I currently maintain a wiki where I am the sole sysop and editor, but the
wiki is publicly accessible for read-only access. I'm not sure how long
this has been going on, but I've recently noticed that when I'm not logged
in, I'm starting to get "Error creating thumbnail: Unable to save thumbnail
to destination" errors on pages that contain images. This sounded similar
to some recent messages I've seen on the list about thumbnails not working,
so I started doing some digging. What's *really* interesting is that, as
soon as I log in, the images start working correctly! The effect is
completely repeatable: If I log in, the image displays fine; once I log
out, the thumbnail error reappears.
Naturally, I've already checked to make sure ImageMagick is properly
installed and working correctly; after all, it's creating thumbnails fine
when I'm logged in. I've also checked the file permissions to my images
folder and it is writable by the Apache user/group. What baffles me most
is why the thumbnails would work fine when I'm logged in, but fail when I'm
not; from the web server perspective, permissions shouldn't be an issue
since everything would be operating under the Apache context. Clearing the
file cache (php rebuildFileCache.php) and the images (php rebuildImages.php)
has no effect.
MediaWiki: 1.27.0
PHP: 5.6.15 (apache2handler)
MariaDB: 10.0.21-MariaDB
ICU: 52.1
ImageMagick: 6.8.8.10
Any ideas?
Jeffrey T. Darlington
General Protection Fault
http://www.gpf-comics.com/