Xdebug for PHP

Using Xdebug for PHP allows developers to debug PHP-processes by connecting interactively.

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To enable Xdebug for PHP please contact our root360 customer service.

Xdebug Usage

When Xdebug is activated, you can connect to your Xdebug sessions by following these steps:

1. On your bastion host, start the program xdebug-helper. This will start an xdebug proxy in the background and print out connection information.

2. Run the printed SSH-command on your local workstation in another shell.

3. Connect your Xdebug client to the debugger:

   • debug-proxy: localhost:9001

   • client-listen-port: use the randomly chosen port printed by xdebug-helper

   • IDE-Key: use one of the keys printed by xdebug-helper. Every role gets its own IDE-Key to allow full control of the debugging process.

Simple example with one role

On bastion host

$ xdebug-helper 

Starting xdebug proxy session (lasts 24h) ...
Access logs by running 'screen -r xdebug-proxy' (leave with <ctrl>+<a>+<d>)

Client-Listen-Port: 20184
Debug-Proxy:        localhost:9001
SSH-Command:        ssh -A -R 20184:localhost:20184 -L 9001:localhost:9001 <bastion-host>
Available IDE-Keys: <ide-key-role1>, <ide-key-role2>

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On local workstation

1. Connect using SSH, specifying client-listen-ports

   Code Block
   language bash
   $ ssh -A -R 20184:localhost:20184 -L 9001:localhost:9001 <bastion-host>

2. In another set of shells you can use dbgpClient to debug each role:

   Code Block
   language bash
   $ curl -LO https://xdebug.org/files/binaries/dbgpClient $ chmod +x dbgpClient # register client with first role $ ./dbgpClient -f -r '<ide-key-role>' -y localhost:9001 -p 20184 proxyinit | success Xdebug Simple DBGp client (0.2)Copyright 2019-2020 by Derick Rethans Waiting for debug server to connect on port 20184.

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$ ./dbgpClient -f -u '<ide-key-role>' -y localhost:9001

Advanded Example with two roles

On bastion host

$ xdebug-helper 

Starting xdebug proxy session (lasts 24h) ...
Access logs by running 'screen -r xdebug-proxy' (leave with <ctrl>+<a>+<d>)

Client-Listen-Port: 20184
Debug-Proxy:        localhost:9001
SSH-Command:        ssh -A -R 20184:localhost:20184 -L 9001:localhost:9001 <bastion-host>
Available IDE-Keys: xdebug-fpm-web, xdebug-fpm-backend, xdebug-fpm-frontend

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On local workstation

1. Connect using SSH specifying two client-listen-ports (you can choose any port you like, e.g. 20184 and 20185 in this example):

   Code Block
   language bash
   $ ssh -A -R 20184:localhost:20184 -R 20185:localhost:20185 -L 9001:localhost:9001 <bastion-host>

2. In another set of shells, you can use dbgpClient to debug each role:

   • connect to role backend:

   Code Block
   language bash
   $ curl -LO https://xdebug.org/files/binaries/dbgpClient $ chmod +x dbgpClient # register client with first role $ ./dbgpClient -f -r 'debug-backend' -y localhost:9001 -p 20184 proxyinit | success Xdebug Simple DBGp client (0.2)Copyright 2019-2020 by Derick Rethans Waiting for debug server to connect on port 20184.

   • connect to role frontend:

   Code Block
   # register client with second role $ ./dbgpClient -f -r 'debug-frontend' -y localhost:9001 -p 20185 proxyinit | success Xdebug Simple DBGp client (0.2)Copyright 2019-2020 by Derick Rethans Waiting for debug server to connect on port 20185.

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$ ./dbgpClient -f -u 'xdebug-backend' -y localhost:9001
$ ./dbgpClient -f -u 'xdebug-frontend' -y localhost:9001

Screencast using PhpStorm (Simple Example)

We have prepared a PhpStorm screencast illustrating how to set up xdebug (download).

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