Microservices

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Below I'm sharing my learning regarding Technical Concept (Microservices). Have a glance on this and enjoy your reading. Hope you all might get benefited from it!

Q. What is Microservice?

Microservice?is a Service Oriented Architecture. In the microservice architecture, there are a large number of?microservices. By combining all the microservices, it constructs a big service. In the microservice architecture, all the services communicate with each other.

Some Key Points of Microservice-

• Not a framework or API
• It is a design pattern to develop applications
• Using Microservices we can develop application with loosely coupling
• Instead of developing all functionalities in single application we will divide them into multiple services (microservices)

Q. What are advantages with microservices-

• Rapid development
• We can use multiple programming languages (Independent technologies)
• Fast Development
• Quick Releases
• Easily deployable, manageable and maintainable

Q. What are the Challenges with Microservices

• Bounded context(Deciding how many microservices we need to develop in a project ?)
• Duplicate Configuration (In every microservices me we need to write some common configurations)
• Visibility (All team members will not get the chance to work with all microservices)
• Pack of cards (If main microservice failed then rest of the services will become useless)

Q. What is the architecture for Microservices ?

• There is no fixed architecture for microservices
• Companies/ people are customizing Microservices architecture as per their project requirement.

Basic Architecture of Microservice

Note: They are optional as per the requirement it can change . It is generalized architecture.

Q. What are the components used in Microservice ?

• Netflix Eureka Naming Server (Service Registry)
• ?Admin Server
• Zipkin Distributed Tracing Server
• ?AIPs/ Services
• Netflix Ribbon (FeiginClient)
• Netflix Gateway Server

Q. What is Service Registry (Eureka) ?

• use to register all the services/ rest api's available in project
• It will? provide all services details like name, status ,url etc..
• It provides a user interface to monitor all the details.

Note- @ EnableDiscoveryClient – use to make sure our application will search for Eureka server and register with Eureka server.

?Q. What is Admin Server ?

• ?It is use to monitor and manage all the services at one place
• ?It provides user interface to monitor and manage our apis

?(Actuators endpoints, LOG level changes without restarting server etc..)

?

Q. What is Zipkin Server?

• ?It is used for distributing log tracking
• ?We can find which rest api/ service taking more time to process a request
• ?It provides a user interface to monitor services/ rest apis execution details.

?

Q. What are AIPs/ Services?

• APIs contains actual business logic of our applications
• APIs means our RESTFul services (REST APIs)
• Every API is called as one? Microservice
• Every API is responsible to perform one action /operation

?Ex: Payment api, report api, admin api, dashboard api, search api etc…

?

?Q. What is? FeiginClient ?

• FeiginClient is used to implement Interservice Communication
• Communication between 2 microservices with in same project is called interservice communication.

Q. What is ?API Gateway ?

• ? It will act as front gate for backend apis
• ??Acts as mediator between end user? requests and backend apis
• ??We will write filters + Routers here
• ??Using filter we can validate the request(security)
• ? Routers are used to forward the request specific backend api.

Q. What is load Balancing?

Is the process of distributing load to multiple server

Application without Load Balancer:-

• if we deploy our application in single server than that server is responsible to handle all the requests
• if too many requests comes at a time then burden will increase on server ,If burden increases

-?server may not handle?

? -?requests processing will take more time.

-?users need to wait for the response

-?server might crash

- we will lose customers And business.

??To overcome all above problems we will use load balancer

Application with load balancer-

??Instead of running applications on a single server , We will run our application on multiple servers.

• Application will be deployed into multiple servers
• End users request will be received by load Balancer
• LBR will? distribute the load to servers in Round Robbin Fashion?

????Round Robbin Fashion-? one faster other…

?????????????????????????????????????????1st request go to 1st server

?????????????????????????????????????????2nd request go to 2nd server

?????????????????????????????????????????3rd request go to 3rd server

????????????????????????????????????????4th request go to 1st server and so on….

• If any one server got crashed still requests will be handled by other server which are up and running
• In all servers same application will be deployed

Conclusion:-

In the above article we have discuss some of the basic introduction of Microservice and its architecture.

Thankyou For Reading!

Published by:?Sakshi Agrawal

Date?:?March 30,2023