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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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26
docs/advanced/worker-pools.md
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@ -114,11 +114,11 @@ Create a cluster following the Azure [tutorial](../flatcar-linux/azure.md#cluste
source = "git::https://github.com/poseidon/typhoon//azure/fedora-coreos/kubernetes/workers?ref=v1.30.2"
# Azure
region = module.ramius.region
resource_group_name = module.ramius.resource_group_name
subnet_id = module.ramius.subnet_id
security_group_id = module.ramius.security_group_id
backend_address_pool_id = module.ramius.backend_address_pool_id
region = module.ramius.region
resource_group_name = module.ramius.resource_group_name
subnet_id = module.ramius.subnet_id
security_group_id = module.ramius.security_group_id
backend_address_pool_ids = module.ramius.backend_address_pool_ids
# configuration
name = "ramius-spot"
@ -127,7 +127,7 @@ Create a cluster following the Azure [tutorial](../flatcar-linux/azure.md#cluste
# optional
worker_count = 2
vm_type = "Standard_F4"
vm_type = "Standard_D2as_v5"
priority = "Spot"
os_image = "/subscriptions/some/path/Microsoft.Compute/images/fedora-coreos-31.20200323.3.2"
}
@ -140,11 +140,11 @@ Create a cluster following the Azure [tutorial](../flatcar-linux/azure.md#cluste
source = "git::https://github.com/poseidon/typhoon//azure/flatcar-linux/kubernetes/workers?ref=v1.30.2"
# Azure
region = module.ramius.region
resource_group_name = module.ramius.resource_group_name
subnet_id = module.ramius.subnet_id
security_group_id = module.ramius.security_group_id
backend_address_pool_id = module.ramius.backend_address_pool_id
region = module.ramius.region
resource_group_name = module.ramius.resource_group_name
subnet_id = module.ramius.subnet_id
security_group_id = module.ramius.security_group_id
backend_address_pool_ids = module.ramius.backend_address_pool_ids
# configuration
name = "ramius-spot"
@ -153,7 +153,7 @@ Create a cluster following the Azure [tutorial](../flatcar-linux/azure.md#cluste
# optional
worker_count = 2
vm_type = "Standard_F4"
vm_type = "Standard_D2as_v5"
priority = "Spot"
os_image = "flatcar-beta"
}
@ -180,7 +180,7 @@ The Azure internal `workers` module supports a number of [variables](https://git
| resource_group_name | Must be set to `resource_group_name` output by cluster | module.cluster.resource_group_name |
| subnet_id | Must be set to `subnet_id` output by cluster | module.cluster.subnet_id |
| security_group_id | Must be set to `security_group_id` output by cluster | module.cluster.security_group_id |
| backend_address_pool_id | Must be set to `backend_address_pool_id` output by cluster | module.cluster.backend_address_pool_id |
| backend_address_pool_ids | Must be set to `backend_address_pool_ids` output by cluster | module.cluster.backend_address_pool_ids |
| kubeconfig | Must be set to `kubeconfig` output by cluster | module.cluster.kubeconfig |
| ssh_authorized_key | SSH public key for user 'core' | "ssh-ed25519 AAAAB3NZ..." |