Connecting to XDEBUG on remote Docker Image - docker

Question

I am trying to debug using NetBeans 11 as my client, Xdebug 3 on the Docker image. The Docker container is on a remote host. I am unable to make a connection. Indicator at the bottom of the NetBeans screen scrolls forever with "waiting for connection (netbeans-xdebug)". I am not sure what I am doing wrong. I have had this work in the past without Docker and with Xdebug 2, I am not sure if I messed up the Xdebug 3, the Docker or both.
My configurations:
Dockerfile adds Xdebug properly and I can see it in my container.
docker-compose.yml
---
services:
drupal:
container_name: intranet-finkenb2
ports:
- "8082:80"
- "9092:9003"
volumes:
- /home/finkenb2/intranet/custom_themes:/opt/drupal/web/themes/custom
- /home/finkenb2/intranet/custom_modules:/opt/drupal/web/modules/custom
environment:
XDEBUG_MODE: debug,develop
XDEBUG_SESSION: netbeans-xdebug
XDEBUG_CONFIG: >
client_host = localhost
client_port = 9003
discover_client_host=true
start_with_request=yes
db:
container_name: intranet-finkenb2-db
solr:
container_name: intranet-finkenb2-solr
ports:
- "8982:8983"
volumes:
public_files:
private_files:
site_settings:
SSH Tunnel via PuTTY: R9092 localhost:9092
NetBeans PHP Debug config:
- Debugger Port: 9092
- Session ID: netbeans-xdebug
- Maximum Data Length: 8192
- Check: Stop at first line
NetBeans Project config (run configuration):
- Run As: Remote Web Site
- Project URL: http://intranet-finkenb2.devel.lib.msu.edu
- index file: index.php
- remote connection
- hostname intranet8.devel.lib.msu.edu /*docker host server*/
- user/pwd correct
- initial directory /var/www/

Answer 1

This is not correct:
ports
- "9092:9003"
Xdebug connects to your IDE, so you don't need to expose the port. These ports are for external exposures anyway, and you're SSH-ing into the container with -R already, so this makes no sense.
This is not correct:
XDEBUG_CONFIG: >
client_host = localhost
client_port = 9003
discover_client_host=true
start_with_request=yes
You can't use all of these as part of the XDEBUG_CONFIG variable, start_with_request, for example.
discover_client_host with Docker doesn't work, as it gets the wrong IP through the gateway
localhost is normally also not correct, as it needs to be the IP/hostname of the machine where your IDE listens. But you're SSH-ing into that container, so that should fine fine.
With that SSH tunnel, you need to set client_port to the port of your remote SSH end point (9092).
If anything else is unclear, make a log file, or try to debug a page with xdebug_info() in it, and it will tell you what Xdebug has tried.