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Microservice Architectures

Danilo Poccia ‒ AWS Technical Evangelist@danilop

Why Microservices?

http://en.wikipedia.org/wiki/Multitier_architecture

As a Project scales Complexity arises

“Complexity arises when the dependencies among the elements

become important.”

Complex Adaptive Systems: An Introduction to Computational Models of Social Life

Scott E. Page, John H. Miller

Business Domain+

Loosely Coupled +

Bounded Context

Microservices

Independent Deployment

Single Responsibility Principle

“Gather together those things that change for the same reason, and

separate those things that change for different reasons.”

Robert C. Martin

Microservices

Choose the Right Tool

Microservices

Adopt New Technologies

Microservices

Culture of Automation

Adrian Cockcroft, Technology Fellow at Battery Ventures http://www.slideshare.net/adriancockcroft/goto-berlin

# Services > # Developers

How small is small?

Gall’s law

“A complex system that works is invariably found to have evolved from a simple system that worked.

A complex system designed from scratch never works and cannot be patched up to make it work.

You have to start over with a working simple system.”

Systemantics: How Systems Really Work and How They Fail, John Gall,1975

“something that could be rewritten in two weeks”

Two Pizza Teams

Conway’s law

“organizations which design systems ... are constrained to produce designs which

are copies of the communication structures of these organizations”

Melvin Conway, 1968

Architecture

Dev

Ops

Microse

rvice

s

Feature Teams

Internal Open Source

SynchronousVs

Asynchronous

OrchestrationVs

Choreography

Distributed Systems

Independent ScalabilityAuto Scaling

Distributed Systems

Eventual ConsistencyIdempotent Operations

Robustness Principle / Postel's law

“be conservative in what you do,be liberal in what you accept

from others”

(form an early TCP specification)

Security

Least Privileges

Single Sign-On

Confused Deputy Problem (downstream calls

after authentication)

Testing

Automate

Service Tests

End-to-end Tests

Synthetic Transactions

Monitoring

Correlation ID

Standard Log format

Expose Service Metrics

From Log collection to Near Real-Time Event routing

Amazon CloudWatch Logs Amazon Kinesis

Understand your trends

Discovery

Self-Describing System

Amazon Route 53 (DNS)

AWS Resource Tagging

Amazon CloudWatch Events

Deployment Pipeline

Developer

Developer

Developer

Developer

Developer

Build

Stage #1 Stage #2 … Stage #N Production

Build Build Build Build

Developer

Developer

Developer

Developer

Developer

Build

Stage #1 Stage #2 … Stage #N Production

Build Build Build Build

Bug!

Developer

Developer

Developer

Developer

Developer

Build

Stage #1 Stage #2 … Stage #N Production

Build Build Build Build

Build Build Build Build Build

Build Build Build Build Build

Developer

Developer

Developer

Developer

Developer

Build

Stage #1 Stage #2 … Stage #N Production

Build Build Build Build

Bug!

Build Build Build Build Build

Build Build Build Build Build

Design for Failure

Degrade Functionality

"Jtecul" by own - Own work. Licensed under CC BY-SA 3.0 via Wikimedia Commons

http://commons.wikimedia.org/wiki/File:Jtecul.jpg#/media/File:Jtecul.jpg

CircuitBreakers

Amazon Route 53 Private DNS in VPC

Elastic / Application Load Balancing

CircuitBreakers Health

Checks

Migration from Legacy Monolith?

Look for the right “seam”

Disposable Infrastructure

Immutable Deployments

Why Docker?

VM Container

Amazon EC2 Container Service

A highly scalable, high performance container management service

Manage containers at any scale

Launch and terminate containers to clusters of instances on EC2

Run specific tasks or long-living services

https://github.com/aws/amazon-ecs-agent

Case

Studies

Why AWS Lambda?

AWS Lambda

Event driven,fully managed compute

Amazon EC2 Containers AWS LambdaOn-Premises

Weeks Minutes Seconds Milliseconds

Netflix Architecture

Netflix Architecture

Asgard, Amimator, Hystrix, Eureka, Cassandra, JVM,

Docker, …

On AWS

Hailo Architecture

Hailo Architecture

Hubot, Janky, Jenkins, Go, RabbitMQ, Cassandra,

Docker, …

On AWS

Sample Architecture

Sample Architecture

Content Management System Prototype

On AWS

Lambda Function

S3 Bucket#1

S3 Bucket#2

DynamoDBTable

ECSTask

ECSCluster

Images +

Medatada

UploadEvent

Notification

Thumbnail

Write Metadata

Run

Schedule

Read Metadata

Write “index.html”

1

2

3

CloudFront Distribution

Edge Location

User S3 Bucket#1

S3 Bucket#2

Iterate Continous Improvement

Kaizen

Microservice Architectures

Danilo Poccia ‒ AWS Technical Evangelist@danilop