Wordpress White screen of death on fresh WP option 22 install when saving WP super cache settings

FAQ item 19 lists where php-fpm error logs are

You can check them to see what errors exist as centmin mod by default has php expose errors disabled for security purposes, so all you see and all other visitors would see is a blank page

Any clues in your access.log and error.log in vhost listed paths at

Code (Text):

access_log /home/nginx/domains/domain.com/log/access.log combined buffer=256k flush=60m;
error_log /home/nginx/domains/domain.com/log/error.log;

I assume you're using centmin mod 123.08stable as that centmin.sh menu option 22 isn't as advanced/improved as the version in 123.09beta01. So if you're still testing, I'd suggest you reload a fresh CentOS OS and try centmin mod 123.09beta01 - 1st post at Beta Branch - Centmin Mod .09 beta branch Testing | Centmin Mod Community has instructions for install. It's going to be the next stable version soon with heaps of improvements as per change log in 2nd post of that thread. Centmin Mod 123.09beta01 centmin.sh menu option 22 switches from WP Super Cache to KeyCDN Cache Enabler which is less problematic and easier to get started with and has same performance still

 

google returns issues with wp super cache !

• undefined function wpsc_deep_replace() · Issue #75 · Automattic/wp-super-cache · GitHub
• WordPress › Support » Unable to clear cached files
• WordPress › Support » PHP Fatal Error on Delete Cache & Settings Pages

 

Info on KeyCDN Cache Enabler as WP Super Cache alternative Wordpress - WP Cacher Enabler Plugin by KeyCDN folks | Centmin Mod Community it outlines manual way of switching from WP Super Cache to KeyCDN Cache Enabler. If you use centmin mod 123.09beta01 centmin.sh menu option 22, then it automatically sets up KeyCDN Cache Enabler.

 

It's partially why 123.09beta01 centmin.sh menu 22 switched from WP Super Cache to KeyCDN Cache Enabler

with white screens, again check php-fpm error log for clues

if you want to delete plugins you can also use wp-cli command within your wordpress install directory wp plugin | WP-CLI

specific command wp plugin deactivate | WP-CLI to deactivate and uninstall where /home/nginx/domains/yourdomain.com/public is where wp was installed

Code (Text):

cd /home/nginx/domains/yourdomain.com/public
wp plugin deactivate wp-super-cache --uninstall --allow-root

for example in 123.09beta01 centmin.sh menu option 22, to get wp plugin status and deactivate and reactive a wp plugin called optimus you'd do

Code (Text):

cd /home/nginx/domains/testdomain.com/public

wp plugin status --allow-root
8 installed plugins:
  I akismet                         3.1.10
  A cache-enabler                   1.0.9
  A cdn-enabler                     1.0.2
  A disable-xml-rpc                 1.0.1
  A optimus                         1.4.5
  A sucuri-scanner                  1.7.17
  A wp-super-cache                  1.4.8
  A wp-super-cache-clear-cache-menu 1.3.1

Legend: I = Inactive, A = Active

Code (Text):

wp plugin deactivate optimus --allow-root
Success: Plugin 'optimus' deactivated.

Code (Text):

wp plugin status --allow-root          
8 installed plugins:
  I akismet                         3.1.10
  A cache-enabler                   1.0.9
  A cdn-enabler                     1.0.2
  A disable-xml-rpc                 1.0.1
  I optimus                         1.4.5
  A sucuri-scanner                  1.7.17
  A wp-super-cache                  1.4.8
  A wp-super-cache-clear-cache-menu 1.3.1

Legend: I = Inactive, A = Active

wp plugin activate optimus --allow-root
Success: Plugin 'optimus' activated.

permissions

Code (Text):

ls -lah /home/nginx/domains/testdomain.com/public/wp-content/plugins/
total 16K
drwxr-sr-x 10 nginx nginx 4.0K May  2 12:44 .
drwxr-s---  7 nginx nginx  140 May  2 12:44 ..
drwxr-sr-x  4 nginx nginx 4.0K May  2 12:43 akismet
drwxr-xr-x  5 nginx nginx   77 May  2 12:43 cache-enabler
drwxr-xr-x  3 nginx nginx   55 May  2 12:43 cdn-enabler
drwxr-xr-x  2 nginx nginx   49 May  2 12:43 disable-xml-rpc
-rw-r--r--  1 nginx nginx   28 May  2 12:43 index.php
drwxr-xr-x  6 nginx nginx   81 May  2 12:43 optimus
drwxr-xr-x  3 nginx nginx  117 May  2 12:43 sucuri-scanner
drwxr-xr-x  4 nginx nginx 4.0K May  2 12:43 wp-super-cache
drwxr-xr-x  3 nginx nginx   81 May  2 12:43 wp-super-cache-clear-cache-menu

 

bug fixed just now heh Beta Branch - wp super cache fix centmin.sh menu option 22 for 123.09beta01 | Centmin Mod Community

just disable them manually and you should be good to go

Code (Text):

cd /home/nginx/domains/yourdomain.com/public
wp plugin deactivate wp-super-cache --uninstall --allow-root
wp plugin deactivate wp-super-cache-clear-cache-menu --uninstall --allow-root

not really new just evolving feature as it is 123.09beta01 .. but yeah wouldn't be as on top of things as Easyengine for wordpress as Easyengine/rtcamp have 37+ staff members versus Centmin Mod has alot more features going on with it and I am only one person doing this in my free time (which is lacking right now due to my mother heart surgery & care right now)

fyi, here's centmin.sh menu option 22 test site at wordpress7.centminmod.com - Centmin Mod LEMP stack Wordpress Auto Installer on CentOS 7.0 which i setup for demo'ing so you can see it working etc

to update 123.09beta01 with fixed code just use centmin.sh menu option 23 submenu option 2 to use git to update your local centmin mod code

Upgrading Centmin Mod Code to Latest Version

Getting Started Guide step 19 outlines also how to keep Centmin Mod code updated or how to switch version branches.

Centmin Mod LEMP stack's script code is constantly updated for improvements, bug fixes and security fixes so keeping the Centmin Mod code up to date is important. With Centmin Mod 1.2.3-eva2000.08) (123.08stable) and higher releases, a newly added centmin.sh menu option 23 allows much easier code updates and version branch swicthing via Git backed environment you can setup. For full details read the following links:

• New centmin.sh menu option 23 updating
• Centmin Mod Upgrades
• Cronjob Auto Updating Centmin Mod Code Guide

Upgrading Centmin Mod involves 2 parts.

1. Upgrading the actual Centmin Mod code outlined at Upgrade Centmin Mod. This is heart of Centmin Mod where the code is the engine that runs centmin.sh shell based menu and all the automation you're accustomed to. You can easily update within a Centmin Mod version branch or switch version branches via centmin.sh menu option 23 outlined here.
2. Upgrade software that Centmin Mod installed or manages. For this part following outline at How to upgrade Centmin Mod software installed on your server.

So essentially, you can upgrade from .07 to .08 in place, but not everything is upgraded as some things like server initial environment setup isn't changed i.e. how swap, tmp setup and allocation are created etc. The main parts from part 2 above are what in place upgrades do i.e. Nginx and PHP-FPM compilation and config/settings parameters and MariaDB version from 5.5 to 10.0.x. If you want the full environment changed including tmp and swap setup to .08's configuration, then you would need a fresh OS install and fresh .08 initial install. You can think of it like upgrading Windows 7 to Windows 8. An in place upgrade will upgrade code but won't change your computer environment from when you installed Windows 7 i.e. disk configuration and partition sizes won't change from when you initially installed Windows 7. Only way to change that would be fresh Windows 8 install.


edit: guess wp super cache code is buggy as even wp-cli uninstall has issues

Code (Text):

 wp plugin deactivate wp-super-cache --uninstall --allow-root

PHP Warning:  include(/home/nginx/domains/testdomain2.com/public/wp-content/wp-cache-config.php): failed to open stream: No such file or directory in /home/nginx/domains/testdomain2.com/public/wp-content/plugins/wp-super-cache/wp-cache-phase1.php on line 7
Warning: include(/home/nginx/domains/testdomain2.com/public/wp-content/wp-cache-config.php): failed to open stream: No such file or directory in /home/nginx/domains/testdomain2.com/public/wp-content/plugins/wp-super-cache/wp-cache-phase1.php on line 7
PHP Warning:  include(): Failed opening '/home/nginx/domains/testdomain2.com/public/wp-content/wp-cache-config.php' for inclusion (include_path='phar:///usr/bin/wp/vendor/phpunit/php-token-stream:phar:///usr/bin/wp/vendor/phpunit/phpunit-mock-objects:phar:///usr/bin/wp/vendor/phpunit/php-code-coverage:phar:///usr/bin/wp/vendor/phpunit/phpunit:phar:///usr/bin/wp/vendor/symfony/yaml:.:/usr/local/lib/php') in /home/nginx/domains/testdomain2.com/public/wp-content/plugins/wp-super-cache/wp-cache-phase1.php on line 7
Warning: include(): Failed opening '/home/nginx/domains/testdomain2.com/public/wp-content/wp-cache-config.php' for inclusion (include_path='phar:///usr/bin/wp/vendor/phpunit/php-token-stream:phar:///usr/bin/wp/vendor/phpunit/phpunit-mock-objects:phar:///usr/bin/wp/vendor/phpunit/php-code-coverage:phar:///usr/bin/wp/vendor/phpunit/phpunit:phar:///usr/bin/wp/vendor/symfony/yaml:.:/usr/local/lib/php') in /home/nginx/domains/testdomain2.com/public/wp-content/plugins/wp-super-cache/wp-cache-phase1.php on line 7
Success: Plugin 'wp-super-cache' deactivated.

Code (Text):

Uninstalling 'wp-super-cache'...
PHP Fatal error:  Cannot redeclare wp_super_cache_text_domain() (previously declared in /home/nginx/domains/testdomain2.com/public/wp-content/plugins/wp-super-cache/wp-cache.php:68) in /home/nginx/domains/testdomain2.com/public/wp-content/plugins/wp-super-cache/wp-cache.php on line 69
Fatal error: Cannot redeclare wp_super_cache_text_domain() (previously declared in /home/nginx/domains/testdomain2.com/public/wp-content/plugins/wp-super-cache/wp-cache.php:68) in /home/nginx/domains/testdomain2.com/public/wp-content/plugins/wp-super-cache/wp-cache.php on line 69

deactivating works with errors

Code (Text):

wp plugin deactivate wp-super-cache --allow-root               
PHP Warning:  include(/home/nginx/domains/testdomain2.com/public/wp-content/wp-cache-config.php): failed to open stream: No such file or directory in /home/nginx/domains/testdomain2.com/public/wp-content/plugins/wp-super-cache/wp-cache-phase1.php on line 7
Warning: include(/home/nginx/domains/testdomain2.com/public/wp-content/wp-cache-config.php): failed to open stream: No such file or directory in /home/nginx/domains/testdomain2.com/public/wp-content/plugins/wp-super-cache/wp-cache-phase1.php on line 7
PHP Warning:  include(): Failed opening '/home/nginx/domains/testdomain2.com/public/wp-content/wp-cache-config.php' for inclusion (include_path='phar:///usr/bin/wp/vendor/phpunit/php-token-stream:phar:///usr/bin/wp/vendor/phpunit/phpunit-mock-objects:phar:///usr/bin/wp/vendor/phpunit/php-code-coverage:phar:///usr/bin/wp/vendor/phpunit/phpunit:phar:///usr/bin/wp/vendor/symfony/yaml:.:/usr/local/lib/php') in /home/nginx/domains/testdomain2.com/public/wp-content/plugins/wp-super-cache/wp-cache-phase1.php on line 7
Warning: include(): Failed opening '/home/nginx/domains/testdomain2.com/public/wp-content/wp-cache-config.php' for inclusion (include_path='phar:///usr/bin/wp/vendor/phpunit/php-token-stream:phar:///usr/bin/wp/vendor/phpunit/phpunit-mock-objects:phar:///usr/bin/wp/vendor/phpunit/php-code-coverage:phar:///usr/bin/wp/vendor/phpunit/phpunit:phar:///usr/bin/wp/vendor/symfony/yaml:.:/usr/local/lib/php') in /home/nginx/domains/testdomain2.com/public/wp-content/plugins/wp-super-cache/wp-cache-phase1.php on line 7
Success: Plugin 'wp-super-cache' deactivated.

uninstall on its own works with errors

Code (Text):

wp plugin uninstall wp-super-cache --allow-root             
PHP Warning:  include(/home/nginx/domains/testdomain2.com/public/wp-content/wp-cache-config.php): failed to open stream: No such file or directory in /home/nginx/domains/testdomain2.com/public/wp-content/plugins/wp-super-cache/wp-cache-phase1.php on line 7
Warning: include(/home/nginx/domains/testdomain2.com/public/wp-content/wp-cache-config.php): failed to open stream: No such file or directory in /home/nginx/domains/testdomain2.com/public/wp-content/plugins/wp-super-cache/wp-cache-phase1.php on line 7
PHP Warning:  include(): Failed opening '/home/nginx/domains/testdomain2.com/public/wp-content/wp-cache-config.php' for inclusion (include_path='phar:///usr/bin/wp/vendor/phpunit/php-token-stream:phar:///usr/bin/wp/vendor/phpunit/phpunit-mock-objects:phar:///usr/bin/wp/vendor/phpunit/php-code-coverage:phar:///usr/bin/wp/vendor/phpunit/phpunit:phar:///usr/bin/wp/vendor/symfony/yaml:.:/usr/local/lib/php') in /home/nginx/domains/testdomain2.com/public/wp-content/plugins/wp-super-cache/wp-cache-phase1.php on line 7
Warning: include(): Failed opening '/home/nginx/domains/testdomain2.com/public/wp-content/wp-cache-config.php' for inclusion (include_path='phar:///usr/bin/wp/vendor/phpunit/php-token-stream:phar:///usr/bin/wp/vendor/phpunit/phpunit-mock-objects:phar:///usr/bin/wp/vendor/phpunit/php-code-coverage:phar:///usr/bin/wp/vendor/phpunit/phpunit:phar:///usr/bin/wp/vendor/symfony/yaml:.:/usr/local/lib/php') in /home/nginx/domains/testdomain2.com/public/wp-content/plugins/wp-super-cache/wp-cache-phase1.php on line 7
Success: Uninstalled and deleted 'wp-super-cache' plugin.

plugin status with wp-super-cache uninstalled

Code (Text):

wp plugin status --allow-root                 
7 installed plugins:
  I akismet                         3.1.10
  A cache-enabler                   1.0.9
  A cdn-enabler                     1.0.2
  A disable-xml-rpc                 1.0.1
  A optimus                         1.4.5
  A sucuri-scanner                  1.7.17
  I wp-super-cache-clear-cache-menu 1.3.1

Legend: I = Inactive, A = Active

ah i see what the bug is now, when wp-super-cache was incorrectly activated, it didn't setup
/home/nginx/domains/testdomain2.com/public/wp-content/wp-cache-config.php file as keycdn cacher enabler is the default caching option, so the
/home/nginx/domains/testdomain2.com/public/wp-content/wp-cache-config.php file is missing. Should be fixed in latest 123.09beta01 as a result of fixing the incorrectly activated wp-super-cache plugin