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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
477 lines
20 KiB
HCL
477 lines
20 KiB
HCL
# Controller security group
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resource "azurerm_network_security_group" "controller" {
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name = "${var.cluster_name}-controller"
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resource_group_name = azurerm_resource_group.cluster.name
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location = azurerm_resource_group.cluster.location
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}
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resource "azurerm_network_security_rule" "controller-icmp" {
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for_each = local.controller_subnets
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name = "allow-icmp-${each.key}"
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resource_group_name = azurerm_resource_group.cluster.name
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network_security_group_name = azurerm_network_security_group.controller.name
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priority = 1995 + (each.key == "ipv4" ? 0 : 1)
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access = "Allow"
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direction = "Inbound"
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protocol = "Icmp"
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source_port_range = "*"
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destination_port_range = "*"
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source_address_prefixes = local.cluster_subnets[each.key]
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destination_address_prefixes = local.controller_subnets[each.key]
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}
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resource "azurerm_network_security_rule" "controller-ssh" {
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for_each = local.controller_subnets
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name = "allow-ssh-${each.key}"
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resource_group_name = azurerm_resource_group.cluster.name
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network_security_group_name = azurerm_network_security_group.controller.name
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priority = 2000 + (each.key == "ipv4" ? 0 : 1)
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access = "Allow"
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direction = "Inbound"
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protocol = "Tcp"
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source_port_range = "*"
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destination_port_range = "22"
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source_address_prefix = "*"
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destination_address_prefixes = local.controller_subnets[each.key]
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}
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resource "azurerm_network_security_rule" "controller-etcd" {
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for_each = local.controller_subnets
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name = "allow-etcd-${each.key}"
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resource_group_name = azurerm_resource_group.cluster.name
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network_security_group_name = azurerm_network_security_group.controller.name
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priority = 2005 + (each.key == "ipv4" ? 0 : 1)
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access = "Allow"
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direction = "Inbound"
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protocol = "Tcp"
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source_port_range = "*"
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destination_port_range = "2379-2380"
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source_address_prefixes = local.controller_subnets[each.key]
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destination_address_prefixes = local.controller_subnets[each.key]
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}
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# Allow Prometheus to scrape etcd metrics
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resource "azurerm_network_security_rule" "controller-etcd-metrics" {
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for_each = local.controller_subnets
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name = "allow-etcd-metrics-${each.key}"
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resource_group_name = azurerm_resource_group.cluster.name
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network_security_group_name = azurerm_network_security_group.controller.name
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priority = 2010 + (each.key == "ipv4" ? 0 : 1)
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access = "Allow"
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direction = "Inbound"
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protocol = "Tcp"
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source_port_range = "*"
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destination_port_range = "2381"
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source_address_prefixes = local.worker_subnets[each.key]
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destination_address_prefixes = local.controller_subnets[each.key]
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}
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# Allow Prometheus to scrape kube-proxy metrics
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resource "azurerm_network_security_rule" "controller-kube-proxy" {
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for_each = local.controller_subnets
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name = "allow-kube-proxy-metrics-${each.key}"
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resource_group_name = azurerm_resource_group.cluster.name
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network_security_group_name = azurerm_network_security_group.controller.name
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priority = 2012 + (each.key == "ipv4" ? 0 : 1)
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access = "Allow"
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direction = "Inbound"
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protocol = "Tcp"
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source_port_range = "*"
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destination_port_range = "10249"
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source_address_prefixes = local.worker_subnets[each.key]
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destination_address_prefixes = local.controller_subnets[each.key]
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}
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# Allow Prometheus to scrape kube-scheduler and kube-controller-manager metrics
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resource "azurerm_network_security_rule" "controller-kube-metrics" {
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for_each = local.controller_subnets
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name = "allow-kube-metrics-${each.key}"
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resource_group_name = azurerm_resource_group.cluster.name
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network_security_group_name = azurerm_network_security_group.controller.name
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priority = 2014 + (each.key == "ipv4" ? 0 : 1)
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access = "Allow"
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direction = "Inbound"
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protocol = "Tcp"
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source_port_range = "*"
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destination_port_range = "10257-10259"
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source_address_prefixes = local.worker_subnets[each.key]
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destination_address_prefixes = local.controller_subnets[each.key]
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}
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resource "azurerm_network_security_rule" "controller-apiserver" {
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for_each = local.controller_subnets
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name = "allow-apiserver-${each.key}"
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resource_group_name = azurerm_resource_group.cluster.name
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network_security_group_name = azurerm_network_security_group.controller.name
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priority = 2016 + (each.key == "ipv4" ? 0 : 1)
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access = "Allow"
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direction = "Inbound"
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protocol = "Tcp"
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source_port_range = "*"
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destination_port_range = "6443"
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source_address_prefix = "*"
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destination_address_prefixes = local.controller_subnets[each.key]
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}
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resource "azurerm_network_security_rule" "controller-cilium-health" {
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for_each = var.networking == "cilium" ? local.controller_subnets : {}
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name = "allow-cilium-health-${each.key}"
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resource_group_name = azurerm_resource_group.cluster.name
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network_security_group_name = azurerm_network_security_group.controller.name
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priority = 2018 + (each.key == "ipv4" ? 0 : 1)
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access = "Allow"
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direction = "Inbound"
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protocol = "Tcp"
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source_port_range = "*"
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destination_port_range = "4240"
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source_address_prefixes = local.cluster_subnets[each.key]
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destination_address_prefixes = local.controller_subnets[each.key]
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}
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resource "azurerm_network_security_rule" "controller-cilium-metrics" {
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for_each = var.networking == "cilium" ? local.controller_subnets : {}
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name = "allow-cilium-metrics-${each.key}"
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resource_group_name = azurerm_resource_group.cluster.name
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network_security_group_name = azurerm_network_security_group.controller.name
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priority = 2035 + (each.key == "ipv4" ? 0 : 1)
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access = "Allow"
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direction = "Inbound"
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protocol = "Tcp"
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source_port_range = "*"
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destination_port_range = "9962-9965"
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source_address_prefixes = local.cluster_subnets[each.key]
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destination_address_prefixes = local.controller_subnets[each.key]
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}
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resource "azurerm_network_security_rule" "controller-vxlan" {
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for_each = local.controller_subnets
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name = "allow-vxlan-${each.key}"
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resource_group_name = azurerm_resource_group.cluster.name
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network_security_group_name = azurerm_network_security_group.controller.name
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priority = 2020 + (each.key == "ipv4" ? 0 : 1)
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access = "Allow"
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direction = "Inbound"
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protocol = "Udp"
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source_port_range = "*"
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destination_port_range = "4789"
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source_address_prefixes = local.cluster_subnets[each.key]
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destination_address_prefixes = local.controller_subnets[each.key]
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}
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resource "azurerm_network_security_rule" "controller-linux-vxlan" {
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for_each = local.controller_subnets
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name = "allow-linux-vxlan-${each.key}"
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resource_group_name = azurerm_resource_group.cluster.name
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network_security_group_name = azurerm_network_security_group.controller.name
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priority = 2022 + (each.key == "ipv4" ? 0 : 1)
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access = "Allow"
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direction = "Inbound"
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protocol = "Udp"
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source_port_range = "*"
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destination_port_range = "8472"
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source_address_prefixes = local.cluster_subnets[each.key]
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destination_address_prefixes = local.controller_subnets[each.key]
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}
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# Allow Prometheus to scrape node-exporter daemonset
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resource "azurerm_network_security_rule" "controller-node-exporter" {
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for_each = local.controller_subnets
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name = "allow-node-exporter-${each.key}"
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resource_group_name = azurerm_resource_group.cluster.name
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network_security_group_name = azurerm_network_security_group.controller.name
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priority = 2025 + (each.key == "ipv4" ? 0 : 1)
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access = "Allow"
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direction = "Inbound"
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protocol = "Tcp"
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source_port_range = "*"
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destination_port_range = "9100"
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source_address_prefixes = local.worker_subnets[each.key]
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destination_address_prefixes = local.controller_subnets[each.key]
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}
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# Allow apiserver to access kubelet's for exec, log, port-forward
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resource "azurerm_network_security_rule" "controller-kubelet" {
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for_each = local.controller_subnets
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name = "allow-kubelet-${each.key}"
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resource_group_name = azurerm_resource_group.cluster.name
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network_security_group_name = azurerm_network_security_group.controller.name
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priority = 2030 + (each.key == "ipv4" ? 0 : 1)
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access = "Allow"
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direction = "Inbound"
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protocol = "Tcp"
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source_port_range = "*"
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destination_port_range = "10250"
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# allow Prometheus to scrape kubelet metrics too
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source_address_prefixes = local.cluster_subnets[each.key]
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destination_address_prefixes = local.controller_subnets[each.key]
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}
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# Override Azure AllowVNetInBound and AllowAzureLoadBalancerInBound
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# https://docs.microsoft.com/en-us/azure/virtual-network/security-overview#default-security-rules
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resource "azurerm_network_security_rule" "controller-allow-loadblancer" {
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resource_group_name = azurerm_resource_group.cluster.name
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name = "allow-loadbalancer"
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network_security_group_name = azurerm_network_security_group.controller.name
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priority = "3000"
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access = "Allow"
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direction = "Inbound"
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protocol = "*"
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source_port_range = "*"
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destination_port_range = "*"
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source_address_prefix = "AzureLoadBalancer"
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destination_address_prefix = "*"
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}
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resource "azurerm_network_security_rule" "controller-deny-all" {
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resource_group_name = azurerm_resource_group.cluster.name
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name = "deny-all"
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network_security_group_name = azurerm_network_security_group.controller.name
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priority = "3005"
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access = "Deny"
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direction = "Inbound"
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protocol = "*"
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source_port_range = "*"
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destination_port_range = "*"
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source_address_prefix = "*"
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destination_address_prefix = "*"
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}
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# Worker security group
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resource "azurerm_network_security_group" "worker" {
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name = "${var.cluster_name}-worker"
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resource_group_name = azurerm_resource_group.cluster.name
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location = azurerm_resource_group.cluster.location
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}
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resource "azurerm_network_security_rule" "worker-icmp" {
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for_each = local.worker_subnets
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name = "allow-icmp-${each.key}"
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resource_group_name = azurerm_resource_group.cluster.name
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network_security_group_name = azurerm_network_security_group.worker.name
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priority = 1995 + (each.key == "ipv4" ? 0 : 1)
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access = "Allow"
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direction = "Inbound"
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protocol = "Icmp"
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source_port_range = "*"
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destination_port_range = "*"
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source_address_prefixes = local.cluster_subnets[each.key]
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destination_address_prefixes = local.worker_subnets[each.key]
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}
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resource "azurerm_network_security_rule" "worker-ssh" {
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for_each = local.worker_subnets
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name = "allow-ssh-${each.key}"
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resource_group_name = azurerm_resource_group.cluster.name
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network_security_group_name = azurerm_network_security_group.worker.name
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priority = 2000 + (each.key == "ipv4" ? 0 : 1)
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access = "Allow"
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direction = "Inbound"
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protocol = "Tcp"
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source_port_range = "*"
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destination_port_range = "22"
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source_address_prefixes = local.controller_subnets[each.key]
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destination_address_prefixes = local.worker_subnets[each.key]
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}
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resource "azurerm_network_security_rule" "worker-http" {
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for_each = local.worker_subnets
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name = "allow-http-${each.key}"
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resource_group_name = azurerm_resource_group.cluster.name
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network_security_group_name = azurerm_network_security_group.worker.name
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priority = 2005 + (each.key == "ipv4" ? 0 : 1)
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access = "Allow"
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direction = "Inbound"
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protocol = "Tcp"
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source_port_range = "*"
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destination_port_range = "80"
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source_address_prefix = "*"
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destination_address_prefixes = local.worker_subnets[each.key]
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}
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resource "azurerm_network_security_rule" "worker-https" {
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for_each = local.worker_subnets
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name = "allow-https-${each.key}"
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resource_group_name = azurerm_resource_group.cluster.name
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network_security_group_name = azurerm_network_security_group.worker.name
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priority = 2010 + (each.key == "ipv4" ? 0 : 1)
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access = "Allow"
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direction = "Inbound"
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protocol = "Tcp"
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source_port_range = "*"
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destination_port_range = "443"
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source_address_prefix = "*"
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destination_address_prefixes = local.worker_subnets[each.key]
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}
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resource "azurerm_network_security_rule" "worker-cilium-health" {
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for_each = var.networking == "cilium" ? local.worker_subnets : {}
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name = "allow-cilium-health-${each.key}"
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resource_group_name = azurerm_resource_group.cluster.name
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network_security_group_name = azurerm_network_security_group.worker.name
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priority = 2012 + (each.key == "ipv4" ? 0 : 1)
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access = "Allow"
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direction = "Inbound"
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protocol = "Tcp"
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source_port_range = "*"
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destination_port_range = "4240"
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source_address_prefixes = local.cluster_subnets[each.key]
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destination_address_prefixes = local.worker_subnets[each.key]
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}
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resource "azurerm_network_security_rule" "worker-cilium-metrics" {
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for_each = var.networking == "cilium" ? local.worker_subnets : {}
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name = "allow-cilium-metrics-${each.key}"
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resource_group_name = azurerm_resource_group.cluster.name
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network_security_group_name = azurerm_network_security_group.worker.name
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priority = 2014 + (each.key == "ipv4" ? 0 : 1)
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access = "Allow"
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direction = "Inbound"
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protocol = "Tcp"
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source_port_range = "*"
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destination_port_range = "9962-9965"
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source_address_prefixes = local.cluster_subnets[each.key]
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destination_address_prefixes = local.worker_subnets[each.key]
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}
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resource "azurerm_network_security_rule" "worker-vxlan" {
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for_each = local.worker_subnets
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name = "allow-vxlan-${each.key}"
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resource_group_name = azurerm_resource_group.cluster.name
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network_security_group_name = azurerm_network_security_group.worker.name
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priority = 2016 + (each.key == "ipv4" ? 0 : 1)
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access = "Allow"
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direction = "Inbound"
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protocol = "Udp"
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source_port_range = "*"
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destination_port_range = "4789"
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source_address_prefixes = local.cluster_subnets[each.key]
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destination_address_prefixes = local.worker_subnets[each.key]
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}
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resource "azurerm_network_security_rule" "worker-linux-vxlan" {
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for_each = local.worker_subnets
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name = "allow-linux-vxlan-${each.key}"
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resource_group_name = azurerm_resource_group.cluster.name
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network_security_group_name = azurerm_network_security_group.worker.name
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priority = 2018 + (each.key == "ipv4" ? 0 : 1)
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access = "Allow"
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direction = "Inbound"
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protocol = "Udp"
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source_port_range = "*"
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destination_port_range = "8472"
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source_address_prefixes = local.cluster_subnets[each.key]
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destination_address_prefixes = local.worker_subnets[each.key]
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}
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# Allow Prometheus to scrape node-exporter daemonset
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resource "azurerm_network_security_rule" "worker-node-exporter" {
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for_each = local.worker_subnets
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name = "allow-node-exporter-${each.key}"
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resource_group_name = azurerm_resource_group.cluster.name
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network_security_group_name = azurerm_network_security_group.worker.name
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priority = 2020 + (each.key == "ipv4" ? 0 : 1)
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access = "Allow"
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direction = "Inbound"
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protocol = "Tcp"
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source_port_range = "*"
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destination_port_range = "9100"
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source_address_prefixes = local.worker_subnets[each.key]
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destination_address_prefixes = local.worker_subnets[each.key]
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}
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# Allow Prometheus to scrape kube-proxy
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resource "azurerm_network_security_rule" "worker-kube-proxy" {
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for_each = local.worker_subnets
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name = "allow-kube-proxy-${each.key}"
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resource_group_name = azurerm_resource_group.cluster.name
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network_security_group_name = azurerm_network_security_group.worker.name
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priority = 2024 + (each.key == "ipv4" ? 0 : 1)
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access = "Allow"
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direction = "Inbound"
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protocol = "Tcp"
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source_port_range = "*"
|
|
destination_port_range = "10249"
|
|
source_address_prefixes = local.worker_subnets[each.key]
|
|
destination_address_prefixes = local.worker_subnets[each.key]
|
|
}
|
|
|
|
# Allow apiserver to access kubelet's for exec, log, port-forward
|
|
resource "azurerm_network_security_rule" "worker-kubelet" {
|
|
for_each = local.worker_subnets
|
|
|
|
name = "allow-kubelet-${each.key}"
|
|
resource_group_name = azurerm_resource_group.cluster.name
|
|
network_security_group_name = azurerm_network_security_group.worker.name
|
|
priority = 2026 + (each.key == "ipv4" ? 0 : 1)
|
|
access = "Allow"
|
|
direction = "Inbound"
|
|
protocol = "Tcp"
|
|
source_port_range = "*"
|
|
destination_port_range = "10250"
|
|
# allow Prometheus to scrape kubelet metrics too
|
|
source_address_prefixes = local.cluster_subnets[each.key]
|
|
destination_address_prefixes = local.worker_subnets[each.key]
|
|
}
|
|
|
|
# Override Azure AllowVNetInBound and AllowAzureLoadBalancerInBound
|
|
# https://docs.microsoft.com/en-us/azure/virtual-network/security-overview#default-security-rules
|
|
|
|
resource "azurerm_network_security_rule" "worker-allow-loadblancer" {
|
|
resource_group_name = azurerm_resource_group.cluster.name
|
|
|
|
name = "allow-loadbalancer"
|
|
network_security_group_name = azurerm_network_security_group.worker.name
|
|
priority = "3000"
|
|
access = "Allow"
|
|
direction = "Inbound"
|
|
protocol = "*"
|
|
source_port_range = "*"
|
|
destination_port_range = "*"
|
|
source_address_prefix = "AzureLoadBalancer"
|
|
destination_address_prefix = "*"
|
|
}
|
|
|
|
resource "azurerm_network_security_rule" "worker-deny-all" {
|
|
resource_group_name = azurerm_resource_group.cluster.name
|
|
|
|
name = "deny-all"
|
|
network_security_group_name = azurerm_network_security_group.worker.name
|
|
priority = "3005"
|
|
access = "Deny"
|
|
direction = "Inbound"
|
|
protocol = "*"
|
|
source_port_range = "*"
|
|
destination_port_range = "*"
|
|
source_address_prefix = "*"
|
|
destination_address_prefix = "*"
|
|
}
|
|
|