Microservices

What?

The microservice architectural style is an approach to developing a single application as a suite of small services, each running in its own process and communicating with lightweight mechanisms, often an HTTP resource API.

Source: https://martinfowler.com/articles/microservices.html

Example?

Advantages

• Scalability
• Fault isolation 
• Simple code base
• No technology barriers

Monolithic System

FIRST DEPLOYMENT

Prod & Non-Prod environment

N-TH DEPLOYMENT

Non-Prod environment

N-TH DEPLOYMENT

Prod environment

Problem

• DB Import
• DB size increases over time
• Deployment & Rollbacks are hard
• (Auto) Scaling is complex (multi nodes)
• Slow dev builds

Stateless

FIRST & N-TH DEPLOYMENT

Prod & Non-Prod environment

Advantages

• Zero downtime deployment & rollback
• Same process for all environments
• Versioning done by git branch/tag
• Easy to scale

Notes

• Restricted edit points (better to keep one)
• Additional step to export content
• Additional deployment steps to sync Prod
• Managing admin users and passwords (Security)

Workflow

Content  Editor Workflow

Developer Workflow

Implementation

Drupal

Sample Data

Data flow

1

2

3

Github

CircleCI

Branch: gh-pages

Output