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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
60 lines
1.2 KiB
HCL
60 lines
1.2 KiB
HCL
locals {
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# format assets for distribution
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assets_bundle = [
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# header with the unpack location
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for key, value in module.bootstrap.assets_dist :
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format("##### %s\n%s", key, value)
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]
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}
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# Secure copy assets to controllers.
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resource "null_resource" "copy-controller-secrets" {
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count = var.controller_count
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depends_on = [
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module.bootstrap,
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azurerm_linux_virtual_machine.controllers
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]
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connection {
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type = "ssh"
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host = azurerm_public_ip.controllers-ipv4[count.index].ip_address
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user = "core"
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timeout = "15m"
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}
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provisioner "file" {
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content = join("\n", local.assets_bundle)
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destination = "/home/core/assets"
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}
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provisioner "remote-exec" {
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inline = [
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"sudo /opt/bootstrap/layout",
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]
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}
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}
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# Connect to a controller to perform one-time cluster bootstrap.
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resource "null_resource" "bootstrap" {
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depends_on = [
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null_resource.copy-controller-secrets,
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module.workers,
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azurerm_dns_a_record.apiserver,
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]
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connection {
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type = "ssh"
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host = azurerm_public_ip.controllers-ipv4[0].ip_address
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user = "core"
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timeout = "15m"
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}
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provisioner "remote-exec" {
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inline = [
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"sudo systemctl start bootstrap",
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]
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}
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}
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