virtual/microservices-blog

Microservices Blog

Section 2: A Mini-Microservices App

• which services will we recreate? One separate service for every resource in our app: Posts and Comments
• Consider the goals and responsibilities of each service
• Dependencies: comments will have to know to tie to certain (existing) post

App steps

1. Create a new app via create react app npx create-react-app client
2. Create an express-based project for the posts service mkdir posts, cd posts, npm init -y, npm install express cors axios nodemon
3. Create an express-based project for the comments service, repeat posts process

Service responsibilities:

Posts

• Create a post
• List all posts

Comments

• Create a comment
• List all comments

Determine React component hierarchy

• App
  • PostList
    • CommentList
    • CommentCreate
  • PostCreate

Create the event bus / query services

• Listen for events
• Change React app to look at query for posts/comments for READing data only
• Posts and Comments services are still used for creating
• Instead of passing the post ID to the CommentsList component, pass the post object returned from query service

Deployments

• Create Dockerfile in each (query, posts, etc) service folder
• Push Docker images to Docker hub
• Create depl.yaml files for each K8s config; has K8s Service and Deployment information for each
• Add Ingress (ingress-nginx) for communication between clusters/pods and Load Balancer
• Add localhost host routes to /etc/host

Skaffod

• Install Skaffold
• Run with skaffold dev