[Web] Enable slow log configuration in nginx php-fpm (to detect slow-executing PHP scripts)

Many webmasters are troubled by 500,502 issues after switching to nginx+php-fpm. When nginx receives the above error code, it can be determined that there is some kind of problem with the backend php-fpm parsing php, such as execution error or execution timeout.

php-fpm.conf has a parameter request_slowlog_timeout described like this

When request_slowlog_timeout is set to a specific second request_slowlog_timeout =5, it means that if a script is executed for more than 5 seconds, the script will be recorded in the slow log file

request_slowlog_timeout =0 means that slow log output is turned off.

The slow log file location is in the log folder in the php installation directory by default, and you can specify it by modifying the slowlog = log/$pool.log.slow parameter.

php-fpm slow log example, the slow log will record the process number, script name, specific file which line of code, which function is too long to execute.

request_slowlog_timeout and slowlog need to be set at the same time, and you need to turn on slowlog at the same time as turning on the request_slowlog_timeout

Slow log paths need to be created manually

Specific steps to enable php-fpm slow logging: