文档结构

.
├── docker-compose.yml
├── mysql
│   └── Dockerfile
├── nginx
│   ├── conf
│   │   └── default.conf
│   └── Dockerfile
├── php
│   └── Dockerfile
└── www
    ├── 1.txt
    └── test.php

docker-compose.yml

version: '2'
services:
  nginx:
    image: nginx:1
    ports:
      - "80:80"
    links:
      - phptest
    volumes:
      - /opt/nginx/conf/default.conf:/etc/nginx/conf.d/default.conf
      - /opt/www:/var/www

  phptest:
    image: php:7.2.10-fpm
    container_name: phptest
    ports:
      - "9000:9000"
    privileged: true    
    volumes:
      - /opt/www:/var/www/html
    depends_on:
      - "mysql"

  mysql:
    image: mysql:5.7
    ports:
      - "3306:3306"
    environment:
      MYSQL_ROOT_PASSWORD: 123456

nginx

default.conf

upstream phpupstream {
        server phptest:9000 fail_timeout=5s max_fails=5;
    }
server {
    listen 80;
    server_name localhost;

    location / {
        root /var/www; # 代码目录
        index index.html index.htm index.php; # 增加index.php
    }
    #error_page 404 /404.html;

    # redirect server error pages to the static page /50x.html
    #
    error_page 500 502 503 504 /50x.html;
    location = /50x.html {
        root /var/www/html;
    }
    location ~ \.php$ {
        root /var/www/html/; # 代码目录
        fastcgi_pass phpupstream; # 修改为php容器(compose文件中nginx段设置的links的php名称)
        fastcgi_index index.php;
        fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name; # 修改为$document_root
        include fastcgi_params;
    }
}

解决问题

mysql 报错 没有想过函数

// 进入容器
docker exec -it php-container-name /bin/bash
// 切换目录
cd /usr/local/bin 
// 安装pdo_mysql扩展
./docker-php-ext-install pdo_mysql  
//  安装mysqli扩展
./docker-php-ext-install mysqli
// 退出容器
exit
// 重启容器
docker restart php-container-name