系统综合实践(三)-Docker compose

第3次实践作业

（1）完成Docker-compose的安装

参考资料：Install Docker Compose

-curl -L 

-https://get.daocloud.io/docker/compose/releases/download/1.25.0/docker-compose-`uname -s`-`uname -m` > /usr/local/bin/docker-compose

-sudo chmod +x /usr/local/bin/docker-compose

验收

（2）Dockerfile编写

• dockerfile_nginx

  #基础镜像
  FROM nginx
  #作者信息
  MAINTAINER joey<214253089@qq.com>
  #声明暴露的端口
  EXPOSE 2020
  

• dockerfile_mysql

  #基础镜像
  FROM mysql
  #作者信息
  MAINTAINER joey<214253089@qq.com>
  #设置root密码
  ENV MYSQL_ROOT_PASSWORD 123456
  #设置不可免密登录
  ENV MYSQL_ALLOW_EMPTY_PASSWORD no
  

• dockerfile_php

  #基础镜像
  FROM php:7.4-fpm
  #作者信息
  MAINTAINER joey<214253089@qq.com>
  FROM php:7.4-fpm
  RUN apt-get update && apt-get install -y 
          libfreetype6-dev 
          libjpeg62-turbo-dev 
          libpng-dev 
      && docker-php-ext-install pdo_mysql 
      && docker-php-ext-configure gd --with-freetype --with-jpeg 
      && docker-php-ext-install -j$(nproc) gd
  

• index.html
  it's a godanm html!!!

• index.php
  <?php phpinfo();?>

• default.conf

  server {
      listen       2020;        #修改映射端口
      server_name  localhost;
  
      location / {
          root   /joey/html;     #修改工作目录
          index  index.html index.htm;
      }
  
      error_page   500 502 503 504  /50x.html;
      location = /50x.html {
          root   /usr/share/nginx/html;
      }
  
      location ~ .php$ {
          root           /joey/php;          #修改工作目录
          fastcgi_pass   myphp:9000;        #修改为容器名
          fastcgi_index  index.php;
          fastcgi_param  SCRIPT_FILENAME  $document_root$fastcgi_script_name; 
          include        fastcgi_params;
      }
  }
  

• docker-compose.yml

  version: "3"
  services:
      nginx:
          image: mynginx_image                #指定镜像名
          container_name: mynginx             #指定容器名
          build:
              context: .
              dockerfile: dockerfile_nginx      #指定dockerfile文件
          ports:
              - "80:2020"                       #修改端口映射
          volumes:
              - ./web:/joey/html                  
              - ./default.conf:/etc/nginx/conf.d/default.conf     #配置文件
      php:
          image: myphp_image 
          container_name: myphp 
          build:
              context: .
              dockerfile: dockerfile_php 
          environment:
              MYSQL_PASSWORD: 123456           
          volumes:
              - ./web:/joey/php                
  
      mysql:
          image: mysql_image 
          container_name: mysql
          build:
              context: .
              dockerfile: dockerfile_mysql
          ports:
              - "3306:3306"
          volumes:
              - ./mysql_data:/var/lib/mysql       
  

（3）使用Compose实现多容器运行机制

运行docker-compose

sudo docker-compose up -d --build

查看

sudo docker ps -a

访问

（4）服务测试

• 测试数据库连接

<?php
#需要根据自己的实际情况配置
$servername = "mysql";    
$username = "root";
$password = "123456";     

try {
    $conn = new PDO("mysql:host=$servername", $username, $password);
    echo "连接成功"; 
}
catch(PDOException $e)
{
    echo $e->getMessage();
}
?>

• 数据库新建

下面的代码创建一个名为test的数据库

<?php
$servername = "mysql";
$username = "root";
$password = "123456";

try {
    $conn = new PDO("mysql:host=$servername", $username, $password);

    $conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
    $sql = "CREATE DATABASE test";

    $conn->exec($sql);

    echo "数据库创建成功<br>";
}
catch(PDOException $e)
{
    echo $sql . "<br>" . $e->getMessage();
}
$conn = null;
?>

• 表新建

<?php
$servername = "mysql";
$username = "root";
$password = "123456";
$dbname="test";    

try {
    $conn = new PDO("mysql:host=$servername;dbname=$dbname", $username, $password);
    $conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
    $sql = "CREATE TABLE user (
    id INT(6) UNSIGNED AUTO_INCREMENT PRIMARY KEY, 
    firstname VARCHAR(30) NOT NULL,
    lastname VARCHAR(30) NOT NULL,
    email VARCHAR(50),
    reg_date TIMESTAMP
    )";
    $conn->exec($sql);
    echo "数据表 user 创建成功";
}
catch(PDOException $e)
{
    echo $sql . "<br>" . $e->getMessage();
}
$conn = null;
?>

• 表记录的插入修改

<?php
$servername = "mysql";
$username = "root";
$password = "123456";
$dbname="test";    

try {
    $conn = new PDO("mysql:host=$servername;dbname=$dbname", $username, $password);
    // set the PDO error mode to exception
    $conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);

    $conn->beginTransaction();
    $conn->exec("INSERT INTO user (firstname, lastname, email) 
    VALUES ('ge', 'wuyin', 'a@wuyin.com')");
    $conn->commit();
    echo "新记录插入成功";
}    
catch(PDOException $e)
{
    // 如果执行失败回滚
    $conn->rollback();
    echo $sql . "<br>" . $e->getMessage();
}
$conn = null;
?>

• 删除是否成功

$conn->exec("DELETE FROM user where lastname='wuyin'");

（5）选做

增加一个phpmyadmin容器，实现web端的数据库管理。

• 在docker-compose.yml文件中增加

          phpmyadmin:
              image: myphpmyadmin_image
              container_name: myphpmyadmin
              build: 
                  context: .
                  dockerfile: dockerfile_phpmyadmin
              ports: 
                  - "8080:80" 
              environment:
                  PMA_HOST: mysql                     #指定mysql服务所在的host
  

• dockerfile_phpmyadmin

  #基础镜像
  FROM phpmyadmin/phpmyadmin            
  #作者信息
  MAINTAINER joey<214253089@qq.com>
  #声明暴露的端口
  EXPOSE 8080
  

（6）实验总结

花费时间：3h观看各类docker_compose视频，3h查阅各类文档，1.5h实验（装了30min的compose），1h写blog，半小时来思考为什么挺简单的实验花费了这么多时间，共计8h。

得结论：对web服务端知识不熟悉，盲人摸象，所以以后类似问题应该先把大象装冰箱（雾），自顶向下的学习。