Why caddy + php-fpm configuration in docker-compose doesn't work? - php

Question

I'm trying to set up a development environment on my local machine which consists of caddy + PHP.
docker-compose.yaml:
version: '3'
services:
app:
build:
context: .
container_name: app
restart: unless-stopped
tty: true
environment:
SERVICE_NAME: app
SERVICE_TAGS: dev
volumes:
- ./:/var/www
- ./docker/php/local.ini:/usr/local/etc/php/conf.d/local.ini
webserver:
image: caddy
container_name: webserver
restart: unless-stopped
tty: true
ports:
- "80:80"
- "443:443"
volumes:
- ./:/srv
- ./docker/caddy/Caddyfile/:/etc/caddy/Caddyfile
db:
image: mysql:8.0
container_name: db
restart: unless-stopped
tty: true
ports:
- "3306:3306"
environment:
MYSQL_USER: pingr
MYSQL_DB: pingr
MYSQL_PASSWORD: pingr
MYSQL_RANDOM_ROOT_PASSWORD: 'yes'
volumes:
- dbdata:/var/lib/mysql
volumes:
dbdata:
driver: local
Dockerfile for app service:
FROM php:7.4-fpm
# Copy composer.lock and composer.json
COPY composer.lock composer.json /var/www/
# Set working directory
WORKDIR /var/www
# Install dependencies
RUN apt-get update && apt-get install -y \
build-essential \
libpng-dev \
libjpeg62-turbo-dev \
libfreetype6-dev \
locales \
zip \
jpegoptim optipng pngquant gifsicle \
vim \
unzip \
git \
curl \
libzip-dev \
libicu-dev
# Clear cache
RUN apt-get clean && rm -rf /var/lib/apt/lists/*
# Install extensions
RUN docker-php-ext-install pdo_mysql zip exif pcntl intl
RUN docker-php-ext-configure gd --with-freetype --with-jpeg
RUN docker-php-ext-install gd
# Install composer
RUN curl -sS https://getcomposer.org/installer | php -- --install-dir=/usr/local/bin --filename=composer
# Add user for laravel application
RUN groupadd -g 1000 www
RUN useradd -u 1000 -ms /bin/bash -g www www
# Copy existing application directory contents
COPY . /var/www
# Copy existing application directory permissions
COPY --chown=www:www . /var/www
# Change current user to www
USER www
# Expose port 9000 and start php-fpm server
EXPOSE 9000
CMD ["php-fpm"]
Caddyfile:
:80 {
root * /srv/public
php_fastcgi app:9000
file_server /uploads/*
encode gzip zstd
}
This results in "File not found" when I open http://localhost.
I'm 100% sure that the problem is because root in caddyfile and volumes in app and webserver serivces are different.
When I make them the same, looks like it works. Moreover, it even doesn't matter which path I choose, I can have /var/bar for example.
But then I don't understand how it works.
In caddy image they say that the working directory is /srv. So as I get it, this is where site files should be placed.
In the Caddyfile I specify that Caddy should look at /srb/public (because I use Laravel)..
In the php-fpm image, they say that the working directory is /var/www. Which means that.. I'm not sure what does it mean. If I don't use Docker, then in my local machine I'd have caddy + php, only caddy "knows" where the source .php files are located. In case the requests asks for a .php file Caddy proxies it to php. Maybe I don't need a volume here at all?