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Composing Docker Local Development: Xdebug (OSX)

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In this post, we will show the pain points of running Xdebug in a Docker local development environment and how we overcame them.

by
nick.schuch
/ 15 September 2020

Xdebug is essential when it comes to local development.
Normally the hardest part about configuring Xdebug is setting the IP address which it should send its debugging data to (eg. PHPStorm).
Configuring this with Vagrant was very simple since we were able to use the following setting for it to “Just Work”:

xdebug.remote_connect_back = 1
Remote Connect Back is awesome, it allows for Xdebug to send its debugger information back to the IP address making the web request, where PHPStorm is running.
However, running Xdebug with “Docker for Mac” (D4M) is hard. D4M runs over multiple networks:
OSX host
Linux VM
This means that the IP address Xdebug ends up sending data to is the IP address of the Linux VM.
Existing solutions in the Docker community usually end up with the developer running additional configuration that they have to manage:
eg. https://forums.docker.com/t/ip-address-for-xdebug/10460/21
To solve this we wrote a tool called “D4M TCP Forwarder”, which receives requests being sent to a port on the D4M host and forwards them to the OSX users host IP.
https://github.com/nickschuch/d4m-tcp-forwarder
To add this to your project you simply add this service to your Docker Compose file:

xdebug:
image: nickschuch/d4m-tcp-forwarder
network_mode: host
The solution results in:
No configuration for a developer
Reusable solution for the community

Tagged

Docker

Posted by
nick.schuch
Sys Ops Lead

Dated 15 September 2020

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Composing Docker Local Development: Xdebug (OSX)

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