Modern Microservices Architecture with Docker
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The document discusses modern microservices architecture utilizing Docker, emphasizing the importance of high cohesion and low coupling in software design. It outlines the challenges faced in maintaining quality and managing changes in a 24/7 system and highlights Docker's role in simplifying the use of containers for software deployment. Additionally, it addresses both the benefits and drawbacks of microservices, advocating for planning and devops strategies to mitigate complexity.
Modern Microservices Architecture with Docker
- 1. Modern Microservices Architecture with Docker Alon Fliess Chief Software Architect Microsoft Regional Director alonf@codevalue.net http://alonfliess.me 1 Eran Stiller Cloud Division Leader Senior Software Architect erans@codevalue.net http://stiller.co.il/blog
- 2. Agenda Software Architecture Micro Services Architecture Containers & Docker Azure Container Services Demo 2
- 3. About Alon Chief Architect & Co-Founder at CodeValue More than 25 years of hands-on experience Microsoft Regional Director & Microsoft MVP Active member of Microsoft Advisory Councils Renowned speaker at both international and domestic events 3
- 4. About Eran Cloud Division Leader & Co-Founder at CodeValue Software architect, consultant and instructor Microsoft Azure MVP More than 10 years of hands-on experience Expert in large-scale, server-side, highly-concurrent systems Co-Founder of Azure Israel Meetup 4
- 5. About CodeValue & OzCode CodeValue – Inspiring Code. Creating Value. A consultancy and software development firm High quality software projects and managed services Valuable training and mentoring Advanced software technology and methodology consulting OzCode – an innovative VS debugging extension Helps identify and fix bugs during C# development Saves time and effort Makes the debugging process easy and simple
- 7. What a Modern Architect SHOULD Know 7 SRS UML Use Cases User Stories Risk Mitigations Design Redis SRP 7 Client Server Schema OOP SQL SOA NoSQL Encapsulation Data JSON ETL Reporting AWS BASE Queue XML Cloud Big Data ACID Micro Services Architecture Distributed Cache REST Idempotency BI Map Reduce NLB HTTP Indexing CDN Search Security Log HPC Authentication Docker Containers HA DRPub/Sub UI/UX CQRS MEAN ORM Push Notifications
- 8. What a Modern Architect MUST Know Understand the requirements Understand the constraints Low coupling High cohesion Balance of size & number of components Volatility Workplace politics
- 9. Software Architecture The system structure Built from software components The relationship between components The properties of both components and relations Software architecture is about making fundamental structural choices Which are costly to change once implemented Designing software architecture is a mix of art and science!
- 10. Software Architecture Goals Defining a structured solution that Meets all the technical and operational requirements Captures the non-volatile (hard to change) decisions Focuses on important elements of the system (context) Provide a solid foundation for a successful software product Answer the requirements: Functional Non-Functional (quality attributes) Constraints 10
- 11. Cohesion The degree to which a module performs one and only one function Strive for high cohesion A module can be: Library (assembly, shared module, DLL) File Class Method COM/CORBA component (Micro) Service Any reusable element 11
- 12. Coupling The degree to which each program module relies on each of the other modules Low coupling often correlates with high cohesion, and vice versa Low coupling is A sign of a well-structured computer system Good design When combined with high cohesion Supports high readability, maintainability, extendibility, and reusability Micro Service Architecture == High Cohesion & Low Coupling 12
- 13. Why Should I Care About Coupling Tightly coupled systems tend to exhibit the following developmental characteristics A change in one module usually forces a ripple (cascading) effect of changes in other modules Assembly of modules might require more effort and/or time due to the increased inter-module dependency A particular module might be harder to reuse and/or test because dependent modules must be included The DevOps process becomes a nightmare!!! 13
- 14. Fan-In Fan-Out and Stable Module One way to examine module stability (i.e. low coupling and high cohesion) is by looking at its fan-in fan-out and other dependencies Fan-In The number of users of the module Fan-Out The number of modules that the current module is being used by A stable module is a module that has high fun-in and low fan-out This module can be easily reused 14
- 15. Just The Right Number Of Modules 15 number of modules Module integration cost module development cost The cost of the software
- 16. Modern Software Project Challenges 16 We need to do more with less More functional requirements and better quality attributes (Many) more end users (Many) more servers to manage with less operators More changes with less or even no maintenance downtime
- 17. The 24/7 Challenge How do you update a system running 24/7/365? How do you keep the application servers responsive? How do you keep all application servers synced? How do you update the data/schema? How do you update all your clients’ software? Web, Mobile, Desktop… How do you rollback on error? How do you rollback data? How do you know there is an error? 17
- 18. The 24/7 Challenge Plan ahead DevOps Architect Low Coupling, High Cohesion Schema/API Versioning Use supporting platforms Cloud Containers 18
- 19. Microservices Architecture (MSA) - Wikipedia “Microservices is a specialization of and implementation approach for service-oriented architectures (SOA) used to build flexible, independently deployable software systems” “Services are small in size, messaging enabled, bounded by contexts, autonomously developed, independently deployable, decentralized and built and released with automated processes” “The benefit of distributing different responsibilities of the system into different smaller services is that it enhances the cohesion and decreases the coupling” 19
- 20. MSA Criticism The architecture introduces additional complexity such as: Network latency Message formats and versioning nightmare Load balancing and fault tolerance management Testing and deployment are more complicated 20
- 21. MSA Drawbacks Solution Plan ahead DevOps Architect Low Coupling, High Cohesion Schema/API Versioning Use supporting platforms Cloud Containers 21
- 22. 22 Modern Microservices Architecture with Docker
- 23. Docker, Docker, Docker Containers have been around for many years Docker Inc. did not invent them They created open source software to build and manage containers Docker makes containers easy Even I can create and run them Docker is a container format and a set of tools Docker CLI, Docker Engine, Docker Swarm, Docker Compose, Docker Machine and more… Docker is an eco-system 23
- 24. Server Host OS Hypervisor Server Host OS Docker Engine Guest OS Guest OS Guest OS Bins/Libs Bins/Libs Bins/Libs App A App A’ App B Bins/Libs Bins/Libs AppA AppA’ AppB AppB’ AppB AppB’ AppB AppB’ Containers are isolated, but share OS and, where appropriate, bins/libraries Bins/Libs
- 29. App1 App2
- 30. Demo Architecture 33 Web Portal RedisTwitter Reader Queue Twitter Twitter Analyzer Queue Aggregator Pub/Sub Microsoft Cognitive Services
- 31. Demo Architecture 34 RedisTwitter Reader Web Portal Load Balancer Queue Twitter Queue Aggregator Pub/Sub Microsoft Cognitive Services Twitter Analyzer
- 33. Summary Software Architecture Micro services Architecture Containers & Docker Azure Container Services Demo 39
- 34. 41
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