openstack中dashboard页面RuntimeError: Unable to create a new session key. It is lik

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　　环境是centos7，直接跑在服务器上。
　　按照官网一步步安装openstack，到验证dashborad时出错。
　　登录http://192.168.1.73/dashboard ,输入域名，用户名，密码，出现错误，无法进入界面

　　tail -40 /etc/httpd/logs/error_log 查看打印
　　发现



[Sat Aug 12 19:42:16.701521 2017] [:error] [pid 10885] Could not process panel theme_preview: Dashboard with slug "developer" is not registered.
[Sat Aug 12 19:44:41.533207 2017] [:error] [pid 10885] Login successful for user "admin".
[Sat Aug 12 19:45:52.537140 2017] [:error] [pid 10885] Internal Server Error: /dashboard/auth/login/
[Sat Aug 12 19:45:52.556116 2017] [:error] [pid 10885] Traceback (most recent call last):
[Sat Aug 12 19:45:52.556129 2017] [:error] [pid 10885]   File "/usr/lib/python2.7/site-packages/django/core/handlers/base.py", line 223, in get_response
[Sat Aug 12 19:45:52.556135 2017] [:error] [pid 10885]     response = middleware_method(request, response)
[Sat Aug 12 19:45:52.556140 2017] [:error] [pid 10885]   File "/usr/lib/python2.7/site-packages/django/contrib/sessions/middleware.py", line 50, in process_response
[Sat Aug 12 19:45:52.556145 2017] [:error] [pid 10885]     request.session.save()
[Sat Aug 12 19:45:52.556148 2017] [:error] [pid 10885]   File "/usr/lib/python2.7/site-packages/django/contrib/sessions/backends/cache.py", line 53, in save
[Sat Aug 12 19:45:52.556153 2017] [:error] [pid 10885]     return self.create()
[Sat Aug 12 19:45:52.556157 2017] [:error] [pid 10885]   File "/usr/lib/python2.7/site-packages/django/contrib/sessions/backends/cache.py", line 48, in create
[Sat Aug 12 19:45:52.556180 2017] [:error] [pid 10885]     "Unable to create a new session key. "
[Sat Aug 12 19:45:52.556185 2017] [:error] [pid 10885] RuntimeError: Unable to create a new session key. It is likely that the cache is unavailable.
[Sat Aug 12 20:15:27.128247 2017] [:error] [pid 10885] Login successful for user "admin".
[Sat Aug 12 20:15:33.377599 2017] [:error] [pid 10885] Internal Server Error: /dashboard/auth/login/
[Sat Aug 12 20:15:33.377660 2017] [:error] [pid 10885] Traceback (most recent call last):
[Sat Aug 12 20:15:33.377665 2017] [:error] [pid 10885]   File "/usr/lib/python2.7/site-packages/django/core/handlers/base.py", line 132, in get_response
[Sat Aug 12 20:15:33.377668 2017] [:error] [pid 10885]     response = wrapped_callback(request, *callback_args, **callback_kwargs)
[Sat Aug 12 20:15:33.377671 2017] [:error] [pid 10885]   File "/usr/lib/python2.7/site-packages/django/views/decorators/debug.py", line 76, in sensitive_post_parameters_wrapper
[Sat Aug 12 20:15:33.377674 2017] [:error] [pid 10885]     return view(request, *args, **kwargs)
[Sat Aug 12 20:15:33.377677 2017] [:error] [pid 10885]   File "/usr/lib/python2.7/site-packages/django/utils/decorators.py", line 110, in _wrapped_view
[Sat Aug 12 20:15:33.377680 2017] [:error] [pid 10885]     response = view_func(request, *args, **kwargs)
[Sat Aug 12 20:15:33.377682 2017] [:error] [pid 10885]   File "/usr/lib/python2.7/site-packages/django/views/decorators/cache.py", line 57, in _wrapped_view_func
[Sat Aug 12 20:15:33.377685 2017] [:error] [pid 10885]     response = view_func(request, *args, **kwargs)
[Sat Aug 12 20:15:33.377688 2017] [:error] [pid 10885]   File "/usr/lib/python2.7/site-packages/openstack_auth/views.py", line 103, in login
[Sat Aug 12 20:15:33.377691 2017] [:error] [pid 10885]     **kwargs)
[Sat Aug 12 20:15:33.377694 2017] [:error] [pid 10885]   File "/usr/lib/python2.7/site-packages/django/views/decorators/debug.py", line 76, in sensitive_post_parameters_wrapper
[Sat Aug 12 20:15:33.377697 2017] [:error] [pid 10885]     return view(request, *args, **kwargs)
[Sat Aug 12 20:15:33.377699 2017] [:error] [pid 10885]   File "/usr/lib/python2.7/site-packages/django/utils/decorators.py", line 110, in _wrapped_view
[Sat Aug 12 20:15:33.377702 2017] [:error] [pid 10885]     response = view_func(request, *args, **kwargs)
[Sat Aug 12 20:15:33.377704 2017] [:error] [pid 10885]   File "/usr/lib/python2.7/site-packages/django/views/decorators/cache.py", line 57, in _wrapped_view_func
[Sat Aug 12 20:15:33.377707 2017] [:error] [pid 10885]     response = view_func(request, *args, **kwargs)
[Sat Aug 12 20:15:33.377709 2017] [:error] [pid 10885]   File "/usr/lib/python2.7/site-packages/django/contrib/auth/views.py", line 51, in login
[Sat Aug 12 20:15:33.377712 2017] [:error] [pid 10885]     auth_login(request, form.get_user())
[Sat Aug 12 20:15:33.377714 2017] [:error] [pid 10885]   File "/usr/lib/python2.7/site-packages/django/contrib/auth/__init__.py", line 110, in login
[Sat Aug 12 20:15:33.377717 2017] [:error] [pid 10885]     request.session.cycle_key()
[Sat Aug 12 20:15:33.377720 2017] [:error] [pid 10885]   File "/usr/lib/python2.7/site-packages/django/contrib/sessions/backends/base.py", line 285, in cycle_key
[Sat Aug 12 20:15:33.377723 2017] [:error] [pid 10885]     self.create()
[Sat Aug 12 20:15:33.377725 2017] [:error] [pid 10885]   File "/usr/lib/python2.7/site-packages/django/contrib/sessions/backends/cache.py", line 48, in create
[Sat Aug 12 20:15:33.377728 2017] [:error] [pid 10885]     "Unable to create a new session key. "
[Sat Aug 12 20:15:33.377730 2017] [:error] [pid 10885] RuntimeError: Unable to create a new session key. It is likely that the cache is unavailable.
　　意思大概是:
　　因为它周期性连接到非本地缓存有问题。官网写的有bug。
　　把/etc/openstack-dashboard/local_settings 中 SESSION_ENGINE = 'django.contrib.sessions.backends.cache' 应改为
SESSION_ENGINE = 'django.contrib.sessions.backends.file'
　　重启服务，然后重新登录成功。

systemctl restart httpd.service memcached.service