Using composer with wordpress in docker - wordpress

Question

I'm try to setup a docker workspace with Alpine, PHP, Apache, MySQL and Composer.
Currently I'm trying to use the following images:
PHP, Alpine and Composer: https://hub.docker.com/r/petehouston/docker-alpine-php-composer/
Wordpress: https://hub.docker.com/_/wordpress/
I created a docker-compose.yml file to manage this dependencies for me.
docker-compose.yml
version: '2'
services:
db:
image: mysql:5.7
volumes:
- ./db:/var/lib/mysql
restart: always
environment:
MYSQL_ROOT_PASSWORD: wordpress
MYSQL_DATABASE: wordpress
MYSQL_USER: wordpress
MYSQL_PASSWORD: wordpress
wordpress:
depends_on:
- db
image: wordpress:latest
volumes:
- ./www:/var/www/html
links:
- db
ports:
- "8000:80"
restart: always
environment:
WORDPRESS_DB_HOST: db:3306
WORDPRESS_DB_PASSWORD: wordpress
alpine:
image: petehouston/docker-alpine-php-composer:latest
links:
- wordpress
So my problem is I'm trying to use the composer of the alpine container to manager my Wordpress in the wordpress container but when i try to use the following command:
docker run --rm -v $(pwd):/www -w /wordpress/var/www/html composer/composer create-project roots/sage your-theme-name 8.5.0
nothing happens, and the alpine container doesn't stay up, after i run compose-docker.up he exits

Answer 1

You can't access to Wordpress container from Alpine container using -w /wordpress/var/www/html.
As far as I understand, image petehouston/docker-alpine-php-composer:latest provides PHP deployment environment. That means you should use this image instead of wordpress image.
Your compose file can be like
version: '2'
services:
db:
image: mysql:5.7
volumes:
- ./db:/var/lib/mysql
restart: always
environment:
MYSQL_ROOT_PASSWORD: wordpress
MYSQL_DATABASE: wordpress
MYSQL_USER: wordpress
MYSQL_PASSWORD: wordpress
alpine:
image: petehouston/docker-alpine-php-composer:latest
volumes:
- ./www:/home
links:
- db
ports:
- "8000:80"
command: composer require phpunit/phpunit
restart: always
Plz give me feedback. I'm sorry because i can't comment to get more information from you. Should you still get errors, comment here. I'll recheck