I am creating a Perl script that creates a Net::WebSocket::Server on port 3000. Now I had the (not so brilliant) idea to start the script in the browser via CGI, so it runs in the background and can't be stopped. However, I have to restart the script whenever I modify it.
Is it possible to stop a CGI script in an endless loop, except by restarting the computer?
You didn't say what operating system you are on, so we cannot give you specific advice on how to find and kill the process. But you can always restart the web server application. CGI scripts are children of the server process (probably an Apache) that starts them. If you simply restart the Apache server, they should all be terminated.
Please don't put code that is supposed to run persistently in your cgi-bin directory. That's a bad idea, as you discovered.
Related
Before explaining what my problem is, please know that I have looked up for solutions on similar topics but none of them seems to work nor even to corresponds to my problem.
What I am trying to do:
I have this python code on multiple files that I run with flask with the following command:
python -m flask run --host=0.0.0.0
So far, everything works, but I would like this code to automatically run everytime the computer boots. In the future this will be used on mini PCs without any graphical interface nor human intervention.
Since I need to do some configuration checks before running the web server, I've created a powershell script that ends with Flask running (using the previous command).
So far, everything works too. Now we're coming to the problem:
I'd like this script to run when I boot the machine. Specificity: Every things needs to work with Administrator privileges, on the local system without any interaction.
I've tried scheduled tasks but Flask won't run even if the rest of the script works (like creating folders or other things)
Ok, it's not a big deal I have other ways to do it, so I've created a Windows Service in C# to run the Script at startup on the local system.
The script works, I've checked the privileges too, everything's fine but arriving at the flask command line that is supposed to make it run, nothing works.
It's the same thing if I run flask using "pythonw" which is supposed to run python as a background process.
What the problem seems to be:
Well, as long as I run flask and I have either a command prompt or a powershell terminal, everything works greats. But if in a way or another I run the script as a background process, it won't work.
Normally it would take around 30 seconds for Flask to start-up. Here if I try to create a folder right after flask ended starting up (as a test) I can see the folder is created almost instantly, which means the process is immediately killed.
The problem doesn't seem to come from the service itself but really Windows that kills the process I don't know why
I'm running out of idea so if you guys have anything that I could try it would really help me.
I need some heads up here. I need to write a CGI script which has to connect unix host and execute set of perl scripts.
I am new to CGI world and I have couple of questions in my mind for which I don't know perl solution.
How will connect to Unix host from CGI script. I believe using Net::SSH ,is there any better module to do this ?
Lets assume I have connected to the server , now how would I execute the script and how would I now the status (running/success/failure)
of the script.
a. When its running I would like to see the output that gets generated. Is it possible to view the script output in realtime?
b. If its a failure then I should be notified and reason for failure and should not trigger the next script in sequence.
If someone has similar setup already available and ready to show the code/setup , I would be much happier :)
I have program that I need to run at startup in the background, so far I have it in rc.local like so:
sudo ./simple_program &
However this does not take into consideration if the program crashes. I need it so that whenever the program crashes, it is restarted again.
I think the approach is to write a bash script and run that instead in rc.local, where the bash script calls the simple_program and reruns it if needed. However, I'm not quite sure exactly what to do here. Could someone provide me a template?
Try with monit or daemontools, they are specifically designed to supervise other processes
I've searched and found several very similar questions to mine but nothing in those answers have worked for me yet.
I have a perl CGI script that accepts a file upload. It looks at the file and determines how it should be processed and then calls a second non-CGI script to do the actual processing. At least, that's how it should work.
This is running on Windows with Apache 2.0.59 and ActiveState Perl 5.8.8. The file uploading part works fine but I can't seem to get the upload.cgi script to run the second script that does the actual processing. The second script doesn't communicate in any way with the user that sent the file (other than it sends an email when it's done). I want the CGI script to run the second script (in a separate process) and then 'go away'.
So far I've tried exec, system (passing a 1 as the first parameter), system (without using 1 as first parameter and calling 'start'), and Win32::Process. Using system with 1 as the first parameter gave me errors in the Apache log:
'1' is not recognized as an internal or external command,\r, referer: http://my.server.com/cgi-bin/upload.cgi
Nothing else has given me any errors but they just don't seem to work. The second script logs a message to the Windows event log as one of the first things it does. No log entry is being created.
It works fine on my local machine under Omni webserver but not on the actual server machine running Apache. Is there an Apache config that could be affecting this? The upload.cgi script resides in the d:\wwwroot\test\cgi-bin dir but the other script is elsewhere on the same machine (d:\wwwroot\scripts).
There may be a security related problem, but it should be apparent in the logs.
This won't exactly answer your question but it may give you other implementation ideas where you will not face with potential security and performance problems.
I don't quite like mixing my web server environment with system() calls. Instead, I create an application server (with POE usually) which accepts the relevant parameters from the web server, processes the job, and notifies the web server upon completion. (well, the notification part may not be straightforward but that's another topic.)
I am trying to launch MS Office through WINE using a Perl script hosted by apache
and and triggered by other application. I am getting the following error message in
log files "Application trying to create a window but no driver could not be loaded.
Make sure that your X server is running and that $DISPLAY is set correctly".
If I run the script directly on shell prompt using root user then WINE starts
XServer properly and execute MS MSoffice in addition to that if I set xhost +local:apache on shell prompt then also it works fine.
How can I start the XServer from apache user?
It is an exceedingly bad idea to start a X server per httpd worker. If you insist on doing this though, use Xvfb.
My recommendation would be to have a separate daemon handle the document conversion/creation, and use a message queue to pass it jobs.