7 files changed, 165 insertions, 0 deletions
diff --git a/digitalocean/server/alerts.tf b/digitalocean/server/alerts.tf
new file mode 100644
index 0000000..e8a2c19
--- /dev/null
+++ b/digitalocean/server/alerts.tf
@@ -0,0 +1,28 @@
+data "digitalocean_account" "this" {
+}
+
+resource "digitalocean_monitor_alert" "cpu" {
+  alerts {
+    email = [data.digitalocean_account.this.email]
+  }
+  description = "CPU utilization on ${digitalocean_droplet.this.name}"
+  window      = "5m"
+  type        = "v1/insights/droplet/cpu"
+  compare     = "GreaterThan"
+  value       = 70
+  enabled     = true
+  entities    = [digitalocean_droplet.this.id]
+}
+
+resource "digitalocean_monitor_alert" "load1" {
+  alerts {
+    email = [data.digitalocean_account.this.email]
+  }
+  description = "1-min load avg on ${digitalocean_droplet.this.name}"
+  window      = "5m"
+  type        = "v1/insights/droplet/load_1"
+  compare     = "GreaterThan"
+  value       = 5
+  enabled     = true
+  entities    = [digitalocean_droplet.this.id]
+}
diff --git a/digitalocean/server/etc/cloud-init.cfg b/digitalocean/server/etc/cloud-init.cfg
new file mode 100644
index 0000000..8ed371c
--- /dev/null
+++ b/digitalocean/server/etc/cloud-init.cfg
@@ -0,0 +1,13 @@
+#cloud-config
+
+users:
+  - name: ${jsonencode(user)}
+    lock_passwd: false
+    hashed_passwd: '*'
+    sudo: ALL=(ALL) NOPASSWD:ALL
+    ssh_authorized_keys: ${jsonencode(ssh_keys)}
+    shell: /bin/bash
+
+write_files:
+  - path: /etc/ssh/sshd_config
+    content: ${jsonencode(sshd_config)}
diff --git a/digitalocean/server/etc/sshd_config b/digitalocean/server/etc/sshd_config
new file mode 100644
index 0000000..ae08408
--- /dev/null
+++ b/digitalocean/server/etc/sshd_config
@@ -0,0 +1,39 @@
+Protocol 2
+Port ${port}
+
+# Drop idle sessions:
+ClientAliveCountMax 3
+ClientAliveInterval 15
+
+# Allow reverse tunnels:
+GatewayPorts yes
+
+# Miscellaneous:
+PrintMotd no
+
+# Hardening.
+# Source: https://infosec.mozilla.org/guidelines/openssh.html
+
+# Only Ed25519:
+HostKey /etc/ssh/ssh_host_ed25519_key
+
+# Only the first choices for ciphers:
+KexAlgorithms curve25519-sha256@libssh.org
+Ciphers chacha20-poly1305@openssh.com
+MACs hmac-sha2-512-etm@openssh.com,hmac-sha2-256-etm@openssh.com
+
+# No password login:
+PasswordAuthentication no
+AuthenticationMethods publickey
+# Whitelist users:
+PermitRootLogin no
+AllowGroups ${join(" ", users)}
+
+# Log things:
+Subsystem sftp /usr/lib/openssh/sftp-server -f AUTHPRIV -l INFO
+
+# Whitelist accepted environment variables:
+AcceptEnv LANG LC_*
+
+# Why the fuck would I need X11 forwarding?
+X11Forwarding no
diff --git a/digitalocean/server/main.tf b/digitalocean/server/main.tf
new file mode 100644
index 0000000..78298f4
--- /dev/null
+++ b/digitalocean/server/main.tf
@@ -0,0 +1,34 @@
+locals {
+  sshd_config = templatefile("${path.module}/etc/sshd_config", {
+    port  = var.ssh_port
+    users = [var.user]
+  })
+}
+
+resource "digitalocean_droplet" "this" {
+  image      = var.image
+  name       = var.name
+  region     = var.region
+  size       = var.size
+  monitoring = true
+  ipv6       = false
+  vpc_uuid   = var.vpc_id
+  user_data = templatefile("${path.module}/etc/cloud-init.cfg", {
+    user        = var.user
+    ssh_keys    = var.ssh_keys
+    sshd_config = local.sshd_config
+  })
+  volume_ids        = var.volume_ids
+  droplet_agent     = false
+  graceful_shutdown = true
+}
+
+resource "digitalocean_project_resources" "this" {
+  project   = var.project_id
+  resources = [digitalocean_droplet.this.urn]
+}
+
+resource "digitalocean_floating_ip_assignment" "this" {
+  ip_address = var.ip_address
+  droplet_id = digitalocean_droplet.this.id
+}
diff --git a/digitalocean/server/outputs.tf b/digitalocean/server/outputs.tf
new file mode 100644
index 0000000..3d6a541
--- /dev/null
+++ b/digitalocean/server/outputs.tf
@@ -0,0 +1,3 @@
+output "droplet_id" {
+  value = digitalocean_droplet.this.id
+}
diff --git a/digitalocean/server/providers.tf b/digitalocean/server/providers.tf
new file mode 100644
index 0000000..68aba8c
--- /dev/null
+++ b/digitalocean/server/providers.tf
@@ -0,0 +1,8 @@
+terraform {
+  required_providers {
+    digitalocean = {
+      source  = "digitalocean/digitalocean"
+      version = "~> 2.0"
+    }
+  }
+}
diff --git a/digitalocean/server/variables.tf b/digitalocean/server/variables.tf
new file mode 100644
index 0000000..a3620fc
--- /dev/null
+++ b/digitalocean/server/variables.tf
@@ -0,0 +1,40 @@
+variable "region" {
+  type = string
+}
+variable "project_id" {
+  type = string
+}
+
+variable "name" {
+  type = string
+}
+variable "vpc_id" {
+  type = string
+}
+variable "ip_address" {
+  type = string
+}
+variable "volume_ids" {
+  type    = list(string)
+  default = []
+}
+
+variable "user" {
+  type = string
+}
+variable "ssh_keys" {
+  type = list(string)
+}
+variable "ssh_port" {
+  type    = string
+  default = "22"
+}
+
+variable "image" {
+  type    = string
+  default = "debian-12-x64"
+}
+variable "size" {
+  type    = string
+  default = "s-1vcpu-2gb"
+}