Laravel Dockerfile > 1GB - php

Question

I'm building a Docker Image for my Laravel application but it's getting bigger than 1GB.
This is the Dockerfile:
#
# PHP Dependencies
#
FROM composer as vendor
COPY database/ database/
COPY composer.json composer.json
COPY composer.lock composer.lock
RUN composer install \
--ignore-platform-reqs \
--no-interaction \
--no-plugins \
--no-scripts \
--prefer-dist
#
# Application
#
FROM php:fpm-alpine
RUN apk add --no-cache --virtual .build-deps \
$PHPIZE_DEPS \
curl \
libtool \
libxml2-dev \
&& apk add --no-cache \
curl \
git \
mysql-client \
&& pecl install redis \
&& docker-php-ext-install \
pdo \
pdo_mysql \
tokenizer \
bcmath \
opcache \
xml \
&& apk del -f .build-deps \
&& docker-php-ext-enable \
pdo_mysql \
redis
WORKDIR /var/www/html
COPY . /var/www/html
COPY --from=vendor /app/vendor/ /var/www/html/vendor/
COPY .env.staging /var/www/html/.env
RUN chown -R root:www-data .
EXPOSE 9000
CMD ["php-fpm"]
I use Vue as front-end and Redis as caching provider.
I am used to images around the 200-300 MBs but this is ridiculous.
What can I do to reduce the image size?
Thanks in advance.

Answer 1

Since docker filesystem is OverlayFS, you need a special tool to dive into FS layers.
There are many tools to explore images.
For your case I'd suggest wagoodman/dive: A tool for exploring each layer in a docker image
docker run --rm -it \
-v /var/run/docker.sock:/var/run/docker.sock \
wagoodman/dive:latest \
<image_name|image_id>
A tool for exploring a docker image, layer contents, and discovering ways to shrink your Docker image size.
As you can see on the screenshot - Layers table has Size column.
So, you can find - which layer of your docker image has the greatest contribution to the volume of the final image.