====== Lição Terraform GCP 01 ======

FIXME **Fluxo: ** file.tf -> terraform init -> terraform plan -> terraform apply -> terraform destroy

FIXME **Para identar:** terraform fmt

===== Iniciando o provider =====
<code bash>
$ mkdir lession01
$ cd lession01
</code>

<file tf provider.tf>
terraform {
  required_providers {
    google = {
      source = "hashicorp/google"
      version = "4.51.0"
    }
  }
}

provider "google" {
  # Configuration options
}
</file>

<code bash>
$ terraform init

Initializing the backend...

Initializing provider plugins...
- Finding hashicorp/google versions matching "4.51.0"...
- Installing hashicorp/google v4.51.0...
- Installed hashicorp/google v4.51.0 (signed by HashiCorp)

Terraform has created a lock file .terraform.lock.hcl to record the provider
selections it made above. Include this file in your version control repository
so that Terraform can guarantee to make the same selections by default when
you run "terraform init" in the future.

Terraform has been successfully initialized!

You may now begin working with Terraform. Try running "terraform plan" to see
any changes that are required for your infrastructure. All Terraform commands
should now work.

If you ever set or change modules or backend configuration for Terraform,
rerun this command to reinitialize your working directory. If you forget, other
commands will detect it and remind you to do so if necessary.
</code>

===== Iniciando o projeto =====

Requisito: ativar o **Compute Engine API** e criar uma **Service accounts** 

  * Navigation menu -> Compute Engine -> VM instances
  * Navigation menu -> IAM & Admin -> Service accounts

FIXME Baixar a chave depois de criar Service account

<file tf provider.tf>
$ cat provider.tf
terraform {
  required_providers {
    google = {
      source  = "hashicorp/google"
      version = "4.51.0"
    }
  }
}

provider "google" {
  credentials = "/home/gean/gcp/svc-account/singular-carver-376919-f09b67c64df6.json"
  project     = "singular-carver-376919"
  region      = "us-central1"
}
</file>

<code bash>
$ terraform fmt
$ terraform validate
Success! The configuration is valid.
</code>

===== VPC =====

<file tf network.tf>
resource "google_compute_network" "vpc_network" {
  name                    = "vpc-network"
  auto_create_subnetworks = false
}
</file>

<code bash>
$ terraform plan

Terraform used the selected providers to generate the following execution plan. Resource actions are indicated with the following symbols:
  + create

Terraform will perform the following actions:

  # google_compute_network.vpc_network will be created
  + resource "google_compute_network" "vpc_network" {
      + auto_create_subnetworks         = false
      + delete_default_routes_on_create = false
      + gateway_ipv4                    = (known after apply)
      + id                              = (known after apply)
      + internal_ipv6_range             = (known after apply)
      + mtu                             = (known after apply)
      + name                            = "vpc-network"
      + project                         = (known after apply)
      + routing_mode                    = (known after apply)
      + self_link                       = (known after apply)
    }

Plan: 1 to add, 0 to change, 0 to destroy.

───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────

Note: You didn't use the -out option to save this plan, so Terraform can't guarantee to take exactly these actions if you run "terraform apply"
now.
</code>

<code bash>
$ terraform apply

Terraform used the selected providers to generate the following execution plan. Resource actions are indicated with the following symbols:
  + create

Terraform will perform the following actions:

  # google_compute_network.vpc_network will be created
  + resource "google_compute_network" "vpc_network" {
      + auto_create_subnetworks         = false
      + delete_default_routes_on_create = false
      + gateway_ipv4                    = (known after apply)
      + id                              = (known after apply)
      + internal_ipv6_range             = (known after apply)
      + mtu                             = (known after apply)
      + name                            = "vpc-network"
      + project                         = (known after apply)
      + routing_mode                    = (known after apply)
      + self_link                       = (known after apply)
    }

Plan: 1 to add, 0 to change, 0 to destroy.

Do you want to perform these actions?
  Terraform will perform the actions described above.
  Only 'yes' will be accepted to approve.

  Enter a value: yes

google_compute_network.vpc_network: Creating...
google_compute_network.vpc_network: Still creating... [10s elapsed]
google_compute_network.vpc_network: Creation complete after 16s [id=projects/singular-carver-376919/global/networks/vpc-network]

Apply complete! Resources: 1 added, 0 changed, 0 destroyed.
</code>

===== Firewall =====
<file tf firewall.tf>
$ cat firewall.tf
resource "google_compute_firewall" "allow-icmp-ssh" {
  name    = "allow-icmp-ssh"
  network = "vpc-network"

  allow {
    protocol = "icmp"
  }

  allow {
    protocol = "tcp"
    ports    = ["22"]
  }

  source_ranges = ["0.0.0.0/0"]
}
</file>

<code bash>
$ terraform apply -auto-approve
google_compute_network.vpc_network: Refreshing state... [id=projects/singular-carver-376919/global/networks/vpc-network]

Terraform used the selected providers to generate the following execution plan. Resource actions are indicated with the following symbols:
  + create

Terraform will perform the following actions:

  # google_compute_firewall.allow-icmp-ssh will be created
  + resource "google_compute_firewall" "allow-icmp-ssh" {
      + creation_timestamp = (known after apply)
      + destination_ranges = (known after apply)
      + direction          = (known after apply)
      + enable_logging     = (known after apply)
      + id                 = (known after apply)
      + name               = "allow-icmp-ssh"
      + network            = "vpc-network"
      + priority           = 1000
      + project            = (known after apply)
      + self_link          = (known after apply)
      + source_ranges      = [
          + "0.0.0.0/0",
        ]

      + allow {
          + ports    = [
              + "22",
            ]
          + protocol = "tcp"
        }
      + allow {
          + ports    = []
          + protocol = "icmp"
        }
    }

Plan: 1 to add, 0 to change, 0 to destroy.
google_compute_firewall.allow-icmp-ssh: Creating...
google_compute_firewall.allow-icmp-ssh: Still creating... [10s elapsed]
google_compute_firewall.allow-icmp-ssh: Creation complete after 14s [id=projects/singular-carver-376919/global/firewalls/allow-icmp-ssh]

Apply complete! Resources: 1 added, 0 changed, 0 destroyed.
</code>

===== Subnet =====

<file tf subnet.tf>
resource "google_compute_subnetwork" "subnetwork-internal-ipv4" {
  name             = "internal-subnetwork"
  ip_cidr_range    = "10.0.0.0/22"
  region           = "us-central1"
  network          = "vpc-network"
}
</file>

===== Instance =====
<file tf instance.tf>
resource "google_compute_instance" "default" {
  name         = "test"
  machine_type = "e2-medium"
  zone         = "us-central1-a"

  boot_disk {
    initialize_params {
      image = "debian-cloud/debian-11"
    }
  }

  network_interface {
    network = "vpc-network"
    subnetwork = "internal-subnetwork"
  }
}
</file>

===== Disk =====
<file tf disk.tf>
resource "google_compute_disk" "default" {
  name = "test-disk"
  type = "pd-ssd"
  zone = "us-central1-a"
  size = 30
}
</file>

<file tf instance.tf>
resource "google_compute_instance" "default" {
  name         = "test"
  machine_type = "e2-medium"
  zone         = "us-central1-a"

  boot_disk {
    initialize_params {
      image = "debian-cloud/debian-11"
    }
  }

  network_interface {
    network    = "vpc-network"
    subnetwork = "internal-subnetwork"
  }

  attached_disk {
    source = "test-disk"
  }

  allow_stopping_for_update = true
}
</file>
===== Referências =====
  - [[https://registry.terraform.io/providers/hashicorp/google/latest|google]]
  - [[https://registry.terraform.io/providers/hashicorp/google/latest/docs/guides/getting_started|Getting Started with the Google Provider]]
  - [[https://registry.terraform.io/providers/hashicorp/google/latest/docs/resources/compute_network|google_compute_network]]
  - [[https://registry.terraform.io/providers/hashicorp/google/latest/docs/resources/compute_firewall|google_compute_firewall]]
  - [[https://registry.terraform.io/providers/hashicorp/google/latest/docs/resources/compute_subnetwork|google_compute_subnetwork]]
  - [[https://mihaibojin.medium.com/deploy-and-configure-google-compute-engine-vms-with-terraform-f6b708b226c1|Deploy and configure Google Compute Engine VMs with Terraform]]