terraform-hcloud-kube-hetzner/main.tf

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variable "hcloud_token" {
description = "Hetzner API tokey"
type = string
}
variable "public_key" {
description = "SSH public Key."
type = string
}
variable "private_key" {
description = "SSH private Key."
type = string
}
variable "location" {
description = "Default server location"
type = string
}
variable "control_plane_server_type" {
description = "Default control plane server type"
type = string
}
variable "agent_server_type" {
description = "Default agent server type"
type = string
}
variable "lb_server_type" {
description = "Default load balancer server type"
type = string
}
variable "servers_num" {
description = "Number of control plane nodes."
type = number
}
variable "agents_num" {
description = "Number of agent nodes."
type = number
}
provider "hcloud" {
token = var.hcloud_token
}
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resource "random_password" "k3s_token" {
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length = 48
special = false
}
resource "hcloud_ssh_key" "default" {
name = "K3S terraform module - Provisioning SSH key"
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public_key = local.ssh_public_key
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}
resource "hcloud_network" "k3s" {
name = "k3s-net"
ip_range = "10.0.0.0/8"
}
resource "hcloud_network_subnet" "k3s" {
network_id = hcloud_network.k3s.id
type = "cloud"
network_zone = "eu-central"
ip_range = "10.0.0.0/16"
}
resource "hcloud_firewall" "k3s" {
name = "k3s-firewall"
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# Allowing internal cluster traffic and Hetzner metadata service and cloud API IPs
rule {
direction = "in"
protocol = "tcp"
port = "any"
source_ips = [
"127.0.0.1/32",
"10.0.0.0/8",
"169.254.169.254/32",
"213.239.246.1/32"
]
}
rule {
direction = "in"
protocol = "udp"
port = "any"
source_ips = [
"127.0.0.1/32",
"10.0.0.0/8",
"169.254.169.254/32",
"213.239.246.1/32"
]
}
rule {
direction = "in"
protocol = "icmp"
source_ips = [
"127.0.0.1/32",
"10.0.0.0/8",
"169.254.169.254/32",
"213.239.246.1/32"
]
}
# Allow all traffic to the kube api server
rule {
direction = "in"
protocol = "tcp"
port = "6443"
source_ips = [
"0.0.0.0/0"
]
}
# Allow all traffic to the ssh port
rule {
direction = "in"
protocol = "tcp"
port = "22"
source_ips = [
"0.0.0.0/0"
]
}
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# Allow ping on ipv4
rule {
direction = "in"
protocol = "icmp"
source_ips = [
"0.0.0.0/0"
]
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}
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# Allow basic out traffic
# ICMP to ping outside services
rule {
direction = "out"
protocol = "icmp"
destination_ips = [
"0.0.0.0/0"
]
}
# DNS
rule {
direction = "out"
protocol = "tcp"
port = "53"
destination_ips = [
"0.0.0.0/0"
]
}
rule {
direction = "out"
protocol = "udp"
port = "53"
destination_ips = [
"0.0.0.0/0"
]
}
# HTTP(s)
rule {
direction = "out"
protocol = "tcp"
port = "80"
destination_ips = [
"0.0.0.0/0"
]
}
rule {
direction = "out"
protocol = "tcp"
port = "443"
destination_ips = [
"0.0.0.0/0"
]
}
#NTP
rule {
direction = "out"
protocol = "udp"
port = "123"
destination_ips = [
"0.0.0.0/0"
]
}
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}
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locals {
first_control_plane_network_ip = cidrhost(hcloud_network.k3s.ip_range, 2)
ssh_public_key = trimspace(file(var.public_key))
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hcloud_image_name = "ubuntu-20.04"
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k3os_install_commands = [
"apt install -y grub-efi grub-pc-bin mtools xorriso",
"latest=$(curl -s https://api.github.com/repos/rancher/k3os/releases | jq '.[0].tag_name')",
"curl -Lo ./install.sh https://raw.githubusercontent.com/rancher/k3os/$(echo $latest | xargs)/install.sh",
"chmod +x ./install.sh",
"./install.sh --config /tmp/config.yaml /dev/sda https://github.com/rancher/k3os/releases/download/$(echo $latest | xargs)/k3os-amd64.iso",
"shutdown -r +1",
"sleep 3",
"exit 0"
]
}
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data "hcloud_image" "linux" {
name = local.hcloud_image_name
}
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resource "local_file" "traefik_config" {
content = templatefile("${path.module}/templates/traefik_config.yaml.tpl", {
lb_server_type = var.lb_server_type
location = var.location
})
filename = "${path.module}/templates/rendered/traefik_config.yaml"
}