Debian/Sail web page display issue.

[PWDasterisk]

I recently installed Debian/Sail using the wiki guide. After the install I noticed the Sail web pages would not display images but functioned correctly. I tried several different installations methods from scratch using Sail 4.0, 4.0.1, and 4.1.0-7 and none of these versions corrected the issue. Other web pages on the server, like Webmin, displayed properly. After some research I found there's an Apache2 issue over the way some sites are structured.

This turned out to be the fix:
echo EnableSendfile off   >>  /etc/apache2/apache2.conf

These are the platform specifics
Linux asterisk 3.2.0-4-686-pae #1 SMP Debian 3.2.68-1+deb7u3 i686 GNU/Linux
asterisk 1:1.8.13.1~dfsg1-3+deb7u3   i386   Open Source Private Branch Exchange (PBX)
sail 4.1.0-7   all   SARK  Asterisk Integration Layer (SAIL) - A fast, lightweight switch for Asterisk
apache2 2.2.22-13+deb7u6   i386   Apache HTTP Server metapackage

You might want to note it in the wiki.

[sysadmin]

That's interesting, we have never seen this issue in several hundred Debian SARK installs.  We'll do some research on it. Do you have the references you used by any chance?

[PWDasterisk]

Are there any specific references are you looking for? There are forum posts all over google about images not being displayed properly in Apache that are not SARK/SAIL specific. Some are permissions related but a large percentage of them have solved the problems with the "EnableSendFile OFF" and/or "EnableMMAP OFF" directives. I just needed the EnableSendFile directive.

According to the Apache Core Documentation:  http://httpd.apache.org/docs/2.2/mod/core.html#EnableSendfile this has to do with the build system not detecting the platform's SendFile support properly. This installation was on a Jetway NF96FL-525-LF Appliance so may not apply to other hardware.

I can tell you that it's an odd problem to troubleshoot. After multiple scratch re-installs I finally uploaded some test images to the /opt/sark/www/sark-common/ folder, see it they displayed in the web page - they didn't,  then downloaded them back again. A binary inspection of the received file showed that it was no longer an image file but a string of error messages truncated at the original file length. Since you never know what hardware SARK/SAIL is being installed on it would save some people a lot of time by noting it in the wiki even though it is not a SARK/SAIL specific issue.

[sysadmin]

OK, thanks for this.