Microservice based shopping website written in Python and Go, deployed on Kubernetes in AWS. Personal project to learn Go, DevOps tech and CI/CD.
The application is microservices based and consists of the following services:
| Service | Language | Function |
|---|---|---|
| Frontend | Go | HTTP server to serve frontend to users |
| Carts | Go | Handles user shopping carts, stores them in Redis |
| Products | Go | Stores all products using Postgres |
| Checkout | Go | Orchestrates product checkout |
| Python | Sends a fake email to the user | |
| Shipping | Python | Generates a fake shipping ID |
| Payment | Python | Generates a fake transaction ID |
Tools/frameworks used:
- Gin for creating REST APIs
- Logrus for structured logging
- Mux for the frontend server
- Starlette as async Python webserver
- GORM as database ORM
- Redis as the cart store
- PostgreSQL as the products database
The application is container based and deployed in a Kubernetes cluster on AWS. The entire infrastructure is based on Infrastructure as Code principles, using Terraform, Kubernetes, and Ansible.
Technology and tools used:
- Kubernetes
- kubeadm
- Helm
- Istio service mesh
- Docker
- Terraform
- Ansible
- AWS
Using Terraform, the following AWS infrastructure is deployed:
This is not a best practice infrastructure due to the usage of an AWS starter account, by which I was limited to only certain AWS resources.
Using Ansible, a Kubernetes cluster with Istio service mesh is deployed. The Kubernetes cluster is formed using the kubeadm tool.
This project uses a CI/CD pipeline using the free tier of CircleCI. The pipeline is described in the .circleci folder, and based on the following steps:
- Checkout: using a CircleCI webhook, whenever a commit is pushed to the
masterbranch the build pipeline triggers; - Run unit tests: the Go unit tests are ran to check if the services still work;
- Build Docker images: after successful unit tests, a Docker container is built for each service using the
latesttag; - Push Docker images: these images are then pushed to my personal Dockerhub;
- Trigger Kubernetes Rolling Update: Ideally, the next step would be to trigger an update of all containers in Kubernetes. Unfortunately, the free version of CircleCI does not support this.