Monolith to Microservices

Udagram is a simple cloud application developed alongside the Udacity Cloud Engineering Nanodegree. It allows users to register and log into a web client, post photos to the feed, and process photos using an image filtering microservice.

Prerequisites

Docker

Instructions for installing Docker can be found here.

Kubernetes

Kubernetes Cluster

• Minikube: Instructions for installing Minikube can be found here
• KubeOne: Instructions for installing KubeOne can be found here (Linux and macOS only)
• Docker Desktop: For macOS and Windows it is recommended to install Kubernetes by enabling it in Docker Desktop

Kubernetes CLI

It is recommended to use kubectl for managing the Kubernetes cluster. Intructions for installing kubectl can be found here.

Travis CI

Instructions for installing Travis CI with a GitHub repository can be found here.

Dependencies

• Amazon Web Services S3 - Bucket for image storage
• Amazon Web Services RDS - Postgres database instance
• Amazon Web Services IAM account (optional)

Getting Started

Settings

The following settings are required by the application:

• AWS_BUCKET - S3 bucket name
• AWS_REGION - AWS region
• AWS_PROFILE - AWS profile
• JWT_SECRET - JWT token secret
• POSTGRESS_DB - Postgres database name
• POSTGRESS_HOST - URL of Postgres database instance
• POSTGRESS_PASSWORD - Database password
• POSTGRESS_USERNAME - Database username
• URL - Application URL

Docker Environment

Open a new terminal within the project directory and run:

1. Build the images: docker-compose -f docker-compose-build.yaml build --parallel
2. Push the images: docker-compose -f docker-compose-build.yaml push
3. Start the containers: docker-compose up

Kubernetes Environment

1. Setup secret keys and configmaps (aws-secret, env-secret, env-configmap)
2. Apply secret keys and configmap: kubectl apply -f aws-secret.yaml -f env-secret.yaml -f env-configmap.yaml
3. Apply deployments: kubectl apply -f backend-feed-deployment.yaml -f backend-user-deployment.yaml -f frontend-deployment.yaml -f reverseproxy-deployment.yaml
4. Apply services: kubectl apply -f backend-feed-service.yaml -f backend-user-service.yaml -f frontend-service.yaml -f reverseproxy-Service.yaml

Travis CI

1. Setup environment variables for Docker Hub credentials
2. Setup application environment variables (as above)
3. Push latest changes to the repository
4. Build application with Travis CI

Acknowledgements

This project was bootstrapped with https://github.com/scheeles/cloud-developer/tree/06-ci/course-03/exercises.