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I am having issues with performance degradation / website is not reachable. End users see 502 Bad gateway error.

The behaviour is php-fpm works fine for several hours, then site starts to work slower and slower and then site throws 502 error. The only solution I use is to restart php -> /etc/init.d/php7.3-fpm restart.

I am also aware of these params emergency_restart_threshold 10 emergency_restart_interval 1m process_control_timeout 10s

Which I set earlier, but still it doesn't resole a real issue. Sometimes web server is unavailable for 5-10 minutes.

I suspect it's caused by php-fpm buffer overflow as when web server throws 502 - php fpm is still running. But is not able to handle new requests.

Please advice, any help is appreciated!

I use:

1. Ubuntu 18.04.2 LTS (GNU/Linux 4.15.0-1044-aws x86_64)
2. nginx/1.14.0 (Ubuntu)
3. php7.3-fpm

Logs and configs:

1. php7.3-fpm.log
https://listhub-reports.s3.amazonaws.com/logs/php7.3-fpm-new.log.txt
I had to restart php manually due to 502 error at 30-Aug-2019 10:08:38

2. Syslog
https://listhub-reports.s3.amazonaws.com/logs/syslog.txt

3. PHP.ini
https://listhub-reports.s3.amazonaws.com/logs/php.ini.txt

4. PHP-FPM.conf
https://listhub-reports.s3.amazonaws.com/logs/php-fpm.conf.txt

5. WWW.conf
https://listhub-reports.s3.amazonaws.com/logs/www.conf.txt

Please let me know if you need more details.

Thanks in advance!

Aleksandr Korsukov
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  • What is PHP-FPM buffer overflow? Use `dmesg` to see if you had any Out of Memory conditions and adjust PHP-FPM `max_children` to ensure that it won't cause those conditions or swapping. – Danila Vershinin Aug 30 '19 at 23:45
  • Thanks @DanilaVershinin! This is the dmesg log, could you please look at, does something stand out? https://listhub-reports.s3.amazonaws.com/logs/dmesg.txt – Aleksandr Korsukov Sep 06 '19 at 17:22

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