系统综合实践(三)-Docker compose

第3次实践作业

（1）完成Docker-compose的安装

-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。