151 lines
4.5 KiB
Markdown
151 lines
4.5 KiB
Markdown
# Sample PHP Application for FastCGI Plugin
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This directory contains a sample PHP application that demonstrates the FastCGI plugin functionality with EasyHAProxy.
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## Files
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### index.php
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The main page that displays:
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- PHP version and configuration
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- FastCGI environment variables set by EasyHAProxy
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- How the FastCGI plugin works
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- Links to test pages
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Access: `http://phpapp.local/`
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### info.php
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Standard `phpinfo()` page showing complete PHP configuration.
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Access: `http://phpapp.local/info.php`
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### test-path-info.php
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Demonstrates PATH_INFO support for RESTful URL routing.
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Examples:
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- `http://phpapp.local/test-path-info.php/users`
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- `http://phpapp.local/test-path-info.php/users/123`
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- `http://phpapp.local/test-path-info.php/api/v1/products`
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## FastCGI Environment Variables
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The FastCGI plugin generates an `fcgi-app` configuration that defines these CGI parameters for HAProxy to use:
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| Variable | Description | Example |
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|----------|-------------|---------|
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| `SCRIPT_FILENAME` | Full path to PHP script | `/var/www/html/index.php` |
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| `DOCUMENT_ROOT` | Document root directory | `/var/www/html` |
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| `SCRIPT_NAME` | Script path | `/index.php` |
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| `REQUEST_URI` | Full request URI with query | `/index.php?page=1` |
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| `QUERY_STRING` | Query string parameters | `page=1&limit=10` |
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| `REQUEST_METHOD` | HTTP method | `GET`, `POST`, etc. |
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| `CONTENT_TYPE` | Request content type | `application/json` |
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| `CONTENT_LENGTH` | Request body length | `1024` |
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| `SERVER_NAME` | Virtual host name | `phpapp.local` |
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| `SERVER_PORT` | Server port | `80` or `443` |
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| `HTTPS` | SSL status | `on` or `off` |
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| `PATH_INFO` | Extra path info (optional) | `/users/123` |
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## How It Works
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1. **FastCGI plugin generates configuration** (at startup)
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- Creates an `fcgi-app` section with CGI parameter definitions
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- Includes `docroot`, `index`, and `path-info` settings
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- Adds `use-fcgi-app` directive to the backend
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2. **Request arrives at HAProxy** (port 80)
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- URL: `http://phpapp.local/index.php`
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3. **HAProxy uses the fcgi-app configuration**
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- Sets `SCRIPT_FILENAME` to `/var/www/html/index.php`
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- Sets `DOCUMENT_ROOT` to `/var/www/html`
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- Sets all other CGI variables based on the request
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- Handles directory requests (appends `index.php`)
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4. **HAProxy forwards to PHP-FPM** via FastCGI protocol
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- Host: `php-fpm` (container name)
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- Port: `9000` (TCP) or Unix socket
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- Protocol: `fcgi`
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- Sends CGI parameters in FastCGI format
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5. **PHP-FPM executes the script**
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- Reads the PHP file from `SCRIPT_FILENAME`
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- Processes the PHP code with CGI environment
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- Returns HTML/JSON response
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6. **HAProxy sends response to client**
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## Customizing
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You can customize the FastCGI plugin configuration in `docker-compose-php-fpm.yml`:
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```yaml
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labels:
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# Change document root
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easyhaproxy.http.plugin.fastcgi.document_root: /var/www/public
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# Change default index file
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easyhaproxy.http.plugin.fastcgi.index_file: app.php
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# Disable PATH_INFO
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easyhaproxy.http.plugin.fastcgi.path_info: "false"
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# Add custom FastCGI parameters
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easyhaproxy.http.plugin.fastcgi.custom_params: '{"PHP_VALUE":"memory_limit=256M","APP_ENV":"production"}'
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```
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## Adding Your Own PHP Application
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Replace the contents of this directory with your own PHP application:
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```bash
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# Remove sample files
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rm -rf php-app/*
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# Copy your PHP application
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cp -r /path/to/your/app/* php-app/
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# Restart the stack
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docker compose -f docker-compose-php-fpm.yml restart
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```
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Make sure your application's entry point matches the `index_file` configuration (default: `index.php`).
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## Troubleshooting
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### "File not found" error
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Check that:
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1. The file exists in the `php-app/` directory
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2. The `document_root` matches the container path (`/var/www/html`)
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3. The volume mount is correct in docker-compose.yml
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### PATH_INFO not working
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Ensure `path_info` is enabled in the plugin configuration:
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```yaml
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easyhaproxy.http.plugin.fastcgi.path_info: "true"
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```
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### PHP-FPM connection error
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Verify:
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1. The `localport: 9000` is set correctly
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2. The `proto: fcgi` parameter is set
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3. Both containers are running and can communicate
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View logs:
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```bash
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docker compose -f docker-compose-php-fpm.yml logs php-fpm
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docker compose -f docker-compose-php-fpm.yml logs haproxy
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```
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Check connectivity:
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```bash
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docker compose -f docker-compose-php-fpm.yml exec haproxy ping php-fpm
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```
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## Learn More
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- [FastCGI Plugin Documentation](../../../docs/reference/plugins/fastcgi.md)
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- [Container Labels Reference](../../../docs/reference/container-labels.md)
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- [HAProxy FastCGI Documentation](https://docs.haproxy.org/2.8/configuration.html#5.2-proto)
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