Docker之docker-compose

docker-compose 是一个把 docker 自动化的工具。可以把所有繁复的 docker 操作全都一条命令，自动化的完成。就好比每一个docker容器是一个生产车的机器，但是机器不能自动生产车，需要一系列有序的顺序控制才能完整的生产车，这就是docker-compose。包括从容器的构建到容器间的相互配合使用。

docker+springboot+nginx+mysql实现负载均衡

代码：https://github.com/jiajia154569836/dockercompose-springboot-mysql-nginx
项目目录结构

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1.java代码 记录服务器IP和客户端访问IP

@RestController
public class VisitorController {

    @Autowired
    private VisitorRepository repository;
    
    @RequestMapping("/")
    public String index(HttpServletRequest request) throws UnknownHostException {
        String ip=request.getRemoteAddr();
        Visitor visitor=repository.findByIp(ip);
        if(visitor==null){
            visitor=new Visitor();
            visitor.setIp(ip);
            visitor.setTimes(1);
        }else {
            visitor.setTimes(visitor.getTimes()+1);
        }
        repository.save(visitor);
        InetAddress address = InetAddress.getLocalHost();
        //System.out.println(address.getHostName());//主机名
        return "当前服务器名:"+address.getHostName()+"当前服务器ip"+address.getHostAddress()+"I have been seen ip "+visitor.getIp()+" "+visitor.getTimes()+" times.";
    }
}

2.application-docker.properties

spring.datasource.url=jdbc:mysql://mysql:3306/test
spring.datasource.username=root
spring.datasource.password=123456
spring.datasource.driver-class-name=com.mysql.jdbc.Driver

注意：这里的mysql:3306中mysql在docker中是一个服务

3.与app同级目录下新建docker-compose.yaml

version: '3'
services:
  nginx:
   container_name: v-nginx
   image: nginx:1.13
   restart: always
   ports:
   - 80:80
   - 443:443
   volumes:
   - ./nginx/conf.d:/etc/nginx/conf.d
    
  mysql:
   container_name: v-mysql
   image: mysql/mysql-server:5.7
   environment:
    MYSQL_DATABASE: test
    MYSQL_ROOT_PASSWORD: 123456
    MYSQL_ROOT_HOST: '%'
   ports:
   - "3306:3306"
   restart: always
    
  app-1:
    restart: always
    build: ./app
    working_dir: /app
    volumes:
      - ./app:/app
      - ~/.m2:/root/.m2
    expose:
      - "8080"
    depends_on:
      - nginx
      - mysql
    command: mvn clean spring-boot:run -Dspring-boot.run.profiles=docker

  app-2:
    restart: always
    build: ./app
    working_dir: /app
    volumes:
      - ./app:/app
      - ~/.m2:/root/.m2
    expose:
      - "8080"
    depends_on:
      - nginx
      - mysql
   command: mvn clean spring-boot:run -Dspring-boot.run.profiles=docker

4.与app同级目录下新建nginx目录结构如下

image.png

app.conf目录

upstream app {
    server dockercomposespringbootmysqlnginx_app-1:8080;
    server dockercomposespringbootmysqlnginx_app-2:8080;
    }

server {
    listen 80;
    charset utf-8;
    access_log off;

    location / {
        proxy_pass http://app;
        proxy_set_header Host $host:$server_port;
        proxy_set_header X-Forwarded-Host $server_name;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    }

    location /static {
        access_log   off;
        expires      30d;

        alias /app/static;
    }
}

注意这里的server dockercomposespringbootmysqlnginx_app-1:8080;
这需要先输入命令:docker ps查看起的springboot项目的名字

image.png
当nginx报错的时候就是这里的问题：是项目名字错误因为重新部署的过程中项目名会根据版本在后面_1

5.用winscp工具上传文件

image.png

6.这里有个技巧就是先运行一下项目然后将项目需要的jar包下载下来然后将这些jar也复制到对应的目录中去，这样可以节省下在的时间

image.png

7.进入dockercompose-springboot-mysql-nginx

cd dockercompose-springboot-mysql-nginx
docker-compose up

然后下面的信息时

image.png

8.在页面输入http://192.168.229.134/ 并多次切换

image.png

当发现两个服务器IP不同则实现负载
关闭服务

docker-compose down

至此docker+springboot+nginx+mysql实现负载均衡完成
代码：https://github.com/jiajia154569836/dockercompose-springboot-mysql-nginx