What is Spring Cloud?
Spring Cloud provides a lot of tools to quickly build an application. If the developer working on a distributed application environment and need to develop a complex system as well have different reusable microservice and components it the application, spring cloud services will help to the developers in those situations.
Introduction to Distributed Environments – Spring Cloud
A distributed system is a network which consists of autonomous computers that are connected using a distribution middleware. They help in distributing different resources and potentials to provide customers with a single and integrated coherent network.
Advantages of Distributed Systems
- Local autonomy
- Improved reliability and availability
- Potential cost reduction
- Improved performance
Disadvantages of Distributed Systems
- Security problems and failures can happen
- Multiple points of failure
- Network reliance
Different components of the Spring Cloud
- Service-to-service calls
- Distributed configuration
- Service registration and discovery
- Load balancing
- Distributed messaging
- Leadership election and cluster state
- Circuit Breakers
- Global locks
Configuration – Spring Cloud
Developers need to remove all the configuration out of the application to a centralized store across all environments. Spring cloud config is able to use SVN, Git, filesystem, and Vault to store config. Most importantly config microservice applications retrieve the configuration from the server on startup and can be notified of changes and process changes in a refresh event.
Service discovery will help micro-services to easily find out the routes to the services it needs to use. For instance, Netflix Eureka service discovery is a popular service discovery. In Eureka Service discovery each service has unique serviced and service uses Eureka Client to interact with Eureka Server.
Routing and Messaging
Spring Cloud supports communications via HTTP request or message. However, these routing can be performed by using Netflix Ribbon and Open Feign open source projects. If the developer needs to perform asynchronous messaging, RabbitMQ or Kafka can be used.
API Gateway allows to Cloud Native application to route internal or external API request to the correct service
Eg: Netflix Zuul
An embedded Zuul proxy has been created by Spring Cloud to ease the development of a very common use case where a UI application wants to proxy calls to one or more back end services. This feature is useful for a user interface to proxy to the backend services it requires, avoiding the need to manage CORS and authentication concerns independently for all the backends.
This is a very useful feature in Spring Cloud, Circuit bakers help you to protect your microservices from any type of failure that might be happened. For instance, Netflix Hystrix can be used to implement Circuit Breakers.
Tracing is very useful with different microservices to communicate with each other. In addition, you can do Tracing using Spring Cloud Sleuth and Zipkin projects.
CI Pipelines and Testing
Spring Cloud Pipelines is an opinionated pipeline for Jekins or Concourse that will automatically create pipelines for Cloud Native applications. CI Pipelines and Testing is useful in building, testing and deploying the various services in Cloud Native application.
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