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Changes to support Dual Stack networking

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This commit is contained in:
Matt Calvert
2020-10-26 07:10:53 +00:00
committed by Kubernetes Prow Robot
parent ba731ed145
commit 4cc065e66d
12 changed files with 151 additions and 8 deletions
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7
docs/calico.md
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@@ -58,13 +58,14 @@ To re-define you need to edit the inventory and add a group variable `calico_net
calico_network_backend: none
```
### Optional : Define the default pool CIDR
### Optional : Define the default pool CIDRs
By default, `kube_pods_subnet` is used as the IP range CIDR for the default IP Pool.
In some cases you may want to add several pools and not have them considered by Kubernetes as external (which means that they must be within or equal to the range defined in `kube_pods_subnet`), it starts with the default IP Pool of which IP range CIDR can by defined in group_vars (k8s-cluster/k8s-net-calico.yml):
By default, `kube_pods_subnet` is used as the IP range CIDR for the default IP Pool, and `kube_pods_subnet_ipv6` for IPv6.
In some cases you may want to add several pools and not have them considered by Kubernetes as external (which means that they must be within or equal to the range defined in `kube_pods_subnet` and `kube_pods_subnet_ipv6` ), it starts with the default IP Pools of which IP range CIDRs can by defined in group_vars (k8s-cluster/k8s-net-calico.yml):
```ShellSession
calico_pool_cidr: 10.233.64.0/20
calico_pool_cidr_ipv6: fd85:ee78:d8a6:8607::1:0000/112
```
### Optional : BGP Peering with border routers

8
docs/vars.md
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@@ -62,6 +62,10 @@ following default cluster parameters:
raise an assertion in playbooks if the `kubelet_max_pods` var also isn't adjusted accordingly
(assertion not applicable to calico which doesn't use this as a hard limit, see
[Calico IP block sizes](https://docs.projectcalico.org/reference/resources/ippool#block-sizes).
* *enable_dual_stack_networks* - Setting this to true will provision both IPv4 and IPv6 networking for pods and services.
* *kube_service_addresses_ipv6* - Subnet for cluster IPv6 IPs (default is ``fd85:ee78:d8a6:8607::1000/116``). Must not overlap with ``kube_pods_subnet_ipv6``.
* *kube_pods_subnet_ipv6* - Subnet for Pod IPv6 IPs (default is ``fd85:ee78:d8a6:8607::1:0000/112``). Must not overlap with ``kube_service_addresses_ipv6``.
* *kube_network_node_prefix_ipv6* - Subnet allocated per-node for pod IPv6 IPs. Remaining bits in ``kube_pods_subnet_ipv6`` dictates how many kube-nodes can be in cluster.
* *skydns_server* - Cluster IP for DNS (default is 10.233.0.3)
* *skydns_server_secondary* - Secondary Cluster IP for CoreDNS used with coredns_dual deployment (default is 10.233.0.4)
* *enable_coredns_k8s_external* - If enabled, it configures the [k8s_external plugin](https://coredns.io/plugins/k8s_external/)
@@ -87,6 +91,10 @@ Note, if cloud providers have any use of the ``10.233.0.0/16``, like instances'
private addresses, make sure to pick another values for ``kube_service_addresses``
and ``kube_pods_subnet``, for example from the ``172.18.0.0/16``.
## Enabling Dual Stack (IPV4 + IPV6) networking
If *enable_dual_stack_networks* is set to ``true``, Dual Stack networking will be enabled in the cluster. This will use the default IPv4 and IPv6 subnets specified in the defaults file in the ``kubespray-defaults`` role, unless overridden of course. The default config will give you room for up to 256 nodes with 126 pods per node, and up to 4096 services.
## DNS variables
By default, hosts are set up with 8.8.8.8 as an upstream DNS server and all