openstack-nova-compute服务起不来

# systemctl status openstack-nova-compute.service
openstack-nova-compute.service - OpenStack Nova Compute Server
   Loaded: loaded (/usr/lib/systemd/system/openstack-nova-compute.service; enabled)
   Active: activating (start) since 三 2015-04-15 14:16:19 CST; 24s ago
Main PID: 4852 (nova-compute)
   CGroup: /system.slice/openstack-nova-compute.service
           └─4852 /usr/bin/python /usr/bin/nova-compute

4月 15 14:16:19 computer-node1 systemd[1]: openstack-nova-compute.service holdoff time over, scheduling restart.
4月 15 14:16:19 computer-node1 systemd[1]: Stopping OpenStack Nova Compute Server...
4月 15 14:16:19 computer-node1 systemd[1]: Starting OpenStack Nova Compute Server...


# journalctl -xn
-- Logs begin at 三 2015-04-15 10:40:12 CST, end at 三 2015-04-15 14:16:19 CST. --
4月 15 14:14:48 computer-node1 systemd[1]: Unit openstack-nova-compute.service entered failed state.
4月 15 14:14:49 computer-node1 systemd[1]: openstack-nova-compute.service holdoff time over, scheduling restart.
4月 15 14:14:49 computer-node1 systemd[1]: Stopping OpenStack Nova Compute Server...
-- Subject: Unit openstack-nova-compute.service has begun shutting down
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
--
-- Unit openstack-nova-compute.service has begun shutting down.
4月 15 14:14:49 computer-node1 systemd[1]: Starting OpenStack Nova Compute Server...
-- Subject: Unit openstack-nova-compute.service has begun with start-up
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
--
-- Unit openstack-nova-compute.service has begun starting up.
4月 15 14:16:19 computer-node1 systemd[1]: openstack-nova-compute.service operation timed out. Terminating.
4月 15 14:16:19 computer-node1 systemd[1]: Failed to start OpenStack Nova Compute Server.
-- Subject: Unit openstack-nova-compute.service has failed
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
--
-- Unit openstack-nova-compute.service has failed.
--
-- The result is failed.
4月 15 14:16:19 computer-node1 systemd[1]: Unit openstack-nova-compute.service entered failed state.
4月 15 14:16:19 computer-node1 systemd[1]: openstack-nova-compute.service holdoff time over, scheduling restart.
4月 15 14:16:19 computer-node1 systemd[1]: Stopping OpenStack Nova Compute Server...
-- Subject: Unit openstack-nova-compute.service has begun shutting down
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
--
-- Unit openstack-nova-compute.service has begun shutting down.
4月 15 14:16:19 computer-node1 systemd[1]: Starting OpenStack Nova Compute Server...
-- Subject: Unit openstack-nova-compute.service has begun with start-up
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
--
-- Unit openstack-nova-compute.service has begun starting up.收起