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Microservices, Docker deploy and Microservices source code in C#
- 1. MICROSERVICES ARCHITECTURE PRESENTED BY: K P VERMA
- 2. INTRODUCTION • Microservices is a architecture in which a large application is split up into a set of smaller services. • Each service runs in its own process and communicates with other processes by using protocols like HTTP/HTTPS, WebSocket, or Advanced Message Queuing Protocol (AMQP). • Each microservice implements a specific, end-to-end domain or business capability within a certain context boundary. • Each microservice must be developed autonomously and must be independently deployable. Finally, each microservice should own its related domain data model and domain logic. • Microservices can be based on different data storage technologies (SQL, NoSQL) and different programming languages.
- 3. CHARACTERISTICS OF MICROSERVICES • They're small, independent, scalable independently and loosely coupled. • Each microservice has a separate code base that a small development team can manage. • They're deployed independently. A team can update an existing microservice without rebuilding and redeploying the entire application. • They persist their data or the external state in their respective databases. Unlike in a monolithic architecture, microservices don't share databases. • They communicate with each other by using well-defined APIs. Internal implementation details of each service are hidden from other services. • They support polyglot programming. For example, the microservices that make up a web application don't need to share the same technology stack, libraries, or frameworks.
- 4. MONOLITHIC ARCHITECTURE • A monolithic architecture is a traditional model of a software program, which is built as a unified unit that is self-contained and independent from other applications. • Monolithic Architectures serve as a Large-Scale system, this can make things difficult. They can be cumbersome to work on when it comes to adding new features, implementing changes to existing functionality, or even removing some unnecessary functionality. • This architecture is good option for the given below: • Small scale applications • There's no need to upgrade technology • They take less time to hit the market • Teams are familiar with Monolithic approaches
- 6. MICROSERVICES ARCHITECTURE • Microservices architecture is not a good fit for Small-Scale applications that require a single technology stack, deployment platform, domain area, etc. • For a large-scale application, there's almost nothing better than this architecture thus far. • Microservices architectures is good for: • Large-scale applications • Required updates of technology • Different teams with different technical skills (programming languages, frameworks, etc.) • If you have various domains to tackle • Individual database connectivity
- 9. MICROSERVICES WORKING PROCESS • Identity Provider : Manages the identity information and provides authentication services within a distributed network. • CDN : A content delivery network to serve static resources for e.g. pages and web content in a distributed network. • Static Content : The static resources like pages and web content. • API Gateway : Serves as client’s entry point. Single point of contact from the client which in turn returns responses from underlying microservices and sometimes an aggregated response from multiple underlying microservices. • Management : This component is responsible for placing services on nodes, identifying failures, rebalancing services across nodes, and so forth. Typically this component is an off- the-shelf technology such as Kubernetes, rather than something custom built. • Service Discovery : Keeps track of services and service addresses and endpoints.
- 10. MICROSERVICES VS MONOLITHIC Aspect Monolithic Architecture Microservices Architecture Architecture Single-tier architecture Multi-tier architecture Size Large, all components tightly coupled Small, loosely coupled components Deployment Deployed as a single unit Individual services can be deployed independently DB Connection Single Database connection for all services Individual DB for each services Flexibility Less flexible as all components are tightly coupled More flexible as components can be developed, deployed, and scaled independently Communication Communication between components is faster Communication may be slower due to network calls
- 11. MICROSERVICES VS MONOLITHIC Aspect Monolithic Architecture Microservices Architecture Scalability Horizontal scaling can be challenging Easier to scale horizontally Technology Limited technology choices Freedom to choose the best technology for each service Fault Tolerance Entire application may fail if a part fails Individual services can fail without affecting others Real Example Shopify Netflix
- 12. DOCKER
- 13. DOCKER • Docker is an open-source-platform that can use to automate the deployment of applications as portable, self-sufficient containers that can run in the cloud or on-premises. • Docker is also the company that promotes and evolves this technology. Docker as an organization works in collaboration with cloud, Linux, and Windows vendors, including Microsoft. • Docker generally provides a container environment, in which any application can be hosted. Docker Image • An image is a static representation of the app or service and its configuration and dependencies. • The image, when it runs, becomes the container. The container is the in-memory instance of an image. • A container image is immutable. After you build an image, the image can't be changed.
- 14. DOCKER • Because you can't change an image, if you need to make changes to the app or service and its dependencies, create a new image. • This feature guarantees that the image you use in production is the same image that's used in development and testing. Dockerfile • A Dockerfile is a text file that contains instructions for how to build a Docker image. • Dockerfiles are written in a minimal scripting language that's designed for building and configuring images. • Dockerfiles also document the operations that are required to build an image, starting with a base image.
- 15. ORCHESTRATOR • An orchestrator is an application management tool that helps you manage, scale, and maintain a containerized application. • Orchestrator tracks and logs everything every robot does, along with everything people do with robots, so you can keep compliant and secure. • Since, each microservice owns its model and data. The microservice is autonomous from a development and deployment point of view. These kinds of systems are complex to scale out and manage. Therefore, to have a production-ready and scalable multi-container application, you absolutely need an orchestrator.
- 17. MONOLITHIC, SOA & MICROSERVICES • Monolithic Architecture: It is "like a big container" where all the software components of an application are bundled together tightly. It is usually built as one large system and is one code-base. • SOA (Service-Oriented Architecture): It is a group of services interacting or communicating with each other. Depending on the nature of the communication, it can be simple data exchange or it could involve several services coordinating some activity. • Microservice Architecture: It involves structuring an application in the form of a cluster of small, autonomous services modeled around a business domain. The functional modules can be deployed independently, are scalable, are aimed at achieving specific business goals, and communicate with each other over standard protocols.
- 18. COUPLING & COHESION • Coupling refers to the degree of interdependence between software modules. High coupling means that modules are closely connected and changes in one module may affect other modules. Low coupling means that modules are independent, and changes in one module have little impact on other modules. • Cohesion refers to the degree to which elements within a module work together to fulfill a single, well-defined purpose. High cohesion means that elements are closely related and focused on a single purpose, while low cohesion means that elements are loosely related and serve multiple purposes. • Both coupling and cohesion are important factors in determining the maintainability, scalability, and reliability of a software system. High coupling and low cohesion can make a system difficult to change and test, while low coupling and high cohesion make a system easier to maintain and improve.
- 19. VM VS DOCKER • VMs • Virtual machines (VMs) provide virtualization of an entire machine (server). • A virtual machine emulates the hardware components of a physical machine, such as the CPU, memory, network interface card, USB controllers, and sound cards. • You can run a guest operating system and multiple applications in the virtual environment. • Docker • Docker lets you run an application on any operating system. It uses isolated user-space instances known as containers. • Docker containers have their own file system, dependency structure, processes, and network capabilities. • The application has everything it requires inside the container and can run anywhere. Docker container technology uses the underlying host operating system kernel resources directly.
- 20. THANK YOU FOR THE ATTENTION 😊 HAPPY CODING !!! Sample Source Code for Microservices