What are the five core components of springcloud

The five core components of springcloud are: 1. Eureka, which implements service governance; 2. Ribbon, which provides client-side software load balancing algorithms; 3. Hystrix circuit breaker, which prevents an application from trying to perform an operation multiple times; 4. Zuul, which has multiple functions such as api gateway, routing, load balancing, etc.; 5. Config, which performs configuration management.

# Operating system for this tutorial: Windows 10 system, Dell G3 computer.

The five core components of springcloud are:

1. Eureka

Function: realize service governance (service registration and discovery).

A RESTful service used to locate middle-tier services running in AWS Regions. It consists of two components: Eureka server and Eureka client. Eureka server is used as a service registration server. The Eureka client is a Java client used to simplify interaction with servers, act as a polling load balancer, and provide failover support for services. Netflix uses a separate client in its production environment that provides weighted load balancing based on traffic, resource utilization, and error status.

When the application starts, the Eureka client registers its own service information with the server and caches the server's service information locally. The client will periodically conduct heartbeat interactions with the server to update service leases and service information.

2. Ribbon

Function: Mainly provides client-side software load balancing algorithm.

Spring Cloud Ribbon is a client-side load balancing tool based on HTTP and TCP, which is implemented based on Netflix Ribbon. Through Spring Cloud's encapsulation, we can easily automatically convert service-oriented REST template requests into client-side load-balanced service calls. The Ribbon client component provides a series of complete configuration options, such as connection timeout, retry, retry algorithm, etc. Ribbon has built-in pluggable and customizable load balancing components.

3. Hystrix

A circuit breaker prevents an application from trying to perform an operation multiple times, which is likely to fail, allowing it to continue without waiting for failure recovery or waste CPU cycles while it determines that the fault is persistent. Circuit breaker mode also enables applications to detect whether the fault has been resolved. If the problem appears to have been corrected, the application can try to invoke the operation.

In order to ensure high availability, individual services are usually deployed in clusters. Due to network reasons or its own reasons, the service cannot guarantee 100% availability. If there is a problem with a single service, thread blocking will occur when calling this service. At this time, if a large number of requests pour in, the thread resources of the Servlet container will be consumed. , causing service paralysis. Due to the dependencies between services, failures will propagate and have catastrophic consequences for the entire microservice system. This is the "avalanche" effect of service failures.

4. Zuul

Function: It has multiple functions such as api gateway, routing, load balancing and so on.

Similar to nginx, reverse proxy function, but Netflix itself has added some features to cooperate with other components. In the microservice architecture, back-end services are often not directly open to the calling end, but are routed to the corresponding service through an API gateway based on the requested URL. When an API gateway is added, a wall is created between the third-party caller and the service provider. This wall directly communicates with the caller for permission control, and then distributes requests to the backend server in a balanced manner.

5. Config

Function: configuration management.

SpringCloud Config provides server side and client side. The default implementation of the server storage backend uses git, so it easily supports a tagged version of the configuration environment, as well as providing access to a variety of tools for managing content. This is still static and needs to be coordinated with Spring Cloud Bus to achieve dynamic configuration updates.

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