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All About Microservices and OpenSource Microservice Frameworks

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This slide deck explains why we need microservices and how we can develop microservices using opensource microservice frameworks.

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All About Microservices and OpenSource Microservice Frameworks

  1. 1. OSI MicroServices Workshop
  2. 2. Microservices??????????
  3. 3. What are microservices? Microservice is a software development technique that structures an application as a collection of loosely coupled services. ● Each Services : ○ is relatively small, easier to understand and loose coupling. ○ serves a single purpose and can be developed independently by different teams. ○ can be deployed and scaled independently. ● Decomposition of Applications. ● Highly Observable
  4. 4. Why do we need Microservices?
  5. 5. Challenges for microservices
  6. 6. MicroService Frameworks Service-Mesh SDK’s ● Istio ● Linkerd ● Mesher ● Conduit ● SpringCloud ● Alibaba Dubbo ● ServiceComb ● Go-Kit
  7. 7. How to select the microservices framework
  8. 8. Istio & Linkerd
  9. 9. Service Mesh ● Why service mesh is required for microservice architecture. ● Service Mesh ○ A service mesh is a dedicated infrastructure layer for handling service-to-service communication. ● How service mesh works ● Sidecar ● Service mesh features. ○ Routing ○ Load Balancing ○ Fault Injection ○ Circuit Breaker ○ Service Discovery ○ Rate Limiting ○ Transparent mutual TLS ○ Metrics, Tracing ● Benefits of service mesh ● Examples of service mesh. ○ Istio ○ Linkerd service mesh
  10. 10. Sidecar ★ Sidecar is a way to run alongside your service as a second process. The role of the sidecar is to augment and improve the application container, often without the application container’s knowledge. ★ sidecar is a pattern of “Single-node, multi container application”. ★ This pattern is particularly useful when using kubernetes as container orchestration platform. Kubernetes uses pods. A pod is composed of one or more application containers. A sidecar is a utility container in the pod and its purpose is to support the main container. It is important to note that standalone sidecar does not serve any purpose, it must be paired with one or more main containers. Generally, sidecar container is reusable and can be paired with numerous type of main containers.
  11. 11. Istio Overview Istio is a kind of service mesh which supports all the features which has been explained in service mesh without changing the actual service code and this will be deployed along side with the service. Architecture ❖ The data plane is composed of a set of intelligent proxies (Envoy) deployed as sidecars. ❖ These proxies mediate and control all network communication between microservices along with Mixer, a general-purpose policy and telemetry hub. ❖ The control plane manages and configures the proxies to route traffic. Additionally, the control plane configures Mixers to enforce policies and collect telemetry. Supported Platform
  12. 12. Linkerd Overview Linkerd is a service mesh and it makes running your service easier and safer by giving you runtime debugging, observability and security without changing your code. Architecture Basic components of linkerd are ❖ UI(Command line and web based) ❖ Data Plane ❖ Control Plane Supported Platform
  13. 13. Example of service mesh as a sidecar
  14. 14. Alibaba Dubbo
  15. 15. Alibaba Dubbo Dubbo is a high-performance, light weight, java based RPC framework. Dubbo offers three key functionalities, which include interface based remote call, fault tolerance & load balancing, and automatic service registration & discovery.
  16. 16. Dubbo: Features ● Transparent interface based RPC ● Intelligent load balancing ● Automatic service registration and discovery ● High extensibility ● Runtime traffic routing ● Visualized service governance
  17. 17. Implementation of sample code dubbo-demo-api: the common service api package org.apache.dubbo.demo; public interface DemoService { String sayHello(String name); } dubbo-demo-provider: the demo provider codes package org.apache.dubbo.demo.provider; import org.apache.dubbo.demo.DemoService; public class DemoServiceImpl implements DemoService { public String sayHello(String name) { return "Hello " + name; } } Consumer.java [3] : import org.springframework.context.support.ClassPathXmlApplicationContext; import org.apache.dubbo.demo.DemoService; public class Consumer { public static void main(String[] args) throws Exception { ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext(new String[] {"META-INF/spring/dubbo-demo-consumer.xml"}); context.start(); // Obtaining a remote service proxy DemoService demoService = (DemoService)context.getBean("demoService"); // Executing remote methods dubbo-demo-Consumer: the demo Consumer codes
  18. 18. ServiceComb
  19. 19. ServiceComb ServiceComb is a microservice framework with full functionality of service management, focus on rapid development of microservices.
  20. 20. Service Discovery
  21. 21. Service-Center ● Restful based Service-Registry. ● Service discovery and Management. ● Event driven data management, notify-subscription. ● Fault Tolerance and Resilient. ● Stateless service and scalable by design. ● High performance cache design. ● Out of box support for metrics and tracing. ● Web Portal to manage the microservices.
  22. 22. Service-Center Entity Management Project Tenant Env App Service Meta-Data Instances Rules Dependency Schemas Tags CACHE ETCD Auth Event Notifier Quota Plugins Governance Dependency Service-Center Management
  23. 23. Restful Open API Format ● All the functionalities of Service-Center are API Driven and is properly documented. ● Anyone can use these api’s to develop their own SDK.
  24. 24. Service Registration Service-Center Consumer/Client Provider/Server Registers the information of self services and instance to Service-Center /register Sends the HeartBeat at regular interval to Service-Center updating the status of the Service /heartbeat "services": [ { "serviceId": "4c0b4ab68a7011e8a5b50242ac110002", "appId": "default", "serviceName": "Consumer", "instance": [ "endpoints" :["rest://192.168.42.252:9999"]: ] }, { "serviceId": "466927088a7011e8a5b50242ac110002", "appId": "default", "serviceName": "Provider", "instance": [“endpoints" :["rest://192.168.42.252:9999"]: ] } ]
  25. 25. Service Discovery Service-Center Consumer/Client Provider/Server FindMicroService(“Provider”) Get Provider Details CACHE Watches for any change in the content of Cache "services": [ { "serviceId": "466927088a7011e8a5b50242ac110002", "appId": "default", "serviceName": "Provider", "instance": [“endpoints" :["rest://192.168.42.252:9999"]: ] } ] Communicates to provider using the endpoints given by SC
  26. 26. High Performance Cache Design and Scalable ● Stateless service, all the state is saved in etcd. ● Provision clusters on any infrastructure. ● Cache is maintained to store all the snapshot of the services and listen to any data change event. ● Provides api to do self-discovery of all the instances of Service-Center in the env.
  27. 27. Metrics and Tracing ● Support metrics in Prometheus format and Grafana. ● Exposes tracing information to Zipkin.
  28. 28. Security ● Different entity management for dynamic and static data and data can be isolated on all levels. ● It provides Rules for Service Discovery using BlackList and WhiteList. ● It has support for authentication of API’s by IAM
  29. 29. Web Portal
  30. 30. Setup Service-Center & Monitoring
  31. 31. Setup Service-Center & Monitoring GitHub Link: https://github.com/apache/incubator-servicecomb-service-center Release Link: http://servicecomb.apache.org/release/ Docker Hub: https://hub.docker.com/r/servicecomb/service-center/ Bring up service-center and other monitoring apps using docker compose file.
  32. 32. Go-Chassis
  33. 33. Go-Chassis Microservice framework for Go Developer for developing distributed Go Application. Supports complete set of functionality like route management, circuit breaker, load balancing, monitoring, tracing etc Go-chassis is flexible Support istio platform
  34. 34. Go-Chassis
  35. 35. Go-Chassis ● Pluggable registrator and discovery service ● Pluggable protocol ● Circuit Breaker ● Route Management ● Loading Balancing ● Rate Limiting ● Dynamic Configuration Framework ● Metric, Logging and Tracing ● Handler chain
  36. 36. Go-Chassis : Load Balancing Random Round Robin Weighted Response Session Stickiness
  37. 37. Go-Chassis: Rate Limiting Limit the request frequency of the provider or consumer 1. Provider side can limit the frequency of receiving processing requests 2. Consumer side can limit the frequency of requests sent to the specified micro service
  38. 38. Mesher
  39. 39. Mesher Overview ★ Mesher is a service mesh implementation based on go chassis. ★ It is a proxy to connect, manage and secure microservices. ★ Mesher provides an easy way to create a network of deployed services with load balancing, service-to-service authentication, monitoring, circuit-breaker, rate limit etc.. without any changes in the service code. ★ Add mesher service by deploying a special sidecar proxy throughout your environment that intercepts all network communication between microservice. Deployment of mesher ❖ Manual sidecar injector ❖ Automatic sidecar injector Way of calling to a service which uses mesher as a service mesh curl http://service_name:port curl http://service_name Supported platform
  40. 40. Manual Sidecar Injector ★ In manual sidecar injector user has to provide the information of service mesh while writing the deployment file for service. Automatic Sidecar Injector ❖ In Automatic sidecar injector user has no worry to take care of adding service mesh information framework itself will do the work.
  41. 41. Traffic Management Circuit Breaker
  42. 42. Java-Chassis & Saga
  43. 43. Java Chassis Apache ServiceComb (incubating) Java Chassis is a Software Development Kit (SDK) for rapid development of microservices in Java, providing service registration, service discovery, dynamic routing, and service management features
  44. 44. Java Chassis: Sample service definition file A service definition identifies a microservice. It defines the service name, version, and the application that the service belongs to. The service definition can also contain extended information defining the attribute metadata of a service. This service should be present each and every microservice. APPLICATION_ID: helloTest #Application name service_description: #Service description name: helloServer #Microservice name version: 0.0.1 #Service version properties: #Metadata allowCrossApp: false service_description: name: jaxrs version: 0.0.2 servicecomb: service: registry: address: http://127.0.0.1:30100 rest: address: 0.0.0.0:8080 highway: address: 0.0.0.0:7070 handler: chain: Provider: default: bizkeeper-provider Consumer: default: bizkeeper-consumer,loadbalance
  45. 45. Java Chassis: Invocation flow
  46. 46. Saga: Data consistency framework Data consistency is a critical aspect of many systems, especially in cloud and microservice environment. Apache ServiceComb (incubating) Saga is an eventually data consistency solution for micro-service applications. Architecture Saga Pack is composed of alpha and omega. ● The alpha plays as the coordinator. It is responsible for the management of transactions. ● The omega plays as an agent inside the micro-service. It intercepts incoming/outgoing requests and reports transaction events to alpha.
  47. 47. Saga: Use case This demo shows you how to use the Saga solution provided by ServiceComb to ensure the microservice for data consistency. With microservice architecture, each of the services may have its own database technology and it’s not feasible to ensure all transactions on these services are either committed or rolled back with database. In this demo, we make use of Saga to ensure eventual data consistency among services, the payment is only executed after car rental, flight booking, and hotel-reservation are complete.
  48. 48. Development & Deployment Mode in ServiceComb
  49. 49. Deployment & Deployment Mode in ServiceComb Development ● ServiceMesh ● SDK Deployment: ● Bare Metal ● Docker Containers ● Kubernetes
  50. 50. Transform Monolith Applications to Micro-Services
  51. 51. Monolith to Microservices
  52. 52. Demo App Architecture
  53. 53. Develop Java-Chassis App
  54. 54. Java Chassis: Sample application preparation flow Step 1 Import dependencies into your maven project: Step 2 Implement the services. Spring MVC is used to describe the development of service code. The implementation of the Hello service is as follow: @RestSchema(schemaId = "springmvcHello") public class SpringmvcHelloImpl { @RequestMapping(path = "/sayhello", method = RequestMethod.POST) public String sayHello(@RequestBody Person person) {   return "Hello person " + person.getName();  } Step 3 Add service definition file: Add microservice.yaml file into resources folder of your project. Step 4 Add Main class: import org.apache.servicecomb.foundation.common.utils.BeanUtils; import org.apache.servicecomb.foundation.common.utils.Log4jUtils; public class Application { public static void main(String[] args) throws Exception { //initializing log, loading bean(including its parameters), and registering service, more detail can be found here : http://servicecomb.incubator.apache.org/users/application-boot-process/ Log4jUtils.init(); BeanUtils.init();
  55. 55. Java Chassis: Sample application Microservice.yaml Pom.xml (dependency) API implementation & Application start
  56. 56. Develop Go-Chassis App
  57. 57. Develop Go-Chassis App - Catalog
  58. 58. Integrate Frontend App with Mesher
  59. 59. Integrate Frontend App with Mesher Step 1 Write a simple HTML body to display items and its price with a checkbox Step 2 Trigger a GET request to catalog service to get items and it’s price. Then process those input and display using HTML Code block written above.
  60. 60. Integrate Frontend App with Mesher Step 3 Then trigger a GET request to payment service with total price of selected items and print the response.
  61. 61. T A K
  62. 62. How to select the microservices framework????

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