Deployment fail no matter if wsgi or fastcgi

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Deployment fail no matter if wsgi or fastcgi

8 posts Started 11 years ago by aggiaggiaggiaggi Latest reply from Felix Schwarz

aggiaggiaggiaggi
Member
Posted 11 years ago

Hi there,

i have successfully ran mediacore in development version, but when it comes to deployment i fail

If i try fastcgi, i get a bit of apache error log:
[Sat Jun 02 17:12:33 2012] [warn] [client 188.174.155.93] (104)Connection reset by peer: mod_fcgid: error reading data from FastCGI server
[Sat Jun 02 17:12:33 2012] [error] [client 188.174.155.93] Premature end of script headers: mediacore.fcgi

If i try wsgi, i get nothing at all, all that shows up in access log is:
IP - - [02/Jun/2012:17:49:46 +0200] "GET /my_media HTTP/1.1" 500 610 "-" "Browser Info"

I think i have done everything exactly as it is described. It there any way to get more debug info? All i get on browser end in both cases is:

Internal Server Error

The server encountered an internal error or misconfiguration and was unable to complete your request.

Please contact the server administrator and inform them of the time the error occurred, and anything you might have done that may have caused the error.

More information about this error may be available in the server error log.
aggiaggiaggiaggi
Member
Posted 11 years ago

two things:

after hours of searching this problem starts to get on my nerves. Is there any drawback to just start it with "paster serve --reload deployment.ini" and use apache to proxy to the server instead of using wsgi or fastcgi

the other thing is, i just noticed, that i am getting a lot (as in several per second) of this, can this have to do something with it?

----------------------------------------
Exception happened during processing of request from ('127.0.0.1', 43152)
Traceback (most recent call last):
File "/opt/mediacore_env/lib/python2.6/site-packages/Paste-1.7.4-py2.6.egg/paste/httpserver.py", line 1068, in process_request_in_thread
self.finish_request(request, client_address)
File "/usr/lib/python2.6/SocketServer.py", line 322, in finish_request
self.RequestHandlerClass(request, client_address, self)
File "/usr/lib/python2.6/SocketServer.py", line 618, in __init__
self.finish()
File "/usr/lib/python2.6/SocketServer.py", line 661, in finish
self.wfile.flush()
File "/usr/lib/python2.6/socket.py", line 297, in flush
self._sock.sendall(buffer(data, write_offset, buffer_size))
error: [Errno 32] Broken pipe
Felix Schwarz
MediaDrop developer
Posted 11 years ago

For debugging, go to the directory where your mediacore.fcgi is (using SSH of course) and issue './mediacore.fcgi'. Probably you get a Python exception which tells you what to do.

As for paster I won't recommend it as it was only built for development so there might be more unknown security holes and stability issues. Two more immediate concerns:
- you would need a start script so paster is started whenever your server starts up.
- paster can only use one CPU core so your MediaCore instance can only serve a very limited number of users.

The broken pipe can be ignored. Actually I find it annoying that paster does not catch these exceptions. Basically they happen when a client terminates the connection without saying "good bye" politely.
aggiaggiaggiaggi
Member
Posted 11 years ago

if i call it from command line as the user of the webserver, i get

WSGIServer: missing FastCGI param REQUEST_METHOD required by WSGI!
WSGIServer: missing FastCGI param SERVER_NAME required by WSGI!
WSGIServer: missing FastCGI param SERVER_PORT required by WSGI!
WSGIServer: missing FastCGI param SERVER_PROTOCOL required by WSGI!
Status: 404 Not Found
...

(which i assume is correct when running from command line) and html code of what seems to be the standard 'not found' page of mediacore.

Here is what i found out in the meantime by increasing log verbosity:

rewrite rules from .htaccess work and redirect to mediacore.fcgi

i am running on a plesk installation which uses some weird apache configuration, but i made sure that the following is enabled to the host:

<Directory /var/www/host>
Options Indexes FollowSymLinks MultiViews
AllowOverride All
Order allow,deny
allow from all
</Directory>

plus, when trying the wsgi version, the config from the installation description was in there

But thats it, it just says nothing. Apache is starting the fcgi, and the fcgi just quits for an unknown reason, while it works from command line :-/
Felix Schwarz
MediaDrop developer
Posted 11 years ago

That looks good. Did you check suexec logs? Very likely the problem is a permission error. If suexec works (check log), su to the user which should run mediacore and try if you can execute mediacore.fcgi.

Also check selinux.
aggiaggiaggiaggi
Member
Posted 11 years ago

Thank you, that was the problem. I was running it on standard server installations until now where webserver is running under the user www-data or apache.

Plesk does handle it a bit different, to get the fcgi version running on a plesk installations you have to do the following:

Get the admin user of the virtual host, every virtualhost on plesk has its own admin/password combination that you specify when creating it.

Then you have to set exactly this user/group combinations to get it work:

sudo chown [adminuser].psaserv [webdirectory] [webdirectory]/.htaccess sudo chown [adminuser].psacln [webdirectory]/mediacore.fcgi sudo chown -R [adminuser].psaserv [mediacore_inst]/data
aggiaggiaggiaggi
Member
Posted 11 years ago

Update:

With Plesk you also have to install mediacore within the root directory of the specific host (/var/www/vhosts/myhost), or you will not be able write into your data directory, even if you give full write access to the world
Felix Schwarz
MediaDrop developer
Posted 11 years ago

Thanks for sharing the solution here :-)

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Deployment fail no matter if wsgi or fastcgi

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