can't login openstack dashboard

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基于M版本的HA环境。

运行一段时间后（期间追加安装了不少服务：heat, aodh, ceilometer等）。突然发现无法登录dashboard了。

查看日志(/var/log/httpd/error.log)发现如下record

======

[Wed Jun 01 01:55:22.232869 2016] [:error] [pid 30560] Login successful for user "admin".
[Wed Jun 01 01:55:22.292997 2016] [:error] [pid 30560] Total Cookie size for user_id: ce6760c4525f4a0a8b8ac805a568d317 is 4248B >= 4093B. You need to configure file-based or database-backed sessions instead of cookie-based sessions: http://docs.openstack.org/developer/horizon/topics/deployment.html#session-storage
[Wed Jun 01 01:55:30.014698 2016] [:error] [pid 30560] Total Cookie size for user_id: ce6760c4525f4a0a8b8ac805a568d317 is 4193B >= 4093B. You need to configure file-based or database-backed sessions instead of cookie-based sessions: http://docs.openstack.org/developer/horizon/topics/deployment.html#session-storage

======

查看代码，发现是因为openstack返回给浏览器的cookie超过了最大值：

======

cat /usr/lib/python2.7/site-packages/horizon/middleware.py

max_cookie_size = getattr(
settings, 'SESSION_COOKIE_MAX_SIZE', None)
session_cookie_name = getattr(
settings, 'SESSION_COOKIE_NAME', None)
session_key = request.COOKIES.get(session_cookie_name)
if max_cookie_size is not None and session_key is not None:
cookie_size = sum((
len(key) + len(value)
for key, value in six.iteritems(request.COOKIES)
))
if cookie_size >= max_cookie_size:
LOG.error(
'Total Cookie size for user_id: %(user_id)s is '
'%(cookie_size)sB >= %(max_cookie_size)sB. '
'You need to configure file-based or database-backed '
'sessions instead of cookie-based sessions: '
'http://docs.openstack.org/developer/horizon/topics/'
'deployment.html#session-storage'
% {
'user_id': request.session.get(
'user_id', 'Unknown'),
'cookie_size': cookie_size,
'max_cookie_size': max_cookie_size,
}
)

================

第一想法是修改openstack设定的cookie max size。

后来查了资料，浏览器也是有cookie限制的（如下所示）

后来再请教大牛：浏览器cookie限制无法修改：那我改openstack有毛用。

老老实实把cookie改成数据库模式吧（后续分析）

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