php - 为什么我的卷没有复制到其Docker容器中？

Question

我正在尝试使用nginx和运行Laravel应用程序的php-fpm服务器运行Web服务器容器。该目录包含一个前端和后端目录，因此在配置文件中不会关闭我的路径。

我设置了一个docker-compose.yml文件

version: '2'
services:
  webserver:
    build:
      context: ./
      dockerfile: webserver.docker
    volumes:
      - /home/colesam/Documents/code/todo/backend:/var/www
    ports:
      - "8080:80"
    links:
      - backend
  backend:
    build:
      context: ./
      dockerfile: backend.docker
    volumes:
      - ./home/colesam/Documents/code/todo/backend:/var/www

和php-fpm Dockerfile(backend.docker)

FROM php:7.2-fpm

RUN apt-get update -y && apt-get install -y libmcrypt-dev openssl
RUN pecl install mcrypt-1.0.2
RUN docker-php-ext-enable mcrypt
RUN docker-php-ext-install pdo mbstring
RUN apt-get install -y apt-transport-https
RUN apt-get install -y curl
RUN curl -sS https://getcomposer.org/installer | php -- --install-dir=/usr/local/bin --filename=composer
RUN chown -R www-data:www-data /var/www
VOLUME ["/var/www"]
RUN ls -al /var/www
WORKDIR /var/www
RUN composer install

还有Nginx Web服务器Dockerfile(webserver.docker)

FROM nginx:1.10

ADD ./vhost.conf /etc/nginx/conf.d/default.conf
WORKDIR /var/www

由于某种原因，当我运行 docker-compose up -d --build时，我总是在构建过程的这一步失败:

Step 13/13 : RUN composer install
 ---> Running in 65bb97f03004
Do not run Composer as root/super user! See https://getcomposer.org/root for details
Composer could not find a composer.json file in /var/www
To initialize a project, please create a composer.json file as described in the https://getcomposer.org/ "Getting Started" section
ERROR: Service 'backend' failed to build: The command '/bin/sh -c composer install' returned a non-zero code: 1

从输出的最后一行看，它似乎失败了，因为/ var / www /为空，并且没有像 composer.json这样复制文件。我到处看了很多，这个 stackoverflow issue似乎与所发生的事情最相关，但是我认为我已经在关注可接受的答案所建议的所有内容。

即使通过卷装入文件夹，我是否仍需要包括 COPY或 ADD命令？

Answer 1

构建阶段看不到任何已安装的卷。唯一可用于“构建”的是backend.docker和build的compose部分中定义的事物:

    build:
      context: ./
      dockerfile: backend.docker

Do I need to include a COPY or ADD command even though I'm mounting the folder through a volume?

是的，类似这样修改您的 backend.docker

...
WORKDIR /var/www
ADD composer.json .
RUN composer install