部署过程中，使用虚环境，但是启动程序的时候报错，如下：
Traceback (most recent call last):
File "/home/himalayas/fdsearch/fdsearch/bin/fdsearch", line 34, in <module>
from fdsearch import wsgi
File "/home/himalayas/fdsearch/fdsearch/wsgi.py", line 32, in <module>
import fdsearch.domain
File "/home/himalayas/fdsearch/fdsearch/domain/__init__.py", line 20, in <module>
from notify_handler import NotifyHandler
File "/home/himalayas/fdsearch/fdsearch/domain/notify_handler.py", line 23, in <module>
from cjson import encode as json_encode
File "build/bdist.linux-x86_64/egg/cjson.py", line 7, in <module>
File "build/bdist.linux-x86_64/egg/cjson.py", line 4, in __bootstrap__
File "/home/himalayas/virtualenv/python2.7-fd/lib/python2.7/site-packages/pkg_resources.py", line 945, in resource_filename
self, resource_name
File "/home/himalayas/virtualenv/python2.7-fd/lib/python2.7/site-packages/pkg_resources.py", line 1633, in get_resource_filename
self._extract_resource(manager, self._eager_to_zip(name))
File "/home/himalayas/virtualenv/python2.7-fd/lib/python2.7/site-packages/pkg_resources.py", line 1661, in _extract_resource
self.egg_name, self._parts(zip_path)
File "/home/himalayas/virtualenv/python2.7-fd/lib/python2.7/site-packages/pkg_resources.py", line 1025, in get_cache_path
self.extraction_error()
File "/home/himalayas/virtualenv/python2.7-fd/lib/python2.7/site-packages/pkg_resources.py", line 991, in extraction_error
raise err
pkg_resources.ExtractionError: Can't extract file(s) to egg cache
The following error occurred while trying to extract file(s) to the Python egg
cache:
[Errno 13] Permission denied: '/root/.python-eggs'
The Python egg cache directory is currently set to:
/root/.python-eggs
解决办法：让开发在代码中声明一下环境变量。
export PYTHON_EGG_CACHE=/some/other/dir
注意：在系统的/etc/profile中声明是没有办法的，因为程序是在虚环境中运行。
本文转自Tenderrain 51CTO博客，原文链接：http://blog.51cto.com/tenderrain/1670301，如需转载请自行联系原作者
