microservices: principles and in practice

December 11thMicroservices

Principles and In Practice

Definition

“Small autonomous services that work together,

modelled around a business domain”- Sam Newman -

Building Microservices

Microservices vs Monolithic services

- Martin Fowler -

Microservices vs Monolithic services

- Philip Hauer -

When scaling.

Principles of microservices

Principle 01

Small Autonomous Services

Principle 01 -Small autonomous services that work together

Merchant API

Admin API

Consumer API

Payment API

Principle 01 -Small autonomous services that work together

Merchant API

Admin API

Consumer API

Payment API

Small??Autonomous Services?Work together

Principle 01 -Small autonomous services that work together

Merchant API

Wallet API

Notifications APIEmployee Mgt API

CINCO Onboarding API Menu Related API

Rewards API

Definition

“Small autonomous services that work together,

modelled around a business domain”- Sam Newman -

Building Microservices

Principle 02

Business Domain BasedModelling

Merchant API

Wallet API

Notifications APIEmployee Mgt API

CINCO Onboarding API Menu Related API

Rewards API

Principle 02 - Business Domain Based Modelling

Principle 03

Culture of Automation

Principle 03 - Culture of Automation

Automated TestingContinuous Delivery

Lot of upfront work for a transition

Principle 04

Hide Implementation Details

Principle 04 - Hide implementation Details

Merchant API

LEAPSET DB PROFILE

DB

Consumer API

Admin API

Payment API

Drastically impacts the ability to change

Principle 04 - Hide implementation Details

Data Level APIs

LEAPSET DB

PROFILE DB

Merchant API

Easier said than done, of course.Especially for startups and where time to market is critical

Authentication Services

You need to make a request to get the data.People who manage these data level services can do their job

Decentralization

Principle 05

Microservices architecture boasts about autonomyMicroservices architecture optimizes around autonomy

Principle 05 - Decentralization

● Do we still need to rely on another party to create a new server instances?

○ I know.. I know … checks and balances are required.. that’s fine.○ Practical issues...shush!

● Do we still rely on another party for deployment?○ Deserves a separate section on its own - Mr Mumtaz will cover it

● Do we have to communicate to all other teams in the Cake ecosystem for us to push a release

● Is it a one man show? What happens if “that man” is done and dusted?○ One centralized architect? Is he the guru for everything or is to

the team that comes together..Where is brainstorming? collective decision making? Many brains against one?

● Decentralization does not mean decentralizing everything

Principle 05 - Decentralization

Principle 05 - Dumb Pipes

ESB

Merchant API Admin API Payment API IDM Other APIS

Clients

● Should not be domain aware● Cannot become too smart

Principle 06

Consumer First

Principle 06 - Consumer First

● Api Blueprint● Raml● Swagger

○ Features;■ Industry Standard - Open API Initiative (OAI) - Has announced

an open governance model around the Swagger Specification under the Linux Foundation.

■ Largest community and has been around since 2011. ■ Stub generators and Live documentation demo. Can be used

as interactive sandbox■ Open source 100%

○ Platform Swagger Url■ https://plat1-api.leapset.com:8343/sandbox/

Principle 06 - Consumer First

Principle 06 - Consumer First

● Service Discovery tools

Principle 07

Isolate FailureObserve and Debug Failure

Principle 07

● Log aggregation tools - make it highly observable.○ Logstash○ Just imagine logging into 40 servers to debug issues

● Tools that can be used for monitoring○ Cacti○ Nagios○ Graphite○ Grafana

Principle 07

● AWS Autoscaling

● Correlation Ids

Principle 08

Deploy Independently

Virtual Machine vs Containers

Docker

Docker allows you to package an application with all of its dependencies into a standardized unit for software development.

Docker

● Lightweight● Open● Secure● Accelerate Developer Onboarding

○ Eliminate Environment Inconsistencies● Easily Share and Collaborate on Applications

○ Ship More Software Faster○ Portable○ Fast

AWS Elastic Beanstalk

● An AWS Product● Infrastructure manager● Reduces management complexity without restricting choice or

control● Quickly deploy and manage applications in the AWS cloud

Demo

Demo

Demo

SF ConnectorCAKE Platform

AWS Elastic Beanstalk

Do we have a problem?

Do we have a problem?

Do we have a problem?

A Solution

Amazon ECSAmazon EC2 Container Service

Amazon ECS