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48d4973957
* Define a dual-stack virtual network with both IPv4 and IPv6 private
address space. Change `host_cidr` variable (string) to a `network_cidr`
variable (object) with "ipv4" and "ipv6" fields that list CIDR strings.
* Define dual-stack controller and worker subnets. Disable Azure
default outbound access (a deprecated fallback mechanism)
* Enable dual-stack load balancing to Kubernetes Ingress by adding
a public IPv6 frontend IP and LB rule to the load balancer.
* Enable worker outbound IPv6 connectivity through load balancer
SNAT by adding an IPv6 frontend IP and outbound rule
* Configure controller nodes with a public IPv6 address to provide
direct outbound IPv6 connectivity
* Add an IPv6 worker backend pool. Azure requires separate IPv4 and
IPv6 backend pools, though the health probe can be shared
* Extend network security group rules for IPv6 source/destinations
Checklist:
Access to controller and worker nodes via IPv6 addresses:
* SSH access to controller nodes via public IPv6 address
* SSH access to worker nodes via (private) IPv6 address (via
controller)
Outbound IPv6 connectivity from controller and worker nodes:
```
nc -6 -zv ipv6.google.com 80
Ncat: Version 7.94 ( https://nmap.org/ncat )
Ncat: Connected to [2607:f8b0:4001:c16::66]:80.
Ncat: 0 bytes sent, 0 bytes received in 0.02 seconds.
```
Serve Ingress traffic via IPv4 or IPv6 just requires setting
up A and AAAA records and running the ingress controller with
`hostNetwork: true` since, hostPort only forwards IPv4 traffic
70 lines
2.3 KiB
HCL
70 lines
2.3 KiB
HCL
locals {
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# Subdivide the virtual network into subnets
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# - controllers use netnum 0
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# - workers use netnum 1
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controller_subnets = {
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ipv4 = [for i, cidr in var.network_cidr.ipv4 : cidrsubnet(cidr, 1, 0)]
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ipv6 = [for i, cidr in var.network_cidr.ipv6 : cidrsubnet(cidr, 16, 0)]
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}
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worker_subnets = {
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ipv4 = [for i, cidr in var.network_cidr.ipv4 : cidrsubnet(cidr, 1, 1)]
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ipv6 = [for i, cidr in var.network_cidr.ipv6 : cidrsubnet(cidr, 16, 1)]
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}
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cluster_subnets = {
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ipv4 = concat(local.controller_subnets.ipv4, local.worker_subnets.ipv4)
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ipv6 = concat(local.controller_subnets.ipv6, local.worker_subnets.ipv6)
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}
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}
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# Organize cluster into a resource group
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resource "azurerm_resource_group" "cluster" {
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name = var.cluster_name
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location = var.region
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}
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resource "azurerm_virtual_network" "network" {
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name = var.cluster_name
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resource_group_name = azurerm_resource_group.cluster.name
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location = azurerm_resource_group.cluster.location
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address_space = concat(
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var.network_cidr.ipv4,
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var.network_cidr.ipv6
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)
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}
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# Subnets - separate subnets for controllers and workers because Azure
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# network security groups are oriented around address prefixes rather
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# than instance tags (GCP) or security group membership (AWS)
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resource "azurerm_subnet" "controller" {
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name = "controller"
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resource_group_name = azurerm_resource_group.cluster.name
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virtual_network_name = azurerm_virtual_network.network.name
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address_prefixes = concat(
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local.controller_subnets.ipv4,
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local.controller_subnets.ipv6,
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)
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default_outbound_access_enabled = false
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}
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resource "azurerm_subnet_network_security_group_association" "controller" {
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subnet_id = azurerm_subnet.controller.id
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network_security_group_id = azurerm_network_security_group.controller.id
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}
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resource "azurerm_subnet" "worker" {
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name = "worker"
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resource_group_name = azurerm_resource_group.cluster.name
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virtual_network_name = azurerm_virtual_network.network.name
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address_prefixes = concat(
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local.worker_subnets.ipv4,
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local.worker_subnets.ipv6,
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)
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default_outbound_access_enabled = false
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}
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resource "azurerm_subnet_network_security_group_association" "worker" {
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subnet_id = azurerm_subnet.worker.id
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network_security_group_id = azurerm_network_security_group.worker.id
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}
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