spring社区版PetClinic微服务项目技术栈及架构简介

PetClinic微服务Docker Compose 部署文件简析

Docker-Compose: 是可以一键运行/关闭Docker容器(只要在开发测试使用)，规范服务镜像的依赖关系的管理Docker容器的工具。

docker-compose up 一键启动

docker-compose down 一键关闭 ```yaml version: '2' services: ## 服务名称   config-server:   ## 镜像名称
image: springcommunity/spring-petclinic-config-server   ## 容器名称  
container_name: config-server   ## 内容限制    
mem_limit: 512M   ## 端口号映射关系    
ports:
 - 8888:8888 ``` ```yaml  discovery-server:
image: springcommunity/spring-petclinic-discovery-server
container_name: discovery-server
mem_limit: 512M
## 规范容器动动顺序  config-server容器启动后再启动
depends_on:
  - config-server
  ## 规范容器内部应用启动顺序
  ## 等待config-server服务启动后再启动该服务 
entrypoint: ["./dockerize","-wait=tcp://config-server:8888","-timeout=60s","--","java", "-XX:+UnlockExperimentalVMOptions", "-XX:+UseCGroupMemoryLimitForHeap", "-Djava.security.egd=file:/dev/./urandom","-jar","/app.jar"]
ports:
 - 8761:8761

customers-service: image: springcommunity/spring-petclinic-customers-service container_name: customers-service mem_limit: 512M depends_on: - config-server - discovery-server entrypoint: [”./dockerize”,”-wait=tcp://discovery-server:8761”,”-timeout=60s”,”–”,”java”, “-XX:+UnlockExperimentalVMOptions”, “-XX:+UseCGroupMemoryLimitForHeap”, “-Djava.security.egd=file:/dev/./urandom”,”-jar”,”/app.jar”] ports: - 8081:8081

visits-service: image: springcommunity/spring-petclinic-visits-service container_name: visits-service mem_limit: 512M depends_on: - config-server - discovery-server entrypoint: [”./dockerize”,”-wait=tcp://discovery-server:8761”,”-timeout=60s”,”–”,”java”, “-XX:+UnlockExperimentalVMOptions”, “-XX:+UseCGroupMemoryLimitForHeap”, “-Djava.security.egd=file:/dev/./urandom”,”-jar”,”/app.jar”] ports: - 8082:8082

vets-service: image: springcommunity/spring-petclinic-vets-service container_name: vets-service mem_limit: 512M depends_on: - config-server - discovery-server entrypoint: [”./dockerize”,”-wait=tcp://discovery-server:8761”,”-timeout=60s”,”–”,”java”, “-XX:+UnlockExperimentalVMOptions”, “-XX:+UseCGroupMemoryLimitForHeap”, “-Djava.security.egd=file:/dev/./urandom”,”-jar”,”/app.jar”] ports: - 8083:8083

api-gateway: image: springcommunity/spring-petclinic-api-gateway container_name: api-gateway mem_limit: 512M depends_on: - config-server - discovery-server entrypoint: [”./dockerize”,”-wait=tcp://discovery-server:8761”,”-timeout=60s”,”–”,”java”, “-XX:+UnlockExperimentalVMOptions”, “-XX:+UseCGroupMemoryLimitForHeap”, “-Djava.security.egd=file:/dev/./urandom”,”-jar”,”/app.jar”] ports: - 8080:8080

tracing-server: image: openzipkin/zipkin container_name: tracing-server mem_limit: 512M environment: - JAVA_OPTS=-XX:+UnlockExperimentalVMOptions -Djava.security.egd=file:/dev/./urandom ports: - 9411:9411

admin-server: image: springcommunity/spring-petclinic-admin-server container_name: admin-server mem_limit: 512M depends_on: - config-server - discovery-server entrypoint: [”./dockerize”,”-wait=tcp://discovery-server:8761”,”-timeout=60s”,”–”,”java”, “-XX:+UnlockExperimentalVMOptions”, “-XX:+UseCGroupMemoryLimitForHeap”, “-Djava.security.egd=file:/dev/./urandom”,”-jar”,”/app.jar”] ports: - 9090:9090

## Grafana / Prometheus

grafana-server: build: ./docker/grafana container_name: grafana-server mem_limit: 256M ports: - 3000:3000

prometheus-server: build: ./docker/prometheus container_name: prometheus-server mem_limit: 256M ports: - 9091:9090 ```

简析doker-compose.yml注意点:

• dopends_on 定义容器依赖和启动次序
• dockerrize命令规范容器内应用依赖和启动次序
• 通过mem_limit限制容器可以内存,配合JVM UseCGroupMemoryLimitForHeap参数完成限制
• Docker-compose会内键一个网络,服务之间可以通过服务名相互访问

PetClinic微服务的基本功能描述

• Angularjs 主界面
• Eureka Server UI 服务注册中心
• Admin Server UI 监控/配置服务实例内部状态
• zipkin Tracing Server UI 调用链和依赖监控
• Promethues Metircs监控作图
• Grafana Dashboard + JMeter Metrics 展示 + 压测

Springcloud版PetClinic微服务 与 K8s版PetClinic微服务架构和技术栈差异

微服务公共关注点

系统架构对比

技术栈差异

Springcloud版PetClinic微服务 VS K8s版PetClinic微服务

• SC未解决服务自动化部署问题,==K8s是容器化微服务调度发布平台==
• K8s内置支持发现 + loadbalance
• k8s平台对具体服务架构无关
• SC：组件框架式架构 K8s：平台型架构
• K8S是面向容器和微服务的云计算平台