, on that Service.