https://github.com/inscapist/terraform-k3s-private-cloud

Private cluster with k3s. Why have 1 huge complicated cluster (pet) when you can have many simple, cheap clusters (cattle)?
https://github.com/inscapist/terraform-k3s-private-cloud

aws ci-cd cloud cloud-init k3s k3s-cluster kubernetes microservices session-manager terraform

Last synced: 10 days ago
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Private cluster with k3s. Why have 1 huge complicated cluster (pet) when you can have many simple, cheap clusters (cattle)?

• Host: GitHub
• URL: https://github.com/inscapist/terraform-k3s-private-cloud
• Owner: inscapist
• License: mit
• Created: 2021-01-14T06:04:32.000Z (almost 4 years ago)
• Default Branch: main
• Last Pushed: 2022-05-10T08:38:01.000Z (over 2 years ago)
• Last Synced: 2024-10-12T00:31:09.583Z (25 days ago)
• Topics: aws, ci-cd, cloud, cloud-init, k3s, k3s-cluster, kubernetes, microservices, session-manager, terraform
• Language: HCL
• Homepage:
• Size: 83 KB
• Stars: 114
• Watchers: 6
• Forks: 14
• Open Issues: 6
• Metadata Files:
  • Readme: README.md
  • License: LICENSE
  • Security: security.tf

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README

        
# K3s Private Cluster

[![asciicast](https://asciinema.org/a/386840.svg)](https://asciinema.org/a/386840)

Asciicast for accessing cluster can be viewed [here](./docs/getting-started.md)

## Requirements

| Name      | Version      |

| --------- | ------------ |

| terraform | >= 0.14      |

| SSM Agent | >= 3.0.161.0 |

This module is published at [Terraform registry](https://registry.terraform.io/modules/sagittaros/private-cloud/k3s/latest)

## Why would you want this?

- You are cost-conscious. RDS, Elasticache and EKS are too expensive and perhaps even too complicated

- You want a cluster with low maintenance overhead and just works

- You want to have this cluster for only 1 or 2 apps (App Clusters)

## Why would I do this?

- I wish to empower individual developers to have their own test/staging environment

- Big clusters fail, coordination is hard, service mesh is expensive

- I wish our code can simply run anywhere on any cloud, even if its stateful

## Features

- Private cluster with no exposed ports

- Low memory usage and simpler architecture (thanks to K3S)

- It has most of the expected features of kubernetes (PVC, LoadBalancer, MetricsServer)

- Simple codebase with minimal magic

- Network agnostic with ability to reuse VPC

## What is this?

This module is designed for kubernetes workload that runs within private subnet. A private subnet is simply a subnet not associated with an internet gateway. This results in lower cost and reduction in moving parts, as you do not need to purchase a domain name, certificate and manage perimeter security.

If you don't need egress connectivity for cluster, you can use the [VPC endpoints for SSM](./extras/ssm_vpc_endpoints). Otherwise, session manager would not work.

This module currently supports only AWS cloud. However, I wish to support more clouds with minimal differences between API.

Various networking configurations are demonstrated in the following examples:

- [New VPC](./examples/k3s-in-new-vpc)

- [Existing VPC, New subnets](./examples/k3s-in-existing-vpc)

## How do I start?

Refer [Getting Started](./docs/getting-started.md) and other [documentation](./docs)