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Microservices Architecture Based Components Are Designed for Failure

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Microservices Architecture Based Components Are Designed for Failure Microservices HTTP://WWW.WEBAGESOLUTIONS.COM/TRAINING/MICROSERVICES/ What are Microservices? A microservices-based application is a distributed system, with each service instance running as a process Microservices must interact using an inter-process communication protocol such as HTTP or message queueing, depending on the nature of each service. A microservice or microservice composition results in a business transaction A microservice is accessed through its known API which acts as a published contract for the service consumers Microservices collaborate with each other in a decentralized fashion using built-in intelligence for request routing and embedded business logic Adoption of microservices is facilitated by the DevOps practices for containerization, CI/CD and Enterprise Application Integration © 2017 2 Demystifying Microservices HTTP://WWW.WEBAGESOLUTIONS.COM/TRAINING/MICROSERVICES/ 3 Microservices Analogy It may help to understand what microservices are by drawing an analogy with Unix command-line tools You can build quite sophisticated data processing chains by joining various Unix command-line tools through the piping ('|') mechanism For example, the following commands will count the number of lines containing the '#' character in all files with the extension .csv in the working folder: cat *.csv | grep '#' | wc -l You can think of a microservice as a stand-alone Unix tool that does a small (and useful) job and which lends itself for participating in some form of collaboration with other microservices to produce a solution to a task in a specific problem domain Solutions are created from suites of loosely coupled and cohesive microservices © 2017 4 Monolithic vs. Microservice © 2017 5 Qualities of Microservices Componentization via Services Organized around Business Capabilities Products not Projects Smart endpoints and dumb pipes Decentralized Governance Decentralized Data Management Infrastructure Automation Design for failure Evolutionary Design © 2017 6 Cloud Native Applications 7 Key Components of Successful Microservices Teams “A3 & C” Shared Accountability for service consistency Automation of cattle Architecture patterns Culture of Containerization Other keys areas include DevOps, collaboration, gold master example, and standards © 2017 8 Designing for failure Microservices architecture based components are designed for failure. Any service can fail, anytime The client application has to respond as gracefully as possible It's important to be able to detect the failures quickly and, if possible, automatically restore service Microservices applications put a lot of emphasis on real-time monitoring Netflix's Chaos Monkey induces failures of services during the working day to test the application's resilience and monitoring © 2017 9 Microservices In a Nutshell Shift Left. Microservices go hand-in-hand with Agile software development methodologies and DevOps. Competitive Advantage. Clean, well managed services improve agility and velocity. Technology Enabled Business. Time to market and value is enabled by a componentized application, built on the principal of MVP. Gold Master. Every organization needs their reference architecture and working examples to simplify consistent adoption across the enterprise. © 2017 10 Docker and Microservices Docker containers drives the adoption of microservices and vice versa. Docker puts significant emphasis on the "Unix philosophy" of shipping containers, i.e. "do one thing, and do it well". Run only one process per container. In almost all cases, you should only run a single process in a single container. Decoupling applications into multiple containers makes it much easier to scale horizontally and reuse containers. When aiming for "doing one thing" it doesn't make sense to containerize the entire, huge, enterprise application as a single Docker container. You would want to first modularize the application into loosely coupled components that communicate via standard protocols, which in essence, is what the microservices architecture delivers. Docker containers and microservices architecture enable continuous delivery. © 2017 11 Single Page Applications The SPAs are web applications that have a single web page and all views render dynamically when the user interacts with the application. SPAs use AJAX to call backend data through services and most of the work is done on the client side: © 2017 12 Spring Boot Spring Boot (http://projects.spring.io/spring-boot/) is a project within the Spring IO Platform (https://spring.io/platform) Developed in response to Spring Platform Request SPR-9888 "Improved support for 'containerized' web application architectures" Inspired by the DropWizard Java framework (http://www.dropwizard.io/) Spring Boot focuses on facilitating a fast-path creation of stand-alone web applications packaged as executable JAR files with minimum configuration. An excellent choice for creating microservices, but many options abound e.g. Go, Ruby, Node, C++, C#, or other Java frameworks © 2017 13 Data Management Considerations Microservice applications are decomposed to components – smaller independent service applications. Components are loosely coupled and that includes the backing store © 2017 14 © 2017 15 JSON Web Token (JWT) JSON Web Token (JWT) is an open standard (RFC 7519) that defines a compact and self-contained way for securely transmitting information between parties as a JSON object. This information can be verified and trusted because it is digitally signed. JWT contains the header and the payload. The first part is the token’s header which identifies the token’s type and the algorithm used to sign the token. The second part is the JWT token’s payload or its claims. There’s a distinction between these two. A payload can be an arbitrary set of data, it can be even plaintext or another (nested JWT). Claim JWT contain a standard set of fields. https://jwt.io © 2017 16 Service Fabric Application Modernization 1) Take a traditional monolithic application 2) Lift and Shift - Use containers or guest executables to host existing code in Service Fabric. 3) Modernization - New microservices added alongside existing containerized code. 4) Innovate - Break the monolithic into microservices purely based on need. 5) Transformed into microservices - the transformation of existing monolithic applications or building new greenfield applications. © 2017 17 Questions ? HTTP://WWW.WEBAGESOLUTIONS.COM/TRAINING/MICROSERVICES/.
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