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when i attach volume to instance,got error VolumeBackendAPIException

I use openstack kilo,and my server is centos 7.1 64bit.I can start an instance,when I attach a volume(cinder) to my instacne,I have got error like this: image description Please who can tell me,what is the problem?And what should i do for troubleshooting? cinder.conf on block server: [DEFAULT] verbose = True rpc_backend=rabbit my_ip=XX.XX.XX.XX glance_host=controller auth_strategy=keystone enabled_backends=lvm iscsi_helper=tgtadm iscsi_protocol=iscsi volume_group=cinder-volumes volume_driver=cinder.volume.drivers.lvm.LVMVolumeDriver [BRCD_FABRIC_EXAMPLE] [CISCO_FABRIC_EXAMPLE] [database] connection = mysql://cinder:XXXXXX@controller/cinder [fc-zone-manager] [keymgr] [keystone_authtoken] auth_uri = http://controller:5000 auth_url = http://controller:35357 auth_plugin = password project_domain_id = default user_domain_id = default project_name = service username = cinder password = gTF3mWkQ [matchmaker_redis] [matchmaker_ring] [oslo_messaging_amqp] [oslo_messaging_qpid] [oslo_messaging_rabbit] rabbit_host=controller rabbit_userid=openstack rabbit_password=gTF3mWkQ [profiler] [oslo_concurrency] lock_path = /var/lock/cinder

when i attach volume to instance,got error VolumeBackendAPIException

I use openstack kilo,and my server is centos 7.1 64bit.I can start an instance,when I attach a volume(cinder) to my instacne,I have got error like this: image description Please who can tell me,what is the problem?And what should i do for troubleshooting? cinder.conf on block server: [DEFAULT] verbose = True rpc_backend=rabbit my_ip=XX.XX.XX.XX glance_host=controller auth_strategy=keystone enabled_backends=lvm iscsi_helper=tgtadm iscsi_protocol=iscsi volume_group=cinder-volumes volume_driver=cinder.volume.drivers.lvm.LVMVolumeDriver [BRCD_FABRIC_EXAMPLE] [CISCO_FABRIC_EXAMPLE] [database] connection = mysql://cinder:XXXXXX@controller/cinder [fc-zone-manager] [keymgr] [keystone_authtoken] auth_uri = http://controller:5000 auth_url = http://controller:35357 auth_plugin = password project_domain_id = default user_domain_id = default project_name = service username = cinder password = gTF3mWkQ [matchmaker_redis] [matchmaker_ring] [oslo_messaging_amqp] [oslo_messaging_qpid] [oslo_messaging_rabbit] rabbit_host=controller rabbit_userid=openstack rabbit_password=gTF3mWkQ [profiler] [oslo_concurrency] lock_path = /var/lock/cinderimage description

when i attach volume to instance,got error VolumeBackendAPIException

I use openstack kilo,and my server is centos 7.1 64bit.I can start an instance,when I attach a volume(cinder) to my instacne,I have got error like this: image description Please who can tell me,what is the problem?And what should i do for troubleshooting? cinder.conf on block server: image descriptionimage description