web.py + lighttpd + matplotlib不能正常工作

时间:2010-12-24 00:34:10

标签: python matplotlib lighttpd web.py

我尝试使用lighttpd部署我的web.py应用。如果导入matplotlib,它不起作用。

这有效......

hello.py:

#!/usr/bin/python

import web

# Say hello.
class Index:
    def GET(self): return 'hello web.py'
if __name__ == "__main__":
    app = web.application(('/*', 'Index'), globals())
    app.run()

/etc/init.d/lighttpd restart

我访问我的网站,看看"你好web.py"。

但是,如果我将import matplotlib添加到hello.py并重新启动服务器,那么当我访问该站点时,我会收到500 - 内部服务器错误。

此处/var/log/lighttpd/error.log

2010-12-24 00:17:31: (log.c.166) server started
2010-12-24 00:17:42: (mod_fastcgi.c.1734) connect failed: Connection refused on
unix:/tmp/fastcgi.socket-0
2010-12-24 00:17:42: (mod_fastcgi.c.3037) backend died; we'll disable it for 1 s
econds and send the request to another backend instead: reconnects: 0 load: 1
2010-12-24 00:17:43: (mod_fastcgi.c.2582) unexpected end-of-file (perhaps the fa
stcgi process died): pid: 4074 socket: unix:/tmp/fastcgi.socket-0
2010-12-24 00:17:43: (mod_fastcgi.c.3320) child exited, pid: 4074 status: 1
2010-12-24 00:17:43: (mod_fastcgi.c.3367) response not received, request sent: 9
53 on socket: unix:/tmp/fastcgi.socket-0 for /hello.py?, closing connection
2010-12-24 00:20:30: (server.c.1503) server stopped by UID = 0 PID = 4095
2010-12-24 00:20:30: (log.c.166) server started

- 编辑 -

这是我的lighttpd.conf:http://pastebin.com/n6sG5z9K

非常确定它只是默认设置(除了我设置server.document-root = "/var/www/hello/"

这是我的fastcgi.conf:

server.modules   += ( "mod_fastcgi" )
server.modules   += ( "mod_rewrite" )

fastcgi.server = ( "/hello.py" =>
 (( "socket" => "/tmp/fastcgi.socket",
    "bin-path" => "/usr/bin/python /var/www/hello/hello.py",
    "max-procs" => 1,
   "bin-environment" => (
     "REAL_SCRIPT_NAME" => ""
   ),
   "check-local" => "disable"
 ))
 )

url.rewrite-once = (
   "^/favicon.ico$" => "/static/favicon.ico",
   "^/static/(.*)$" => "/static/$1",
   "^/(.*)$" => "/hello.py/$1",
 )

有什么建议吗?

4 个答案:

答案 0 :(得分:2)

今天偶然发现(使用Apache,但它可能是完全相同的问题)。我从脚本重定向stdout和stderr以查看发生了什么,问题是matplotlib正在尝试创建文件:

Traceback (most recent call last):
  File "/home/ec2-user/dlea/src/dla.py", line 24, in <module>
    import dbm
  File "/home/ec2-user/dlea/src/dbm.py", line 7, in <module>
    import matplotlib
  File "/usr/lib64/python2.6/site-packages/matplotlib/__init__.py", line 709, in <module>
    rcParams = rc_params()
  File "/usr/lib64/python2.6/site-packages/matplotlib/__init__.py", line 627, in rc_params
    fname = matplotlib_fname()
  File "/usr/lib64/python2.6/site-packages/matplotlib/__init__.py", line 565, in matplotlib_fname
    fname = os.path.join(get_configdir(), 'matplotlibrc')
  File "/usr/lib64/python2.6/site-packages/matplotlib/__init__.py", line 240, in wrapper
    ret = func(*args, **kwargs)
  File "/usr/lib64/python2.6/site-packages/matplotlib/__init__.py", line 439, in _get_configdir
    raise RuntimeError("Failed to create %s/.matplotlib; consider setting MPLCONFIGDIR to a writable directory for matplotlib configuration data"%h)
RuntimeError: Failed to create /var/www/.matplotlib; consider setting MPLCONFIGDIR to a writable directory for matplotlib configuration data

由于它以用户httpd(Apache)的形式运行,因此它尝试在/ var / www /中创建文件,该文件是root用户,而不是Apache用户可写的。

一个有效的解决方案就像在导入matplotlib之前将MPLCONFIGDIR设置为临时目录一样简单:

import os
import tempfile
os.environ['MPLCONFIGDIR'] = tempfile.mkdtemp()
import matplotlib

为了跟踪问题,我将stdout和stderr重定向到某个日志文件以查看发生的情况:

sys.stdout = open("/var/log/dla_stdout.txt", 'a')
sys.stderr = open("/var/log/dla_stderr.txt", 'a')

我实际上从其他StackOverflow问题得到了解决方案:Setting Matplotlib MPLCONFIGDIR: consider setting MPLCONFIGDIR to a writable directory for matplotlib configuration data

答案 1 :(得分:1)

我正在遵循这个食谱:http://webpy.org/cookbook/fastcgi-lighttpd

我忽略了此主题顶部的链接:http://www.mail-archive.com/webpy@googlegroups.com/msg02800.html

该线程有解决方案。我像这样运行python进程:

/var/www/hello.py fastcgi 9080

然后像我这样设置我的fastcgi.conf

 fastcgi.server = ( "/hello.py" =>
     ((
        "host" => "127.0.0.1",
        "port" => 9080,
        "check-local" => "disable"
    ))
 )

然后它有效。 (仍然不确定我是否已正确配置所有内容,但似乎正在运行。)

答案 2 :(得分:1)

我解决了这个问题:

pip install flup

不需要

/var/www/hello.py fastcgi 9080

我的系统是:amazon ec2,ubuntu 10.04
lighttpd:1.4.26

答案 3 :(得分:0)

我的第一个猜测是,您收到了ImportError,因为matplotlib未正确安装或不在PYTHONPATH或其他一些疯狂的事情上。确切知道的唯一方法是查看追溯。它显示你正在运行fastcgi,这意味着python代码正在另一个进程中执行。因此,您无法在lighttpd日志中找到回溯。

你是如何运行fastcgi进程的?回溯本应写入其stderr。您也可以考虑使用supervisord。它支持将stderr重定向到日志文件以及其他各种使得创建守护进程更容易的事情。