I followed this documentation for Archaius and some other online articles. However, presumably, each service should have Archaius or configuration related codes/dependencies(-jars) to load configuration values. My concern is that if a change is required in loading configuration, then each service has to be reloaded/redeployed.
Q1. Can anyone let me know how to keep a centralized Archaius configuration service so that client services pull configurations.
On the contrary, Spring Cloud Config server does that job - all configurations are in one place. But I feel that it lacks loading configurations from a custom resource - data loads from a database as Archaius provides, for example.
Q2. Is there a work around to make Config Server loads configurations from Archaius ?
For Q1, you should look at the 2.x branch of Archaius, specifically https://github.com/Netflix/archaius/blob/2.x/archaius2-persisted2/src/main/java/com/netflix/archaius/persisted2/Persisted2ConfigProvider.java. This is configured to make a rest call to some service which will front your Config. At Netflix, we have a rest service backed by Cassandra. Naturally, you can back that with whatever you would like. But fair warning, this Archaius setup was made for Guice and requires a bit of manual setup. It is not quite as seamless as you might expect if you've been working with Spring Boot/Cloud starters for example.
For Q2, Spring Cloud Config does indeed support loading data from a DB. Also, in my experience with the Spring products, they are almost always quite easy to extend to your own purposes if you'd like to do something more custom.
General suggestion: If you have no other need/use of Archaius aside from remote config and you are a Spring user, I'd suggest just going with Spring Cloud. It would be far easier to configure and probably serve your requirements just fine.
Archaius provides a way to deal with reading dynamically changing Config with minimal performance impact. If you're not in Spring, or happen to need fast access to dynamic properties, consider Archaius.
Related
I'm confused about Spring Cloud Data Flow Server deployment...
We are planning to run it on cloudfoundry, and the instructions say one should download the final server artifact (a jar) and deploy it.
On the other hand another section in the documentation describes a way on how to customize the provisioning of roles to users with some custom code. But there is no explanation on how to embed the server in a custom application so I can provide my code (via #Bean).
On a very old blog post I found a mention of #EnableDataFlowServer but this annotation is not described in the official documentation anymore - is it still valid?
There is also no way described how I could use any other security then oauth, do I really need to use oauth? how about using my own security config or even only basic authentication?
I kind of expected the same flexibility as spring cloud config server provides...
You can check the Spring Cloud Data Flow site on how to install SCDF on Cloud Foundry. The instructions in this site have the correct information set up SCDF on CF.
The #EnableDataFlowServer is intended for customizing Spring Cloud Data Flow server using/overriding the existing DataFlowServerAutoConfiguration and DataFlowControllerAutoConfiguration. This is not specific to CF though.
I am building a middle tier which will consume information from multiple downstream systems. The ask is to talk to them over 1 way SSL. I looked up samples but this concept is a bit if a mystery to me. Please help.
The question is too vague IMHO, I'll try to provide general insights
The answer may vary depending on the actual requirements in your organization security department and your actual spring boot configuration.
Spring Boot is a Java framework that usually allows the deployment architecture with an embedded tomcat, jetty or undertow servers that serve Http endpoints exposed by Spring MVC or without an embedded server at all (usually for legacy deployments)
If you in a "legacy" mode (build a WAR) - then HTTPs configuration should be done on the actual server and not in spring boot application.
If you use an embedded server, then the actual technical solution can actually depend on the server you use underneath, at least to some extent.
Indeed like Steffen Ullrich has stated in the comment section, there are many examples of doing this.
For example, take a look at This one
If you want to redirect HTTP requests to HTTPs you should configure your server to do so, and this solution is Tomcat specific.
Another thing to consider is whether you want to use SSL at the level of spring boot at all. Maybe you're running under the gateway / some kind of proxy. In this case, it can make sense to use https for accessing the proxy from outside, but from a proxy to java application you could use HTTP.
I know I'm just speculating about this solution, I've just decided to mention it because in my experience there are many organizations that work like this.
In addition, since spring boot is used for microservice development, the chances are that you have many spring boot artifacts that somehow "talk" to each other, so maybe running HTTPs between them is redundant.
I am new and just started to explore Spring Cloud. Would like to know how to practice with examples in local (laptop). It appears to need a cloud environment. And most of them are available only for few days. So any pointers to try out features like
Distributed/versioned configuration, Service registration and discovery ,Routing Service-to-service calls, Load balancing Circuit and Breakers Global locks
You can check out the Spring guides where we guide you, step by step, to achieve what you have described. You can check out the link here for the Ribbon guide -
https://spring.io/guides/gs/client-side-load-balancing/ and the link to all of the guides https://spring.io/guides/
You can also check this blog, service discovery, routing and load balancing.
Spring Cloud, Eureka and Zuul
For Distributed/versioned configuration, check this one
Quick Intro to Spring Cloud Configuration
Also one example, that brings all of that together Spring Cloud Bootstrapping
I have spring web application (not spring boot) running in AWS. I am trying to create centralized configuration server. How to refresh the spring-cloud-client after the changing the properties? As per tutorial
Actuator endpoint by sending an empty HTTP POST to the client’s refresh endpoint, http://localhost:8080/refresh, and then confirm it worked by reviewing the http://localhost:8080/message endpoint.
But my aws Ec2 instances are behind the loadbalancer so i can't invoke the client url. I didn't understand the netflix Eureka and Ribbon much but it seems like adding another level of load balancer in the client side. I don't like this approach. Just to change a property i don't want to make the existing project unnecessarily complex. Is there any other way? or Am I misunderstood Eureka/Ribbon usage?
I have looked at the spring-cloud-config-client-without-spring-boot, spring-cloud-config-client-without-auto-configuration none of them have answer. First thread was answered in 2015. Wondering is there any update?
To get the configuration properties from a config server. You can do a http request. Example:
From the documentation we can see:
/{application}/{profile}[/{label}]
/{application}-{profile}.yml <- example
/{label}/{application}-{profile}.yml
/{application}-{profile}.properties
/{label}/{application}-{profile}.properties
So if you would do a request to http://localhost:8080/applicationName-activeProfile.yml you would receive the properties in .yml format for the application with that name and active profile. Spring boot config clients would automatically provide these values but you will have to provide em manually.
You don't need Eureka/Ribbon for this to work, it's a separate component.
More info: http://cloud.spring.io/spring-cloud-static/spring-cloud.html#_spring_cloud_config
Maybe you could even use spring-cloud-config but I'm not sure what extra configuration is needed without spring-boot.
https://cloud.spring.io/spring-cloud-config/
If I have multiple Spring Boot embedded tomcat containers and each can have service endpoints like
http://localhost:8080/employeeSelfService/getDetails
http://localhost:8081/employeeSelfService/getDetails
How can do load balancing using 2 micro services such that clients can hit any of the URL's mentioned based on some load balancing startegy
One option thats come to my mind is to use NetFlix Curator (or) have a apache webserver acting as reverse proxy but with apache, when you create new instances of your services, you will have have an entry of that service as a member in httpd.conf
Does Spring Boot provides any service discovery and load balancing mechanism ?
Spring Boot does not provide this feature, as it is already usually provided by a reverse proxy such as apache/nginx running in front of the Spring Boot server.
See here for an example here how the commercial version of nginx provides the functionality of dynamically scaling and reducing the upstream nodes.
So in this case it's for the dynamic instance, in this case the Spring Boot process to signal it's presence/unregister itself to the upstream server at initialization/shutdown.
See here how to do so in the case of nginx, this procedure will be different from server to server.
Arguably it's not really an application's role to manage its own load-balancing, and Spring Boot focuses on the implementation of an application (or service, equivalently). We have been thinking about whether we could provide features in Spring (Boot or otherwise) to make it easy to write your own load-balancer, or service registry app, but even then I don't think that was what the question was really about (or was it?).
If I interpret the question, and the example use case, literally, I would say that the most natural answer is an out-of-the-box reverse proxy solution (as the other answers pointed out). I also note that such a reverse proxy is an essential and natural part of a PaaS solution, so if you need it to "just work" and don't want to know about the details, PaaS would be a natural path (e.g. see cloudfoundry as an example of such a solution that I happen to have worked on).
Indeed Spring Boot has not inherit support for load-balancing. Just to add to the list of available solutions for load-balancing, here are the instructions to configure an Apache for load-balancing.