doc(devbox): add fqa in devbox doc (#5289)

docs/5.0/docs/user-guide/devbox/faq.md

@@ -71,4 +71,76 @@ Try to open Cursor's extension market. If the extension market cannot be loaded
 
 ## 6. The local localhost can open the project but the public network address cannot be opened
 
-The exposed address in the code must be changed from `localhost` to `0.0.0.0` due to network reasons.
+The exposed address in the code must be changed from `localhost` to `0.0.0.0` due to network reasons.
+
+## 7. The Program Runs Normally in Devbox, but Fails to Run After Deployment
+
+Before deploying, please ensure you can execute `entrypoint.sh` in the terminal (this is the recommended startup script
+post-deployment). If public services are required, also check that the public address is accessible.
+
+```bash
+./entrypoint.sh
+```
+
+If you encounter the following issue:
+
+```bash
+bash: ./entrypoint.sh: Permission denied
+```
+
+You can run the following command in the terminal to modify the script's permissions, and then attempt to execute the
+`entrypoint` script again, ensuring the outcome aligns with your expectations.
+
+```bash
+sudo chmod +x entrypoint.sh
+```
+
+Additionally, it is advisable to build and test the project code in Devbox before deployment. Once testing is
+successful, you can proceed with the deployment. This can effectively prevent errors and out-of-memory (OOM) issues
+during the startup phase after deployment.
+
+## 8. Application Startup Fails When Listening on Port 80
+
+When using Devbox, the default user for local editors (such as VSCode, Cursor, etc.) is devbox.
+Ports in the range of 1-1023 are restricted to the administrator user.
+If you need to use these ports normally, please run your program with administrator privileges. For example, in the Go
+Devbox, you can use the following command:
+
+```bash
+sudo go run main.go
+```
+
+Alternatively, you could change your application's port.
+
+## 9. How to Change the Default User to Root in Devbox
+
+If you want to connect to Devbox as the root user when opening a local editor, please follow these steps. First, ensure
+your Devbox can connect properly using the default configuration. Open the file `~/.ssh/sealos/devbox_config` on your
+local machine. If you are uncertain about the file's location, please refer to Question 2.
+
+Locate the configuration that you wish to modify to use the root user, for example:
+
+```config
+Host usw.sailos.io_ns-rqtny6y6_devbox1234
+  HostName usw.sailos.io
+  User devbox
+  Port 40911
+  IdentityFile ~/.ssh/sealos/usw.sailos.io_ns-rqtny6y6_devbox1234
+  IdentitiesOnly yes
+  StrictHostKeyChecking no
+```
+
+Change the `User` value to root, as follows:
+
+```config
+Host usw.sailos.io_ns-rqtny6y6_devbox1234
+  HostName usw.sailos.io
+  User root
+  Port 40911
+  IdentityFile ~/.ssh/sealos/usw.sailos.io_ns-rqtny6y6_devbox1234
+  IdentitiesOnly yes
+  StrictHostKeyChecking no
+```
+
+After saving the changes, exit the local editor connected to Devbox and then reopen the editor. You should now be
+connected to Devbox as the root user.

docs/5.0/i18n/zh-Hans/user-guide/devbox/faq.md

@@ -71,4 +71,70 @@ upstream connect error or disconnect/reset before headers. retried and the lates
 
 ## 6、本地 localhost 能打开项目但是公网地址打不开
 
-代码里暴露地址由于网络原因必须从 `localhost` 改为 `0.0.0.0`。
+代码里暴露地址由于网络原因必须从 `localhost` 改为 `0.0.0.0`。
+
+## 7、在 Devbox 中可以正常运行程序，但是在发版之后，程序无法正常运行
+
+在发版之前请确保能在终端中运行 `entrypoint.sh` (这是推荐的发版后的启动脚本)，如果需要公网服务，也请同时检查公网地址是否联通。
+
+```bash
+./entrypoint.sh
+```
+
+如果遇到下面的问题:
+
+```bash
+bash: ./entrypoint.sh: Permission denied
+```
+
+可以在终端中输入如下的命令，并再次运行 `entrypoint` 脚本，并确保结果与期望的相同。
+
+```bash
+sudo chmod +x entrypoint.sh
+```
+
+同时，建议先在 Devbox 中预先构建完项目代码后并测试，测试成功后再发版，这可以有效避免在发版后的启动时的错误和 oom 问题。
+
+## 8、应用程序监听的端口为 80 时，应用程序启动失败
+
+在使用 Devbox 时，本地编辑器(vscode、cursor 等)
+默认的用户为 Devbox，监听 1-1023 端口是管理员用户的特权。 如果需要正常使用，请使用管理员账户运行你的程序，例如在 go 的
+Devbox 中，可以使用下面的命令:
+
+```bash
+sudo go run main.go
+```
+
+或者变更你的端口。
+
+## 9、如何在 Devbox 中更换默认的用户为 root 用户
+
+如果你需要在打开本地编辑器时，链接到 Devbox 的用户为 root，可以参考以下的步骤。
+首先请确保你的 Devbox 在使用默认的配置时，可以正常连接。
+打开本地电脑的 `~/.ssh/sealos/devbox_config`，如果不清楚这个文件在哪里，请参考问题2。
+
+找到你需要切换为 root 用户的配置，例如:
+
+```config
+Host usw.sailos.io_ns-rqtny6y6_devbox1234
+  HostName usw.sailos.io
+  User devbox
+  Port 40911
+  IdentityFile ~/.ssh/sealos/usw.sailos.io_ns-rqtny6y6_devbox1234
+  IdentitiesOnly yes
+  StrictHostKeyChecking no
+```
+
+修改 `User` 的值为 root，例如:
+
+```config
+Host usw.sailos.io_ns-rqtny6y6_devbox1234
+  HostName usw.sailos.io
+  User root
+  Port 40911
+  IdentityFile ~/.ssh/sealos/usw.sailos.io_ns-rqtny6y6_devbox1234
+  IdentitiesOnly yes
+  StrictHostKeyChecking no
+```
+
+保存之后退出打开了 Devbox 的本地编辑器，重新打开编辑器，连接到 Devbox，此时的用户已经切换为 root。