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In my Docker/docker-compose based Symfony project I have the following directory structure:

.
├── docker-compose.yml
└── server
    ├── app
    │   ├── .bash_history
    │   ├── bin
    │   ├── .composer
    │   ├── composer.json
    │   ├── composer.lock
    │   ├── config
    │   ├── .dockerignore
    │   ├── .env
    │   ├── .env.local
    │   ├── .env.test
    │   ├── .gitignore
    │   ├── phpunit.xml.dist
    │   ├── public
    │   ├── README.md
    │   ├── src
    │   ├── symfony.lock
    │   ├── templates
    │   ├── tests
    │   ├── translations
    │   ├── uploads
    │   ├── var
    │   └── vendor
    ├── .bash_history
    ├── .composer
    ├── Dockerfile
    └── .env.dev.local

My docker-compose.yml looks like:

version: '3'

services:
  php:
    build:
      context: server
      args:
        - USER_ID=1000
    ports:
      - 8001:8000
    volumes:
      - ./server/app:/var/www
      - composerCache:/var/www/.composer
      - composerVendor:/var/www/vendor
volumes:
  composerCache:
  composerVendor:

And here is the Dockerfile:

FROM php:7.3.16-cli-buster

RUN apt-get update && apt-get install -y --no-install-recommends libbz2-dev libenchant-dev libpng-dev libldap2-dev libgmp-dev libc-client-dev libkrb5-dev libicu-dev \
    libmcrypt-dev libxml2-dev libmagickwand-dev libzip-dev

RUN docker-php-ext-configure ldap --with-libdir=lib/x86_64-linux-gnu/ && \
    docker-php-ext-configure imap --with-kerberos --with-imap-ssl && \
    docker-php-ext-install ldap mysqli pdo_mysql bcmath bz2 calendar exif zip intl gmp soap gd dom imap sockets

RUN pecl install imagick xdebug-2.9.0 && docker-php-ext-enable imagick xdebug

# Install Composer
RUN curl -sS https://getcomposer.org/installer | php -- --install-dir=/usr/local/bin --filename=composer

COPY ./app .

# Copy Symfony .env.local override
COPY .env.dev.local .

RUN composer install

ARG USER_ID=1000
# Switch local user to be www-data user
RUN usermod -u ${USER_ID} www-data && groupmod -g ${USER_ID} www-data

WORKDIR /var/www

RUN chown -R www-data:www-data /var/www

USER www-data

CMD ["php", "bin/console", "server:run", "*:8000"]

After building image and running docker-compose up -d I get the following error:

php_1  | Warning: require(/var/www/vendor/autoload.php): failed to open stream: No such file or directory in /var/www/bin/console on line 11

I ran docker-compose run php bash to inspect the container and confirmed that the vendor director is empty and owned by root.

The volume composerVendor:/var/www/vendor is meant to keep the vendor directory from being overwritten by the outer bind mount. For some reason instead it is empty.

I have a nearly identical setup with a Node container with the node_modules directory and in that case it works perfectly.

Any ideas?

Answers

You have RUN composer install inside Dockerfile this will result to static image. After that you map composerVendor volume when using that docker image, The composerVendor was empty and just overrides your /var/www/vendor/... when you start docker, So that is your failed case.

Solution: If you really need to use composerVendor You need to run composer install every time when up docker eg. run composer install via command in docker-compose file or in your entry-point script.

EDIT After look at in Dockerfile again i see when you COPY ./app . and RUN composer install you are not working on /var/www/ may be on /var/www/html (thinks this is default from base image) and solution is you need to create /var/www and do what you want inside /var/www