README.md

Kubernetes - Istio Terraform Module

GitHub Actions:

Infracost:

💵 Monthly estimates based on Infracost baseline costs.

Repository Description

Terraform example module for Istio on Google Kubernetes Engine (GKE).

Note

We do not recommend consuming this module like you might a public module. It is a baseline, something you can fork, potentially maintain, and modify to fit your organization's needs. Using public modules vs. writing your own has various drivers and trade-offs that your organization should evaluate.

🔩 Usage

Tip

You can check the tests/fixtures directory for example configurations. These fixtures set up the system for testing by providing all the necessary initial code, thus creating good examples on which to base your configurations.

Development

Our focus is on the core fundamental practice of platform engineering, Infrastructure as Code.

Open Source Infrastructure (as Code) is a development model for infrastructure that focuses on open collaboration and applying relative lessons learned from software development practices that organizations can use internally at scale. - Open Source Infrastructure (as Code)

To avoid slowing down stream-aligned teams, we want to open up the possibility for contributions. The Open Source Infrastructure (as Code) model allows team members external to the platform team to contribute with only a slight increase in cognitive load. This section is for developers who want to contribute to this repository, describing the tools used, the skills, and the knowledge required, along with Terraform documentation.

See the documentation for setting up a local development environment here.

🛠️ Tools

• checkov
• helm
• infracost
• pre-commit
• pre-commit-terraform
• terraform-docs

📋 Skills and Knowledge

Links to documentation and other resources required to develop and iterate in this repository successfully.

• istio
  • istio on gke

🔍 Tests

All tests are mocked allowing us to test the module without creating infrastructure or requiring credentials. The trade-offs are acceptable in favor of speed and simplicity. In a Terraform test, a mocked provider or resource will generate fake data for all computed attributes that would normally be provided by the underlying provider APIs.

terraform init

terraform test

📓 Terraform Documentation

A child module automatically inherits default (un-aliased) provider configurations from its parent. The provider versions below are informational only and do not need to align with the provider configurations from its parent.

Requirements

No requirements.

Providers

Name	Version
google	6.14.1
google-beta	6.14.1

Modules

No modules.

Resources

Name	Type
google-beta_google_compute_security_policy.istio_gateway	resource
google_compute_global_address.istio_gateway_mci	resource
google_compute_managed_ssl_certificate.istio_gateway_mci	resource
google_compute_ssl_policy.istio_gateway	resource
google_dns_record_set.istio_gateway_mci	resource

Inputs

Name	Description	Type	Default	Required
gateway_dns	Map of attributes for the Istio gateway domain names, it is also used to create the managed certificate resource	map(object({ managed_zone = string project = string }))	{}	no
gke_fleet_host_project_id	The project ID of the GKE Hub host project	string	""	no
labels	A map of key/value pairs to assign to the resources being created	map(string)	{}	no
project	The ID of the project in which the resource belongs	string	n/a	yes

Outputs

Name	Description
gateway_mci_global_address	The IP address for the Istio Gateway multi-cluster ingress
gateway_mci_ssl_certificate_name	The name of the SSL certificate for the Istio Gateway multi-cluster ingress

📓 Terraform Regional Documentation

• regional
• regional/manifests