OpenStack实例无法获取固定公网IP且元数据访问失败问题求助

大家好，我目前已经搭建好OpenStack环境并配置了公网，现在能正常给路由器绑定浮动IP和外部网关，其他功能看起来都运转正常，但在启动带有固定公网IP的实例时遇到了问题。

启动实例过程中，这段日志内容引起了我的注意：

checking http://169.254.169.254/2009-04-04/instance-id
failed 1/20: up 182.35. request failed
failed 2/20: up 184.36. request failed
failed 3/20: up 186.36. request failed
failed 4/20: up 188.37. request failed
failed 5/20: up 190.37. request failed
failed 6/20: up 192.38. request failed
failed 7/20: up 194.38. request failed
failed 8/20: up 196.39. request failed
failed 9/20: up 198.40. request failed
failed 10/20: up 200.40. request failed
failed 11/20: up 202.41. request failed
failed 12/20: up 204.41. request failed
failed 13/20: up 206.42. request failed
failed 14/20: up 208.42. request failed
failed 15/20: up 210.43. request failed
failed 16/20: up 212.43. request failed
failed 17/20: up 214.44. request failed
failed 18/20: up 216.45. request failed
failed 19/20: up 218.45. request failed
failed 20/20: up 220.46. request failed
failed to read iid from metadata. tried 20
failed to get instance-id of datasource
Top of dropbear init script
Starting dropbear sshd: failed to get instance-id of datasource

我尝试过添加config drive参数来启动实例，但问题依然存在。如果有大佬知道怎么解决这个问题，麻烦给我一些思路，非常感谢！

备注：内容来源于stack exchange，提问作者student0909