Slides used during Magento User Group Den Bosch, dealing with Magento debugging - tools, extensions and tips on how to troubleshoot Magento errors and performance.

1. Magento debugging
Presentation “Magento Debugging” - http://slideshare.net/yireo
Jisse Reitsma (jisse@yireo.com) - Twitter @yireo

2. Basics
System > Configuration > Developer
Logging
Template Path Hints
MAGENTO_ROOT/var/log
Presentation “Magento Debugging” - http://slideshare.net/yireo
Jisse Reitsma (jisse@yireo.com) - Twitter @yireo
system.log
exception.log
MAGENTO_ROOT/var/report
Exception handling > Graylog2, Loggly

3. Blank page
A blanc page tells you nothing
500 Internal Server Error = “look internally for the actual error”
Webserver (Apache, Nginx) error_log
Or enable PHP “display_errors”
Presentation “Magento Debugging” - http://slideshare.net/yireo
Jisse Reitsma (jisse@yireo.com) - Twitter @yireo

4. Magento extensions
Aoe_Profiler
Commerce Bug (astorm)
Mgt_Developertoolbar
Magento Debug (github.com/jreinke)
Magneto Debug
Yireo_ProfilerLog
Yireo_NewRelic
Presentation “Magento Debugging” - http://slideshare.net/yireo
Jisse Reitsma (jisse@yireo.com) - Twitter @yireo

5. Magento command-line tools
n98-magerun (+ composer)
modman
Presentation “Magento Debugging” - http://slideshare.net/yireo
Jisse Reitsma (jisse@yireo.com) - Twitter @yireo

6. Linux tools
git, vim, locate, lockrun
top, ps, free, netstat, vmstat, tcpdump, uptime, nice
lsof, iostat, htop, atop, pidstat
Percona Toolkit
Presentation “Magento Debugging” - http://slideshare.net/yireo
Jisse Reitsma (jisse@yireo.com) - Twitter @yireo

7. PHP environment
Presentation “Magento Debugging” - http://slideshare.net/yireo
Jisse Reitsma (jisse@yireo.com) - Twitter @yireo
PHP settings
log_errors, display_errors, error_reporting
PHP modules
xdebug

8. Magento programming
Mage::setIsDeveloperMode(true);
Zend_Debug::dump($variable);
Mage::log(var_export($entity->debug(), true)));
$model->getData();
Mage::app()->getConfig()->getNode()->asXML()
Presentation “Magento Debugging” - http://slideshare.net/yireo
Jisse Reitsma (jisse@yireo.com) - Twitter @yireo

9. New Relic
Presentation “Magento Debugging” - http://slideshare.net/yireo
Jisse Reitsma (jisse@yireo.com) - Twitter @yireo
Subscriptions
New Relic Free
New Relic Pro > application tracing (14 day trial)
Monitoring
Application (PHP, webserver, MySQL)
Server
Magento
Yireo_NewRelic extension

10. Zend Server
Presentation “Magento Debugging” - http://slideshare.net/yireo
Jisse Reitsma (jisse@yireo.com) - Twitter @yireo
Z-Ray
Deep code inspection
php_prepend_file

11. tweet @yireo
Presentation “Magento Debugging” - http://slideshare.net/yireo
Jisse Reitsma (jisse@yireo.com) - Twitter @yireo