Docker container connection to gateway refused - php

Question

While setting up a php dev environment with docker, I ran into an issue while setting up remote debugging (XDEBUG) through a dbgp proxy.
Connecting my host machine to the proxy doesn't seem to be a problem, but the proxy container cannot reach my host machine over the port that is configured (in this case 9003)
I'm using docker compose on windows.
Sucessfully connecting my dev machine to the proxy:
INFO: dbgp.proxy: Server:onConnect ('172.18.0.1', 36558) [proxyinit -p 9003 -k XDEBUG_IDEA -m 1 ]
When executing a request containing the right IDE key (e.g. http://localhost/?XDEBUG_SESSION_START=XDEBUG_IDEA), the proxy reacts correctly but is unable to contact the gateway over the port that was registered by my dev machine)
INFO: dbgp.proxy: connection from 172.18.0.2:40902 [<__main__.sessionProxy instance at 0x7fcff1998998>]
ERROR: dbgp.proxy: Unable to connect to the server listener 172.18.0.1:9003 [<__main__.sessionProxy instance at 0x7fcff1998998>]
Traceback (most recent call last):
File "/usr/local/bin/pydbgpproxy", line 223, in startServer
self._server.connect((self._serverAddr[0], self._serverAddr[1]))
File "/usr/lib/python2.7/socket.py", line 224, in meth
return getattr(self._sock,name)(*args)
error: [Errno 111] Connection refused
WARNING: dbgp.proxy: Unable to connect to server with key [XDEBUG_IDEA], stopping request [<__main__.sessionProxy instance at 0x7fcff1998998>]
INFO: dbgp.proxy: session stopped
Any ideas on what is going wrong here?
Firewall issues can be excluded here, since i basically just turned it of.
I did log into the dbgpproxy container and was able to send requests to the gateway ip over ports 80 an 8080, but got the same connection refused when trying port 9003)
Any pointers would be greatly appreciated!
The docker compose file:
version: '2'
volumes:
mysqldata:
driver: local
services:
app:
restart: "always"
image: php:7.0-fpm
command: "true"
volumes:
- .:/var/www/html
nginx:
restart: "always"
build: ./docker/nginx/
ports:
- "80:80"
depends_on:
- php
php:
restart: "always"
build: ./docker/php/
environment:
XDEBUG_CONFIG: remote_host=dbgpproxy
expose:
- "9000"
depends_on:
- mysql
volumes_from:
- app
composer:
restart: "no"
image: composer/composer:php7
command: install
volumes:
- .:/app
dbgpproxy:
restart: "always"
image: christianbladescb/dbgpproxy
expose:
- "9000"
ports:
- "9001:9001"
environment:
DOCKER_HOST: 10.0.75.1
mysql:
image: mysql:latest
volumes:
- mysqldata:/var/lib/mysql
environment:
MYSQL_ROOT_PASSWORD: secret
MYSQL_DATABASE: project
MYSQL_USER: project
MYSQL_PASSWORD: project
phpmyadmin:
image: phpmyadmin/phpmyadmin
ports:
- 8080:80
depends_on:
- mysql
environment:
PMA_HOST: mysql
redis:
image: redis
ports:
- "6379:6379"
mailcatcher:
image: schickling/mailcatcher
restart: "always"
Docker network info:
[
{
"Name": "test_default",
"Id": "8f5b2e1188d65948d6a46977467b181e7fdb4b112a688ff87691b35c29da8970",
"Scope": "local",
"Driver": "bridge",
"EnableIPv6": false,
"IPAM": {
"Driver": "default",
"Options": null,
"Config": [
{
"Subnet": "172.18.0.0/16",
"Gateway": "172.18.0.1"
}
]
},
"Internal": false,
"Containers": {
"05725540eca07666de250f2bb9ae856da69c0c325c4476150f214ba32a9b8714": {
"Name": "test_nginx_1",
"EndpointID": "723a820ea07e77cf976712293a911be3245e862477af6e0ecdcc1462536de6f5",
"MacAddress": "02:42:ac:12:00:08",
"IPv4Address": "172.18.0.8/16",
"IPv6Address": ""
},
"78085ebed911e767a9c006d909cb245e0392055d37550c6cfa3a618969bef821": {
"Name": "test_dbgpproxy_1",
"EndpointID": "2332e1a01a8c0ec7262d96829d7d8f3cb4c711b6e9033ab85a8dfdb57ae01382",
"MacAddress": "02:42:ac:12:00:0a",
"IPv4Address": "172.18.0.10/16",
"IPv6Address": ""
},
"7e12ea0a3a9b90360be6c15222fd052fbf02065aa18b8a3b12d19779bef4b41b": {
"Name": "test_phpmyadmin_1",
"EndpointID": "456a6508b6a507e01584beaf54eec9605db449261749065a562a6fb62111bb9c",
"MacAddress": "02:42:ac:12:00:05",
"IPv4Address": "172.18.0.5/16",
"IPv6Address": ""
},
"81043a642cd9932e16bc51ba4604f6057d82e2c05f6e7378a85adfaa2de87f28": {
"Name": "test_app_1",
"EndpointID": "cfa41a5f210d4907747dcf7d516c6bdaecb817c993867a1e5f8e0250d33c927b",
"MacAddress": "02:42:ac:12:00:03",
"IPv4Address": "172.18.0.3/16",
"IPv6Address": ""
},
"8b0cd7dc33fb783ae811f7ba15decd0165199da66242a10a33d8ee86c41bd664": {
"Name": "test_mailcatcher_1",
"EndpointID": "f2ed38e42dffd9565822a7ac248dcb022a47c8a78b05e93793b62d7188d0823c",
"MacAddress": "02:42:ac:12:00:06",
"IPv4Address": "172.18.0.6/16",
"IPv6Address": ""
},
"d552bf1ab3914220b8fbf9961cc3801acbe180c6e945bd0b4c3bcf8588352a5d": {
"Name": "test_mysql_1",
"EndpointID": "6188cbeb49cf8afc2a7622bd6ef7fc7076ea91b909ec3efc1d9a1ed1d35d5790",
"MacAddress": "02:42:ac:12:00:04",
"IPv4Address": "172.18.0.4/16",
"IPv6Address": ""
},
"ecc941fc337d727e3c118bf9112dee1552ef5db7c94b24706c7d03bc42ea6c0a": {
"Name": "test_redis_1",
"EndpointID": "3f4254982ed1be8354f514dd717993e02b4afdfad8d022f5f8daf0b919a852e1",
"MacAddress": "02:42:ac:12:00:07",
"IPv4Address": "172.18.0.7/16",
"IPv6Address": ""
},
"f15f53405205db7263013fbb1ef1272764ca16850a46097b23d3619cd3d37b20": {
"Name": "test_php_1",
"EndpointID": "5fe30610823cd5660bf62e7612007ff4eef0316cbdfd15dbc0e56cafa6a3aca7",
"MacAddress": "02:42:ac:12:00:02",
"IPv4Address": "172.18.0.2/16",
"IPv6Address": ""
}
},
"Options": {},
"Labels": {}
}
]

Answer 1

That's because pydbgpproxy works similar to XDebug and it is trying to connect to the wrong IP address. The correct IP address pydbgpproxy should connect to is host.docker.internal.
Situation:
xDebug ---> pydbgpproxy -X-> Host
This is because pydbgpproxy received the wrong IP from Docker in the first place.
So I guess you have to hardcode the host.docker.internal IP into pydbgpproxy