老师：

       学生照您的demo在本地写了个ghost。但在docker-compose up 后运行始终存在如下错误，请问老师该如何解决？

ghost-app_1  | [2022-12-01 14:06:32] INFO Ctrl+C to shut down

ghost-app_1  | [2022-12-01 14:06:32] INFO Ghost server started in 4.359s

ghost-app_1  | [2022-12-01 14:06:32] ERROR connect ECONNREFUSED 127.0.0.1:3306

ghost-app_1  | 

ghost-app_1  | connect ECONNREFUSED 127.0.0.1:3306

ghost-app_1  | 

ghost-app_1  | "Unknown database error"

ghost-app_1  | 

ghost-app_1  | Error ID:

ghost-app_1  |     500

ghost-app_1  | 

ghost-app_1  | Error Code: 

ghost-app_1  |     ECONNREFUSED

ghost-app_1  | 

ghost-app_1  | ----------------------------------------

ghost-app_1  | 

ghost-app_1  | Error: connect ECONNREFUSED 127.0.0.1:3306

ghost-app_1  |     at /var/lib/ghost/versions/5.24.2/node_modules/knex-migrator/lib/database.js:57:19

ghost-app_1  |     at TCPConnectWrap.afterConnect [as oncomplete] (node:net:1278:16)

ghost-app_1  | 

ghost-app_1  | [2022-12-01 14:06:32] WARN Ghost is shutting down

ghost-app_1  | [2022-12-01 14:06:32] WARN Ghost has shut down

ghost-app_1  | [2022-12-01 14:06:32] WARN Your site is now offline

ghost-app_1  | [2022-12-01 14:06:32] WARN Ghost was running for a few seconds

gh_ghost-app_1 exited with code 2