nova liberty

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nova liberty 版本中 修改 admin passowd 的流程分析

在nova 的liberty 版本中 修改 admin password 的方法和线上产品修改passowd 的方法

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  def set_admin_password(self, context, instance, new_pass):
      """Set the root/admin password for an instance on this host.

      This is generally only called by API password resets after an
      image has been built.

      @param context: Nova auth context.
      @param instance: Nova instance object.
      @param new_pass: The admin password for the instance.
      """

      import pdb;pdb.set_trace()
      context = context.elevated()
      if new_pass is None:
          # Generate a random password
          new_pass = utils.generate_password()

      current_power_state = self._get_power_state(context, instance)
      expected_state = power_state.RUNNING

      if current_power_state != expected_state:
          instance.task_state = None
          instance.save(expected_task_state=task_states.UPDATING_PASSWORD)
          _msg = _('instance %s is not running') % instance.uuid
          raise exception.InstancePasswordSetFailed(
              instance=instance.uuid, reason=_msg)

      try:
          self.driver.set_admin_password(instance, new_pass)
          LOG.info(_LI("Root password set"), instance=instance)
          instance.task_state = None
          instance.save(
              expected_task_state=task_states.UPDATING_PASSWORD)
      except NotImplementedError:
          LOG.warning(_LW('set_admin_password is not implemented '
                          'by this driver or guest instance.'),
                      instance=instance)
          instance.task_state = None
          instance.save(
              expected_task_state=task_states.UPDATING_PASSWORD)
          raise NotImplementedError(_('set_admin_password is not '
                                      'implemented by this driver or guest '
                                      'instance.'))
              except exception.UnexpectedTaskStateError:
          # interrupted by another (most likely delete) task
          # do not retry
          raise
      except Exception:
          # Catch all here because this could be anything.
          LOG.exception(_LE('set_admin_password failed'),
                        instance=instance)
          self._set_instance_obj_error_state(context, instance)
          # We create a new exception here so that we won't
          # potentially reveal password information to the
          # API caller.  The real exception is logged above
          _msg = _('error setting admin password')
          raise exception.InstancePasswordSetFailed(
              instance=instance.uuid, reason=_msg)

总结： 
   在openstack L 版本中 libvirt >= 1.2.16 就已经实现了 qemu set_admin_password 的功能
   注意： vm 必须是running 状态。
   线上的实现方法是： 利用 libvirt_qemu 模块进行命令修改。