Microservices - An Overview

Ganesh Samarthyam

Ignore the march of technology at your

own peril

Microservices is an architectural style

Complex application = composed of tiny services

Communicate over REST API

HTTP GET

HTTP PUT

HTTP POST

HTTP DELETE

Underlying philosophy

“do one thing and do it well”

Unix pipes analogy

$ cat limerick.txt There was a young lady of Niger Who smiled as she rode on a tiger. They returned from the ride With the lady inside And a smile on the face of the tiger.

$ cat limerick.txt | tr -s ' \t\n\r\f' \\n | sort | uniq -c | sort -r | head -5 4 the 3 a 2 tiger. 2 on 2 of

Each of these commands “cat”, “tr”, “sort”, “uniq”, and “head” do one thing

and do that well

They communicate over text; services communicate

over REST

Who uses microservices?

Monolithic

Microservices

Conway’s law“Any organization that designs a system… will inevitably produce

a design whose structure is a copy of the organization's communication structure”

Conway’s lawTeam 1

Team 2Team 3

Team 4

Conway’s law

Team 1 Team 2

Team 3

Team 4

Monolithic to microservices

Monolithic to microservices

Microservices = “fine grained SOA” or “SOA 2.0”

Service = manageable by “two pizza” team

Service = a team can DURS (Deploy, Update, Replace, Scale)

Microservices = Damn U R Sexy

Amazon case study

2-tier architecture SOA Microservices

Security

Microservices expose a lot more functionality over the network => must ensure secure access

Web resources• Wikipedia entry for microservices • Martin Fowler’s article that provides an overview of micro services • Description of micro services architecture pattern • James Lewis’s podcast in SE-Radio on microservices • Migration to microservices by Adrian Cockcroft (Netflix) • From monolith to microservices by Randy Shoup

Related books

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