Docker Compose+nginx實現負載均衡

時間 2019-11-30

標籤 docker compose+nginx compose nginx 實現負載均衡欄目 Docker 简体版

原文原文鏈接

Docker 是一個開源的應用容器引擎，讓開發者能夠打包他們的應用以及依賴包到一個可移植的容器中，而後發佈到任何流行的 Linux 機器上，也能夠實現虛擬化。容器是徹底使用沙箱機制，相互之間不會有任何接口。php

前言

本篇文章引導你使用Docker Compose在Docker容器中運行nginx和兩個簡單的Spring Boot應用程序，從而實現負載均衡。關於Docker 入門請參考純潔的微笑Docker 系列文章html

準備

Docker CE

https://user-gold-cdn.xitu.io/2018/3/31/1627b7b3cc2bdbb9?w=676&h=125&f=png&s=3317

技術棧

Docker
Spring Boot
NGINX
Maven

目錄結構

https://user-gold-cdn.xitu.io/2018/3/31/1627b7b3c70cac33?w=846&h=724&f=png&s=116572

Spring Boot應用程序

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<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">
    <parent>
       <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.0.RELEASE</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>docker-compose-springboot-nginx</artifactId>

    <dependencies>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-freemarker</artifactId>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>
</project>
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DockerController

package cn.merryyou.docker.controller;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;

/** * Created on 2018/3/20 0020. * * @author zlf * @email i@merryyou.cn * @since 1.0 */
@Controller
public class DockerController {

    @GetMapping("/")
    public String docker() {
        return "docker";
    }
}

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DockerApplication

package cn.merryyou.docker;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

/** * Created on 2018/3/20 0020. * * @author zlf * @email i@merryyou.cn * @since 1.0 */
@SpringBootApplication
public class DockerApplication {
    public static void main(String[] args) {
        SpringApplication.run(DockerApplication.class, args);
    }
}


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docker.ftl

<h1>Hello Spring Boot with docker-compose!</h1>
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application.yml

spring:
 freemarker:
 template-loader-path: classpath:/templates
 request-context-attribute: .ftl
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Dockerfile

FROM hub.c.163.com/wuxukun/maven-aliyun:3-jdk-8
ADD ["app-1.jar", "app.jar"]
EXPOSE 8080
ENTRYPOINT ["java","-jar","/app.jar"]
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nginx.conf

upstream app {
    server app-1:8080;
    server 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;
    }
}
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docker-compose.yaml

version: '2'
services:
 nginx:
 container_name: some-nginx
 image: nginx:1.13
 restart: always
 ports:
 - 80:80
# - 443:443
 volumes:
 - ./nginx/conf.d:/etc/nginx/conf.d
 app-1:
 restart: always
 build: ./app/docker-app-1
 working_dir: /app
 volumes:
 - ./app:/app
 expose:
 - "8080"
# command: mvn clean spring-boot:run
 depends_on:
 - nginx
 app-2:
 restart: always
 build: ./app/docker-app-2
 working_dir: /app
 volumes:
 - ./app:/app
 expose:
 - "8080"
# command: mvn clean spring-boot:run
 depends_on:
 - nginx
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version: '2'：表示使用第二代語法來構建 docker-compose.yaml 文件；
services: 用來表示 compose 須要啓動的服務，咱們能夠看出此文件中有三個服務分別爲：nginx、app-一、app-2。
container_name:容器名稱
ports:表示對外開放的端口
restart: always:表示若是服務啓動不成功會一直嘗試。
volumes:加載本地目錄下的配置文件到容器目標地址下