Microservices Is Inseparable From the Service Mesh

Microservices introduction

The software industry has come a long way, and software architecture has evolved a lot along the way. Having gone through tier 1 (single node), tier 2 (client/server), tier 3, and distributed, we've seen some different software architecture patterns along the way.

The software industry has come a long way, and software architecture has evolved a lot along the way. Having gone through tier 1 (single node), tier 2 (client/server), tier 3, and distributed, we've seen some different software architecture patterns along the way.

Microservices.Challenges with Microservices

companies are transitioning from Monolithic to Microservices, and Microservices are gradually taking over the software industry. While monolithic architecture has many benefits, it also has many disadvantages when it comes to meeting the needs of modern software development.
Microservices architecture enables us to deploy applications more frequently and independently and reliably meet modern software application development requirements.
Microservices architecture solves almost all the shortcomings of monolithic architecture. Microservices provide fault isolation, meet smaller and faster deployment of applications, and have the scalability of applications, enabling different services to use different development technologies, improving development efficiency and meeting business-centric needs.

Microservices.Although the microservices architecture has many advantages over other architectures, it also faces a set of challenges. In a microservices architecture, it has to deal with the problems encountered when designing distributed systems.

Microservices.microservices architecture is that instead of having one large single codebase, we will have multiple independent sets of smaller services, each providing separate business functionality. With this approach, modern software applications will require dozens, if not hundreds, of individual services to work together.

Microservices.With a microservices architecture, network dependencies are introduced and reliability issues arise. Network reliability, latency, bandwidth, and network security, are some of the network-related challenges we have to deal with.

Microservices.Achieving communication between services will also be a difficult task. As the number of services increases, we have to deal with the interactions between them. In addition to communication between services, we must also handle monitoring of overall system health, fault tolerance, logging and telemetry capabilities, handling multiple points of failure, and more. With a microservices architecture, debugging problems can be trickier as we have to deal with a lot of inter-service communication and underlying networking.

With the introduction of third-party based libraries and components to overcome the above challenges associated with microservices architecture, each service also has these common capabilities (monitoring, health checks, logging, telemetry, etc.), making the service Communication to the service is smooth and reliable. However, integrating these functions into each service requires a lot of effort in development and maintenance.

Developers use third-party libraries and components (e.g. Eureka, Ribbon, Hystrix ) to provide these common functions such as service discovery, load balancing, circuit breakers, logging and metrics, telemetry, etc.

However, using third-party libraries and components presents a different set of challenges, such as:
•Tightly Coupled - The coding and configuration of these 3rd party libraries /components is tightly coupled with the business functionality in the service. Now, the application code is a mix of business functionality and configuration of these other libraries/components.
•Increased coding/configuration complexity - 3rd party libraries /components used, may have to use a different set of programming and configuration languages
•Poor maintainability - whenever these external libraries/components are upgraded, we have to update the application code, validate it and deploy those changes
•Increased debugging/troubleshooting complexity - now services are a mix of 3rd party libraries /components and if there is an application failure, developers have to spend a lot of time understanding the code and troubleshooting the problem

Although the microservices architecture provides many benefits, developers also face many difficulties in facing the above challenges. These challenges have prompted developers to find a better alternative - Service Mesh.

Microservices.Solutions for Microservices

A service mesh can be defined as a dedicated infrastructure layer that handles communication between services in a microservices architecture, reducing the complexity of the challenges described above. Service Mesh enables us to successfully and efficiently run a distributed microservices architecture and provides a unified approach to securing, connecting and monitoring microservices .
The idea behind a service mesh is pretty simple. Don't add other infrastructure/network related details to the service code, and let it focus only on the business functions it has to perform.
Typically, a service mesh provides the following capabilities:
•load balancing
•service discovery
•health examination
•verification method
•Traffic Management and Routing
•Circuit breakers and failover
•safety management
•Metrics collection and monitoring
•fault injection

With Service Mesh, we can provide common network related functions such as configuration, routing, telemetry, logging, circuit breaking, etc. in each microservice without having to use any 3rd party libraries /components . Service Mesh will abstract/externalize those common functionalities related to networking into a separate component/layer called a "Service Proxy".

A service mesh decouples the complexities of using third-party libraries /components in an application.
Developers can now make their lives a lot easier by easily troubleshooting the root cause of any issue based on application or network related issues. With the Service Mesh architecture, there is a clear division of responsibilities between business functions and network-related functions.

Typically, the Sidecar pattern is used to implement a service mesh architecture. In this mode, we can deploy a service mesh proxy next to the service. Sidecars for service proxies abstract the complexity from the application and handle features like service discovery, traffic management, load balancing, circuit breakers, and more.

In summary, with microservices based on a service mesh architecture, developers:
•No need to worry about using any 3rd party library /component to provide network related functionality
•All service-to-service communication will go through a component/layer called a "service proxy", so we don't have to implement it in every service
•business functions from network -related functions
•Focus only on business functions, not the underlying network-related functions, and let the service mesh handle it for you
•is no need to worry about the development of a service mesh because the service mesh is based on open standards such as HTTP, TCP, RPC, gRPC , etc.

Microservicesin conclusion

Microservices architecture is actively controlling the software engineering industry due to its advantages over other architectural patterns. As more and more organizations transition from monolithic to microservices architecture, as developers, we need to understand the challenges in microservices architecture and find solutions. The Service Mesh architecture addresses some of the challenges encountered in the introduction of the microservice architecture.

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