Website 502, nginx error log, it seems that php-fpm made a mistake.

everything was fine yesterday, today I installed redis, and then installed the phpredis extension (this step is not yet complete), and then 502.
I"ve tried to restart php-fpm, but it still doesn"t work.

Mar.18,2021
The permissions of

php-fpm are not matched, or the php-fpm did not start successfully. It is recommended that you take a look at the php-fpm log and see if php-fpm is started.

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