Docker容器中Composer搭配hirak/prestissimo并行安装失效问题

Let's figure out why the parallel installation feature of hirak/prestissimo isn't working for you in your Docker setup. I've reviewed your Dockerfile and docker-compose.yml, and here are the most likely causes along with actionable fixes:

First, Let's Recap Your Setup #

Your Dockerfile builds an Ubuntu 16.04 image with PHP 7.1, installs Composer globally, adds the prestissimo plugin, and sets up Supervisor. Your docker-compose.yml mounts your local code to /app in the container.

Possible Issues & Fixes #

1. Prestissimo is Installed for Root, But Not Accessible When Running Composer #

All RUN commands in your Dockerfile run as root, so prestissimo gets installed in root's Composer home directory (/root/.composer). If you later run composer install as a non-root user (or even root without the correct environment variable), Composer might not pick up the global plugin.

Fix:
Add an environment variable to explicitly set the Composer home directory in your Dockerfile, so Composer always looks for global plugins in the right place:

# Add this after installing Composer
ENV COMPOSER_HOME /root/.composer

2. Prestissimo Version Incompatibility with PHP 7.1 #

Newer versions of prestissimo drop support for PHP 7.1 (they require PHP 7.2+). The latest version you're installing likely isn't compatible with your PHP 7.1 setup.

Fix:
Install a compatible older version of prestissimo that supports PHP 7.1. Modify your global install command in the Dockerfile:

RUN composer --no-interaction global require 'hirak/prestissimo:^0.3.10'

Version 0.3.10 is the last release that works with PHP 7.1, per the package's compatibility constraints.

3. Prestissimo Didn't Install Successfully (Silent Failure) #

The --no-interaction flag might be hiding installation errors. If prestissimo failed to install for some reason (like missing extensions), it won't work, but you won't see an error.

Fix:
Temporarily remove the --no-interaction flag when installing prestissimo to check for errors:

RUN composer global require 'hirak/prestissimo:^0.3.10'

After confirming the install works, you can add the flag back. You can also verify the plugin is installed by running this inside the container:

composer global show

You should see hirak/prestissimo listed in the output.

4. Volume Mounting Might Be Interfering #

When you mount your local ./ directory to /app, your local composer.json or vendor folder could be overriding container settings. Also, make sure you're running composer install inside the container, not on your host machine.

Fix:
Run the command directly in the container using docker-compose:

docker-compose exec php71 composer install

Avoid mounting a local .composer directory into the container, as it will overwrite the root's Composer config where prestissimo is installed.

Updated Dockerfile Example #

Here's your Dockerfile modified to address the key issues:

FROM ubuntu:16.04 
RUN apt-get update && apt-get install -y software-properties-common \
 && LC_ALL=C.UTF-8 add-apt-repository ppa:ondrej/php \
 && apt-get update \
 && apt-get install -y php7.1 git vim supervisor curl unzip mysql-client wget \
 && apt-get install -y --no-install-recommends php7.1-cli php7.1-dev \
 php7.1-pgsql php7.1-sqlite3 php7.1-gd \
 php7.1-curl php7.1-memcached \
 php7.1-imap php7.1-mysql php7.1-mbstring \
 php7.1-xml php7.1-imagick php7.1-zip php7.1-bcmath php7.1-soap \
 php7.1-intl php7.1-readline php7.1-mcrypt php7.1-fpm 
RUN curl -sS https://getcomposer.org/installer | php && mv composer.phar /usr/local/bin/composer 
# Set Composer home to ensure global plugins are detected
ENV COMPOSER_HOME /root/.composer
# Install PHP 7.1-compatible version of prestissimo
RUN composer --no-interaction global require 'hirak/prestissimo:^0.3.10' 
COPY docker/config/ /config/ 
RUN cp /config/supervisord.conf /etc/supervisor/supervisord.conf 
WORKDIR /app 
EXPOSE 9000 
ENTRYPOINT ["/config/entrypoint.sh"]

Rebuild your image with this updated Dockerfile, then run composer install inside the container. You should see output indicating prestissimo is downloading packages in parallel.

内容的提问来源于stack exchange，提问作者artstyle