最近研究openstack，想把自己遇到的问题记录下来，同时如果有别的朋友也碰到同样问题的时候可以有个参考。
这次的问题是在openstack搭建好之后，dashboard本身是能用的，但是在某一天后，突然发现打开dashboard后出现Internal Server Error. 于是乎在网上找答案但是没有，那就自己动手解决吧。
首先打开dashboard的log文件，我的是：~/log/horizon.log.
发现下面的error 信息：
-- ::55.380169 Traceback (most recent call last):
-- ::55.380313 File "/opt/stack/horizon/openstack_dashboard/wsgi/django.wsgi", line , in <module>
-- ::55.380466 application = get_wsgi_application()
-- ::55.380557 File "/usr/local/lib/python2.7/dist-packages/django/core/wsgi.py", line , in get_wsgi_application
-- ::55.380659 django.setup()
-- ::55.380740 File "/usr/local/lib/python2.7/dist-packages/django/__init__.py", line , in setup
-- ::55.380837 configure_logging(settings.LOGGING_CONFIG, settings.LOGGING)
-- ::55.380939 File "/usr/local/lib/python2.7/dist-packages/django/conf/__init__.py", line , in __getattr__
-- ::55.381056 self._setup(name)
-- ::55.381140 File "/usr/local/lib/python2.7/dist-packages/django/conf/__init__.py", line , in _setup
-- ::55.381250 self._wrapped = Settings(settings_module)
-- ::55.381337 File "/usr/local/lib/python2.7/dist-packages/django/conf/__init__.py", line , in __init__
-- ::55.381435 mod = importlib.import_module(self.SETTINGS_MODULE)
-- ::55.381518 File "/usr/lib/python2.7/importlib/__init__.py", line , in import_module
-- ::55.381665 __import__(name)
-- ::55.381751 File "/opt/stack/horizon/openstack_dashboard/wsgi/../../openstack_dashboard/settings.py", line , in <module>
-- ::55.381886 from local.local_settings import * # noqa
-- ::55.381977 File "/opt/stack/horizon/openstack_dashboard/wsgi/../../openstack_dashboard/local/local_settings.py", line , in <module>
-- ::55.382078 os.path.join(LOCAL_PATH, '.secret_key_store'))
-- ::55.382174 File "/opt/stack/horizon/openstack_dashboard/wsgi/../../horizon/utils/secret_key.py", line , in generate_or_read_from_file
-- ::55.382377 raise FilePermissionError("Insecure key file permissions!")
-- ::55.382494 FilePermissionError: Insecure key file permissions!
初步判断是文件的权限问题，根据os.path.join(LOCAL_PATH, '.secret_key_store') 找到/opt/stack/horizon/openstack_dashboard/local/.secret_key_store, 并发现对这个文件拥有所有的权限，很奇怪为啥会出现permission的问题
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登陆到另外一台dashboard正常work的机器上发现
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然后决定删除这两个文件，再次刷新dashboard的url,很神奇的是work了，同时也发现该目录下新产生了这两个文件，并且权限和上图一样。
这个问题误打误撞的解决了，但是在操作openstack过程中发现openstack很不稳定，有的功能开始是好的，过一两天就不好用了，或是装一个东西怎么也装不上，然后多重装几次就好了，还是不明白其中的原因，但是要多学习，多探索！ ^_^