Setting Up The Home Lab: Terraform and Cloud-Init

# provider.tf - This is where I define my providers

terraform {
  required_providers {
    proxmox = {
      source = "telmate/proxmox"
      #latest version as of 16 July 2024
      version = "3.0.1-rc3"
    }
  }
}

provider "proxmox" {
  # References our vars.tf file to plug in the api_url
  pm_api_url = "https://${var.proxmox_host}:8006/api2/json"
  # Provided in a file, secrets.tfvars containing secret terraform variables
  pm_api_token_id = var.token_id 
  # Also provided in secrets.tfvars
  pm_api_token_secret = var.token_secret
  # Defined in vars.tf
  pm_tls_insecure = var.pm_tls_insecure
  pm_log_enable = true
  # this is useful for logging what Terraform is doing
  pm_log_file   = "terraform-plugin-proxmox.log"
  pm_log_levels = {
    _default    = "debug"
    _capturelog = ""
  }
}

# cloud-init.tf - This is where I store cloud-init configuration

# Source the Cloud Init Config file. NB: This file should be located 
# in the "files" directory under the directory you have your Terraform
# files in.
data "template_file" "cloud_init_test1" { 
  template  = "${file("${path.module}/files/test1.cloud_config")}"

  vars = {
    ssh_key = file("~/.ssh/id_ed25519.pub")
    hostname = var.vm_name
    domain = "scurrilous.foo"
  }
}

# Create a local copy of the file, to transfer to Proxmox.
resource "local_file" "cloud_init_test1" {
  content   = data.template_file.cloud_init_test1.rendered
  filename  = "${path.module}/files/user_data_cloud_init_test1.cfg"
}

# Transfer the file to the Proxmox Host
resource "null_resource" "cloud_init_test1" {
  connection {
    type    = "ssh"
    user    = "root"
    private_key = file("~/.ssh/id_ed25519")
    host    = var.proxmox_host
  }

  provisioner "file" {
    source       = local_file.cloud_init_test1.filename
    destination  = "/var/lib/vz/snippets/cloud_init_test1.yml"
  }
}

# main.tf - This is where I define the VMs I want to deploy with Terraform

resource "proxmox_vm_qemu" "cloudinit-test" {
    name = var.vm_name
    desc = "Testing Terraform and cloud-init"
    depends_on = [ null_resource.cloud_init_test1 ]
    # Node name has to be the same name as within the cluster
    # this might not include the FQDN
    target_node = var.proxmox_host

    # The template name to clone this vm from
    clone = var.template_name
    # Activate QEMU agent for this VM
    agent = 1

    os_type = "cloud-init"
    cores = 2
    sockets = 1
    vcpus = 0
    cpu = "host"
    memory = 2048
    scsihw = "virtio-scsi-single"

    # Setup the disk
    disks {
        ide {
            ide2 {
                cloudinit {
                    storage = "containers-and-vms"
                }
            }
        }
        scsi {
            scsi0 {
                disk {
                  size     = "32G"
                  storage  = "containers-and-vms"
                  discard  = true
                  iothread = true
                }
            }
        }
    }

    network {
        model = "virtio"
        bridge = var.nic_name
    tag = -1
    }

    # Setup the ip address using cloud-init.
    boot = "order=scsi0"
    # Keep in mind to use the CIDR notation for the ip.
    ipconfig0 = "ip=192.168.1.80/24,gw=192.168.1.1,ip6=dhcp"
    skip_ipv6 = true

    lifecycle {
      ignore_changes = [
        ciuser,
        sshkeys,
        network
      ]
    }
    cicustom = "user=local:snippets/cloud_init_test1.yml"
}

#cloud-config

ssh_authorized_keys:
  - <ssh public key 1>
  - <ssh public key 2>

runcmd:
  - apt-get update
  - apt-get install -y nginx

write_files:
  - content: |
      #!/bin/bash
      echo "ZOMBIES RULE BELGIUM?"
    path: /usr/local/bin/my-script
    permissions: '0755'

scripts-user:
  - /usr/local/bin/my-script