Docker+Dubbo+Zookeeper实现RPC远程调用
Docker+Dubbo+Zookeeper
1.安装Docker
1.1卸载旧版本的Docker
//如果Docker处于与运行状态 未运行可跳过
[root@MrADiao ~]# systemctl stop docker
//如果Docker设置了开机自启 需先删除 没有设置可自行跳过
[root@MrADiao ~]# systemctl diable docker
//卸载docker-ce
[root@MrADiao ~]# yum remove docker-ce
//删除注册表 文件夹
[root@MrADiao ~]# rm -rf /var/lib/docker
1.2.安装新版本的Docker
1、检查内核版本，必须是3.10及以上
[root@MrADiao ~]# uname -r
2.安装依赖包
[root@MrADiao ~]# yum install -y yum-utils device-mapper-persistent-data lvm2
3.添加docker软件包源
[root@MrADiao ~]#yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo
4、安装docker
[root@MrADiao ~]# yum install docker-ce
5、输入y确认安装
6.查看是否安装成功
[root@MrADiao ~]# docker version
或者
[root@MrADiao ~]# docker -v
7、启动docker
[root@MrADiao ~]# systemctl start docker
8.设置docker开机自启
[root@MrADiao ~]#systemctl enable docker
可参考Docker官方文档：https://docs.docker.com/install/linux/docker-ce/centos/
1.3.docker常用命令
-
镜像操作命令
| 操作 | 命令 | 说明 |
|---|---|---|
| 检索 | docker search 关键字 eg：docker search redis | 我们经常去docker hub上检索镜像的详细信息，如镜像的TAG。 |
| 拉取 | docker pull 镜像名:tag | :tag是可选的，tag表示标签，多为软件的版本，默认是latest |
| 列表 | docker images | 查看所有本地镜像 |
| 删除 | docker rmi image-id | 删除指定的本地镜像 |
-
容器操作命令
| 操作 | 命令 | 说明 |
|---|---|---|
| 运行 | docker run --name container-name -d image-nameeg:docker run –name myredis –d redis | –name：自定义容器名 -d：后台运行 image-name:指定镜像模板 |
| 列表 | docker ps | 查看运行中的容; 加上-a；可以查看所有容器 |
| 停止 | docker stop 容器Id | 删除指定的容器 |
| 启动 | docker start 容器id | 启动容器 |
| 删除 | docker rm 容器id | 删除一个容器 |
| 端口映射 | docker run -d -p 8888:8080 tomcat | -d：后台运行 -p: 将主机的端口映射到容器的一个端口 主机端口:容器内部的端口 |
| 容器日志 | docker logs container-name/container-id | 查看容器的日志 |
2.Docker中安装Zookeeper
2.1.从Docker Hub中获取zookeeper镜像
[root@MrADiao ~]# docker pull zookeeper
2.2.启动zookeeper
[root@MrADiao ~]# docker run --name myzookeeper -p 2181:2181 --restart always -d zookeeper //-p指定端口启动 :前的端口是linux虚拟机的端口 :后的端口是指docker容器的端口 2181:2181意思是指 把linux系统的2181端口映射到docker容器的2181端口
3.zookeeper+dubbo简单代码实现
3.1创建服务端项目(provider-ticket)
首先创建一个SpringBoot项目
3.1.1Pom.xml
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0modelVersion>
<groupId>com.adiaogroupId>
<artifactId>provider-ticketartifactId>
<version>0.0.1-SNAPSHOTversion>
<packaging>jarpackaging>
<name>provider-ticketname>
<description>Demo project for Spring Bootdescription>
<parent>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-starter-parentartifactId>
<version>1.5.12.RELEASEversion>
<relativePath/>
parent>
<properties>
<project.build.sourceEncoding>UTF-8project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8project.reporting.outputEncoding>
<java.version>1.8java.version>
properties>
<dependencies>
<dependency>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-starter-webartifactId>
dependency>
<dependency>
<groupId>com.alibaba.bootgroupId>
<artifactId>dubbo-spring-boot-starterartifactId>
<version>0.1.0version>
dependency>
<dependency>
<groupId>com.github.sgroschupfgroupId>
<artifactId>zkclientartifactId>
<version>0.1version>
dependency>
<dependency>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-starter-testartifactId>
<scope>testscope>
dependency>
dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-maven-pluginartifactId>
plugin>
plugins>
build>
project>
3.1.2 application.properties
dubbo.application.name=provider-ticket
dubbo.registry.address=zookeeper://部署zookeeper服务器IP:2181
dubbo.scan.base-packages=com.adiao.ticket.service
server.port=8081
3.1.3创建一个TicketService
package com.adiao.ticket.service;
public interface TicketService {
public String getTicket();
}
3.1.4实现TicketService
package com.adiao.ticket.service;
import com.alibaba.dubbo.config.annotation.Service;
import org.springframework.stereotype.Component;
@Component
@Service
public class TicketServiceImpl implements TicketService {
@Override
public String getTicket() {
return "《厉害了，我的国》";
}
}
注意：@Service注解是dubbo下的，作用是将服务发布出去
3.2创建调用方
3.2.1创建调用方项目(consumer-user)
首先创建一个SpringBoot项目
3.2.2 pom.xml
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0modelVersion>
<groupId>com.adiaogroupId>
<artifactId>consumer-userartifactId>
<version>0.0.1-SNAPSHOTversion>
<packaging>jarpackaging>
<name>consumer-username>
<description>Demo project for Spring Bootdescription>
<parent>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-starter-parentartifactId>
<version>1.5.12.RELEASEversion>
<relativePath/>
parent>
<properties>
<project.build.sourceEncoding>UTF-8project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8project.reporting.outputEncoding>
<java.version>1.8java.version>
properties>
<dependencies>
<dependency>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-starter-webartifactId>
dependency>
<dependency>
<groupId>com.alibaba.bootgroupId>
<artifactId>dubbo-spring-boot-starterartifactId>
<version>0.1.0version>
dependency>
<dependency>
<groupId>com.github.sgroschupfgroupId>
<artifactId>zkclientartifactId>
<version>0.1version>
dependency>
<dependency>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-starter-testartifactId>
<scope>testscope>
dependency>
dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-maven-pluginartifactId>
plugin>
plugins>
build>
project>
3.2.3application.properties
dubbo.application.name=consumer-user
dubbo.registry.address=zookeeper://部署zookeeper服务器IP:2181
server.port=8082
3.2.3 创建与被调用放一样的Service
package com.adiao.ticket.service;
public interface TicketService {
public String getTicket();
}
3.2.4创建一个调用方自己的Service
package com.adiao.user.service;
import com.alibaba.dubbo.config.annotation.Reference;
import com.adiao.ticket.service.TicketService;
import org.springframework.stereotype.Service;
@Service
public class UserService{
@Reference//注入的是分布式中的远程服务对象
TicketService ticketService;
public void hello(){
String ticket = ticketService.getTicket();
System.out.println("买到票了："+ticket);
}
}
3.3测试
在main/test/java/下创建测试类，一定要确保被调用方 也就是provider-ticket处于运行状态
package com.adiao.user;
import com.adiao.user.service.UserService;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;
@RunWith(SpringRunner.class)
@SpringBootTest
public class ConsumerUserApplicationTests {
@Autowired
UserService userService;
@Test
public void contextLoads() {
userService.hello();
}
}