Automating the Deployment of Networks with Terraform

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1 year ago

“Automating the Deployment of Networks with Terraform”

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Di lab ini, Anda akan membuat konfigurasi Terraform dengan modul untuk mengotomatiskan penerapan jaringan kustom dengan resource. Secara khusus, Anda menerapkan 3 jaringan dengan aturan firewall dan instance VM, seperti yang ditampilkan dalam diagram jaringan ini:

Praktikum

Task 1. Set up Terraform and Cloud Shell

Install Terraform

Download Terraform

wget https://releases.hashicorp.com/terraform/1.2.7/terraform_1.2.7_linux_amd64.zip

Unzip Terraform by running the following command:

unzip terraform_1.2.7_linux_amd64.zip

Set the PATH environmental variable to Terraform binaries:

export PATH="$PATH:$HOME/terraform"
cd /usr/bin
sudo ln -s $HOME/terraform
cd $HOME
source ~/.bashrc

Confirm the Terraform installation by running the following command:

terraform --version

Export the Google Cloud project into an environment variable by running the following command in Cloud Shell:

export GOOGLE_PROJECT=$(gcloud config get-value project)

Create a directory for your Terraform configuration by running the following command:

mkdir tfnet

In Cloud Shell, click Open Editor to open Cloud Shell Editor. Click Open in a new window if required.
Expand the tfnet folder in the left pane of the code editor.

Initialize Terraform

To create a new file in the tfnet folder, click File > New File.
Name the new file provider.tf, and then open it.
Copy the code into provider.tf:

provider "google" {}

Initialize Terraform by running the following commands:

cd tfnet
terraform init

Task 2. Create managementnet and its resources

Configure managementnet

To create a new file, click File > New File.
Name the new file managementnet.tf, and then open it.
Copy the following base code into managementnet.tf:

# Create the managementnet network
resource [RESOURCE_TYPE] "managementnet" {
name = [RESOURCE_NAME]
#RESOURCE properties go here
}

In managementnet.tf, replace [RESOURCE_TYPE] with "google_compute_network".
In managementnet.tf, replace [RESOURCE_NAME] with "managementnet".
Add the following property to managementnet.tf:

auto_create_subnetworks = "false"

Verify that managementnet.tf looks like this:

 # Create managementnet network
 resource "google_compute_network" "managementnet" {
   name                    = "managementnet"
   auto_create_subnetworks = false
 }

To save managementnet.tf, click File > Save.

Add a subnet to managementnet

Add the following resource to managementnet.tf:

# Create managementsubnet-us subnetwork
resource "google_compute_subnetwork" "managementsubnet-us" {
  name          = "managementsubnet-us"
  region        = "us-central1"
  network       = google_compute_network.managementnet.self_link
  ip_cidr_range = "10.130.0.0/20"
}

To save managementnet.tf, click File > Save.

Configure the firewall rule

Add the following base code to managementnet.tf:

# Add a firewall rule to allow HTTP, SSH, RDP and ICMP traffic on managementnet
resource [RESOURCE_TYPE] "managementnet-allow-http-ssh-rdp-icmp" {
name = [RESOURCE_NAME]
  source_ranges = [
    "0.0.0.0/0"
  ]
#RESOURCE properties go here
}

In managementnet.tf, replace [RESOURCE_TYPE] with "google_compute_firewall":
In managementnet.tf, replace [RESOURCE_NAME] with "managementnet-allow-http-ssh-rdp-icmp".
Add the following property to managementnet.tf:

network = google_compute_network.managementnet.self_link

Add the following properties to managementnet.tf:

allow {
    protocol = "tcp"
    ports    = ["22", "80", "3389"]
  }
allow {
    protocol = "icmp"
  }

To save managementnet.tf, click File > Save

Configure the VM instance

To create a new folder inside tfnet, select the tfnet folder, and then click File > New Folder.
Name the new folder instance.
To create a new file inside instance, select the instance folder, and then click File > New File.
Name the new file main.tf, and then open it.
Copy the following base code into main.tf:

resource [RESOURCE_TYPE] "vm_instance" {
name = [RESOURCE_NAME]
#RESOURCE properties go here
}

in main.tf, replace [RESOURCE_TYPE] with "google_compute_instance".
In main.tf, replace [RESOURCE_NAME] with var.instance_name.
Add the following properties to main.tf:

zone         = var.instance_zone
machine_type = var.instance_type

Add the following properties to main.tf:

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

Add the following properties to main.tf:

  network_interface {
    subnetwork = var.instance_subnetwork
    access_config {
      # Allocate a one-to-one NAT IP to the instance
    }
  }

Define the 4 input variables at the top of main.tf and verify that main.tf looks like this, including brackets {}:

variable "instance_name" {}
variable "instance_zone" {}
variable "instance_type" {
  default = "n1-standard-1"
}
variable "instance_subnetwork" {}
resource "google_compute_instance" "vm_instance" {
  name         = var.instance_name
  zone         = var.instance_zone
  machine_type = var.instance_type
  boot_disk {
    initialize_params {
      image = "debian-cloud/debian-11"
    }
  }
  network_interface {
    subnetwork = var.instance_subnetwork
    access_config {
      # Allocate a one-to-one NAT IP to the instance
    }
  }
}

To save main.tf, click File > Save.
Add the following VM instance to managementnet.tf:

# Add the managementnet-us-vm instance
module "managementnet-us-vm" {
  source              = "./instance"
  instance_name       = "managementnet-us-vm"
  instance_zone       = "us-central1-a"
  instance_subnetwork = google_compute_subnetwork.managementsubnet-us.self_link
}

To save managementnet.tf, click File > Save.

Create managementnet and its resources

Rewrite the Terraform configurations files to a canonical format and style by running the following command:

terraform fmt
terraform init
terraform plan
terraform apply
yes

Verify managementnet and its resources

In the Cloud Console, select Navigation menu > VPC network > VPC networks.
View the managementnet VPC network with its subnetwork.
In the left pane, click Firewall.
View the managementnet_allow_http_ssh_rdp_icmp firewall rule for the VPC network that was created.
Select Navigation menu > Compute Engine > VM instances.
Note the managementnet-us-vm instance.
Return to Cloud Shell.

Task 3. Create privatenet and its resources

Configure privatenet

To create a new file in the tfnet folder, click File > New File.
Name the new file privatenet.tf, and then open it.
Add the VPC network by copying the following code into privatenet.tf:

# Create privatenet network
resource "google_compute_network" "privatenet" {
  name                    = "privatenet"
  auto_create_subnetworks = false
}

Add the privatesubnet-us subnet resource to privatenet.tf:

# Create privatesubnet-us subnetwork
resource "google_compute_subnetwork" "privatesubnet-us" {
  name          = "privatesubnet-us"
  region        = "us-central1"
  network       = google_compute_network.privatenet.self_link
  ip_cidr_range = "172.16.0.0/24"
}

Add the privatesubnet-eu subnet resource to privatenet.tf:

# Create privatesubnet-eu subnetwork
resource "google_compute_subnetwork" "privatesubnet-eu" {
  name          = "privatesubnet-eu"
  region        = "europe-west1"
  network       = google_compute_network.privatenet.self_link
  ip_cidr_range = "172.20.0.0/24"
}

To save privatenet.tf, click File > Save.

Configure the firewall rule

Add the firewall resource to privatenet.tf:

# Create a firewall rule to allow HTTP, SSH, RDP and ICMP traffic on privatenet
resource "google_compute_firewall" "privatenet-allow-http-ssh-rdp-icmp" {
  name    = "privatenet-allow-http-ssh-rdp-icmp"
    source_ranges = [
    "0.0.0.0/0"
  ]
  network = google_compute_network.privatenet.self_link
  allow {
    protocol = "tcp"
    ports    = ["22", "80", "3389"]
  }
  allow {
    protocol = "icmp"
  }
}

To save privatenet.tf, click File > Save.

Configure the VM instance

Add the VM instance resource to privatenet.tf:

# Add the privatenet-us-vm instance
module "privatenet-us-vm" {
  source              = "./instance"
  instance_name       = "privatenet-us-vm"
  instance_zone       = "us-central1-a"
  instance_subnetwork = google_compute_subnetwork.privatesubnet-us.self_link
}

To save privatenet.tf, click File > Save.

Create privatenet and its resources

Rewrite the Terraform configurations files to a canonical format and style by running the following command:

terraform fmt
terraform init
terraform plan
terraform apply

Verify privatenet and its resources

In the Cloud Console, select Navigation menu > VPC network > VPC networks.
View the privatenet VPC network with its subnetworks.
In the left pane, click VPC network > Firewall.
View the privatenet_allow_http_ssh_rdp_icmp firewall rule for the VPC network that was created.
Select Navigation menu > Compute Engine > VM instances.
Note the internal IP addresses for privatenet-us-vm.
For managementnet-us-vm, click SSH to launch a terminal and connect.
To test connectivity to privatenet-us-vm‘s internal IP address, run the following command in the SSH terminal (replacing privatenet-us-vm’s internal IP address with the value noted earlier):

ping -c 3 <Enter privatenet-us-vm's internal IP here>

Task 4. Create mynetwork and its resources

Configure mynetwork

To create a new file in the tfnet folder, click File > New File.
Name the new file mynetwork.tf, and then open it.
Copy the following code into mynetwork.tf:

# Create the mynetwork network
resource "google_compute_network" "mynetwork" {
name                    = "mynetwork"
#RESOURCE properties go here
}

Add the following property to mynetwork.tf

auto_create_subnetworks = "true"

Verify that mynetwork.tf looks like this:

# Create the mynetwork network
resource "google_compute_network" "mynetwork" {
  name                    = "mynetwork"
  auto_create_subnetworks = true
}

To save mynetwork.tf, click File > Save.

Penutup

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