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Add IPv6 support for Typhoon Azure clusters

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* 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
This commit is contained in:
Dalton Hubble
2024-07-05 17:21:50 -07:00
parent 3483ed8bd5
commit 48d4973957
28 changed files with 899 additions and 560 deletions
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12
docs/fedora-coreos/azure.md
View File

@ -67,15 +67,15 @@ Fedora CoreOS publishes images for Azure, but does not yet upload them. Azure al
[Download](https://getfedora.org/en/coreos/download?tab=cloud_operators&stream=stable) a Fedora CoreOS Azure VHD image, decompress it, and upload it to an Azure storage account container (i.e. bucket) via the UI (quite slow).
```
xz -d fedora-coreos-36.20220716.3.1-azure.x86_64.vhd.xz
xz -d fedora-coreos-40.20240616.3.0-azure.x86_64.vhd.xz
```
Create an Azure disk (note disk ID) and create an Azure image from it (note image ID).
```
az disk create --name fedora-coreos-36.20220716.3.1 -g GROUP --source https://BUCKET.blob.core.windows.net/fedora-coreos/fedora-coreos-36.20220716.3.1-azure.x86_64.vhd
az disk create --name fedora-coreos-40.20240616.3.0 -g GROUP --source https://BUCKET.blob.core.windows.net/images/fedora-coreos-40.20240616.3.0-azure.x86_64.vhd
az image create --name fedora-coreos-36.20220716.3.1 -g GROUP --os-type=linux --source /subscriptions/some/path/providers/Microsoft.Compute/disks/fedora-coreos-36.20220716.3.1
az image create --name fedora-coreos-40.20240616.3.0 -g GROUP --os-type linux --source /subscriptions/some/path/Microsoft.Compute/disks/fedora-coreos-40.20240616.3.0
```
Set the [os_image](#variables) in the next step.
@ -100,7 +100,9 @@ module "ramius" {
# optional
worker_count = 2
host_cidr = "10.0.0.0/20"
network_cidr = {
ipv4 = ["10.0.0.0/20"]
}
}
```
@ -246,7 +248,7 @@ Reference the DNS zone with `azurerm_dns_zone.clusters.name` and its resource gr
| controller_snippets | Controller Butane snippets | [] | [example](/advanced/customization/#usage) |
| worker_snippets | Worker Butane snippets | [] | [example](/advanced/customization/#usage) |
| networking | Choice of networking provider | "cilium" | "calico" or "cilium" or "flannel" |
| host_cidr | CIDR IPv4 range to assign to instances | "10.0.0.0/16" | "10.0.0.0/20" |
| network_cidr | Virtual network CIDR ranges | { ipv4 = ["10.0.0.0/16"], ipv6 = [ULA, ...] } | { ipv4 = ["10.0.0.0/20"] } |
| pod_cidr | CIDR IPv4 range to assign to Kubernetes pods | "10.2.0.0/16" | "10.22.0.0/16" |
| service_cidr | CIDR IPv4 range to assign to Kubernetes services | "10.3.0.0/16" | "10.3.0.0/24" |
| worker_node_labels | List of initial worker node labels | [] | ["worker-pool=default"] |