The probability that the website returns 502 from 3: 20 a.m. to 3: 40 a.m. every day is more than 2 / 1000. The server load is not high, on the contrary, all indicators have decreased?

Load-balancing redis mysql nginx php
Mar.29,2021

fpm configures max_requests if the number of requests processed by each fpm exceeds this number, it will restart. It should be that your business makes the number of fpm requests operate the threshold at that time, causing the fpm process to restart at the same time, and there are only a small number of fmp that can handle requests, resulting in 502. Please refer to http://www.yunweipai.com/arch.

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MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1e45bd8-590e1.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1e45bd8-590e1.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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