server/infra/modules/prod/main.tf

# prod: Traefik, Websites, Bitwarden, RustDesk, status page

# Port sources: services/prod/*docker-compose.yml (published ports) and services/todo.md
# (the documented UFW allow-list).
resource "hcloud_firewall" "this" {
  name = "prod-firewall"

  rule { # server ssh - wired to the vpn server's public IP only, see infra/main.tf
    direction  = "in"
    protocol   = "tcp"
    port       = "22"
    source_ips = var.allowed_ssh_source_ips
  }

  rule { # Traefik http/https (Websites, Bitwarden, status page)
    direction  = "in"
    protocol   = "tcp"
    port       = "80"
    source_ips = ["0.0.0.0/0", "::/0"]
  }

  rule {
    direction  = "in"
    protocol   = "tcp"
    port       = "443"
    source_ips = ["0.0.0.0/0", "::/0"]
  }

  rule { # rustdesk hbbs
    direction  = "in"
    protocol   = "tcp"
    port       = "21115"
    source_ips = ["0.0.0.0/0", "::/0"]
  }

  rule {
    direction  = "in"
    protocol   = "tcp"
    port       = "21116"
    source_ips = ["0.0.0.0/0", "::/0"]
  }

  rule {
    direction  = "in"
    protocol   = "udp"
    port       = "21116"
    source_ips = ["0.0.0.0/0", "::/0"]
  }

  rule { # rustdesk hbbr
    direction  = "in"
    protocol   = "tcp"
    port       = "21117"
    source_ips = ["0.0.0.0/0", "::/0"]
  }

  rule {
    direction  = "in"
    protocol   = "tcp"
    port       = "21119"
    source_ips = ["0.0.0.0/0", "::/0"]
  }

  rule { # traffic from dev over the private network
    direction  = "in"
    protocol   = "tcp"
    port       = "1-65535"
    source_ips = [var.network_ip_range]
  }

  rule {
    direction  = "in"
    protocol   = "udp"
    port       = "1-65535"
    source_ips = [var.network_ip_range]
  }
}

resource "hcloud_server" "this" {
  name         = "prod"
  server_type  = var.server_type
  image        = var.image
  location     = var.location
  ssh_keys     = var.ssh_key_ids
  firewall_ids = [hcloud_firewall.this.id]

  network {
    network_id = var.network_id
    ip         = var.private_ip
  }

  connection {
    type        = "ssh"
    host        = self.ipv4_address
    user        = "root"
    private_key = file(var.ssh_private_key_path)
  }

  provisioner "file" {
    content     = var.bootstrap_script
    destination = "/root/bootstrap.sh"
  }

  provisioner "remote-exec" {
    inline = [
      "chmod +x /root/bootstrap.sh",
      "/root/bootstrap.sh",
    ]
  }
}

resource "hcloud_volume" "storage" {
  name      = "prod-storage"
  size      = var.volume_size
  server_id = hcloud_server.this.id
  automount = true
  format    = "ext4"

  lifecycle {
    prevent_destroy = true
  }
}

locals {
  # Hetzner's automount convention (hc-utils' 99-hc-volume-automount.rules) is
  # always /mnt/HC_Volume_<id> - deterministic once the volume exists, since the
  # id is stable for the volume's lifetime regardless of which server it's
  # attached to.
  data_dir = "/mnt/HC_Volume_${hcloud_volume.storage.id}"
}

# DATA_DIR is picked up automatically by `docker compose` (which auto-loads
# .env from its working directory) for every prod/*-docker-compose.yml bind
# mount - see services/prod/*.yml. Not committed (see .gitignore): it's tied to
# the live volume's ID, so it's regenerated by tofu apply, not handed off via git.
resource "local_file" "env" {
  filename        = "${path.root}/../services/prod/.env"
  content         = "DATA_DIR=${local.data_dir}\n"
  file_permission = "0644"
}

locals {
  # Everything under services/prod except .env: that's tracked via its own
  # resource content (reading it back with fileset()/filesha1() before it
  # exists would fail during `tofu plan`).
  prod_static_files = sort([
    for f in fileset("${path.root}/../services/prod", "**") : f if f != ".env"
  ])

  prod_static_files_hash = sha1(join("", [
    for f in local.prod_static_files : filesha1("${path.root}/../services/prod/${f}")
  ]))
}

# Copies services/prod to the server on every apply that changes it (a
# hand-edited compose file, ...) or recreates the server - not just once at
# first creation. Split from hcloud_server.this because it must run after
# local_file.env, which in turn depends on the volume, which depends on the
# server - so it can't be a provisioner on the server resource itself.
resource "null_resource" "deploy_services" {
  triggers = {
    server_id    = hcloud_server.this.id
    static_files = local.prod_static_files_hash
    env          = local_file.env.content
  }

  connection {
    type        = "ssh"
    host        = hcloud_server.this.ipv4_address
    user        = "root"
    private_key = file(var.ssh_private_key_path)
  }

  provisioner "remote-exec" {
    inline = ["mkdir -p /home/${var.deploy_user}/services"]
  }

  provisioner "file" {
    source      = "${path.root}/../services/prod"
    destination = "/home/${var.deploy_user}/services"
  }

  provisioner "remote-exec" {
    inline = [
      "chown -R ${var.deploy_user}:${var.deploy_user} /home/${var.deploy_user}/services",
      "chmod +x /home/${var.deploy_user}/services/prod/*.sh",
    ]
  }

  depends_on = [
    hcloud_server.this,
    local_file.env,
  ]
}