So I have several dedicated servers out there running Ubuntu Lucid server. They primarily run WordPress sites - LAMP. However, one of my original sites is a controls engineering site that uses MathTex to render the equations.
MathTex is pretty hard on servers. The engineering site is still hosted on the original VPS which runs something like CentOS (but that's irrelevant). The traffic and numbers of renderings that MathTex creates cause resource issues with my VPS. I've been able to allocate more resources to the VPS but ultimately this gets expensive. So I'd like to offload the equation rendering to my dedicated servers all of which are much more powerful and under-utilized.
So I've followed the instructions on installing and compiling MathTex. And MathTex works fine from the command line. However, when I attempt to call the script via my browser the browsers all try download the cgi file (I've tested on Firefox and Chrome on 2 machines).
This led me to attempt to compile and install on my home Ubuntu box that is Ubuntu desktop. The command line works fine. However, again when calling the function in my browser it wanted to download the file instead of rendering an equation. So I moved the mathtex.cgi script to /usr/lib/cgi-bin. Still no go. Then I changed /usr/lib/cgi-bin to 777 and it worked. I changed /usr/lib/cgi-bin to 755 and it stopped working.
So my home box works when /usr/lib/cgi-bin is 777. I tried that one of my dedicated Ubuntu servers and still no go. My browser still attempts to download the file.
The directive for Apache to find the cgi-bin directory is in /etc/apache/site-available/default. And at a quick glance they appear to be identical (I haven't yet studied every character).
FYI
I got some help from my hosting company. They are generally pretty good but this is outside the scope of what they provide for free. So when I was switching servers I had a couple of password issues and managed to tack this question on as well.
The support person finally got the mathtex.cgi script to run by creating a /cgi-bin under the domain's folder. Making that folder 777 and adding an AddHandler cgi-script to the http.conf. Then he restarted Apache2.
I had been putting mathtex.cgi under a generic /cgi-bin directory that I had intended to share among all the domains as needed. And this generic /cgi-bin directory appeared to be what the MathTex installation instructions were suggesting.
Hope this helps someone else.
Related
So, I just set up a brand new VPS, installed LAMP, all systems and services working.
I've tried almost everything I could find here on Stack Overflow and other guides, ranging from adding things to Apache's default.conf, to including almost every possible directive in .htaccess known to man (though I hear I technically don't need to use .htaccess, since I have root access?).
I do know that .htaccess is working because I can successfully used DirectoryIndex.
Not sure if relevant, I am using PHP 7.0.
If anyone needs more specific information, I can quickly find it. I really want SSI to be working!
Thanks!
I figured it out finally, for some reason I stumbled upon an entirely different SO thread which had the answer.
I never enabled include.
SOLUTION: a2enmod include.
I'm using WKHtmlToPdf to generate some docs here at work, in internal applications, for over one and half year without any problem. Some applications are coded in C++, some in AutoIt3, and today, after restarting all the computers due to external reasons (power generator would be tested), wkhtmltopdf stopped working on all machines at my company.
I can't even run it from command line. Whether I try to convert a webpage or a local HTML file, it always hangs on 10%. All our machines are Windows 8 32 bits and runs their own install (the applications aren't running under a network share).
I tried downloading wkhtmltopdf again from the website, installing it, etc, but nothing worked. I also tried adding --disable-javascript option, which also didn't work. Cleaning %TEMP% folder did not help too.
I never faced anything like this. All the machines were restarted normally, going to start menu, etc. And it does not look like a network issue, since I'm accessing internet to write this, and we are a small company, we use a standard Wi-Fi router, just like your house. Nothing was changed, no file deleted, no Windows update, no network settings... just a restart. I saw some guys facing the same problem when trying to run wkhtmltopdf from PHP, but in this case, I have this problem even by running it from DOS, as anyone would do.
wkhtmltoimage is working fine. Just wkhtmltopdf stopped working.
Screenshot
In my case, wkhtmltopdf was hanging on files locally stored after the progress counter had made an initial jump to the percentage corresponding to 1 page. It turned out that I had an http_proxy variable set to some unaccessible proxy server. Clearing this environment variable solved the issue.
I'm running XAMPP on my windows machine and experiencing a problem with Apache crashing a couple times a day. When it does, a dialog pops up and I have to manually tell windows to end the program. After I do that, XAMPP automatically starts it back up in a couple of seconds with no issues. When it crashes while I'm not home though, the server is down until I get back. So I have two questions:
Are periodic crashes something that should be expected, or is this indicative of another issue I should be trying to pinpoint?
If this is something I should just learn to deal with, is there a way to automatically restart httpd.exe when these issues occur, so I don't experience down time when I'm away from home?
You'd look into log files, especially the Apache access and error logs, to see what happened, when you are not at home. I've met some similar situation: I have a problematic PHP script hosted on my server, when someone visits the page, it leads to an Apache crash.
I'd suggest you do the investigation as follows:
Search the timestamp of recent Apache restart.
Check the Apache access log to see whether there are some scripts have been accessed.
Manually access these scripts in your browser (to see if Apache will crash again)
You'd better check the PHP error log as well.
If there is really nothing suspicious, you can try WAMP bundle alternatively, which is also a very popular PHP development environment and it is stable.
Although there aren't many cases in which one should "expect" periodic crashes, in this case you are better of reconsidering your setup. From the frontpage of the XAMPP site:
XAMPP is the most popular PHP development environment
Sure, you can use it as "production" server, but XAMPP isn't build for hosting websites, it is intended as development server, so you don't have to manually setup Apache, PHP and MySQL on you dev machine. If you actually want to run your website for the public, setup Apache/IIS, MySQL and PHP manually, those products on there own are made for running in production. Or you can consider getting some cheap shared hosting somewhere, so you don't need to setup anything.
I have apache VM web app running locally. It's red hat.
It's PHP based but the main page is index.html. I am able to to into sub-directories for images and such, I wanted to know if it is possible for me to gain access to the directories that contain the php code, probably just one level above the images directory. Because of index.html, it forces the load, and I am unable to see server files.
Yes there used to be a trick called dot-dot-traversal that could do this. Basically you put two dots into a URL and climb above the web root. Something like http://www.example.com/../../../../etc/shadow . Occasionally a new way to exploit the vulnerability is discovered, but mostly it is rare. Unless you're running an old server, you should be pretty safe.
I have developed a webapplication in my local machine. the application is hosted on tomcat 7.0.22 server. the application is accessed using http://localhost:8080/app
When i use this in my localmachine, I am not facing any problems. But when I intend to share the link with my fellow team mates using the links http://myipaddress:8080/app, I am getting Javascript errors. I placed the js files in the build path of the application.
Even i have noticed the tables width are changed in the same browser
I am unable to find the problem. Can any one help
Thanks,
Vamsi
When testing on your own machine, use your own IP instead of "localhost" and should be able to compare apples with apples and avoid confusing cause and effect.
I would say to check the configuration of your host or vhost files, but if all included JS files are on the same host, that is unlikely to be the problem.
My guess is that you hard coded a path somewhere or that the problem is related to some other difference between testing from your machine and their machine (different browser, versions, plugins, etc) and not actually related at all to the domain. Could possibly also be a file permission problem (but that is a wild guess).