Can't connect PhpStorm with xdebug with Docker

Question

I have the following 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"]

And I run it with the following docker-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

Also as seen there I run:

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

And configured the PhpStorm IDE like that:

Then in Firefox I press the button and in PhpStorm I press the button I set a breakpoint over the app_dev.php and nothing happens.

My system listens over the port 9080 via netstat -ntlp command where the PhpStorm listens to (PhpStorm is a server according to that answer).

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

Do you have any idea on why that happens and how to fix it?

Edit 1:

The phpinfo() shows:

I've also set de cocker-compose.yml as:

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

And my dockerfile is:

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"]

Still Same result.

1) Collect phpinfo() output captured via browser (as you are trying to debug a web page) -- top header table + xdebug specific section. This is to confirm currently applied/active settings; 2) Enable and collect xdebug logs for such unsuccessful debug session; 3) You have xdebug.remote_connect_back=1 in your Dockerfile -- with this option xdebug ignores value of xdebug.remote_host. So far it must be wrong IP issue -- xdebug must be trying to connect but to the wrong IP (could be because of #3 for example) — LazyOne
– LazyOne, Commented Nov 14, 2017 at 12:17
4) You have specified serverName=my_symfony_www_dev. In such case Host field in PHP | Servers should also be using it -- that's how PhpStorm identifies what Server entry to use. — LazyOne
– LazyOne, Commented Nov 14, 2017 at 12:20
1) Do not silently update the post -- nobody gets notified about that. 2) Where is xdebug log? 3) Your screenshot of xdebug info shows that your XDEBUG_CONFIG from docker_compose file is not getting applied, at very least in a way you were expecting it to be (port and remote_host are still using defaults). — LazyOne
– LazyOne, Commented Nov 14, 2017 at 15:45
Instead of using a breakpoint inside phpstorm, you can also use this function in your code xdebug_break();. If this triggers the debug function in phpstorm, there is probably something wrong with your path mapping — veelen
– veelen, Commented Nov 15, 2017 at 13:27

Dimitrios Desyllas · Accepted Answer · 2017-11-23 08:06:41Z

In the end I had to do put the following over my Dockerfile:

FROM php:7.0-fpm-alpine

VOLUME /var/log/xdebug

ARG XDEBUG_HOST="172.17.0.1"
ARG XDEBUG_PORT=9021

RUN  apk add --update --virtual build_deps gcc g++ autoconf make &&\
  docker-php-source extract &&\
  pecl install xdebug &&\
  docker-php-ext-enable xdebug &&\
  && 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 &&\
  echo "xdebug.remote_host=${XDEBUG_HOST}" >> /usr/local/etc/php/conf.d/docker-php-ext-xdebug.ini &&\
  echo "xdebug.remote_port=${XDEBUG_PORT}" >> /usr/local/etc/php/conf.d/docker-php-ext-xdebug.ini &&\
  docker-php-source delete && \
  apk del build_deps && \
  rm -rf /var/cache/apk/* && \
  rm -rf /tmp/*

ENTRYPOINT ["php-fpm"]

The XDEBUG_HOST build arg contains the ip of docker0 network interface over GNU/Linux systems (use ifconfig to find out).

And over my docker-compose.yml I provide the following:

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
        args:
          XDEBUG_HOST: 172.17.0.1
          XDEBUG_PORT: 9021
      image: "myimage/my_symfony_app:dev_php"  
      volumes:
        - "$SOURCE_PATH:/var/www/html:Z"

Over the ./conf/nginx/nginx_dev.conf mapped over the volume I put the following setting on server section:

server_name 0.0.0.0;

Then on phpstorm use the following settings:

Then you are good to go!

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Can't connect PhpStorm with xdebug with Docker

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