feat: integrate tailscale access and lock SSH/API to tailnet

.gitea/workflows/deploy.yml

@@ -16,6 +16,8 @@ env:
   TF_VAR_s3_secret_key: ${{ secrets.S3_SECRET_KEY }}
   TF_VAR_s3_endpoint: ${{ secrets.S3_ENDPOINT }}
   TF_VAR_s3_bucket: ${{ secrets.S3_BUCKET }}
+  TF_VAR_tailscale_auth_key: ${{ secrets.TAILSCALE_AUTH_KEY }}
+  TF_VAR_tailscale_tailnet: ${{ secrets.TAILSCALE_TAILNET }}
 
 jobs:
   terraform:
@@ -155,6 +157,12 @@ jobs:
           apt-get update && apt-get install -y python3-pip
           pip3 install --break-system-packages ansible kubernetes jinja2 pyyaml
 
+      - name: Install Tailscale on runner
+        run: curl -fsSL https://tailscale.com/install.sh | sh
+
+      - name: Connect runner to tailnet
+        run: tailscale up --authkey "${{ secrets.TAILSCALE_CI_AUTH_KEY }}" --hostname "gitea-runner-${{ github.run_number }}" --ssh=false --accept-routes=false
+
       - name: Install Ansible Collections
         run: ansible-galaxy collection install -r ansible/requirements.yml
 

.gitea/workflows/destroy.yml

@@ -15,6 +15,8 @@ env:
   TF_VAR_s3_secret_key: ${{ secrets.S3_SECRET_KEY }}
   TF_VAR_s3_endpoint: ${{ secrets.S3_ENDPOINT }}
   TF_VAR_s3_bucket: ${{ secrets.S3_BUCKET }}
+  TF_VAR_tailscale_auth_key: ${{ secrets.TAILSCALE_AUTH_KEY }}
+  TF_VAR_tailscale_tailnet: ${{ secrets.TAILSCALE_TAILNET }}
 
 jobs:
   destroy:

README.md

@@ -11,6 +11,7 @@ Production-ready Kubernetes cluster on Hetzner Cloud using Terraform and Ansible
 | **Total Cost** | €28.93/mo |
 | **K8s** | k3s (latest, HA) |
 | **Addons** | Hetzner CCM (load balancers) |
+| **Access** | SSH/API restricted to Tailnet |
 | **Bootstrap** | Terraform + Ansible |
 
 ### Cluster Resources
@@ -87,7 +88,15 @@ s3_secret_key = "your-backblaze-application-key"
 s3_endpoint   = "https://s3.eu-central-003.backblazeb2.com"
 s3_bucket     = "k8s-terraform-state"
 
-allowed_ssh_ips = ["your.ip.address/32"]
+tailscale_auth_key = "tskey-auth-..."
+tailscale_tailnet  = "yourtailnet.ts.net"
+
+restrict_api_ssh_to_tailnet = true
+tailnet_cidr                = "100.64.0.0/10"
+enable_nodeport_public      = false
+
+allowed_ssh_ips = []
+allowed_api_ips = []
 ```
 
 ### 3. Initialize Terraform
@@ -153,6 +162,9 @@ Set these in your Gitea repository settings (**Settings** → **Secrets** → **
 | `S3_SECRET_KEY` | Backblaze B2 applicationKey |
 | `S3_ENDPOINT` | Backblaze S3 endpoint (e.g., `https://s3.eu-central-003.backblazeb2.com`) |
 | `S3_BUCKET` | S3 bucket name (e.g., `k8s-terraform-state`) |
+| `TAILSCALE_AUTH_KEY` | Tailscale auth key for node bootstrap |
+| `TAILSCALE_TAILNET` | Tailnet domain (e.g., `yourtailnet.ts.net`) |
+| `TAILSCALE_CI_AUTH_KEY` | Tailscale auth key for CI runner |
 | `SSH_PUBLIC_KEY` | SSH public key content |
 | `SSH_PRIVATE_KEY` | SSH private key content |
 
@@ -192,14 +204,15 @@ Set these in your Gitea repository settings (**Settings** → **Secrets** → **
 
 | Port | Source | Purpose |
 |------|--------|---------|
-| 22 | Any | SSH |
-| 6443 | Configured IPs + internal | Kubernetes API |
+| 22 | Tailnet CIDR | SSH |
+| 6443 | Tailnet CIDR + internal | Kubernetes API |
+| 41641/udp | Any | Tailscale WireGuard |
 | 9345 | 10.0.0.0/16 | k3s Supervisor (HA join) |
 | 2379 | 10.0.0.0/16 | etcd Client |
 | 2380 | 10.0.0.0/16 | etcd Peer |
 | 8472 | 10.0.0.0/16 | Flannel VXLAN |
 | 10250 | 10.0.0.0/16 | Kubelet |
-| 30000-32767 | Any | NodePorts |
+| 30000-32767 | Optional | NodePorts (disabled by default) |
 
 ## Operations
 

ansible/generate_inventory.py

@@ -26,29 +26,34 @@ def get_terraform_outputs():
 def main():
     outputs = get_terraform_outputs()
 
+    control_plane_names = outputs["control_plane_names"]["value"]
     control_plane_ips = outputs["control_plane_ips"]["value"]
     control_plane_private_ips = outputs["control_plane_private_ips"]["value"]
+    worker_names = outputs["worker_names"]["value"]
     worker_ips = outputs["worker_ips"]["value"]
     worker_private_ips = outputs["worker_private_ips"]["value"]
+    tailnet = outputs["tailscale_tailnet"]["value"]
 
     control_planes = [
         {
-            "name": f"cp-{i + 1}",
-            "public_ip": public_ip,
+            "name": name,
+            "public_ip": f"{name}.{tailnet}" if tailnet else public_ip,
             "private_ip": private_ip,
         }
-        for i, (public_ip, private_ip) in enumerate(
-            zip(control_plane_ips, control_plane_private_ips)
+        for name, public_ip, private_ip in zip(
+            control_plane_names, control_plane_ips, control_plane_private_ips
         )
     ]
 
     workers = [
         {
-            "name": f"worker-{i + 1}",
-            "public_ip": public_ip,
+            "name": name,
+            "public_ip": f"{name}.{tailnet}" if tailnet else public_ip,
             "private_ip": private_ip,
         }
-        for i, (public_ip, private_ip) in enumerate(zip(worker_ips, worker_private_ips))
+        for name, public_ip, private_ip in zip(
+            worker_names, worker_ips, worker_private_ips
+        )
     ]
 
     data = {

terraform.tfvars.example

@@ -10,6 +10,13 @@ s3_bucket     = "k8s-terraform-state"
 
 cluster_name = "k8s-prod"
 
+tailscale_auth_key = "tskey-auth-..."
+tailscale_tailnet  = "yourtailnet.ts.net"
+
+restrict_api_ssh_to_tailnet = true
+tailnet_cidr                = "100.64.0.0/10"
+enable_nodeport_public      = false
+
 control_plane_count = 3
 control_plane_type  = "cx23"
 
@@ -18,6 +25,6 @@ worker_type  = "cx33"
 
 location = "nbg1"
 
-allowed_ssh_ips = ["0.0.0.0/0"]
+allowed_ssh_ips = []
 
-allowed_api_ips = ["0.0.0.0/0"]
+allowed_api_ips = []

terraform/firewall.tf

@@ -1,3 +1,8 @@
+locals {
+  ssh_source_ips = var.restrict_api_ssh_to_tailnet ? [var.tailnet_cidr] : var.allowed_ssh_ips
+  api_source_ips = var.restrict_api_ssh_to_tailnet ? [var.tailnet_cidr] : var.allowed_api_ips
+}
+
 resource "hcloud_firewall" "cluster" {
   name = "${var.cluster_name}-firewall"
 
@@ -6,7 +11,7 @@ resource "hcloud_firewall" "cluster" {
     direction   = "in"
     protocol    = "tcp"
     port        = "22"
-    source_ips  = var.allowed_ssh_ips
+    source_ips  = local.ssh_source_ips
   }
 
   rule {
@@ -14,7 +19,15 @@ resource "hcloud_firewall" "cluster" {
     direction   = "in"
     protocol    = "tcp"
     port        = "6443"
-    source_ips  = var.allowed_api_ips
+    source_ips  = local.api_source_ips
+  }
+
+  rule {
+    description = "Tailscale WireGuard"
+    direction   = "in"
+    protocol    = "udp"
+    port        = "41641"
+    source_ips  = ["0.0.0.0/0"]
   }
 
   rule {
@@ -65,12 +78,15 @@ resource "hcloud_firewall" "cluster" {
     source_ips  = [var.subnet_cidr]
   }
 
-  rule {
-    description = "NodePorts"
-    direction   = "in"
-    protocol    = "tcp"
-    port        = "30000-32767"
-    source_ips  = ["0.0.0.0/0"]
+  dynamic "rule" {
+    for_each = var.enable_nodeport_public ? [1] : []
+    content {
+      description = "NodePorts"
+      direction   = "in"
+      protocol    = "tcp"
+      port        = "30000-32767"
+      source_ips  = ["0.0.0.0/0"]
+    }
   }
 
   rule {

terraform/outputs.tf

@@ -3,6 +3,11 @@ output "control_plane_ips" {
   value       = [for cp in hcloud_server.control_plane : cp.ipv4_address]
 }
 
+output "control_plane_names" {
+  description = "Control plane hostnames"
+  value       = [for cp in hcloud_server.control_plane : cp.name]
+}
+
 output "control_plane_private_ips" {
   description = "Private IPs of control plane nodes"
   value       = [for cp in hcloud_server.control_plane : one(cp.network).ip]
@@ -18,6 +23,11 @@ output "worker_ips" {
   value       = [for worker in hcloud_server.workers : worker.ipv4_address]
 }
 
+output "worker_names" {
+  description = "Worker hostnames"
+  value       = [for worker in hcloud_server.workers : worker.name]
+}
+
 output "worker_private_ips" {
   description = "Private IPs of worker nodes"
   value       = [for worker in hcloud_server.workers : one(worker.network).ip]
@@ -33,6 +43,11 @@ output "cluster_name" {
   value       = var.cluster_name
 }
 
+output "tailscale_tailnet" {
+  description = "Tailnet domain suffix"
+  value       = var.tailscale_tailnet
+}
+
 output "network_cidr" {
   description = "Private network CIDR"
   value       = var.subnet_cidr

terraform/servers.tf

@@ -17,6 +17,14 @@ resource "hcloud_server" "control_plane" {
     role    = "control-plane"
   }
 
+  user_data = <<-EOF
+    #cloud-config
+    package_update: true
+    runcmd:
+      - curl -fsSL https://tailscale.com/install.sh | sh
+      - tailscale up --authkey '${var.tailscale_auth_key}' --hostname '${var.cluster_name}-cp-${count.index + 1}' --ssh=false --accept-routes=false
+  EOF
+
   network {
     network_id = hcloud_network.cluster.id
     ip         = cidrhost(var.subnet_cidr, 10 + count.index)
@@ -44,6 +52,14 @@ resource "hcloud_server" "workers" {
     role    = "worker"
   }
 
+  user_data = <<-EOF
+    #cloud-config
+    package_update: true
+    runcmd:
+      - curl -fsSL https://tailscale.com/install.sh | sh
+      - tailscale up --authkey '${var.tailscale_auth_key}' --hostname '${var.cluster_name}-worker-${count.index + 1}' --ssh=false --accept-routes=false
+  EOF
+
   network {
     network_id = hcloud_network.cluster.id
     ip         = cidrhost(var.subnet_cidr, 20 + count.index)

terraform/variables.tf

@@ -55,13 +55,42 @@ variable "location" {
 variable "allowed_ssh_ips" {
   description = "IP ranges allowed for SSH access"
   type        = list(string)
-  default     = ["0.0.0.0/0"]
+  default     = []
 }
 
 variable "allowed_api_ips" {
   description = "IP ranges allowed for Kubernetes API access"
   type        = list(string)
-  default     = ["0.0.0.0/0"]
+  default     = []
+}
+
+variable "restrict_api_ssh_to_tailnet" {
+  description = "Restrict SSH and Kubernetes API to tailnet CIDR"
+  type        = bool
+  default     = true
+}
+
+variable "tailnet_cidr" {
+  description = "Tailnet CIDR used for SSH/API access"
+  type        = string
+  default     = "100.64.0.0/10"
+}
+
+variable "tailscale_auth_key" {
+  description = "Tailscale auth key for node bootstrap"
+  type        = string
+  sensitive   = true
+}
+
+variable "tailscale_tailnet" {
+  description = "Tailnet domain suffix, e.g. mytailnet.ts.net"
+  type        = string
+}
+
+variable "enable_nodeport_public" {
+  description = "Allow public NodePort traffic"
+  type        = bool
+  default     = false
 }
 
 variable "network_cidr" {