HOWTO
See also
GitHub
Initialize Terraform
dave@dave:/git/devops-terraform/gcp$ terraform init
Initializing the backend...
Initializing modules...
- mynet-eu-vm in instance
- mynet-us-vm in instance
Initializing provider plugins...
- Finding latest version of hashicorp/google...
- Installing hashicorp/google v6.6.0...
- Installed hashicorp/google v6.6.0 (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.
Provider
provider "google" {}
Variables
variable "instance_name" {}
variable "instance_zone" {}
variable "instance_type" {
default = "e2-micro"
}
variable "instance_network" {}
Network
$ cat mynetwork.tf
# Create the mynetwork network
resource "google_compute_network" "mynetwork" {
name = "mynetwork"
# RESOURCE properties go here
auto_create_subnetworks = "true"
}
# Add a firewall rule to allow HTTP, SSH, RDP and ICMP traffic on mynetwork
resource "google_compute_firewall" "mynetwork-allow-http-ssh-rdp-icmp" {
name = "mynetwork-allow-http-ssh-rdp-icmp"
# RESOURCE properties go here
network = google_compute_network.mynetwork.self_link
allow {
protocol = "tcp"
ports = ["22", "80", "3389"]
}
allow {
protocol = "icmp"
}
source_ranges = ["0.0.0.0/0"]
}
# Create the mynet-us-vm instance
module "mynet-us-vm" {
source = "./instance"
instance_name = "mynet-us-vm"
instance_zone = "us-central1-a"
instance_network = google_compute_network.mynetwork.self_link
}
# Create the mynet-eu-vm" instance
module "mynet-eu-vm" {
source = "./instance"
instance_name = "mynet-eu-vm"
instance_zone = "europe-west1-d"
instance_network = google_compute_network.mynetwork.self_link
}
Instance
resource "google_compute_instance" "vm_instance" {
name = "${var.instance_name}"
# RESOURCE properties go here
zone = "${var.instance_zone}"
machine_type = "${var.instance_type}"
boot_disk {
initialize_params {
image = "debian-cloud/debian-11"
}
}
network_interface {
network = "${var.instance_network}"
access_config {
# Allocate a one-to-one NAT IP to the instance
}
}
}
Project structure
dave@dave:/git/devops-terraform/gcp$ find
.
./provider.tf
./.terraform
./.terraform/modules
./.terraform/modules/modules.json
./.terraform/providers
./.terraform/providers/registry.terraform.io
./.terraform/providers/registry.terraform.io/hashicorp
./.terraform/providers/registry.terraform.io/hashicorp/google
./.terraform/providers/registry.terraform.io/hashicorp/google/6.6.0
./.terraform/providers/registry.terraform.io/hashicorp/google/6.6.0/linux_amd64
./.terraform/providers/registry.terraform.io/hashicorp/google/6.6.0/linux_amd64/LICENSE.txt
./.terraform/providers/registry.terraform.io/hashicorp/google/6.6.0/linux_amd64/terraform-provider-google_v6.6.0_x5
./instance
./instance/main.tf
./instance/variables.tf
./.terraform.lock.hcl
./mynetwork.tf
1st attempt terraform plan
p$ terraform plan
Planning failed. Terraform encountered an error while generating this plan.
╷
│ Error: Attempted to load application default credentials since neither `credentials` nor `access_token` was set in the provider block. No credentials loaded. To use your gcloud credentials, run 'gcloud auth application-default login'
│
│ with provider["registry.terraform.io/hashicorp/google"],
│ on provider.tf line 1, in provider "google":
│ 1: provider "google" {}
│
│ google: could not find default credentials. See https://cloud.google.com/docs/authentication/external/set-up-adc for more information
Add GCP credentials
$ gcloud auth application-default login
Your browser has been opened to visit:
https://accounts.google.com/o/oauth2/auth?....
Credentials saved to file: [/home/dave/.config/gcloud/application_default_credentials.json]
These credentials will be used by any library that requests Application Default Credentials (ADC).
Quota project "dave-terraform" was added to ADC which can be used by Google client libraries for billing and quota. Note that some services may still bill the project owning the resource.
2nd attempt to run terraform plan
$ terraform plan
Planning failed. Terraform encountered an error while generating this plan.
╷
│ Error: Failed to retrieve project, pid: , err: project: required field is not set
│
│ with google_compute_network.mynetwork,
│ on mynetwork.tf line 2, in resource "google_compute_network" "mynetwork":
│ 2: resource "google_compute_network" "mynetwork" {
Add project id into provider.tf
provider "google" {
project = "dave-terraform"
}
3rd attempt terraform plan
$ 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_firewall.mynetwork-allow-http-ssh-rdp-icmp will be created
+ resource "google_compute_firewall" "mynetwork-allow-http-ssh-rdp-icmp" {
+ creation_timestamp = (known after apply)
+ destination_ranges = (known after apply)
+ direction = (known after apply)
+ enable_logging = (known after apply)
+ id = (known after apply)
+ name = "mynetwork-allow-http-ssh-rdp-icmp"
+ network = (known after apply)
+ priority = 1000
+ project = "dave-terraform"
+ self_link = (known after apply)
+ source_ranges = [
+ "0.0.0.0/0",
]
+ allow {
+ ports = [
+ "22",
+ "80",
+ "3389",
]
+ protocol = "tcp"
}
+ allow {
+ ports = []
+ protocol = "icmp"
}
}
# google_compute_network.mynetwork will be created
+ resource "google_compute_network" "mynetwork" {
+ auto_create_subnetworks = true
+ 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 = "mynetwork"
+ network_firewall_policy_enforcement_order = "AFTER_CLASSIC_FIREWALL"
+ numeric_id = (known after apply)
+ project = "dave-terraform"
+ routing_mode = (known after apply)
+ self_link = (known after apply)
}
# module.mynet-eu-vm.google_compute_instance.vm_instance will be created
+ resource "google_compute_instance" "vm_instance" {
+ can_ip_forward = false
+ cpu_platform = (known after apply)
+ current_status = (known after apply)
+ deletion_protection = false
+ effective_labels = {
+ "goog-terraform-provisioned" = "true"
}
+ id = (known after apply)
+ instance_id = (known after apply)
+ label_fingerprint = (known after apply)
+ machine_type = "e2-micro"
+ metadata_fingerprint = (known after apply)
+ min_cpu_platform = (known after apply)
+ name = "mynet-eu-vm"
+ project = "dave-terraform"
+ self_link = (known after apply)
+ tags_fingerprint = (known after apply)
+ terraform_labels = {
+ "goog-terraform-provisioned" = "true"
}
+ zone = "europe-west1-d"
+ boot_disk {
+ auto_delete = true
+ device_name = (known after apply)
+ disk_encryption_key_sha256 = (known after apply)
+ kms_key_self_link = (known after apply)
+ mode = "READ_WRITE"
+ source = (known after apply)
+ initialize_params {
+ image = "debian-cloud/debian-11"
+ labels = (known after apply)
+ provisioned_iops = (known after apply)
+ provisioned_throughput = (known after apply)
+ resource_policies = (known after apply)
+ size = (known after apply)
+ type = (known after apply)
}
}
+ confidential_instance_config (known after apply)
+ guest_accelerator (known after apply)
+ network_interface {
+ internal_ipv6_prefix_length = (known after apply)
+ ipv6_access_type = (known after apply)
+ ipv6_address = (known after apply)
+ name = (known after apply)
+ network = (known after apply)
+ network_ip = (known after apply)
+ stack_type = (known after apply)
+ subnetwork = (known after apply)
+ subnetwork_project = (known after apply)
+ access_config {
+ nat_ip = (known after apply)
+ network_tier = (known after apply)
}
}
+ reservation_affinity (known after apply)
+ scheduling (known after apply)
}
# module.mynet-us-vm.google_compute_instance.vm_instance will be created
+ resource "google_compute_instance" "vm_instance" {
+ can_ip_forward = false
+ cpu_platform = (known after apply)
+ current_status = (known after apply)
+ deletion_protection = false
+ effective_labels = {
+ "goog-terraform-provisioned" = "true"
}
+ id = (known after apply)
+ instance_id = (known after apply)
+ label_fingerprint = (known after apply)
+ machine_type = "e2-micro"
+ metadata_fingerprint = (known after apply)
+ min_cpu_platform = (known after apply)
+ name = "mynet-us-vm"
+ project = "dave-terraform"
+ self_link = (known after apply)
+ tags_fingerprint = (known after apply)
+ terraform_labels = {
+ "goog-terraform-provisioned" = "true"
}
+ zone = "us-central1-a"
+ boot_disk {
+ auto_delete = true
+ device_name = (known after apply)
+ disk_encryption_key_sha256 = (known after apply)
+ kms_key_self_link = (known after apply)
+ mode = "READ_WRITE"
+ source = (known after apply)
+ initialize_params {
+ image = "debian-cloud/debian-11"
+ labels = (known after apply)
+ provisioned_iops = (known after apply)
+ provisioned_throughput = (known after apply)
+ resource_policies = (known after apply)
+ size = (known after apply)
+ type = (known after apply)
}
}
+ confidential_instance_config (known after apply)
+ guest_accelerator (known after apply)
+ network_interface {
+ internal_ipv6_prefix_length = (known after apply)
+ ipv6_access_type = (known after apply)
+ ipv6_address = (known after apply)
+ name = (known after apply)
+ network = (known after apply)
+ network_ip = (known after apply)
+ stack_type = (known after apply)
+ subnetwork = (known after apply)
+ subnetwork_project = (known after apply)
+ access_config {
+ nat_ip = (known after apply)
+ network_tier = (known after apply)
}
}
+ reservation_affinity (known after apply)
+ scheduling (known after apply)
}
Plan: 4 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.
Terraform apply
$ terraform apply
Plan: 4 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.mynetwork: Creating...
google_compute_network.mynetwork: Still creating... [10s elapsed]
google_compute_network.mynetwork: Still creating... [20s elapsed]
google_compute_network.mynetwork: Still creating... [30s elapsed]
google_compute_network.mynetwork: Still creating... [40s elapsed]
google_compute_network.mynetwork: Still creating... [50s elapsed]
google_compute_network.mynetwork: Creation complete after 53s [id=projects/dave-terraform/global/networks/mynetwork]
google_compute_firewall.mynetwork-allow-http-ssh-rdp-icmp: Creating...
module.mynet-eu-vm.google_compute_instance.vm_instance: Creating...
module.mynet-us-vm.google_compute_instance.vm_instance: Creating...
google_compute_firewall.mynetwork-allow-http-ssh-rdp-icmp: Still creating... [10s elapsed]
module.mynet-eu-vm.google_compute_instance.vm_instance: Still creating... [10s elapsed]
module.mynet-us-vm.google_compute_instance.vm_instance: Still creating... [10s elapsed]
google_compute_firewall.mynetwork-allow-http-ssh-rdp-icmp: Creation complete after 12s [id=projects/dave-terraform/global/firewalls/mynetwork-allow-http-ssh-rdp-icmp]
module.mynet-us-vm.google_compute_instance.vm_instance: Creation complete after 18s [id=projects/dave-terraform/zones/us-central1-a/instances/mynet-us-vm]
module.mynet-eu-vm.google_compute_instance.vm_instance: Still creating... [20s elapsed]
module.mynet-eu-vm.google_compute_instance.vm_instance: Creation complete after 26s [id=projects/dave-terraform/zones/europe-west1-d/instances/mynet-eu-vm]
Check created resources
VPC network
Firewall
VMs
Destroy created resources
$ terraform destroy
Terraform will perform the following actions:
# google_compute_firewall.mynetwork-allow-http-ssh-rdp-icmp will be destroyed
- resource "google_compute_firewall" "mynetwork-allow-http-ssh-rdp-icmp" {
- creation_timestamp = "2024-10-10T09:46:54.415-07:00" -> null
- destination_ranges = [] -> null
- direction = "INGRESS" -> null
- disabled = false -> null
- id = "projects/dave-terraform/global/firewalls/mynetwork-allow-http-ssh-rdp-icmp" -> null
- name = "mynetwork-allow-http-ssh-rdp-icmp" -> null
- network = "https://www.googleapis.com/compute/v1/projects/dave-terraform/global/networks/mynetwork" -> null
- priority = 1000 -> null
- project = "dave-terraform" -> null
- self_link = "https://www.googleapis.com/compute/v1/projects/dave-terraform/global/firewalls/mynetwork-allow-http-ssh-rdp-icmp" -> null
- source_ranges = [
- "0.0.0.0/0",
] -> null
- source_service_accounts = [] -> null
- source_tags = [] -> null
- target_service_accounts = [] -> null
- target_tags = [] -> null
# (1 unchanged attribute hidden)
- allow {
- ports = [
- "22",
- "80",
- "3389",
] -> null
- protocol = "tcp" -> null
}
- allow {
- ports = [] -> null
- protocol = "icmp" -> null
}
}
# google_compute_network.mynetwork will be destroyed
- resource "google_compute_network" "mynetwork" {
- auto_create_subnetworks = true -> null
- delete_default_routes_on_create = false -> null
- enable_ula_internal_ipv6 = false -> null
- id = "projects/dave-terraform/global/networks/mynetwork" -> null
- mtu = 0 -> null
- name = "mynetwork" -> null
- network_firewall_policy_enforcement_order = "AFTER_CLASSIC_FIREWALL" -> null
- numeric_id = "8609352241044109862" -> null
- project = "dave-terraform" -> null
- routing_mode = "REGIONAL" -> null
- self_link = "https://www.googleapis.com/compute/v1/projects/dave-terraform/global/networks/mynetwork" -> null
# (3 unchanged attributes hidden)
}
Plan: 0 to add, 0 to change, 2 to destroy.
Do you really want to destroy all resources?
Terraform will destroy all your managed infrastructure, as shown above.
There is no undo. Only 'yes' will be accepted to confirm.
Enter a value:
