Reverse proxy phpmyadmin through apache with a PHP container - php

Question

I'm trying to setup a docker environment with the the following containers: apache, php, mysql, phpmyadmin.
I have a problem making both phpmyadmin and my applications work at the same time, and I was wondering if it wasn't because I use a PHP container to run my PHP instead of phpmyadmin that also have PHP installed.
I understood that phpmyadmin runs with PHP (hence the name), though I was wondering if it was possible to have a docker image without PHP and then to proxy the requests to php files from phpmyadmin to the php container.
I've already established a reverse proxy from apache to phpmyadmin because I don't need phpmyadmin to run it's own apache server, and I would like to do the same with PHP.
I tried to proxy php requests from apache to my php container, but I doesn't work.
Here is my full compose.yaml
version: '3.8'
services:
php:
build:
context: './php/'
args:
- PHP_VERSION=${PHP_VERSION}
volumes:
- "${APPS_VOLUME:-apps}:/var/www/html/"
networks:
- backend
restart: unless-stopped
stdin_open: true
tty: true
container_name: php
apache:
build:
context: './apache/'
args:
- APACHE_VERSION=${APACHE_VERSION}
ports:
- '${APACHE_PORT:-8000}:80'
volumes:
- "${APPS_VOLUME:-apps}:/usr/local/apache2/htdocs/"
- "pma:/usr/local/apache2/htdocs/phpmyadmin/"
networks:
- frontend
- backend
depends_on:
- php
- mysql
working_dir: /usr/local/apache2/htdocs/
restart: unless-stopped
container_name: apache
mysql:
image: mysql:${MYSQL_VERSION}
ports:
- '${MYSQL_PORT:-3307}:3306'
volumes:
- "db-data:/var/lib/mysql"
networks:
- backend
environment:
- MYSQL_ROOT_PASSWORD=${MYSQL_ROOT_PASSWORD}
- MYSQL_USER=${MYSQL_USER}
- MYSQL_PASSWORD=${MYSQL_PASSWORD}
command: --federated
working_dir: /usr/
restart: unless-stopped
container_name: mysql
phpmyadmin:
image: phpmyadmin:${PHPMYADMIN_VERSION:-latest}
volumes:
- "pma:/var/www/html/"
networks:
- backend
environment:
- PMA_HOST=mysql
- PMA_ABSOLUTE_URI=http://localhost:${APACHE_PORT:-8000}/phpMyAdmin/
restart: unless-stopped
container_name: phpmyadmin
volumes:
apps:
name: apps
db-data:
name: db-data
pma:
name: pma
networks:
frontend:
name: frontend
backend:
name: backend
And my apache conf
ServerName localhost
LoadModule rewrite_module modules/mod_rewrite.so
LoadModule ssl_module modules/mod_ssl.so
LoadModule deflate_module /usr/local/apache2/modules/mod_deflate.so
LoadModule proxy_module /usr/local/apache2/modules/mod_proxy.so
LoadModule proxy_fcgi_module /usr/local/apache2/modules/mod_proxy_fcgi.so
<VirtualHost *:80>
# Proxy .php requests to port 9000 of the php-fpm container
#ProxyPassMatch ^/(.*\.php(/.*)?)$ fcgi://php:9000/var/www/html/$1
<FilesMatch \.php$>
SetHandler "proxy:fcgi://php:9000/var/www/html/"
</FilesMatch>
DocumentRoot /usr/local/apache2/htdocs/
<Directory /usr/local/apache2/htdocs/>
DirectoryIndex index.php
Options Indexes FollowSymLinks
AllowOverride All
Require all granted
</Directory>
# Proxy phpmyadmin request to port 80 of the phpmyadmin container
ProxyPass "/phpMyAdmin/" "http://phpmyadmin/"
ProxyPassReverse /phpMyAdmin/ http://phpmyadmin/
# Send apache logs to stdout and stderr
CustomLog /proc/self/fd/1 common
ErrorLog /proc/self/fd/2
</VirtualHost>
Is my configuration wrong? Do I have to use the phpmyadmin container to handle PHP requests or is there a way to separate them?
Thanks
Edit: Changed the title of the issue after Nigel Ren observation
I seem to have found a solution, I don't know if it is how I'm supposed to do but I can now use the phpmyadmin interface and open my apps. There's still some problems with both of them, but I'm not sure if it have anything to do with the apache configuration
I used the fpm-alpine image of phpmyadmin instead of the normal one and changed my conf file like so:
ServerName localhost
LoadModule rewrite_module modules/mod_rewrite.so
LoadModule ssl_module modules/mod_ssl.so
LoadModule deflate_module /usr/local/apache2/modules/mod_deflate.so
LoadModule proxy_module /usr/local/apache2/modules/mod_proxy.so
LoadModule proxy_fcgi_module /usr/local/apache2/modules/mod_proxy_fcgi.so
LoadModule proxy_http_module /usr/local/apache2/modules/mod_proxy_http.so
<VirtualHost *:80>
# Proxy phpmyadmin request to the phpmyadmin container
ProxyPassMatch ^/phpMyAdmin/(.*\.php(/.*)?)$ fcgi://phpmyadmin:9000/var/www/html/$1
ProxyPassReverse /phpMyAdmin/ fcgi://phpmyadmin:9000/var/www/html/
# Proxy .php requests to port 9000 of the php-fpm container
ProxyPassMatch ^/(.*\.php(/.*)?)$ fcgi://php:9000/var/www/html/$1
ProxyPassReverse / fcgi://php:9000/var/www/html/$1
DocumentRoot /usr/local/apache2/htdocs/
<Directory /usr/local/apache2/htdocs/>
DirectoryIndex index.php
Options Indexes FollowSymLinks
AllowOverride All
Require all granted
</Directory>
# Send apache logs to stdout and stderr
CustomLog /proc/self/fd/1 common
ErrorLog /proc/self/fd/2
</VirtualHost>
I'm not sure the ProxyPassReverse are required as I seem to have the same result without them.
I just realized that phpmyadmin is simply an app. The docker image just provides you the latest version along with an environment to make it ready to use, but you can really just copy the source files into your apps directory and parse the php files with your php container like you do for any other app.
So to answer one of my first questions, you don't need to have both containers because you don't even need the phpmyadmin image.
I feel stupid.
Hope it helps someone so I can at least feel like it was not all in vain.