Docker compose of mutiple sub-website - php

Question

I am using Docker compose to run nginx+php+mysql environment,OS is centos 7.2, question is about mutiple sub-website on one host:
For example:
There is one host,two projects will run on this host,
named project-a and project-b,
two different docker-compose.yml exsist in project-a and project-b.
Question:
When executing docker-compose up in project-a and project-b,does nginx+php+mysql environment run two or one? If two, a lot of space is occupied ,how to solve this problem?
Add: docker-compose.yml
version: '2'
services:
nginx:
container_name: nginx
image: nginx
ports:
- 80:80
- 443:443
links:
- php
env_file:
- ./.env
working_dir: /usr/share/nginx/html # should be `/usr/share/nginx/html/project-a` and `/usr/share/nginx/html/project-b` here?
volumes:
- ~/docker/nginx/default.conf:/etc/nginx/conf.d/default.conf
- ~/docker/nginx/nginx.conf:/etc/nginx/nginx.conf
- ~/docker/www:/usr/share/nginx/html
php:
container_name: php
image: fpm
links:
- mariadb
- redis
env_file:
- ./.env
volumes:
- ~/docker/www:/usr/share/nginx/html
mariadb:
container_name: mariadb
image: mariadb
env_file:
- ./.env
volumes:
- ~/opt/data/mysql:/var/lib/mysql
redis:
container_name: redis
image: redis
.env:
project-a and project-bhave different DB_DATABASE and APP_KEY,other items are the same.
APP_ENV=local
APP_DEBUG=true
APP_KEY=aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa # Here different.
DB_HOST=laravel.dev
DB_DATABASE=project-a # Here different.
DB_USERNAME=root
DB_PASSWORD=
CACHE_DRIVER=file
SESSION_DRIVER=file
QUEUE_DRIVER=sync
REDIS_HOST=laravel.dev
REDIS_PASSWORD=null
REDIS_PORT=6379
MAIL_DRIVER=smtp
MAIL_HOST=mailtrap.io
MAIL_PORT=2525
MAIL_USERNAME=null
MAIL_PASSWORD=null
MAIL_ENCRYPTION=null
Project files:
project-a and project-b have the same catalog.
urls:
project-a:aaa.xxxxxx.com
project-b:bbb.xxxxxx.com
Project folders:
project-a:~/docker/www/project-a
project-b:~/docker/www/project-b
Subsidiary question:
1、Should working_dir be /usr/share/nginx/html/project-name or /usr/share/nginx/html in docker-compose.yml file?
2、If working_dir is /usr/share/nginx/html,I think docker-compose.yml files have the same content in project-a and project-b,right?Is there any other items to be modified?
3、How to merge the compose file into one?
Add2:
project-common: docker-compose.yml
version: '2'
services:
nginx:
container_name: nginx
image: nginx
php:
container_name: php
image: fpm
mariadb:
container_name: mariadb
image: mariadb
redis:
container_name: redis
image: redis
project-a: docker-compose.yml,and project-b is the same except project name.
version: '2'
services:
nginx:
external_links:
- project-common:nginx
ports:
- 80:80
- 443:443
links:
- php
env_file:
- ./.env
working_dir: /usr/share/nginx/html/project-a
volumes:
- ~/docker/nginx/default.conf:/etc/nginx/conf.d/default.conf
- ~/docker/nginx/nginx.conf:/etc/nginx/nginx.conf
- ~/docker/www/project-a:/usr/share/nginx/html/project-a
php:
external_links:
- project-common:php
links:
- mariadb
- redis
env_file:
- ./.env
volumes:
- ~/docker/www:/usr/share/nginx/html/project-a
mariadb:
external_links:
- project-common:mariadb
env_file:
- ./.env
volumes:
- ~/opt/data/mysql:/var/lib/mysql
redis:
external_links:
- project-common:redis

Answer 1

You don't need to run nginx and php-fpm in different containers. (if your projects share same php version)
You run fpm as a service and in the same container run nginx in daemon-mode-off.
Then you go to nginx config and setup multiple subdomains.
Then setup data-volumes / shared folders according to your subdomain setup.
So you have single nginx/fpm instance which serves multple projects, and some other database/service containers

Answer 2

I agree with strangeqargo, you need only one container on which you can mount 2 volumes..
If the 2 projects use the same PHP and MariaDB version, just configure them correctly to use different databases but on the same container

Answer 3

Generally, I agree with both strangeqargo and intuix.
However, if you should require isolation between the sites, it would be best to setup separate php-fpm pools and separate users for each site, by have separate definitions in /etc/php5/fpm/pool.d/ with different unix sockets.
Each site definition in nginx should use the corresponding socket of the php-fpm pool.
This gives quite a good explanation on how to do that:
https://www.digitalocean.com/community/tutorials/how-to-host-multiple-websites-securely-with-nginx-and-php-fpm-on-ubuntu-14-04