- Issue created by @kaszarobert
This should never happen. We should fix the underlying bug. There is this old bug report which seems similar: #2974321: Existing site redirects to core/install.php on error. →
We're experiencing that sometimes when the traffic gets really high and more connections are present on the server, core redirects pages to /core/install.php Visitors are greeted with the Drupal install page or "Drupal is already installed" page. And since this install page returns HTTP 200 OK, this also means this page could be cached by reverse proxy caches and uptime metrics are also thinking the site works and not reporting that the site is down.
According to the error log, in these cases where we experience this redirect, it is always a problem with database connections:
2024/08/01 04:51:45 [error] 903604#903604: *41431660 FastCGI sent in stderr: "PHP message: PDOException: SQLSTATE[HY000] [2006] MySQL server has gone away in /home/web/core/lib/Drupal/Component/DependencyInjection/PhpArrayContainer.php on line 79 #0 /home/web/core/lib/Drupal/Core/Database/Driver/mysql/Connection.php(416): PDO->__construct()
#1 /home/web/core/lib/Drupal/Core/Database/Database.php(371): Drupal\Core\Database\Driver\mysql\Connection::open()
#2 /home/web/core/lib/Drupal/Core/Database/Database.php(166): Drupal\Core\Database\Database::openConnection()
#3 [internal function]: Drupal\Core\Database\Database::getConnection()
#4 /home/web/core/lib/Drupal/Component/DependencyInjection/PhpArrayContainer.php(79): call_user_func_array()
#5 /home/web/core/lib/Drupal/Component/DependencyInjection/Container.php(173): Drupal\Component\DependencyInjection\PhpArrayContainer->createService()
#6 /home/web/core/lib/Drupal/Component/DependencyInjection/PhpArrayContainer.php(265): Drupal\Component\Dep" while reading response header from upstream, client: 127.0.0.1
2024/08/01 04:51:45 [error] 903604#903604: *41431645 FastCGI sent in stderr: "PHP message: PDOException: SQLSTATE[HY000] [2002] Connection refused in /home/web/core/lib/Drupal/Component/DependencyInjection/PhpArrayContainer.php on line 79 #0 /home/web/core/lib/Drupal/Core/Database/Driver/mysql/Connection.php(416): PDO->__construct()
#1 /home/web/core/lib/Drupal/Core/Database/Database.php(374): Drupal\Core\Database\Driver\mysql\Connection::open()
#2 /home/web/core/lib/Drupal/Core/Database/Database.php(169): Drupal\Core\Database\Database::openConnection()
#3 [internal function]: Drupal\Core\Database\Database::getConnection()
#4 /home/web/core/lib/Drupal/Component/DependencyInjection/PhpArrayContainer.php(79): call_user_func_array()
#5 /home/web/core/lib/Drupal/Component/DependencyInjection/Container.php(173): Drupal\Component\DependencyInjection\PhpArrayContainer->createService()
#6 /home/web/core/lib/Drupal/Component/DependencyInjection/PhpArrayContainer.php(212): Drupal\Component\DependencyInjectio" while reading response header from upstream, client: 127.0.0.1
2024/08/01 04:51:45 [error] 903601#903601: *41431625 FastCGI sent in stderr: "PHP message: Failed to log error: PDOException: SQLSTATE[HY000] [2002] Connection refused in Drupal\dblog\Logger\DbLog->log() (line 101 of /home/web/core/modules/dblog/src/Logger/DbLog.php). #0 /home/web/core/modules/mysql/src/Driver/Database/mysql/Connection.php(189): PDO->__construct()
#1 /home/web/core/lib/Drupal/Core/Database/Database.php(463): Drupal\mysql\Driver\Database\mysql\Connection::open()
#2 /home/web/core/lib/Drupal/Core/Database/Database.php(188): Drupal\Core\Database\Database::openConnection()
#3 /home/web/core/modules/dblog/src/Logger/DbLog.php(101): Drupal\Core\Database\Database::getConnection()
#4 /home/web/core/lib/Drupal/Core/Logger/LoggerChannel.php(127): Drupal\dblog\Logger\DbLog->log()
#5 /home/web/core/lib/Drupal/Core/EventSubscriber/ExceptionLoggingSubscriber.php(70): Drupal\Core\Logger\LoggerChannel->log()
#6 /home/web/core/lib/Drupal/Core/EventSubscriber/ExceptionLoggingSubscriber.php(97): Drupal\Core\EventSubscriber\ExceptionLogg...PHP message: PDOException: SQLSTATE[HY000] [2002] Connection refused in /home/web/core/modules/dblog/src/Logger/DbLog.php on line 101 #0 /home/web/core/modules/mysql/src/Driver/Database/mysql/Connection.php(189): PDO->__construct()
#1 /home/web/core/lib/Drupal/Core/Database/Database.php(463): Drupal\mysql\Driver\Database\mysql\Connection::open()
#2 /home/web/core/lib/Drupal/Core/Database/Database.php(188): Drupal\Core\Database\Database::openConnection()
#3 /home/web/core/modules/dblog/src/Logger/DbLog.php(101): Drupal\Core\Database\Database::getConnection()
#4 /home/web/core/lib/Drupal/Core/Logger/LoggerChannel.php(127): Drupal\dblog\Logger\DbLog->log()
#5 /home/web/core/lib/Drupal/Core/EventSubscriber/ExceptionLoggingSubscriber.php(70): Drupal\Core\Logger\LoggerChannel->log()
#6 /home/web/core/lib/Drupal/Core/EventSubscriber/ExceptionLoggingSubscriber.php(97): Drupal\Core\EventSubscriber\ExceptionLog
For deployed and live sites it would make sense to never redirect to install.php ever, the best option would be introducing a setting in settings.php and if that is true, then instead of redirecting, core should throw an HTTP 500 error with WSOD instead if there's a problem with the database connection or something is missing from the database.
Active
11.0 🔥
This should never happen. We should fix the underlying bug. There is this old bug report which seems similar: #2974321: Existing site redirects to core/install.php on error. →