How to correctly link php-fpm and Nginx Docker containers?

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I know it is kind an old post, but I’ve had the same problem and couldn’t understand why your code didn’t work.
After a LOT of tests I’ve found out why.

It seems like fpm receives the full path from nginx and tries to find the files in the fpm container, so it must be the exactly the same as server.root in the nginx config, even if it doesn’t exist in the nginx container.

To demonstrate:

docker-compose.yml

nginx:
    build: .
    ports:
        - "80:80"
    links:
        - fpm
fpm:
    image: php:fpm
    ports:
        - ":9000"

    # seems like fpm receives the full path from nginx
    # and tries to find the files in this dock, so it must
    # be the same as nginx.root
    volumes:
        - ./:/complex/path/to/files/

/etc/nginx/conf.d/default.conf

server {
    listen  80;

    # this path MUST be exactly as docker-compose.fpm.volumes,
    # even if it doesn't exist in this dock.
    root /complex/path/to/files;

    location / {
        try_files $uri /index.php$is_args$args;
    }

    location ~ ^/.+\.php(/|$) {
        fastcgi_pass fpm:9000;
        include fastcgi_params;
        fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
    }
}

Dockerfile

FROM nginx:latest
COPY ./default.conf /etc/nginx/conf.d/

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