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-.hide-for-print{display:none!important} -.show-for-print{display:inherit!important}} \ No newline at end of file diff --git a/spring-cloud.html b/spring-cloud.html index 8809bd8..00280d1 100644 --- a/spring-cloud.html +++ b/spring-cloud.html @@ -4,18 +4,428 @@ - + Spring Cloud - + - + + +

Spring Cloud Config

+
+
+Spring Cloud Config provides server and client-side support for externalized configuration in a distributed system. With the Config Server you have a central place to manage external properties for applications across all environments. The concepts on both client and server map identically to the Spring Environment and PropertySource abstractions, so they fit very well with Spring applications, but can be used with any application running in any language. As an application moves through the deployment pipeline from dev to test and into production you can manage the configuration between those environments and be certain that applications have everything they need to run when they migrate. The default implementation of the server storage backend uses git so it easily supports labelled versions of configuration environments, as well as being accessible to a wide range of tooling for managing the content. It is easy to add alternative implementations and plug them in with Spring configuration. +
+
+
+

Quick Start

+
-

Unresolved directive in spring-cloud.adoc - include::../../../config/src/main/asciidoc/spring-cloud-config.adoc[]

+

Start the server:

+
+
+
+
$ cd spring-cloud-config-server
+$ mvn spring-boot:run
+
+
+
+

The server is a Spring Boot application so you can build the jar file +and run that (java -jar …​) or pull it down from a Maven +repository. Then try it out as a client:

+
+
+
+
$ curl localhost:8888/foo/development
+{"name":"development","label":"master","propertySources":[
+  {"name":"https://github.com/scratches/config-repo/foo-development.properties","source":{"bar":"spam"}},
+  {"name":"https://github.com/scratches/config-repo/foo.properties","source":{"foo":"bar"}}
+]}
+
+
+
+

The default strategy for locating property sources is to clone a git +repository (at "spring.platform.config.server.uri") and use it to +initialize a mini SpringApplication. The mini-application’s +Environment is used to enumerate property sources and publish them +via a JSON endpoint. The service has resources in the form:

+
+
+
+
/{application}/{profile}[/{label}]
+
+
+
+

where the "application" is injected as the "spring.config.name" in the +SpringApplication (i.e. what is normally "application" in a regular +Spring Boot app), "profile" is an active profile (or comma-separated +list of properties), and "label" is an optional git label (defaults to +"master").

+
+
+

Client Side Usage

+
+

To use these features in an application, just build it as a Spring +Boot application that depends on spring-cloud-config-client +(e.g. see the test cases for the config-client, or the sample app). +When it runs it will pick up the external configuration from the +default local config server on port 8888 if it is running. To modify +the startup behaviour you can change the location of the config server +using bootstrap.properties (like application.properties but for +the bootstrap phase of an application context), e.g.

+
+
+
+
spring.platform.config.uri: http://myconfigserver.com
+
+
+
+

The bootstrap properties will show up in the /env endpoint as a +high-priority property source, e.g.

+
+
+
+
$ curl localhost:8080/env
+{
+  "profiles":[],
+  "configService:https://github.com/scratches/config-repo/bar.properties":{"foo":"bar"},
+  "servletContextInitParams":{},
+  "systemProperties":{...},
+  ...
+}
+
+
+
+

(a property source called "configService:<URL of remote +repository>/<file name>" contains the property "foo" with value +"bar" and is highest priority).

+
+
+
+

Sample Application

+
+

There is a sample application +here. It +is a Spring Boot application so you can run it using the usual +mechanisms (for instance "mvn spring-boot:run"). When it runs it will +look for the config server on "http://localhost:8888" by default, so +you could run the server as well to see it all working together.

+
+
+

The sample has a test case where the config server is also started in +the same JVM (with a different port), and the test asserts that an +environment property from the git configuration repo is present. To +change the location of the config server just set +"spring.platform.config.uri" in "bootstrap.yml" (or via System +properties etc.).

+
+
+

The test case has a main() method that runs the server in the same +way (watch the logs for its port), so you can run the whole system in +one process and play with it (e.g. right click on the main in your IDE +and run it). The main() method uses target/config for the working +directory of the git repository, so you can make local changes there +and see them reflected in the running app.

+
+
+
+
$ curl localhost:8080/env/foo
+bar
+$ vi target/config/bar.properties
+.. change value of "foo", optionally commit
+$ curl localhost:8080/refresh
+["foo"]
+$ curl localhost:8080/env/foo
+baz
+
+
+
+

The refresh endpoint reports that the "foo" property changed.

+

Spring Cloud Netflix

-
-

This project provides Netflix OSS integrations for Spring Boot apps through autoconfiguration +

+
+This project provides Netflix OSS integrations for Spring Boot apps through autoconfiguration and binding to the Spring Environment and other Spring programming model idioms. With a few simple annotations you can quickly enable and configure the common patterns inside your application and build large distributed systems with battle-tested Netflix components. The patterns provided include Service Discovery (Eureka), Circuit Breaker (Hystrix), -Intelligent Routing (Zuul) and Client Side Load Balancing (Ribbon).

+Intelligent Routing (Zuul) and Client Side Load Balancing (Ribbon). +

Service Discovery: Eureka Clients

@@ -228,25 +771,31 @@ normal Eureka functionality under /v2/*.

Spring Cloud Cluster

-
-

Spring Cloud Cluster offers a set of primitives for building "cluster" +

+
+Spring Cloud Cluster offers a set of primitives for building "cluster" features into a distributed system. Example are leadership election, -consistent storage of cluster state, global locks and one-time tokens.

+consistent storage of cluster state, global locks and one-time tokens. +

Spring Platform Bus

-
-

Spring Cloud Bus links nodes of a distributed system with a lightweight message broker. This can then be used to broadcast state changes (e.g. configuration changes) or other management instructions.

+
+
+Spring Cloud Bus links nodes of a distributed system with a lightweight message broker. This can then be used to broadcast state changes (e.g. configuration changes) or other management instructions. +
-

Quick Start

+

Quick Start

Spring Cloud for Cloud Foundry

-
-

Integration between Cloud Foundry -and Spring Cloud.

+
+
+Integration between Cloud Foundry +and Spring Cloud. +

Service Broker Example

@@ -333,7 +882,7 @@ with Eureka will also become a Cloud Foundry service.