Add WP-CLI container to LEMP stack - docker-compose

Question

Docker version 18.09.1, build 4c52b90
Distributor ID: Ubuntu
Description: Ubuntu 18.04.1 LTS
Release: 18.04
Codename: bionic
I have a working LEMP stack with following docker-compose file.
version: "3.7"
services:
php:
build:
context: './config/php/'
networks:
- dev
volumes:
- /WORK/:/var/www/html/
working_dir: /var/www/html/
container_name: php
nginx:
image: nginx:1.14-alpine
depends_on:
- php
- mysql
networks:
- dev
ports:
- "80:80"
volumes:
- ./config/nginx/nginx.conf:/etc/nginx/conf.d/default.conf:ro
- /WORK/:/var/www/html/
container_name: nginx
mysql:
image: mysql:5.7
restart: always
ports:
- "3306:3306"
volumes:
- /MYSQL/:/var/lib/mysql
networks:
- dev
environment:
MYSQL_ROOT_PASSWORD: "db_root"
MYSQL_DATABASE: "test_db"
MYSQL_USER: "test_db_user"
MYSQL_PASSWORD: "test_db_pass"
container_name: mysql
wpcli:
image: wordpress:cli
depends_on:
- mysql
environment:
WORDPRESS_DB_HOST: mysql
WORDPRESS_DB_NAME: test_db
WORDPRESS_DB_USER: test_db_user
WORDPRESS_DB_PASSWORD: test_db_pass
networks:
- dev
command: '--path=`/var/www/html/WP-Site/`'
volumes:
- /WORK/:/var/www/html/
- /MYSQL/:/var/lib/mysql
working_dir: /var/www/html/
container_name: wpcli
networks:
dev:
The Dockerfile for the PHP image contains this.
FROM php:7.2-fpm-alpine
# docker-entrypoint.sh dependencies
RUN apk add --no-cache \
# in theory, docker-entrypoint.sh is POSIX-compliant, but priority is a working, consistent image
bash \
# BusyBox sed is not sufficient for some of our sed expressions
sed
# https://github.com/docker-library/wordpress/blob/master/php7.3/fpm-alpine/Dockerfile
# install the PHP extensions we need
RUN set -ex; \
\
apk add --no-cache --virtual .build-deps \
libjpeg-turbo-dev \
libpng-dev \
libzip-dev \
; \
\
docker-php-ext-configure gd --with-png-dir=/usr --with-jpeg-dir=/usr; \
docker-php-ext-install gd mysqli opcache zip; \
\
runDeps="$( \
scanelf --needed --nobanner --format '%n#p' --recursive /usr/local/lib/php/extensions \
| tr ',' '\n' \
| sort -u \
| awk 'system("[ -e /usr/local/lib/" $1 " ]") == 0 { next } { print "so:" $1 }' \
)"; \
apk add --virtual .wordpress-phpexts-rundeps $runDeps; \
apk del .build-deps
The NGINX conf is this.
upstream php {
server php:9000;
}
server {
listen 80;
server_name localhost;
## Your only path reference.
root /var/www/html;
## This should be in your http block and if it is, it's not needed here.
index index.php index.html index.htm;
location = /favicon.ico {
log_not_found off;
access_log off;
}
location = /robots.txt {
allow all;
log_not_found off;
access_log off;
}
location / {
# https://nginxlibrary.com/enable-directory-listing/
autoindex on;
# This is cool because no php is touched for static content.
# include the "?$args" part so non-default permalinks doesn't break when using query string
try_files $uri $uri/ /index.php?$args;
}
location ~ \.php$ {
#NOTE: You should have "cgi.fix_pathinfo = 0;" in php.ini
include fastcgi.conf;
fastcgi_intercept_errors on;
fastcgi_pass php;
}
location ~* \.(js|css|png|jpg|jpeg|gif|ico)$ {
expires max;
log_not_found off;
}
}
All services except WP-CLI work. My folder structure is so that under the main WORK folder I have subfolders, each with a project in them.
Such projects can be WordPress but can also be using another CMS or just be small static sites.
Under http://localhost/ I see an overview of the WORK folder with all the subfolders. Clicking on any project folder, e.g. WP-Site, will lead me to e.g. http://localhost/WP-Site/. There I have a working WordPress install that connects to the PHP and MYSQL services just fine.
But when trying to use WP-CLI it either tells me that it cannot find a working WordPress install and when I pass the command in the service and give it the path of one of the WordPress projects I have it will just exit without error message.
Do I really need a WordPress image to be able to use the WP-CLI image. In the WP-CLI service I also gave the same environment variables as for the MYSQL service, so that WP-CLI can know where to connect to.
If there is any way to run a WP-CLI container and have that available under the main WORK folder, so for all projects I might make, well that would be great.
I thought of installing everything into one image but then this defeats the purpose of Docker, to be able to have things separate and exchangeable. So I like to be able to make a WP-CLI container that indeed is able to connect to my PHP and MYSQL containers.