Comment 0 for bug 1439869

When attempting to attach an encrypted iSCSI volume to an instance with iscsi_use_multipath set to True in nova.conf an error occurs in n-cpu.

The devstack system being used had the following nova version:

commit ab25f5f34b6ee37e495aa338aeb90b914f622b9d
Merge "instance termination with update_dns_entries set fails"

The following error occurs in n-cpu:

Stack Trace:

2015-04-02 13:46:22.641 ERROR nova.virt.block_device [req-61f49ff8-b814-42c0-8cf8-ffe7b6a3561c admin admin] [instance: 41d0c192-a1ce-45eb-a5ff-bcb96ec0d8e5] Driver failed to attach volume 4778e71c-a1b5-4d
b5-b677-1d8191468e87 at /dev/vdb
2015-04-02 13:46:22.641 TRACE nova.virt.block_device [instance: 41d0c192-a1ce-45eb-a5ff-bcb96ec0d8e5] Traceback (most recent call last):
2015-04-02 13:46:22.641 TRACE nova.virt.block_device [instance: 41d0c192-a1ce-45eb-a5ff-bcb96ec0d8e5] File "/opt/stack/nova/nova/virt/block_device.py", line 251, in attach
2015-04-02 13:46:22.641 TRACE nova.virt.block_device [instance: 41d0c192-a1ce-45eb-a5ff-bcb96ec0d8e5] device_type=self['device_type'], encryption=encryption)
2015-04-02 13:46:22.641 TRACE nova.virt.block_device [instance: 41d0c192-a1ce-45eb-a5ff-bcb96ec0d8e5] File "/opt/stack/nova/nova/virt/libvirt/driver.py", line 1064, in attach_volume
2015-04-02 13:46:22.641 TRACE nova.virt.block_device [instance: 41d0c192-a1ce-45eb-a5ff-bcb96ec0d8e5] self._disconnect_volume(connection_info, disk_dev)
2015-04-02 13:46:22.641 TRACE nova.virt.block_device [instance: 41d0c192-a1ce-45eb-a5ff-bcb96ec0d8e5] File "/usr/local/lib/python2.7/dist-packages/oslo_utils/excutils.py", line 85, in __exit__
2015-04-02 13:46:22.641 TRACE nova.virt.block_device [instance: 41d0c192-a1ce-45eb-a5ff-bcb96ec0d8e5] six.reraise(self.type_, self.value, self.tb)
2015-04-02 13:46:22.641 TRACE nova.virt.block_device [instance: 41d0c192-a1ce-45eb-a5ff-bcb96ec0d8e5] File "/opt/stack/nova/nova/virt/libvirt/driver.py", line 1051, in attach_volume
2015-04-02 13:46:22.641 TRACE nova.virt.block_device [instance: 41d0c192-a1ce-45eb-a5ff-bcb96ec0d8e5] encryptor.attach_volume(context, **encryption)
2015-04-02 13:46:22.641 TRACE nova.virt.block_device [instance: 41d0c192-a1ce-45eb-a5ff-bcb96ec0d8e5] File "/opt/stack/nova/nova/volume/encryptors/cryptsetup.py", line 93, in attach_volume
2015-04-02 13:46:22.641 TRACE nova.virt.block_device [instance: 41d0c192-a1ce-45eb-a5ff-bcb96ec0d8e5] self._open_volume(passphrase, **kwargs)
2015-04-02 13:46:22.641 TRACE nova.virt.block_device [instance: 41d0c192-a1ce-45eb-a5ff-bcb96ec0d8e5] File "/opt/stack/nova/nova/volume/encryptors/cryptsetup.py", line 78, in _open_volume
2015-04-02 13:46:22.641 TRACE nova.virt.block_device [instance: 41d0c192-a1ce-45eb-a5ff-bcb96ec0d8e5] check_exit_code=True, run_as_root=True)
2015-04-02 13:46:22.641 TRACE nova.virt.block_device [instance: 41d0c192-a1ce-45eb-a5ff-bcb96ec0d8e5] File "/opt/stack/nova/nova/utils.py", line 206, in execute
2015-04-02 13:46:22.641 TRACE nova.virt.block_device [instance: 41d0c192-a1ce-45eb-a5ff-bcb96ec0d8e5] return processutils.execute(*cmd, **kwargs)
2015-04-02 13:46:22.641 TRACE nova.virt.block_device [instance: 41d0c192-a1ce-45eb-a5ff-bcb96ec0d8e5] File "/usr/local/lib/python2.7/dist-packages/oslo_concurrency/processutils.py", line 233, in execute
2015-04-02 13:46:22.641 TRACE nova.virt.block_device [instance: 41d0c192-a1ce-45eb-a5ff-bcb96ec0d8e5] cmd=sanitized_cmd)
2015-04-02 13:46:22.641 TRACE nova.virt.block_device [instance: 41d0c192-a1ce-45eb-a5ff-bcb96ec0d8e5] ProcessExecutionError: Unexpected error while running command.
2015-04-02 13:46:22.641 TRACE nova.virt.block_device [instance: 41d0c192-a1ce-45eb-a5ff-bcb96ec0d8e5] Command: sudo nova-rootwrap /etc/nova/rootwrap.conf cryptsetup create --key-file=- 36000eb37601bcf0200
0000000000036c /dev/mapper/36000eb37601bcf02000000000000036c
2015-04-02 13:46:22.641 TRACE nova.virt.block_device [instance: 41d0c192-a1ce-45eb-a5ff-bcb96ec0d8e5] Exit code: 1
2015-04-02 13:46:22.641 TRACE nova.virt.block_device [instance: 41d0c192-a1ce-45eb-a5ff-bcb96ec0d8e5] Stdout: u''
2015-04-02 13:46:22.641 TRACE nova.virt.block_device [instance: 41d0c192-a1ce-45eb-a5ff-bcb96ec0d8e5] Stderr: u''
2015-04-02 13:46:22.641 TRACE nova.virt.block_device [instance: 41d0c192-a1ce-45eb-a5ff-bcb96ec0d8e5]

multipath-tools was installed
iscsi_use_multipath = True was set under the [libvirt] entry in nova.conf

To reproduce:

install multipath-tools
set iscsi_use_multipath to True in nova.conf under the [libvirt] section.
create an encrypted iSCSI volume and attempt to attach it to an instance (I was using CryptsetupEncryptor).

The above error will occur in n-cpu.