text 如何找出因日志消息AH01067导致的503服务不可用：无法读取FastCGI标头

Posted 2021-05-01

Normally 503 service unavailable errors come from the server run out of memory.

Case: It occurs only on a some pages
==> Try to find the code which take the most memory (pdf, importing, ...)

Case: Whole site down
==> Check memory now by some tools such as: top, htop...
    Restart php-fpm