我有一个我已经使用了一段时间的 devstack 环境（安装在 Ubuntu 14.04.1 LTS 上）。
运行stack.sh脚本时开始出现此错误
错误：openstack 身份验证失败：意外错误阻止服务器满足您的请求：没有名为 backends.sql 的模块（禁用调试模式以抑制这些详细信息。）（HTTP 500）
我尝试过的事情。
- 重新启动 devstack 虚拟机
- 重新安装mysql服务器
- 克隆 devstack 的新副本以运行新的代码副本
请注意，我可以使用我在 local.conf 中的凭据登录 MySQL，并且在过去的几个月中，相同的配置一直有效
如果需要任何其他信息，请告诉我。
更详细的日志：
2014-12-18 22:28:13.530 | ++ ENABLED_SERVICES=g-api,g-reg,key,n-api,n-crt,n-obj,n-cpu,n-net,n-cond,n-sch,n-novnc,n-xvnc,n-cauth,c-sch,c-api,c-vol,h-eng,h-api,h-api-cfn,h-api-cw,horizon,rabbit,tempest,mysql,ceilometer-acompute,ceilometer-acentral,ceilometer-anotification,ceilometer-collector,ceilometer-alarm-evaluator,ceilometer-alarm-notifier,ceilometer-api
2014-12-18 22:28:13.530 | ++ is_service_enabled gantt
2014-12-18 22:28:13.533 | ++ return 1
2014-12-18 22:28:13.533 | + for i in '$TOP_DIR/extras.d/*.sh'
2014-12-18 22:28:13.534 | + [[ -r /home/hellraiser/newicehouse/extras.d/70-marconi.sh ]]
2014-12-18 22:28:13.534 | + source /home/hellraiser/newicehouse/extras.d/70-marconi.sh stack post-config
2014-12-18 22:28:13.534 | ++ is_service_enabled marconi-server
2014-12-18 22:28:13.536 | ++ return 1
2014-12-18 22:28:13.536 | + for i in '$TOP_DIR/extras.d/*.sh'
2014-12-18 22:28:13.536 | + [[ -r /home/hellraiser/newicehouse/extras.d/70-sahara.sh ]]
2014-12-18 22:28:13.536 | + source /home/hellraiser/newicehouse/extras.d/70-sahara.sh stack post-config
2014-12-18 22:28:13.536 | ++ is_service_enabled sahara
2014-12-18 22:28:13.539 | ++ return 1
2014-12-18 22:28:13.540 | + for i in '$TOP_DIR/extras.d/*.sh'
2014-12-18 22:28:13.540 | + [[ -r /home/hellraiser/newicehouse/extras.d/70-trove.sh ]]
2014-12-18 22:28:13.540 | + source /home/hellraiser/newicehouse/extras.d/70-trove.sh stack post-config
2014-12-18 22:28:13.540 | ++ is_service_enabled trove
2014-12-18 22:28:13.543 | ++ return 1
2014-12-18 22:28:13.543 | + for i in '$TOP_DIR/extras.d/*.sh'
2014-12-18 22:28:13.543 | + [[ -r /home/hellraiser/newicehouse/extras.d/80-opendaylight.sh ]]
2014-12-18 22:28:13.543 | + source /home/hellraiser/newicehouse/extras.d/80-opendaylight.sh stack post-config
2014-12-18 22:28:13.543 | ++ is_service_enabled odl-server odl-compute
2014-12-18 22:28:13.546 | ++ return 1
2014-12-18 22:28:13.546 | ++ is_service_enabled odl-server
2014-12-18 22:28:13.549 | ++ return 1
2014-12-18 22:28:13.549 | ++ is_service_enabled odl-compute
2014-12-18 22:28:13.552 | ++ return 1
2014-12-18 22:28:13.552 | + for i in '$TOP_DIR/extras.d/*.sh'
2014-12-18 22:28:13.553 | + [[ -r /home/hellraiser/newicehouse/extras.d/80-tempest.sh ]]
2014-12-18 22:28:13.553 | + source /home/hellraiser/newicehouse/extras.d/80-tempest.sh stack post-config
2014-12-18 22:28:13.553 | ++ is_service_enabled tempest
2014-12-18 22:28:13.555 | ++ return 0
2014-12-18 22:28:13.555 | ++ [[ stack == \s\o\u\r\c\e ]]
2014-12-18 22:28:13.555 | ++ [[ stack == \s\t\a\c\k ]]
2014-12-18 22:28:13.555 | ++ [[ post-config == \i\n\s\t\a\l\l ]]
2014-12-18 22:28:13.555 | ++ [[ stack == \s\t\a\c\k ]]
2014-12-18 22:28:13.555 | ++ [[ post-config == \p\o\s\t\-\c\o\n\f\i\g ]]
2014-12-18 22:28:13.555 | ++ create_tempest_accounts
2014-12-18 22:28:13.555 | ++ is_service_enabled tempest
2014-12-18 22:28:13.558 | ++ return 0
2014-12-18 22:28:13.558 | ++ openstack project create alt_demo
2014-12-18 22:28:14.181 | ERROR: openstack Authentication failure: An unexpected error prevented the server from fulfilling your request: No module named backends.sql (Disable debug mode to suppress these details.) (HTTP 500)
2014-12-18 22:28:14.212 | + exit_trap
2014-12-18 22:28:14.213 | + local r=1
2014-12-18 22:28:14.213 | ++ jobs -p
2014-12-18 22:28:14.214 | + jobs=