New subject: still questions about thumbnails and previews

10 Aug 2016

Hi Greg,
Thank you for your response! I tried the suggestions, but still facing same
problems. Were there any further suggestions?

I already changed the owner to be www-data, set log files and rebuilt
images.

I got debug logs like follows:
"...
FSFileBackend::getFileListInternal() given directory does not exist:
'/var/www/HIWeb/dir/wiki/images/3/3e'
FSFileBackend::getFileListInternal() given directory does not exist:
'/var/www/HIWeb/dir/wiki/images/3/3f'
FSFileBackend::getFileListInternal() given directory does not exist:
'/var/www/HIWeb/dir/wiki/images/4/40'
FSFileBackend::getFileListInternal() given directory does not exist:
'/var/www/HIWeb/dir/wiki/images/4/41'
FSFileBackend::getFileListInternal() given directory does not exist:
'/var/www/HIWeb/dir/wiki/images/4/42'
..."

I think the log is reasonable and tell no more issues.

Btw, what the "preview" means in the last post was: when you open a
"File:xxxx.png" page, it should show a preview image directly on the page.
But I have no preview images and thumbnails currently.

Thanks,
Jingyi

---------- My original question ----------

Hi all,

Thanks to some help about my previous thumbnails question: "I uploaded a
png image but no thumbnails created in the File page."

I have tried several methods but the thumbnails are still not working. I
still face the problems that I have neither thumbnails or preview images in
'File:' pages.

I have already installed ImageMagick in my Ubuntu.
What I have tried was to:
1. check wiki/images/thumb/ folder, but only old thumbnails are there.
(Yes, I used to have thumbnails several month ago.) No new ones that I
uploaded recently are there.
2. chowe -R root:root wiki/images/  and  chmod -R 777 /wiki/images/
2. change memory consumption by increasing $wgMaxShellMemory to 409600 in
LocalSetting.php, but still no thumbnails appears.

So here are my new questions:
1. Small images (like 500kb) can sometimes have previews (but no
thumbnails). But large images always no previews. How to fix?
2. I have a strange finding. Some jpg images can show the previews in my
home computer but cannot show previews in my office computer. What may
cause that?
3. My current MW version is 1.26. And my PHP version is a little bit out of
date: 5.3.10. May this cause a problem related to previews and thumbnails?

Looking forward to your further help.

Thank you,
Jingyi

---------- Forwarded message ----------

Message: 1
Date: Wed, 3 Aug 2016 09:20:40 -0400
From: "Greg Rundlett (freephile)" &lt;greg(a)freephile.com&gt;
To: MediaWiki announcements and site admin list
        &lt;mediawiki-l(a)lists.wikimedia.org&gt;
Subject: Re: [MediaWiki-l] still questions about thumbnails and
        previews
Message-ID:
        &lt;CANaytccrq72TEP9FpQb-mTHoZKhn37WB8F5S0e-NsMOZNj_YsA(a)mail.gmail.com&gt;
Content-Type: text/plain; charset=UTF-8

Greg Rundlett
https://eQuality-Tech.com
https://freephile.org

On Tue, Aug 2, 2016 at 10:49 PM, Jingyi C. Shi &lt;jshizhang(a)gmail.com&gt; wrote:

...
  Hi all,

 Thanks to some help about my previous thumbnails question: "I uploaded a
 png image but no thumbnails created in the File page."

 I have tried several methods but the thumbnails are still not working. I
 still face the problems that I have neither thumbnails or preview images in
...
  'File:' pages.

 I have already installed ImageMagick in my Ubuntu.
 What I have tried was to:
 1. check wiki/images/thumb/ folder, but only old thumbnails are there.
 (Yes, I used to have thumbnails several month ago.) No new ones that I
 uploaded recently are there.
 2. chowe -R root:root wiki/images/  and  chmod -R 777 /wiki/images/

Actually, the images directory (and subdirectories) should be owned by the
web server user (that's *www-data* for Ubuntu)

If you enter the command

ps aux | egrep '(apache|httpd)'

and look at the first column, you'll be able to confirm that your webserver
is running as www-data

Then you can change ownership on the directory and subdirectories like so:

sudo chown -R www-data:www-data ./wiki/images

In general, you should setup a debug log file[1] to find out what's going
wrong with MediaWiki.

[1]
https://www.mediawiki.org/wiki/Manual:How_to_debug#Setting_up_a_debug_log_f…

...
  2. change memory consumption by increasing
$wgMaxShellMemory to 409600 in
 LocalSetting.php, but still no thumbnails appears.

 So here are my new questions:
 1. Small images (like 500kb) can sometimes have previews (but no
 thumbnails). But large images always no previews. How to fix?
 2. I have a strange finding. Some jpg images can show the previews in my
 home computer but cannot show previews in my office computer. What may
 cause that?
 3. My current MW version is 1.26. And my PHP version is a little bit out of
...
  date: 5.3.10. May this cause a problem related to
previews and thumbnails?

 I'm not sure what you mean by 'previews'.  When you upload a file into
MediaWiki via Special:Upload, it simply stores the file on the webserver
and generates thumbnails as configured.  Those thumbnails get stored in the
"thumbs" directory on the server. When you go to *Special:ListFiles* (e.g.
https://freephile.org/wiki/Special:ListFiles), it will show a list of
uploaded files, with a thumbnail representation of each file.

Since you are having problems with your file uploads and thumbnail
generation, you should probably run the 'rebuildImages' script in the
maintenance folder.

cd wiki/maintenance
php ./rebuildImages --dry-run
php ./rebuildImages --missing

Re: [MediaWiki-l] still questions about thumbnails and previews