As suggested in the referenced email, have you checked your logs? Additionally check to be sure that your MySQL connection information is correct and that MySQL is bound to the IP address that resolves to "controller" as you have in your connection string. Hopefully some of this helps you get to a resolution. Kind regards, Melvin Hillsman On Jul 31, 2016, at 6:46 PM, 张余歌 <patrickstar12358 at hotmail.com> wrote: My error is the same as this link: http://lists.openstack.org/pipermail/openstack-operators/2016-March/009821.html But I can't solve this problem,have somebody know how to solve?thanks a lot 從我的 Windows Phone 寄出 _______________________________________________ OpenStack-operators mailing list OpenStack-operators at lists.openstack.org http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-operators -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.openstack.org/pipermail/openstack-operators/attachments/20160731/418374f1/attachment.html>