使用SpringCloudConfig实现集中配置并发布为Docker微服务.pdf

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1、3/2/20171使用Spring Cloud Config实现集中配置并发布为Docker微服务2017 年 2月一、Spring Cloud 用来解决什么问题Spring Cloud 是 Pivotal提供的用于简化分布式系统构建的工具集，开源软件。Spring Cloud 为开发人员提供了工具，快速建立分布式系统中的一些常见的模式（例如配置管理，服务发现，断路器，智能路由，微代理，控制总线，一次性令牌，全局锁，领导选举，分布式会话，集群状态）。Spring Cloud基于 Spring Boot等工具集，Spring有一套解决方案。3/2/20172一、Spring Cloud 用来解决

2、什么问题?Centralized external configurationmanagementbacked by agit repository.The configurationresources map directly toSpring Environmentbut could be used by non Spring applicationsif desired.Spring Cloud Config?Integrationwith various Netflix OSScomponents(Eureka,Hystrix,Zuul,Archaius,etc.).Spring Cl

3、oud Netflix?An event bus for linkingservices and service instances togetherwith distributedmessaging.Useful for propagatingstate changes across a cluster(e.g.config change events).Spring Cloud Bus?Integratesyour applicationwith Pivotal Cloudfoundry.Provides aservice discovery implementationand also

4、makes iteasy to implementSSOand OAuth2 protectedresources,and also to create a Cloudfoundryservice broker.Spring Cloud for Cloud Foundry?Provides astartingpoint for building a service brokerthat manages a Cloud Foundry managed service.Spring CloudCloud Foundry ServiceBroker?Leadership election and c

5、ommonstateful patterns with an abstractionand implementationfor Zookeeper,Redis,Hazelcast,Consul.Spring Cloud Cluster?Service discovery and configurationmanagementwith Hashicorp Consul.Spring Cloud Consul?Provides support for load balanced OAuth2 rest client and authenticationheader relays in aZuul

6、proxy.Spring CloudSecurity?Distributedtracing for Spring Cloud applications,compatiblewith Zipkin,HTrace and log based(e.g.ELK)tracing.Spring Cloud Sleuth一、Spring Cloud 用来解决什么问题?A cloud native orchestration service for composable microservice applications on modern runtimes.Easy to useDSL,drag anddr

7、op GUI,and REST APIstogether simplifies the overall orchestration of microservice based data pipelines.Spring Cloud DataFlow?A lightweight event driven microservices framework to quickly build applications that canconnect toexternal systems.Simpledeclarative model to sendand receive messages using A

8、pache Kafka or RabbitMQ between Spring Boot apps.SpringCloud Stream?Spring CloudStream App Starters areSpringBoot based SpringIntegration applications that provide integration with external systems.Spring Cloud StreamApp Starters?A short lived microservices framework to quickly build applications th

9、at perform finite amounts of data processing.Simpledeclarative for addingbothfunctional and non functional features to Spring Boot apps.Spring Cloud Task?Spring CloudTask App Starters are SpringBoot applications that may be anyprocess including Spring Batch jobs that do not runforever,and theyend/st

10、op after a finite period ofdata processing.SpringCloud TaskApp Starters?Service discovery and configuration management with Apache Zookeeper.SpringCloud Zookeeper?Easyintegration with hosted Amazon Web Services.It offers a convenient wayto interact with AWSprovided services using well known Springid

11、ioms andAPIs,such asthe messagingor caching API.Developers canbuild their application around the hosted serviceswithouthaving to care about infrastructureor maintenance.Spring Cloudfor Amazon Web Services?Makes it easyfor PaaSapplications in a variety ofplatforms to connect to backend serviceslike d

12、atabases andmessagebrokers(the project formerlyknown as SpringCloud).SpringCloud Connectors?Spring Boot style starter projects to easedependency management for consumers of SpringCloud.(Discontinued asa project andmerged with the otherprojects afterAngel.SR2.)Spring Cloud Starters?Spring Boot CLI pl

13、ugin for creating Spring Cloudcomponent applications quickly in GroovySpring Cloud CLI3/2/20173一、Spring Cloud 用来解决什么问题提供集中式的外部配置管理服务，基于GIT 配置库。配置资源可以直接映射到Spring的“Environment”，也能给非Spring程序用。一、Spring Cloud 用来解决什么问题配置与程序分离3/2/20174二、运行 Demohttp:/spring.io/guides/gs/centralized-configuration/http:/cloud

14、.spring.io/spring-cloud-config/二、运行 Demo3/2/20175configuration-service：服务端，是一个Web服务器，从GIT 获得配置信息configuration-client：客户端，也是一个Web服务器，从server端获取配置信息二、运行 Demoapplication.properties中的配置：server.port，端口号spring.cloud.config.server.git.uri，Git 配置库的地址二、运行 Demo3/2/20176POM 配置：基于 Spring Boot启动Spring cloud conf

15、igServer二、运行 Demo需要加EnableConfigServer二、运行 Demo3/2/20177bootstrap.properties中的配置：spring.application.name，客户端应用的名字spring.cloud.config.uri，服务端地址二、运行 DemoPOM 配置：也是基于Spring Boot二、运行 Demo3/2/20178在 GitLab创建一个工程二、运行 Demo在 Git 库中增加a-bootiful-client.properties注意：文件名和client中配置的应用名字相同执行命令：git init git clone h

16、ttp:/192.168.99.101/xxx/First.gitgit add a-bootiful-client.propertiesgit commit-m add client.propertiesgit push-u origin master二、运行 Demo3/2/20179a-bootiful-client.properties可以是一个YAML文件二、运行 Demo先启动Server：二、运行 Demo3/2/201710再启动client，访问http:/localhost:8080/message就能显示在a-bootiful-client.properties中配置的m

17、essage 了二、运行 DemoRefreshScope标签通过http:/localhost:8080/refresh刷新配置二、运行 Demo3/2/201711修改 a-bootiful-client.propertiesCommit、push 到 GIT以 POST方式，执行http:/localhost:8080/refresh二、运行 Demo服务端刷新，如果是windows系统，新的配置文件被GIT 同步到当前用户目录的 AppData/Temp目录下客户端刷新，重新从localhost:8888取配置信息二、运行 Demo3/2/201712新建工程，用mvninstall得

18、到 config-service-0.0.1-SNAPSHOT.jar二、运行 Demo写好 Dockerfile可以基于openjdk:8-jre-alpine构建二、运行 Demo3/2/201713因为是Windows 系统，在MINGW64中：cd/D/config-serverTouch dockerfiledockerbuild-t config-server.二、运行 Demo启动 Server的命令：dockerrun-h 172.17.0.1-p 8888:8888 config-server二、运行 Demo3/2/201714把 Client中配置的Server地址改为微

19、服务地址：http:/192.168.99.100:8888二、运行 Demo在命令行运行时，-传参数和在application.properties中配置属性值是一样的java-jar xxx.jar-server.port=8888命令，等价于在application.properties中添加属性server.port=8888考虑到安全性，Spring Boot提供了程序开关，可以屏蔽在命令行中配置属性：SpringApplication.setAddCommandLineProperties(false)二、运行 Demo3/2/201715在 Dockerfile中，用$属性名:-

20、缺省值获得环境变量两个变量名自定义，例如：PORT、GITURI在启动微服务时传入参数：docker run-d-h 172.17.0.1-p 8888:8888-e PORT=8888-e GITURI=http:/192.168.99.100/xxx/first.git config-server二、运行 Demo重新做镜像，在启动微服务的dockerrun 命令行中，用-e 传入对应的环境变量（PORT、GITURI）：docker run d-h 172.17.0.1-p 8888:8888-e PORT=8888-e GITURI=http:/192.168.99.100/xxx/f

21、irst.git config-server注释掉application.properties中的配置信息二、运行 Demo3/2/201716三、理解 Spring Cloud Config的用法Environment Repository是一个逻辑概念，用来保存Spring的环境变量（Environment），每个 Environment依赖于3个参数定位：application，映射到客户端的spring.application.nameprofile映射到客户端的“spring.profiles.active”，使用逗号分隔label服务器端配置文件的“版本“三、理解 Spring C

22、loud Config的用法例如，在前面执行的Demo中，对应的参数值：application:a-bootiful-clientprofiles:defaultlabel:master在浏览器中访问：http:/192.168.99.101:8888/a-bootiful-client/default/master显示 Environment3/2/201717三、理解 Spring Cloud Config的用法org.springframework.cloud.config.environment.Environment.EnvironmentRepository类只有一个方法，传入ap

23、plication、profile、label三个参数三、理解 Spring Cloud Config的用法缺省返回JSON格式，Spring提供了以下访问方式：/application/profile/label/application-profile.yml/label/application-profile.yml/application-profile.properties/label/application-profile.properties可见，只要提交一种格式的配置文件，通过不同访问方式，得到不同格式的配置文件3/2/201718三、理解 Spring Cloud Config

24、的用法org.springframework.cloud.config.server.environmentEnvironmentController中使用 RequestMapping声明了所有的配置文件转换方式，实际上内部都是Environment对象三、理解 Spring Cloud Config的用法Label标签可以对应于GIT 的分支名称、commit id或其他标签。更新到分支git add firstclient.ymlgit commit-m firstclient.yml for branch1git push origin branch13/2/201719三、理解 Sp

25、ring Cloud Config的用法传到 GIT 的是 YML文件，可以用/label/application-profile.properties获得 properties格式，反过来也可以三、理解 Spring Cloud Config的用法用/name/profile/label/path格式访问，path 为 Plain Text的文件名将 Plain Text文件和yml 配置文件放到同一个目录下git add nginx.confgit commit-m add nginx.confgit push origin master3/2/201720三、理解 Spring Clou

26、d Config的用法三、理解 Spring Cloud Config的用法基于 Spring Boot，因此具备Health Indicator：缺省缓存时间5分钟，可以用health.config.time-to-live设置，单位为毫秒。也可以用health.config.enabled=false关闭。3/2/201721四、附录：错误和解决方法服务端：Authentication is required but no CredentialsProviderhas been registered客户端：Could not locate PropertySource:timestamp:

27、1486692863322,status:500,error:Internal Server Error,exception:java.lang.IllegalStateException,message:Cannot clone or checkout repository,path:/a-bootiful-client/default四、附录：错误和解决方法将 GIT 服务设置为Public3/2/201722四、附录：错误和解决方法报和 Test 有关的错，在targetsurefire-reports目录的报错文件中：Unable to find a SpringBootConfigu

28、ration,you need to use ContextConfigurationor SpringBootTest(classes=.)with your test原因是程序与test的包名不一致，修改后mvninstall通过四、附录：错误和解决方法open/./pipe/docker_engine:The system cannot find the file specified.原因是VirtualBox虚拟机的IP 地址从192.168.101 改变到192.168.100，重新执行docker-machine envdocker-machine regenerate-certsdefault 即可修复3/2/201723