PHP -FPM 502 如何解决

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通过下面的日志，增加 pm.max_children 数字的确可以减少 502 的发生，但是，已经加到 300 了，还是会达到这个数字。网站流量也不大，怀疑是某个 PHP 运行出了点问题，大家知道怎么定位解决吗？

# php7.1-fpm.log
[19-Mar-2020 08:07:19] WARNING: [pool www] seems busy (you may need to increase pm.start_servers, or pm.min/max_spare_servers), spawning 8 children, there are 46 idle, and 137 total children
[19-Mar-2020 08:12:44] WARNING: [pool www] seems busy (you may need to increase pm.start_servers, or pm.min/max_spare_servers), spawning 8 children, there are 48 idle, and 164 total children
[19-Mar-2020 08:17:20] WARNING: [pool www] seems busy (you may need to increase pm.start_servers, or pm.min/max_spare_servers), spawning 8 children, there are 46 idle, and 243 total children
[19-Mar-2020 08:27:04] WARNING: [pool www] server reached pm.max_children setting (300), consider raising it

# php.ini 配置
pm = dynamic
pm.max_children = 300
pm.start_servers = 75
pm.min_spare_servers = 50
pm.max_spare_servers = 100
pm.max_requests = 1000

children

servers

mar-2020

WARNING

3 replies • 2020-03-19 09:41:43 +08:00

justfindu

Mar 19, 2020

你可能需要优化你的代码或许其中有一些堵塞

b821025551b

Mar 19, 2020

把 slow log 打开，可能是一直在阻塞导致不断地申请新 child 导致不足。

dilu

Mar 19, 2020 via Android

我们线上机器 32 核 64，php 最大子进程 800，你可以参考参考。
子进程并非越大越好，每个进城处理的连接数限制为 5000 试试记得开一下 fpm 的慢日志看看是不是代码有问题，也有可能是数据库或者别的组件甚至是网络问题。
给你个建议，出现诡异的情况先想想基础建设的问题，例如硬件，网络，磁盘，交换机等等。然后再考虑应用的问题。