I'm going to begin a new project of microservice and want know about patterns that I might wan't to implement on my new microservice for that I could scale, don't have problems with load balance, have an good service with resilience.
I looking to know about patterns that might microservices should implement
Also could you provide some indications for Java microservices application?
For solve some problems that was said: [1]
Architecture: You could build small microservices as it can be, so that the scale be right focused on need to be.
You could set a Discovery service for registering the applications instances, with that making easier to the client access the right application when are lots of instances of the same service (Netflix Eureka / Spring Cloud).
You could set a Configuration outside the code source of the code, so that all the instances can be configured without human intervention right on the running code (Spring Cloud Config).
Set a way the check the health of the microservice with ease.
I circuit breaker for clear the anomalies microservices instances (Spring Cloud / Netflix Hystrix).
and following as say the Twelve-Factor App.
With lots of another things that you need to that care when building a microservice, suggesting the reading the book, if you'll use Java for building microservices Spring Microservices in Action By John Carnell , if you i'll implement in another programming language this other could guide you, Microservices in Action by Morgan Bruce and Paulo Pereira.
[1] (https://www.amazon.com.br/Spring-Microservices-Action-John-Carnell/dp/1617293989
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I'm familiar with spring boot framework and I developed an Application which helps to handle online Assignments.I used few service classes to handle different tasks of the application and its structure can be seen here.
And I have seen several complex applications built as independent packages based on the task it do in the application.
(1)
My First question is can my Application be called as a MicroServices Application?? Because I have
used independent services for the application development.
(2)
And my second question is Can a application developed in MicroServices Architecture has MVC Architecture at the same time.But I have seen in several tutorials they are 2 different architectures.But a Moicroservices Application also has Models ,Views and Controllers at the same time.
So can those 2 be used at the same time??
Thank you!!
You should do some deeper research yourself about the concept and theory of microservices. Studying other applications without the basic knowledge can be misleading.
(1) Just because you are using multiple classes called services does not mean, you are building microservices application. Microservice application examples can be - student management rest api, question and answer management rest api, UI for administration, UI for public usage etc. All of them can be separate spring boot apps, or any other technology capable of handling the requirements (node.js, python, php, Asp.net ...) You should be able to deploy, test and use them as separate standalone apps.
(2)I think a microservice app does not need views, it can be a rest/soap app, log aggregation app, health check app, messaging service app etc. But different types can use different architecture, one of which can be MVC.
By definition of M. Fowler microservices are
..an approach to developing a single application as a suite of small services, each running in its own process and communicating with lightweight mechanisms, often an HTTP resource API.
As you see the definition is ambiguous. I think you are building a monolith application with a good separation of responsibilities into classes called XyServices - a possible candidates to migrate to microservices.
Microservices according to Chris Richardson
( recognized thought leader in microservices) is Microservices - also known as the microservice architecture - is an architectural style that structures an application as a collection of services that are
Highly maintainable and testable
Loosely coupled
Independently deployable
Organized around business capabilities
Owned by a small team
The microservice architecture enables the rapid, frequent and reliable delivery of large, complex applications. It also enables an organization to evolve its technology stack.
It is way of delivery and based on 12 factors
https://12factor.net/.
We use domain driven design as one of the way.
MVC is way of designing as service where we have model view and controller.
In Microservices architecture we can use MVC in one way where each component will be distributed .
Please go through the Microservice Patterns. It is very good book to understand the Microservices architecture
1.Answer to your question yes your application can be Microservices if it followed the 12 factors as mentioned in the website .
Yes Microservices can be on the pattern of mvc but they will be distributed and like we have Microservices for backend in similar fashion we have micro frontend for UI .
I want to create a microservice with spring boot but in fact I am not underestanding the architecture microservice well ! I create a controller, a service, a repository, a model and I have related it with a mongo database thanks to the file application.properties ! And I can access to it thanks to the path "http://localhost:8080".
My question is : This project that I have developped with spring boot is it a microservice ? Or it need the service Eurika to become a microservice ?
Interesting question - to understand the answer you need to think first "Why microservices" or "What are the benefits of microservices".
When you will google this you will get tons of benefits of microservices architecture (of course there are some drawbacks as well).
But focusing on benefits one of the most common benefits you will see is microservices architecture is scalable.
Now the answer to your questions lies in this benefit 'Scalable'.
In very simple words, scalability of microservices means horizontal scalability of the microservices. That essentially means you need to run multiple instances of your microservices so that you can cater more and more load/traffic on your system.
Now the moment you run multiple instances there has to be some support component in your architecture that helps you in service discovery.
And Eureka is one of the ways you do service discovery in the microservices services architecture.
Now the short answer to your question - No! Eureka is not necessary microservices architecture but service discovery is one of the foundation pattern in the microservices architecture. (and Eureka is one of the tool/ways of achieving the same)
We are developing our application which probably is going to consist of about 20 Microservices. We are considering to use Pivotal Cloud Foundry to manage our Microservices and make it easier to have a platform for deployment and health check - amoung others.
About 12 Microservice will render HTML and now we want to know how we can compose all these services to one UI and present it to the client. Does Cloud Foundry a plugin or somehow solves the UI issues for Microservices? Does PCF generates Composite UI?
Does Cloud Foundry a plugin or somehow solves the UI issues for Microservices? Does PCF generates Composite UI?
No, the platform does not do this for you. It only handles routing requests to your apps.
About 12 Microservice will render HTML and now we want to know how we can compose all these services to one UI and present it to the client.
You might look into using a proxy app in front of your microservices. The proxy would just be responsible for presenting a unified front for your clients and combining all the backend services together.
Netflix Zuul/Spring Cloud Zuul or Spring Cloud Gateway might help with this, if you're using Java. I've also see people use Nginx as a reverse proxy to do similar things.
At the end of the day, you're going to need to figure out what works for your particular microservices & clients side apps though. I don't think anyone can give you a definitive answer to your question, at least not without a lot more information.
I'm a newbie on Spring Cloud, and I'm a little confused about it. Kubernetes and Spring Cloud are both micro-services framework. If I have Kubernetes(or mesos) already, why do I need use Spring Cloud? I notice that many projects use them both.
What's the difference between Kubernetes and Spring Cloud? They both can provide service discovery, load balance and so on.
I'm really confused.
Kubernetes and Spring Cloud address a lot of the same concerns with Microservices, but with different approaches and technologies. Redhat wrote a great article explaining this. Here the main takeaways:
Spring Cloud has a rich set of well integrated Java libraries to
address all runtime concerns as part of the application stack. As a
result, the Microservices themselves have libraries and runtime agents
to do client side service discovery, load balancing, configuration
update, metrics tracking, etc. Patterns such as singleton clustered
services, batch jobs are managed in the JVM too.
Kubernetes is
polyglot, doesn’t target only the Java platform, and addresses the
distributed computing challenges in a generic for all languages way.
It provides services for configuration management, service discovery,
load balancing, tracing, metrics, singletons, scheduled jobs on the
platform level, outside of the application stack. The application
doesn’t need any library or agents for client side logic and it can be
written in any language.
In some areas both platforms rely on similar
third party tools. For example the ELK and EFK stacks, tracing
libraries, etc.
Some libraries such as Hystrix, Spring Boot are useful
equally well on both environments. There are areas where both
platforms are complementary and can be combined together to create a
more powerful solution (KubeFlix and Spring Cloud Kubernetes are such
examples).
Source: https://developers.redhat.com/blog/2016/12/09/spring-cloud-for-microservices-compared-to-kubernetes/
To understand the differences and similarities in more detail I would recommend to the read the full article.
I'm looking for open source applications that demonstrate the microservices pattern. In particular, I'd like to find one or more applications that can be spun up on real cloud environment up (but with fake data and requests) to demonstrate real-world deployment mechanics.
Unfortunately, I haven't found any good options yet. I'll note that Discourse is a modern 3-tier application, using Rails API, Ember.js, Postgres, and Redis, but it still is much closer to a monolith than an example of microservices. The closest I've found so far is https://github.com/kbastani/spring-cloud-microservice-example but that is more of a framework than an actual application that delivers data.
Not your typical CRUD app but Deis (a PaaS) uses REST APIs mostly to communicate between services. Peatio has a bunch of services that communicate asynchronously through a message queue.
Microsoft provides a demo webshop application based on .NET Core showing how to apply the microservices pattern:
https://github.com/dotnet-architecture/eShopOnContainers
There is also an ebook available: https://aka.ms/microservicesebook
this lagom application example is a microservices application written in Lagom . It is a akka based framework (DDD for design).
Application is complete and working. See if that serve your purpose.