Eu tenho o seguinte Dockerfile:

 FROM php:7.0-fpm-alpine

RUN  apk add --update --virtual build_deps gcc g++ autoconf make &&\
  docker-php-source extract &&\
  pecl install xdebug &&\
  echo "zend_extension=$(find /usr/local/lib/php/extensions/ -name xdebug.so)" > /usr/local/etc/php/conf.d/xdebug.ini \
  && echo "xdebug.remote_enable=1" >> /usr/local/etc/php/conf.d/xdebug.ini \
  && echo "xdebug.remote_autostart=0" >> /usr/local/etc/php/conf.d/xdebug.ini &&\
  echo "xdebug.remote_connect_back=1" >> /usr/local/etc/php/conf.d/xdebug.ini &&\
  echo "xdebug.remote_handler = dbgp" >> /usr/local/etc/php/conf.d/xdebug.ini &&\
  echo "xdebug.remote_mode = req" >> /usr/local/etc/php/conf.d/xdebug.ini &&\
  docker-php-ext-enable xdebug &&\
  docker-php-source delete && \
  apk del build_deps && \
  rm -rf /var/cache/apk/* && \
  rm -rf /tmp/*

ENTRYPOINT ["php-fpm"]

E eu corro com o seguintedocker-compose.yml:

version: '2'
services:
  nginx_dev:
    image: nginx:alpine
    ports:
      - "5092:5092"
    links:
      - "my_symfony_www_dev"
    volumes:
      - './conf/nginx/nginx_dev.conf:/etc/nginx/nginx.conf:ro'
      - './logs/dev:/var/logs'
    volumes_from:
      - 'my_symfony_www_dev'

    my_symfony_www_dev:
      build:
        context: .
        dockerfile: Dockerfile_dev
      image: "myimage/my_symfony_app:dev_php"  
      volumes:
        - "$SOURCE_PATH:/var/www/html:Z"
      environment:
        - PHP_IDE_CONFIG= "serverName=my_symfony_www_dev"
        - XDEBUG_CONFIG="remote_host=10.254.254.254,remote_port=9080"
        - PHP_XDEBUG_ENABLED=1

Também como vistolá Eu corro:

sudo ip addr add 10.254.254.254/24 brd + dev enp4s0 label enp4s0:1

E configurou o PhpStorm IDE assim:

Depois, no Firefox, pressiono obotão e no PhpStorm eu pressiono obotão eu definir um ponto de interrupção sobre oapp_dev.php e nada acontece.

Meu sistema escuta pela porta9080 através danetstat -ntlp comando onde o PhpStorm ouve (PhpStorm é um servidor de acordo comessa resposta)

tcp        0      0 0.0.0.0:9080            0.0.0.0:*               LISTEN      4773/java       

Você tem alguma idéia de por que isso acontece e como corrigi-lo?

Editar 1:

ophpinfo() mostra:

Também defini de cocker-compose.yml como:

version: '2'
services:
  nginx_dev:
    image: nginx:alpine
    ports:
      - "5092:5092"
    links:
      - "my_symfony_www_dev"
    volumes:
      - './conf/nginx/nginx_dev.conf:/etc/nginx/nginx.conf:ro'
      - './logs/dev:/var/logs'
    volumes_from:
      - 'my_symfony_www_dev'

    my_symfony_www_dev:
      build:
        context: .
        dockerfile: Dockerfile_dev
      image: "myimage/my_symfony_app:dev_php"  
      volumes:
        - "$SOURCE_PATH:/var/www/html:Z"
      environment:
        - XDEBUG_CONFIG="remote_host=10.254.254.254,remote_port=9080"
        - PHP_XDEBUG_ENABLED=1

E meu dockerfile é:

FROM php:7.0-fpm-alpine

RUN  apk add --update --virtual build_deps gcc g++ autoconf make &&\
  docker-php-source extract &&\
  pecl install xdebug &&\
  echo "zend_extension=$(find /usr/local/lib/php/extensions/ -name xdebug.so)" > /usr/local/etc/php/conf.d/xdebug.ini \
  && echo "xdebug.remote_enable=1" >> /usr/local/etc/php/conf.d/xdebug.ini \
  && echo "xdebug.remote_autostart=0" >> /usr/local/etc/php/conf.d/xdebug.ini &&\
  echo "xdebug.remote_connect_back=0" >> /usr/local/etc/php/conf.d/xdebug.ini &&\
  echo "xdebug.remote_handler = dbgp" >> /usr/local/etc/php/conf.d/xdebug.ini &&\
  echo "xdebug.remote_mode = req" >> /usr/local/etc/php/conf.d/xdebug.ini &&\
  docker-php-ext-enable xdebug &&\
  docker-php-source delete && \
  apk del build_deps && \
  rm -rf /var/cache/apk/* && \
  rm -rf /tmp/*

ENTRYPOINT ["php-fpm"]

Ainda o mesmo resultado.