Open Stack

I have installed openstack with devstack.It can run now.
Then I want to change the hypervisor to lxc.

I replace /etc/nova/nova.conf
>libvirt_type=lxc

add a line in /etc/nova/nova.conf
connection_type=libvirt


then "apt-get install nova-compute-lxc"


"""
Configuration file `/etc/nova/api-paste.ini'
 ==> File on system created by you or by a script.
 ==> File also in package provided by package maintainer.
   What would you like to do about it ?  Your options are:
    Y or I  : install the package maintainer's version
    N or O  : keep your currently-installed version
      D     : show the differences between the versions
      Z     : start a shell to examine the situation
 The default action is to keep your current version.
*** api-paste.ini (Y/I/N/O/D/Z) [default=N] ? d

Configuration file `/etc/nova/api-paste.ini'
 ==> File on system created by you or by a script.
 ==> File also in package provided by package maintainer.
   What would you like to do about it ?  Your options are:
    Y or I  : install the package maintainer's version
    N or O  : keep your currently-installed version
      D     : show the differences between the versions
      Z     : start a shell to examine the situation
 The default action is to keep your current version.
*** api-paste.ini (Y/I/N/O/D/Z) [default=N] ? y
Installing new version of config file /etc/nova/api-paste.ini ...

Configuration file `/etc/nova/policy.json'
 ==> File on system created by you or by a script.
 ==> File also in package provided by package maintainer.
   What would you like to do about it ?  Your options are:
    Y or I  : install the package maintainer's version
    N or O  : keep your currently-installed version
      D     : show the differences between the versions
      Z     : start a shell to examine the situation
 The default action is to keep your current version.
*** policy.json (Y/I/N/O/D/Z) [default=N] ? y
Installing new version of config file /etc/nova/policy.json ...

Configuration file `/etc/nova/nova.conf'
 ==> File on system created by you or by a script.
 ==> File also in package provided by package maintainer.
   What would you like to do about it ?  Your options are:
    Y or I  : install the package maintainer's version
    N or O  : keep your currently-installed version
      D     : show the differences between the versions
      Z     : start a shell to examine the situation
 The default action is to keep your current version.
*** nova.conf (Y/I/N/O/D/Z) [default=N] ? y
Installing new version of config file /etc/nova/nova.conf ...

"""


but error:

Not creating home directory `/var/lib/nova'.
usermod: no changes
Traceback (most recent call last):
  File "/usr/local/bin/nova-manage", line 7, in <module>
    execfile(__file__)
  File "/opt/stack/nova/bin/nova-manage", line 1336, in <module>
    main()
  File "/opt/stack/nova/bin/nova-manage", line 1243, in main
    argv = flags.parse_args(sys.argv)
  File "/opt/stack/nova/nova/flags.py", line 43, in parse_args
    default_config_files=default_config_files)
  File "/opt/stack/nova/nova/openstack/common/cfg.py", line 1026, in
__call__
    self._parse_config_files()
  File "/opt/stack/nova/nova/openstack/common/cfg.py", line 1492, in
_parse_config_files
    raise ConfigFileParseError(pe.filename, str(pe))
nova.openstack.common.cfg.ConfigFileParseError: Failed to parse
/etc/nova/nova.conf: at /etc/nova/nova.conf:2, Section must be started
before assignment: None


No apport report written because the error message indicates its a followup
error from a previous failure.

No apport report written because the error message indicates its a followup
error from a previous failure.
                                              Errors were encountered while
processing:
 nova-common
 nova-compute
 nova-compute-lxc


what can I do now?


system:ubuntu 12.04 x64

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