I have a file repository, like an AWS S3, but it's actually on an internal server and it is not a AWS S3 (it is a CMIS via HTTP). I have to specify that this CMIS repository is not a project as such (Java, NET, Python etc ...) it can be a midlware that lives on any server (And it cannot be modified), my doubt is, there is a probability that can discovery with EUREKA? I mean that to eureka I pass the URL-PORT and thus use its service id and not url and port from an internal Java microservice?
Thanks!!
Related
We have load balancing, discovery, etc in the Spring cloud. But the same load balancing, discovery is available in Kubernetes as well. So just wanted to know when we should go with Spring cloud (load balancing or discovery) and when to use Kubernetes
It depends on your use-case. There can be situations where you need to directly use Eureka server registry and Eureka client discovery offered by Spring Cloud Netflix. Ribbon is the client side load balancer provided by Spring Cloud Netflix.
In my experience, it is not impossible to use Eureka in any environment. It can be your local data centre or cloud infrastructure. However when it comes to deployment environment, there are so many alternatives for us to achieve the server registry mechanism. Sometimes those alternatives are the best solutions. I will give you an example below...
If you host your application in your local server (Local data centre)
Now in this scenario you can use Eureka and continue your server registry and discovery mechanism. (That is not the only way. I mentioned Eureka for this scenario because it would be a good use case for it)
If you host your application in AWS infrastructure
The AWS environment gives you lots of benefits and services such that you can forget the burden of maintaining and implementing Eureka. You can achieve simply the same behaviour by AWS load balancers, AWS target groups and even more by adding AWS auto scaling groups. In AWS it self there are so many other ways to achieve this as well.
Long story in short that for your scenario, you can continue using the power of Kubernetes and get the privilege unless you have a specific reason to use Eureka and put a large effort to implement it. You should select what suits the best depending on time, effort, maintainability, performance etc.
Hope this helps for you to get an idea. Happy coding!
I am learning building microservices using spring boot, Spring Cloud(netflix OSS Components). I have used netflix Eureka for service discovery, zuul for api gateway, ribbon, feign while running in my local machine.
Netflix eureka, zuul, ribbon, feign spring cloud config are not useful when we deploy to PCF?(if yes what are the alternatives available in pcf and how to configure them?)
As who are building microservices follows CI/CD approach, how developer verify working of their micro services before pushing code as we don't use eureka, zuul,ribbon,feign in production pcf. (how to simulate pcf environment in developer machine?).
I'd suggest to read below content before implementing if you have any doubt regarding usage of Eureka and Zuul, you will get all answers yourself.
https://github.com/Netflix/eureka/wiki/Eureka-at-a-glance
https://github.com/Netflix/zuul/wiki
As who are building microservices follows CI/CD approach, how developer verify working of their micro services before pushing code as we don't use eureka, zuul,ribbon,feign in production pcf.
Answer to this question is: You must be aware of JUnit test cases, so you can run you test cases using deployment pipelines to make sure all your functionalities are working as expected or you can use Test Automation for the same.
(how to simulate pcf environment in developer machine?).
Answer to this one:
You can use eclipse plugin you are using eclipse/STS IDE. Or you can connect all PCF services from you local machine using CloudFactory
#Bean
public Cloud cloud() {
return new CloudFactory().getCloud();
}
https://docs.pivotal.io/pivotalcf/2-1/buildpacks/java/sts.html
Here are some thoughts:
Eureka Service discovery: in my opinion this is not strictly necessary when running on PCF. When you push an app on PCF usually a route is assigned to your app, and you can use this Route as a poor man's service discovery. Eureka would allow you to use client-side load balancing in the case of container-to-container networking, but usually you wouldn't need this.
Zuul: Can be very useful also on CloudFoundry in case you are doing things like writing frontend-for-backend services, providing frontends for different devices (mobiles, desktops, i-pads) that use the same backend services. Might also be useful for an authentication/authorization layer or rate-limiting. One native CloudFoundry alternative would be to use route-services for tasks such as rate limiting, authentication/authorization.
spring-cloud-config: makes sense if you want your configuration to be under version control for different environments. This is useful no matter if you are running on CloudFoundry or not. I don't know of any alternatives on plain CloudFoundry.
spring-cloud-feign: makes sense if you want use annotations such as #RequestMapping with your Feign client interfaces. This is independent on if you are running on CloudFoundry or not. AFAIK there are no alternatives for this in case you want to use Spring MVC annotations with Feign.
ribbon: makes sense if you want to use client side load balancing as opposed to let the CloudFoundry router to do the load balancing for you.
How developers can check locally if this works for them:
In general, I don't believe developers should need to check locally if their app is working fine together with zuul, cloud-config-service, and eureka.
They could check this in a dev or test space or environment though.
If they really want to check this on their local machine, they could download PCFDev and run these infrastructure components there.
Hope this helps.
We can create restful API in spring boot jar file?
1)can we split multiple jar file in Apache server?
2) if we split multiple jar file how will identify which jar contain correct rest APIs
How spring boot jar file will work in server?
For Development Environment
You can configure ports via application.properties or via system properties.
Or with option to jvm --server.port=8081
So, there is no problem to run a few APIs on single machine with different ports.
You don't need Apache Server. Spring Boot has it's own embedded for you. So, you can easily use it.
Let's say you have two APIs.
localhost:8081 (Checkout Service)
localhost:8082 (Payment Service)
Hostname and port - it's your identification for each service.
When you trying to search something in Google.
You browser - it's a client.
And Google's servers - it's a server.
The same here. Checkout Service trying to delegate some job to Payment Service. So, Checkout Service - it's a client. And this client should know the address of Payment Service.
For Production Environment
You should think twice, how you will monitor performance, manage scalability and so on.
i have created two java spring-boot micro services they are
1) producer
2) consumer
and i have used spring eureka server for service registration and discovery . it worked fine . then what is the use of Netflix Zuul.
Let's suppose you have 20 services to which user can interact to, and of course we are not going to expose each and every services publicly because that will be madness (because all services will have different ports and context), so the best approach will be to use an API gateway which will act as single entry point access to our application (developed in micro service pattern) and that is where Zuul comes into picture. Zuul act as a reverse proxy to all your micro-services running behind it and is capable of following
Authentication
Dynamic Routing
Service Migration
Load Shedding
Security
Static Response handling
Active/Active traffic management
You can go through documentation here
If you have enough experience in the domain, you could look at zuul as an API gateway like Apigee. It is very feature rich and touches up on a lot of different concerns like routing, monitoring and most importantly, security. And eureka as a service discovery platform that allows you to load balance (in Linux terms the nginx or haproxy) and fail over between your service instances.
Typically the backend services that perform the server side business operations (i.e. core) are not exposed publicly due to many reasons. They are shielded by some Gateway layer that also serves as reverse-proxy. Netflix Zuul serves as this gateway layer which easily gives you the capabilities as mentioned by #Apollo and here
I'm looking for the service that can use Spring Web Framework
Of course I could set up apache web server and tomcat.
However, I'm a new user of amazon web service.
is it available to set up a server with Spring Web Framework on Amazon web service?
What kind of services can be used ? ec2? s3?
S3 is a service for storage of static content only, so you would need EC2 for that. You can provision an Ec2 instance (virtual private server) and set up your own tomcat and libraries (such as spring). Another way to go would be to use Elastic Beanstalk, that would automate the process of creating the infrastructure and you would only need to deploy your .war file.
A good resource to understand the services before starting would be the instructional videos and self paced labs you can find at http://aws.amazon.com/training/intro_series/