DigitalOcean VPC

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Terraform module for VPC setup in DigitalOcean. Optionally, deploys Droplet and configures it as a VPC Gateway.

Once you have a Corewide Solutions Portal account, this one-time action will use your browser session to retrieve credentials:

 shellterraform login solutions.corewide.com

Provision instructions

Initialize mandatory providers:

digitalocean/digitalocean

Copy and paste into your Terraform configuration and insert the variables:

 hclmodule "tf_do_vpc" {
  source  = "solutions.corewide.com/digitalocean/tf-do-vpc/digitalocean"
  version = "~> 1.1.0"

  # specify module inputs here or try one of the examples below
  ...
}

Initialize the setup:

 shellterraform init

Define update strategy

Corewide DevOps team strictly follows Semantic Versioning Specification to provide our clients with products that have predictable upgrades between versions. We recommend pinning patch versions of our modules using pessimistic constraint operator (~>) to prevent breaking changes during upgrades.

To get new features during the upgrades (without breaking compatibility), use ~> 1.1 and run terraform init -upgrade

For the safest setup, use strict pinning with version = "1.1.0"

v1.1.0 released 8 months, 1 week ago

New version approx. every 43 weeks

Changelog

Deploy only VPC with custom IP range:

 hclmodule "vpc" {
  source  = "solutions.corewide.com/digitalocean/tf-do-vpc/digitalocean"
  version = "~> 1.1"

  name_prefix = "foo"
  region      = "fra1"
  cidr_block  = "10.114.32.0/20"
}

Deploy VPC and gateway droplet with minimum configuration:

 hclmodule "vpc" {
  source  = "solutions.corewide.com/digitalocean/tf-do-vpc/digitalocean"
  version = "~> 1.1"

  name_prefix = "foo"
  region      = "fra1"

  gateway = {}
}

Full module configuration - deploy VPC with custom IP range, deploy and configure gateway droplet with minimal instance size, custom SSH keys and reserved IP address using cloud-init:

 hclmodule "vpc" {
  source  = "solutions.corewide.com/digitalocean/tf-do-vpc/digitalocean"
  version = "~> 1.1"

  name_prefix = "foo"
  region      = "fra1"
  cidr_block  = "10.114.32.0/20"
  description = "Module usage example"

  gateway = {
    size = "s-1vcpu-1gb"

    tags = [
      "application",
    ]

    ssh_keys = [
      digitalocean_ssh_key.main.fingerprint,
    ]
  }
}

To configure backend droplets to use the VPC gateway, follow the example below or use the official tutorial.
Routing droplet traffic via GW. Create a droplet and configure it using cloud-init config:

Note: Cloud yaml config must begin with #cloud-config comment

 hclresource "digitalocean_droplet" "backend" {
  image    = "ubuntu-22-10-x64"
  name     = "backend"
  region   = "fra1"
  size     = "s-1vcpu-1gb"
  vpc_uuid = module.vpc.vpc.id

  ssh_keys = [
    digitalocean_ssh_key.main.fingerprint,
  ]

  # Provide cloud-init script to configure gateway
  user_data = join("
", [
    "#cloud-config",
    yamlencode({
      runcmd = [
        # Add an IP route to your network configuration so the Droplet can retain access to its metadata endpoint (169.254.169.254)
        "ip route add 169.254.169.254 via $(curl -s http://169.254.169.254/metadata/v1/interfaces/public/0/ipv4/gateway) dev $(route|awk '/^default/{print $NF}')",
        # Add new gateway Droplet IP route to the backend Droplet network configuration
        "ip route change default via ${module.vpc.gateway_ips.private_ip}"
      ]
    }),
  ])
}

Variable	Description	Type	Default	Required	Sensitive
`name_prefix`	Naming prefix for all the resources created by the module	`string`		yes	no
`region`	Digital Ocean region to create resources in	`string`		yes	no
`cidr_block`	The parameters for VPC creation	`string`		no	no
`description`	A free-form text field up to a limit of 255 characters to describe the VPC	`string`		no	no
`gateway`	The parameters for Gateway Droplet creation	`object`		no	no
`gateway.size`	The machine type for GW droplet to use	`string`	`s-1vcpu-1gb`	no	no
`gateway.ssh_keys`	A list of SSH key IDs or fingerprints to authorize	`list(string)`	`[]`	no	no
`gateway.tags`	A list of the tags to be applied to this Droplet	`list(string)`	`[]`	no	no

Output	Description	Type	Sensitive
`gateway_ips`	Contains `public_ip` and `private_ip` of the Gateway Droplet	`computed`	no
`gateway_urn`	URN of gateway droplet	`computed`	no
`reserved_ip_urn`	URN of reserved IP	`computed`	no
`vpc`	VPC resource attributes	`resource`	no