If you install openstack by devstack, when you reboot your server and restart the openstack by this script http://www.scalegrid.net/blog/?p=52, when you browse to the dashboard and you will see this error message “HTTPConnectionPool(host=’192.168.100.170′, port=8776): Max retries exceeded with url: /v1/b721f5b1f7cd43dd83ee573f6d4e6c74/os-quota-sets/b721f5b1f7cd43dd83ee573f6d4e6c74 (Caused by <class ‘socket.error’>: [Errno 111] Connection refused)”
You should check with your endpoints server by command : keystone endpoint-list
You will see the url “/v1/b721f5b1f7cd43dd83ee573f6d4e6 in the error message is from the port 8776, and port 8776 is cinder service, so all you need to do is start cinder manually by
cd /opt/stack/cinder/bin ./cinder-api
After that, your dashboard will be fine
