Drupal troubleshooting

Peter Arato (Pronovix)Twitter: @itaratoModules: Graphmind,Bubbletimer, Webcam trigger,Faceted ajax search, Block tab

White screen

Error message

Unexpected behavior

Low performance

Design issues

Bad/old content

What to do?

Prevention

TestsSimpletest, Unittest, Selenium

Quality AssuranceCoder module, PHP Code Sniffer, PHPmd, PHP Depend

Performance toolsab, JMeter, httperf, Siege

Debugging / performance tools xDebug, *cachegrind, MacGDBp Wireshark

Modules

Devel module dpm(), dvm(), dpr(), dvr(), kpr(),dargs(), dd(), ddebug_backtrace(), db_queryd() node access blocks

from https://ratatosk.backpackit.com/pub/

Drupal for FirebugFirefox and Chrome extension firep()

from https://ratatosk.backpackit.com/pub/

Browser toolsFirebug, DOM inspector, HTML validator, YSlow

Journal

configurationini_set() (index.php, ...) .htaccess php.ini

maximum reporting level php.ini (E_ALL) display all errorsdatabase logging and syslog modules

debug_backtrace()

check your limits execution time limit memory limit upload limit post limitphp (apc, suhosin), mysql

be universal no short php tagscoding standards (vars and refs) standard sql test in multiple browsers php 5.2 (yet) use Drupal and the API

use tools (IDE) that helps you syntax highlight function reference safer refactoring debugging code completion

read code

quick checkssite and module settings permissions environment variables clear cache ...

disable modules 1 by 1

try it on a clean Drupal install

sql hacks disable modulesfix encoding problemsset weight of a module clear cache

turn off cachingDrupal caches, JS, CSS,memcache, APC, proxy

go harddump variables debug

ask googleirc (#drupal-contribute) forum issue queue Drupal events ;)

contribute back

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by Peter Arato on Feb 06, 2011