This presentation is conducted on 14th Sept in Limerick DotNet User Group. (https://www.meetup.com/preview/Limerick-DotNet/events/xskpdnywmbsb) SlideShare Url: https://www.slideshare.net/lalitkale/introduction-to-microservices-80583928 In this presentation, new architectural style - Microservices and it's emergence is discussed. We will also briefly touch base on what are not microservices, Conway's law and organization design, Principles of microservices and service discovery mechanism and why it is necessary for microservices implementation. About Speaker: Lalit is a senior developer, software architect and consultant with more than 12 yrsof .NET experience. He loves to work with C# .NET and Azure platform services like App Services, Virtual Machines, Cortana, and Container Services. He is also the author of 'Building Microservices with .NET Core' (https://www.packtpub.com/web-development/building-microservices-net-core) book. To know more and connect with Lalit, you can visit his LinkedIn profile below. https://www.linkedin.com/in/lalitkale/ This presentation will be useful for software architects/Managers, senior developers. Do share your feedback in comments.

1. Lalit Kale
@atechiethought
Introduction To Microservices
Limerick DotNet Azure User Group (LDNA)

2. About Me
• 12 years of .NET
• Roles: Software Developer  Sr. Developer  Tech Lead Architect
• Limerick DotNet Azure Meetup Organizer
Limerick DotNet Azure User Group (LDNA)

3. Limerick DotNet Azure User Group (LDNA)
Sponsors – Thank You!

4. Why Microservices?

5. Why Microservices?
• As a business transformational instrument in
• Organizational Restructuring
• Supporting hyper-scale growth
• Scaling business capabilities
• Provides Business Agility and faster pace to delivery
• Unlocks experimentation and learning capabilities on organizational
level which is not at all possible with Monolithic architectures

6. What are Microservices?

7. Monolith and Microservices
Monolith Microservices

8. Martin Fowler on Microservices
• 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 HTTP resource API.
• These services are built around business capabilities and independently
deployable by fully automated deployment machinery.
• There is a bare minimum of centralized management of these services,
which may be written in different programming languages and use
different data storage technologies.

9. Every microservice is different, yet they share some common characteristics.
Microservices

10. Principles of Microservices
Deployment
Technology
Versions
Languages
Infrastructure
Operations
Developme
nt
Testing
Security
Fail
Predictably
No SPoF
Automated
Recovery
Based on Business
Capability
Single
Responsibility
Hide
‘Implementation’
Independence Independence Independence IsolationIndependence Automation Fail-Safe

11. What is NOT Microservices?

12. What is NOT Microservices?
Refactor monolithic application into smaller services??

13. Monolith
If you force monolith to get Microservices any which way, all you can get is Microlith
Microservice?
Microlith
Monolith
What is NOT Microservices?

14. What is NOT Microservice?

15. Microservices Pre-requisites

16. Conway’s Law
"Any organization that designs a system (defined more broadly here
than just information systems) will inevitably produce a design whose
structure is a copy of the organization's communication structure.“
-Melvin Conway

17. Conway’s Law

18. Conway’s Law
Org Structure Architectural Capabilities

19. Reversing the Conway’s Law
• Two Pizza Teams focused on Business Capability
• You Build it, You Run it!
• Microservices

20. Designing Microservices

21. Designing Microservices
• ‘Micro’ is misleading most of implementations
• It is NOT about how many lines of code in your microservice have
• Should be Manageable by a small, self-sufficient team
• Evolutionary design

22. Designing Microservices
• Service = Business Capability
• Single Responsibility Principle(SRP)
• Find the Seams around Service Boundary.
• DDD – Follow Bounded Context Pattern
• Follow Consumer Driven Contracts

23. Designing Microservices - Tips
• Ensure independent development and deployment of the service
• Focus more on the scope of the microservice, but not about
making the service smaller
• SOA = Coarse Grain Services while microservice should have a very
few operations/functionalities and simple message format.
• It is often a good practice to start with relatively broad service
boundaries to begin with, refactoring to smaller ones (based on
business requirements) as time goes on.

24. Microservices Interactions

25. Microservices Interactions
• Orchestration vs. Choreography

26. Microservices Interactions
• Understanding Message Queue, Message Bus
• FIFO
• Same system different processes
• Separate queues for separate
• dependent Process
• No sequential preference
• Pub-Sub Mechanism
• Single Message bus for connecting
different applications

27. Microservices Interactions
• API Gateway
• Event Sourcing
• Eventual Consistency
• Compensating Transaction

28. Microservices Deployment

29. Microservices Deployment
• Understanding Isolation
• Importance of Containers Breakthrough
• Infrastructure as code

30. Operations
• Pet Vs. Cattle Mindset
• Logging & Monitoring
• What to measure?
• Co-relation Id
• Tools: Elastic.io , Splunk, Fluentd, Sensu, Prometheus, Azure Log Analytics,
Diagnostics Log, Auditing

31. Microservices Scaling

32. Infrastructure Scaling
VM Scale
Sets
Azure Container
Service
Kubernetes
Docker Swarm
DC/OS
Pivotal Cloud
Foundry
App Service
Azure Functions
Docker
Containers
Web/api/mobile
apps
Service Fabric
Orchestrator
Custom
Programming
Model
Host-Guest
Executable
Elastic &
Declarative
Open source
High-Density
Open source
PaaS
Web/Mobile/
Serverless
Stateful &
Stateless

33. AFK Scale Cube

34. Circuit Breaker Pattern

35. Scaling Service Design - Service Discovery

36. Client Side Service Discovery
• Azure Load Balancer
• Application Gateway
• Netflix Eureka

37. Server-side Service Discovery
• Consul
• Etcd
• Zookeeper

38. Demo
Service Discovery using Consul

39. Questions and Answers

40. .
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