tf-aws-module_primitive-appmesh_virtual_node

Overview

This terraform module creates a Virtual Node in a Service Mesh provided as input.

Usage

A sample variable file example.tfvars is available in the root directory which can be used to test this module. User needs to follow the below steps to execute this module

1. Update the example.tfvars to manually enter values for all fields marked within <> to make the variable file usable
2. Create a file provider.tf with the below contents

    provider "aws" {
      profile = "<profile_name>"
      region  = "<region_name>"
    }
   

   If using SSO, make sure you are logged in aws sso login --profile <profile_name>
3. Make sure terraform binary is installed on your local. Use command type terraform to find the installation location. If you are using asdf, you can run asfd install and it will install the correct terraform version for you. .tool-version contains all the dependencies.
4. Run the terraform to provision infrastructure on AWS

   # Initialize
   terraform init
   # Plan
   terraform plan -var-file example.tfvars
   # Apply (this is create the actual infrastructure)
   terraform apply -var-file example.tfvars -auto-approve
   

Known Issues and Facts

1. The health checks in the listener checks the health of the underlying service and logs it, but doesn't evict the ECS task in case of failures.

Pre-Commit hooks

.pre-commit-config.yaml file defines certain pre-commit hooks that are relevant to terraform, golang and common linting tasks. There are no custom hooks added.

commitlint hook enforces commit message in certain format. The commit contains the following structural elements, to communicate intent to the consumers of your commit messages:

• fix: a commit of the type fix patches a bug in your codebase (this correlates with PATCH in Semantic Versioning).
• feat: a commit of the type feat introduces a new feature to the codebase (this correlates with MINOR in Semantic Versioning).
• BREAKING CHANGE: a commit that has a footer BREAKING CHANGE:, or appends a ! after the type/scope, introduces a breaking API change (correlating with MAJOR in Semantic Versioning). A BREAKING CHANGE can be part of commits of any type. footers other than BREAKING CHANGE: may be provided and follow a convention similar to git trailer format.
• build: a commit of the type build adds changes that affect the build system or external dependencies (example scopes: gulp, broccoli, npm)
• chore: a commit of the type chore adds changes that don't modify src or test files
• ci: a commit of the type ci adds changes to our CI configuration files and scripts (example scopes: Travis, Circle, BrowserStack, SauceLabs)
• docs: a commit of the type docs adds documentation only changes
• perf: a commit of the type perf adds code change that improves performance
• refactor: a commit of the type refactor adds code change that neither fixes a bug nor adds a feature
• revert: a commit of the type revert reverts a previous commit
• style: a commit of the type style adds code changes that do not affect the meaning of the code (white-space, formatting, missing semi-colons, etc)
• test: a commit of the type test adds missing tests or correcting existing tests

Base configuration used for this project is commitlint-config-conventional (based on the Angular convention)

If you are a developer using vscode, this plugin may be helpful.

detect-secrets-hook prevents new secrets from being introduced into the baseline. TODO: INSERT DOC LINK ABOUT HOOKS

In order for pre-commit hooks to work properly

• You need to have the pre-commit package manager installed. Here are the installation instructions.
• pre-commit would install all the hooks when commit message is added by default except for commitlint hook. commitlint hook would need to be installed manually using the command below

pre-commit install --hook-type commit-msg

To test the resource group module locally

1. For development/enhancements to this module locally, you'll need to install all of its components. This is controlled by the configure target in the project's Makefile. Before you can run configure, familiarize yourself with the variables in the Makefile and ensure they're pointing to the right places.

make configure

This adds in several files and directories that are ignored by git. They expose many new Make targets.

2. The first target you care about is env. This is the common interface for setting up environment variables. The values of the environment variables will be used to authenticate with cloud provider from local development workstation.

make configure command will bring down aws_env.sh file on local workstation. Developer would need to modify this file, replace the environment variable values with relevant values.

These environment variables are used by terratest integration suit.

Then run this make target to set the environment variables on developer workstation.

make env

3. The first target you care about is check.

Pre-requisites Before running this target it is important to ensure that, developer has created files mentioned below on local workstation under root directory of git repository that contains code for primitives/segments. Note that these files are aws specific. If primitive/segment under development uses any other cloud provider than AWS, this section may not be relevant.

• A file named provider.tf with contents below

provider "aws" {
  profile = "<profile_name>"
  region  = "<region_name>"
}

• A file named terraform.tfvars which contains key value pair of variables used.

Note that since these files are added in gitignore they would not be checked in into primitive/segment's git repo.

After creating these files, for running tests associated with the primitive/segment, run

make check

If make check target is successful, developer is good to commit the code to primitive/segment's git repo.

make check target

• runs terraform commands to lint,validate and plan terraform code.
• runs conftests. conftests make sure policy checks are successful.
• runs terratest. This is integration test suit.
• runs opa tests

Know Issues

Currently, the encrypt at transit is not supported in terraform. There is an open issue for this logged with Hashicorp - hashicorp/terraform-provider-aws#26987

Requirements

Name	Version
terraform	~> 1.0
aws	~> 5.0

Providers

Name	Version
aws	5.73.0

Modules

No modules.

Resources

Name	Type
aws_appmesh_virtual_node.this	resource

Inputs

Name	Description	Type	Default	Required
name	Name of the Virtual Node	string	n/a	yes
app_mesh_id	ID of the App Mesh to use	string	n/a	yes
tls_enforce	Whether to enforce TLS on the backends	bool	false	no
tls_mode	Mode of TLS. Default is STRICT. Allowed values are DISABLED, STRICT and PERMISSIVE. This is required when tls_enforce=true	string	"STRICT"	no
acm_certificate_arn	ARN of the private certificate to enforce TLS configuration on the Virtual Node	string	n/a	yes
certificate_authority_arns	List of ARNs of private CAs to validate the private certificates	list(string)	[]	no
namespace_name	Name of the CloudMap Namespace to use for Service Discovery	string	""	no
service_name	CloudMap Service Name to use for this Virtual Node service Discovery	string	""	no
dns_hostname	DNS hostname for the Virtual Node to point at. Conflicts with Service Discovery	string	""	no
ports	Application ports	list(number)	[]	no
protocol	Protocol used for port mapping. Valid values are http, http2, tcp and grpc. Currently this same protocol will be used for all listeners	string	"http"	no
health_check_config	n/a	object({ healthy_threshold = number interval_millis = number timeout_millis = number unhealthy_threshold = number })	{ "healthy_threshold": 2, "interval_millis": 50000, "timeout_millis": 50000, "unhealthy_threshold": 3 }	no
health_check_path	Destination path for the health check request	string	""	no
idle_duration	Idle duration for all the listeners	object({ unit = string value = number })	null	no
per_request_timeout	Per Request timeout for all the listeners	object({ unit = string value = number })	null	no
tags	A map of custom tags to be attached to this resource	map(string)	{}	no

Outputs

Name	Description
id	ID of the Virtual Node.
arn	ARN of the Virtual Node
name	Name of the Virtual Node
spec	Node Spec