Questions[pylons](server)

I am operating a Debian Jessie server in a local network, which is separated from Internet. Therefore, it does not have a DNS server available.

On this server I try to launch a self-developed web application using Python Pyramid and the waitress server. This launching failes if the server is not connected to internet with the following error:

File "/usr/local/lib/python3.4/dist-packages/waitress-1.0.0-py3.4.egg/waitress/server.py", line 292, in getsockname
    self.socketmod.NI_NUMERICSERV)
socket.gaierror: [Errno -3] Temporary failure in name resolution

Everything works fine if the server is connected to Internet and has a DNS server configured.

How can I resolve this, to successfully start waitress without a reachable DNS server?

I am setting up CKAN, a pylons application according to these instructions: http://packages.python.org/ckan/deployment.html

But when I point to the server (no DNS setup yet) using IP or hostname, I only see apache's greeting page, sugesting the ckan app is not being loaded.

here is my mod_wsgi script:

import os
instance_dir = '/home/flavio/var/srvc/ckan.emap.fgv.br'
config_file = 'ckan.emap.fgv.br.ini'
pyenv_bin_dir = os.path.join(instance_dir, 'pyenv', 'bin')
activate_this = os.path.join(pyenv_bin_dir, 'activate_this.py')
execfile(activate_this, dict(__file__=activate_this))
from paste.deploy import loadapp
config_filepath = os.path.join(instance_dir, config_file)
from paste.script.util.logging_config import fileConfig
fileConfig(config_filepath)
application = loadapp('config:%s' % config_filepath)

here is my virtual host configuration:

<VirtualHost *:80>

ServerName dck093

ServerAlias dck093

WSGIScriptAlias / /home/flavio/var/srvc/ckan.emap.fgv.br/pyenv/bin/ckan.emap.fgv.br.py
# pass authorization info on (needed for rest api)
WSGIPassAuthorization On

ErrorLog /var/log/apache2/ckan.emap.fgv.br.error.log
CustomLog /var/log/apache2/ckan.emap.fgv.br.custom.log combined
<Directory /home/flavio/var/srvc/ckan.emap.fgv.br/pyenv/bin>
    Order deny,allow
    Allow from all
</Directory>
</VirtualHost>

I try to disable the 000-default site (with a2dissite), but that dind't help.After doing this I get an Internal server error page, but no log message. Can anyone point out what am I missing?

Currently I am using nginx to reverse proxy paster, to server Mediacore (a Pylons app). However, this configuration fails when I try to submit a video. I particualrly try to avoid fat appache, which is the official Mediacore recommendation. In a famous "benchmark of python webservers" I've seen that uwsgi has amazing performance but it is rather newcommer. So I could not find any good tutorial for it which is both comprehensive and noob-friendly. So I I appreciate if you could refere me to such guide to set up any of the high-performance python webservers. Thanks in advance for your hints.

I tried to deploy my Pylons app using the instructions found here. This simply loads the default Pylons page when I visit the root of my domain. When I try to enter in any path, I receive the message

Unhandled Exception

An unhandled exception was thrown by the application.

When I view the error log for my application and the Apache error log, it seems Pylons always tries to route things to the error controller. However, note that the above message is not what my error controller should be outputting.

Any suggestions on what to check? I love developing with Pylons, but this is my first attempt at deployment. I've tried multiple configurations on multiple different web servers and I haven't had any luck.

UPDATE: Below is the config for my Pylons app (comments stripped to make it a bit shorter)

[DEFAULT]
smtp_server = localhost
error_email_from = paste@localhost

[server:main]
use = egg:PasteScript#flup_fcgi_thread

[app:main]
use = egg:linkdb
full_stack = true
static_files = true

cache_dir = %(here)s/data
beaker.session.key = linkdb
beaker.session.secret = b75f1813263ab9a082f67278daa26433

sqlalchemy.url = mysql://cclp:[email protected]/ccorl

authkit.setup.enable = True
authkit.setup.method = form, cookie
authkit.form.authenticate.user.type = linkdb.model.auth:MyUsersFromDatabase
authkit.form.authenticate.user.data = linkdb.model
authkit.cookie.secret = c2b47614b6eb46c4bd7842cae10f27e4
authkit.cookie.signoutpath = /users/logout
authkit.form.template.obj = linkdb.model.auth:make_template

set debug = false

[loggers]
keys = root, routes, linkdb, sqlalchemy

[handlers]
keys = console

[formatters]
keys = generic

[logger_root]
level = INFO
handlers = console

[logger_routes]
level = INFO
handlers =
qualname = routes.middleware

[logger_linkdb]
level = DEBUG
handlers =
qualname = linkdb

[logger_sqlalchemy]
level = WARN
handlers =
qualname = sqlalchemy.engine

[handler_console]
class = StreamHandler
args = (sys.stderr,)
level = NOTSET
formatter = generic

[formatter_generic]
format = %(asctime)s,%(msecs)03d %(levelname)-5.5s [%(name)s] %(message)s
datefmt = %H:%M:%S

UPDATE: And here is the error log produced by the application (I'm paranoid, so I starred out the IP addresses)

DEBUG:authkit.authenticate.cookie:These cookies were found: []
DEBUG:authkit.authenticate.cookie:Our cookie 'authkit' value is therefore ''
DEBUG:authkit.authenticate.cookie:Remote addr '***.***.***.***', value '', include_ip True
DEBUG:pylons.wsgiapp:Setting up Pylons stacked object globals
DEBUG:pylons.wsgiapp:No controller found, returning 404 HTTP Not Found
DEBUG:authkit.authenticate.multi:Status: '404 Not Found', Headers: [('Content-Type', 'text/html; charset=UTF-8'), ('Content-Length', '154')]
DEBUG:authkit.authenticate.multi:Status checker recieved status '404 Not Found', headers [('Content-Type', 'text/html; charset=UTF-8'), ('Content-Length', '154')], intecept ['401']
DEBUG:authkit.authenticate.multi:Status checker returns False
DEBUG:authkit.authenticate.multi:Multi: No binding was found for the check
DEBUG:authkit.authenticate.cookie:These cookies were found: []
DEBUG:authkit.authenticate.cookie:Our cookie 'authkit' value is therefore ''
DEBUG:authkit.authenticate.cookie:Remote addr '***.***.***.***', value '', include_ip True
DEBUG:pylons.wsgiapp:Setting up Pylons stacked object globals
DEBUG:pylons.wsgiapp:Resolved URL to controller: u'error'
DEBUG:pylons.wsgiapp:Found controller, module: 'linkdb.controllers.error', class: 'ErrorController'
DEBUG:pylons.wsgiapp:Controller appears to be a class, instantiating
DEBUG:pylons.wsgiapp:Calling controller class with WSGI interface

UPDATE: This is the fcgi script my app is using

#!/usr/bin/env python
import logging
# Load the WSGI application from the config file
from paste.deploy import loadapp
wsgi_app = loadapp('config:/var/www/linkdb/production.ini')

# Deploy it using FastCGI
if __name__ == '__main__':
    logging.basicConfig(filename='/var/www/linkdb/error.log', level=logging.DEBUG)
    from flup.server.fcgi import WSGIServer
    WSGIServer(wsgi_app).run()

We have a pylons web application running on a windows server 2003 machine.

There is a startup script that runs in a "dos box".

From time to time the script crashes and the server is then down. How to keep it runing / monitored?

Edit: On a linux box I would use a monitoring tool like "monit" that can check if the service responds to http requests and kills it and starts a new instance if not.

Edit2: After some research I found something now:

http://www.google.de/search?q=http%3A%2F%2Fwiki.pylonshq.com%2Fdisplay%2Fpylonscookbook%2FHow%2Bto%2Brun%2BPylons%2Bas%2Ba%2BWindows%2Bservice

(the original site is down at the present, but google cache has the page: http://wiki.pylonshq.com/display/pylonscookbook/How+to+run+Pylons+as+a+Windows+service )

I found the link on http://pylonsbook.com/en/1.1/deployment.html (2nd paragraph from the bottom)