Intermittent 503 timeouts on website due to PHP FPM "Attempt to connect to Unix domain socket failed"

Timothy Fisher

9/28/23, 5:09 PM

I have been experiencing intermittent site outages showing a 503 error. The site normally runs just fine. I've pinpointed it to the following error that gets spammed in my apache logs:

FCGI: attempt to connect to Unix domain socket /run/php/php7.3-fpm.sock (*) failed

When I run service php7.3-fpm restart, the site comes back up and everything runs fine.

When I run ps aux | grep php-fpm I get something like this:

root     20772  0.0  0.0 1152852 33600 ?       Ss   12:42   0:00 php-fpm: master process (/etc/php/7.3/fpm/php-fpm.conf)
www-data 20773 10.6  0.1 1285072 250308 ?      S    12:42   2:34 php-fpm: pool www
www-data 20774  9.8  0.1 1271452 244952 ?      S    12:42   2:22 php-fpm: pool www
www-data 20775  9.8  0.1 1260964 219920 ?      S    12:42   2:22 php-fpm: pool www
// ... etc

Also, here is my permissions list in /run/php:

-rw-r--r-- 1 root     root     5 May 28 12:42 php7.3-fpm.pid
srw-rw---- 1 www-data www-data 0 May 28 12:42 php7.3-fpm.sock

I noticed that the master process is running as root. Is it supposed to be running as root? Could this be the issue?

0 + 0

php-fpm

apache2

Elon Musk

I sit in a Tesla and translated this thread with Ai:

EN: Intermittent 503 timeouts on website due to PHP FPM "Attempt to connect to Unix domain socket failed"

TH: การหมดเวลาเป็นระยะ ๆ 503 บนเว็บไซต์เนื่องจาก PHP FPM "ความพยายามเชื่อมต่อกับซ็อกเก็ตโดเมน Unix ล้มเหลว"

RO: Timeout-uri intermitente 503 pe site din cauza PHP FPM „Încercarea de conectare la soclul domeniului Unix a eșuat”

RU: Периодические тайм-ауты 503 на веб-сайте из-за PHP FPM «Попытка подключения к сокету домена Unix не удалась»

VI: Thời gian chờ 503 không liên tục trên trang web do PHP FPM "Cố gắng kết nối với ổ cắm tên miền Unix không thành công"

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