I’m trying to get Drupal to work inside an Alpine Linux docker container but for some reason drush can’t be used to manage the website. The website itselfactually works fine, drush just can’t bootstrap.

Here’s the pertinent information:

 /var/www/html # drush core-status  Drupal version         :  7.56                          Site URI               :  http://default                Database driver        :  mysql                         Database hostname      :  vlp-dcimysql01.dhe.duke.edu   Database port          :                                Database username      :  tmp_drupal                    Database name          :  tmp_drupal                    PHP configuration      :  /etc/php7/php.ini             PHP OS                 :  Linux                         Drush script           :  /usr/bin/drush                Drush version          :  8.1.14                        Drush temp directory   :  /tmp                          Drush configuration    :                                Drush alias files      :                                Drupal root            :  /var/www/html                 Drupal Settings File   :  sites/default/settings.php    Site path              :  sites/default                 /var/www/html # drush wd-show PHP Fatal error:  Uncaught Error: Call to undefined function cache_get() in /var/www/html/includes/module.inc:754 Stack trace: #0 /var/www/html/includes/module.inc(954): module_implements('system_theme_in...') #1 /var/www/html/modules/system/system.module(2511): module_invoke_all('system_theme_in...') #2 /var/www/html/includes/theme.inc(798): _system_rebuild_theme_data() #3 /var/www/html/includes/theme.maintenance.inc(57): list_themes() #4 /var/www/html/includes/bootstrap.inc(2872): _drupal_maintenance_theme() #5 /var/www/html/includes/errors.inc(179): drupal_maintenance_theme() #6 /var/www/html/includes/bootstrap.inc(2609): _drupal_log_error(Array, true) #7 [internal function]: _drupal_exception_handler(Object(Error)) #8 {main}   thrown in /var/www/html/includes/module.inc on line 754 Drush command terminated abnormally due to an unrecoverable error.                                                                                                                                                                     [error] Error: Uncaught Error: Call to undefined function cache_get() in /var/www/html/includes/module.inc:754 Stack trace: #0 /var/www/html/includes/module.inc(954): module_implements('system_theme_in...') #1 /var/www/html/modules/system/system.module(2511): module_invoke_all('system_theme_in...') #2 /var/www/html/includes/theme.inc(798): _system_rebuild_theme_data() #3 /var/www/html/includes/theme.maintenance.inc(57): list_themes() #4 /var/www/html/includes/bootstrap.inc(2872): _drupal_maintenance_theme() #5 /var/www/html/includes/errors.inc(179): drupal_maintenance_theme() #6 /var/www/html/includes/bootstrap.inc(2609): _drupal_log_error(Array, true) #7 [internal function]: _drupal_exception_handler(Object(Error)) #8 {main}   thrown in /var/www/html/includes/module.inc, line 754 

As stated before, the platform is Alpine Linux, PHP is 7.1.9

I can add more if anything is unclear. I’ve check the PHP logs but they just produce the above output. I’m open to there just being a module/extension missing, but I’m not entirely sure how to figure that out if it doesn’t ever tell me “undefined function extensionFunctionX” or something like that. The above undefined function appears to be a Drupal core function.