If ngnix fails, such as 502, how can we automatically start a STARTUP script such as nginx?

If ngnix fails, for example, 502, You can automatically start a STARTUP script such as nginx. How can you achieve this if ngnix fails, for example, 502, You can automatically start a STARTUP script such as nginx? How can php be implemented?

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If ngnix fails, such as 502, how can we automatically start a STARTUP script such as nginx in php?

Nginx 502 happens because Nginx is not suspended and the backend application is suspended.

One of the reasons for the rapid development of Nginx is that it is not so easy to mount. If the backend application fails, it will also send an error message to the front-end client, rather than simply failing to connect.

In addition, the 502 error may be caused by the failure of the php-fpm or incorrect configuration. Not nginx