local-k8s-demo

📝 Objectives

Create a simple project that highlights a basic development environment with k8s.

• Monorepo
• Web Application / API
• Worker Service
• Database
• Queue
• Event based auto scaling

This project is a POC and not intended for production use

What this project is not intended to provide:

• A set of best practices for k8s development/deployment
• A set of best practices for event driven architecture
• High quality code or testing

💻 Tech Stack

• TypeScript
• RancherDesktop
• NextJS
• Prisma
• Tilt
• TurboRepo
• Kubegres
• RabbitMQ
• Keda

🏗️ Setup

This application can run entirely in containers on k8s. We first need to setup the basic system prerequisites.

⚙️ System Prerequisites

• Install NodeJS - Recommended via ASDF
  • This is not entirely necessary, but it is helpful being able to interact with the project locally.
• Install Rancher Desktop
• Enable Kubernetes in Rancher Desktop
• Install Tilt

🌎 Environment Variables

• This application is geared towards using environment variables for configurations and secrets. All custom values can be set in a .env file set in the /k8s/secrets directory

  • Update .env.k8s.example to .env.k8s with the desired values you need. By default the only values in here are specific to setting the default database password.

• The queue (RabbitMQ) sets the default user/password values as part of the default behavior of the operator. Those can be found in the queue-default-user secret on the k8s cluster once a queue service has been deployed.

• The baseline configuration for the application to run locally is stored in the root of the project in an .env file. This is for running the project just using Turborepo and not within something like k8s. Review the .env.example in the root directory to reference the required variables.

🛠️ K8S Cluster Setup

Once k8s is up and running we have to install some k8s operators

Postgresql

kubectl apply -f "https://raw.githubusercontent.com/reactive-tech/kubegres/v1.16/kubegres.yaml"

RabbitMQ

kubectl apply -f "https://github.com/rabbitmq/cluster-operator/releases/latest/download/cluster-operator.yml"

Keda

kubectl apply -f "https://github.com/kedacore/keda/releases/download/v2.9.0/keda-2.9.0.yaml"

Database Setup

prisma migrate dev

💡 k8s Helpful Commands

Clean up images and restore space

nerdctl -n "k8s.io" system prune -a