代码追踪

首先我们给出函数的调用顺序图：

nova/api/openstack/compute/server.py: _action_reboot()
  nova/compute/api.py: reboot()
    nova/compute/api.py: _hard_reboot()
      nova/compute/rpcapi.py: reboot_instance()

--> RPC调用

nova/compute/manager.py: reboot_instance()
  nova/virt/libvirt/driver.py: reboot()
    nova/virt/libvirt/driver.py: _hard_reboot()
      nova/virt/libvirt/driver.py: _get_guest_xml()
      nova/virt/libvirt/driver.py: _create_domain_and_network()