How to restart php-fpm automatically?

Aar

Aar

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Recently I got a new VPS server with 4GB RAM. The server has been running with one of my important sites for a few days now, but suddenly it was unreachable. Soon I noticed that php-fpm had overflowed with 2 GB of processes in memory.

Normally it runs around 110 MB of processes. Does anyone have an idea what could have been going on? I did notice that there is a massive attack on my contact form (which is secured), so I suspect a large amount of requests has knocked my php-fpm down or maybe a memory-leak of another glitch?

Does anyone have a good solution to automatically throw this php-fpm back up when it's down and let me know? or maybe better to set this so that it does not happen or less often?
 
Last edited:
maybe you on php 8.1.5?

PHP: PHP 8 ChangeLog

www.php.net www.php.net
FPM:
  • Fixed bug #77023 (FPM cannot shutdown processes).
that solved problem for me, also to prevent memory leaks - tune:
pm.max_children =
pm.process_idle_timeout =
pm.max_requests =
 
I have on this moment PHP 7.3, when my website is ready i will upgrade to 8.1.x
This is my configuration:
listen = /usr/local/php73/sockets/$pool.sock
listen.owner = $pool
listen.group = apache
listen.mode = 660

pm = ondemand
pm.max_children = 10
pm.process_idle_timeout = 60
pm.max_requests = 1000
Click to expand...
Where can i find the logs?
I see in the configuration this line:
error_log = log/php-fpm.log
Click to expand...
But where can i find the log?

I have more logs, from top. MySQL is using 101.6 % CPU?
How is MySQL hitting my php-fpm?
This is an automated message notifying you that the 5 minute load average on your system is 69.99.
This has exceeded the 10 threshold.

One Minute - 126.25
Five Minutes - 69.99
Fifteen Minutes - 35.8

top - 16:11:33 up 1 day, 22:40, 0 users, load average: 124.31, 70.52, 36.15
Tasks: 356 total, 22 running, 334 sleeping, 0 stopped, 0 zombie
%Cpu(s): 50.3 us, 46.9 sy, 0.0 ni, 0.0 id, 0.0 wa, 1.1 hi, 1.7 si, 0.0 st
MiB Mem : 3736.5 total, 143.9 free, 1316.8 used, 2275.8 buff/cache
MiB Swap: 1024.0 total, 989.0 free, 35.0 used. 2077.0 avail Mem

PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
837 mysql 20 0 1619140 264224 23736 S 101.6 6.9 97:16.30 /usr/sbin/mysqld
172056 root 20 0 62632 4836 3924 R 4.7 0.1 0:00.03 /usr/bin/top -c -b -n 1
172062 root 20 0 62632 4848 3932 R 4.7 0.1 0:00.03 /usr/bin/top -c -b -n 1
172064 root 20 0 62632 4816 3908 R 4.7 0.1 0:00.03 /usr/bin/top -c -b -n 1
110601 root 20 0 115532 34888 6552 R 3.1 0.9 1:14.17 lfd - scanning log files
168688 apache 20 0 2298800 51704 10324 S 3.1 1.4 1:14.09 /usr/sbin/httpd -DFOREGROUND
171627 arien 20 0 364152 22744 15924 S 3.1 0.6 0:00.02 php-fpm: pool arien
171745 apache 20 0 2166500 24196 10420 S 3.1 0.6 0:00.65 /usr/sbin/httpd -DFOREGROUND
172042 root 20 0 62632 4812 3904 R 3.1 0.1 0:00.03 /usr/bin/top -c -b -n 1
172058 root 20 0 62632 4784 3864 R 3.1 0.1 0:00.03 /usr/bin/top -c -b -n 1
172093 root 20 0 16608 2584 2328 R 3.1 0.1 0:00.04 /bin/netstat -autpn
172101 root 20 0 62632 4768 3852 R 3.1 0.1 0:00.03 /usr/bin/top -c -b -n 1
9 root 20 0 0 0 0 S 1.6 0.0 0:05.88 [ksoftirqd/0]
56 root 20 0 0 0 0 S 1.6 0.0 0:02.55 [kswapd0]
816 root 20 0 227524 17460 15436 S 1.6 0.5 0:54.94 /usr/libexec/sssd/sssd_nss --uid 0 --gid 0 --logger=files
171146 arien 20 0 417572 31364 24812 R 1.6 0.8 0:00.11 /usr/local/bin/php /home/arien/domains/**********/public_html/******/**********.php
171443 apache 20 0 2167352 25104 10144 S 1.6 0.7 0:01.13 /usr/sbin/httpd -DFOREGROUND
171583 arien 20 0 364152 22996 16168 S 1.6 0.6 0:00.02 php-fpm: pool arien
171653 arien 20 0 364152 22676 15856 S 1.6 0.6 0:00.01 php-fpm: pool arien
171695 arien 20 0 364152 22196 15380 S 1.6 0.6 0:00.01 php-fpm: pool arien
1 root 20 0 172536 10792 8120 S 0.0 0.3 0:29.50 /usr/lib/systemd/systemd --switched-root --system --deserialize 18
2 root 20 0 0 0 0 S 0.0 0.0 0:00.04 [kthreadd]
3 root 0 -20 0 0 0 I 0.0 0.0 0:00.00 [rcu_gp]
Click to expand...
 
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/usr/local/php73/var/log
or in /var/log/@php-fpm73.log (it is a symlink to /usr/local/php73/var/log)
 
maybe you have high memory limit, or additional modules loaded that can increase memory consumption.
if website don't need them - you can recompile php without them, or disable them to decrease footprint in ram.
 
This is the error:
WARNING: [pool arien] server reached max_children setting (100), consider raising it
Click to expand...
I just got a message from my hosting that they were having problems with their underlying VPS architecture, which has since been resolved. Since a value of max_children 100 should be fine, and is the default in DirectAdmin, I'm assuming the underlying issues will be the cause.

And the fact that MySQL had a high CPU would have something to do with that, I suspect.
What do you think of it?
 
Now I no longer experience any problems. ☺️
But do you have any idea where I can find the MariaDB log?

I found this list of log-file locations, but /var/lib/mysql/server.hostname.com.err, doesn't exists om Almalinux (Centos). (offcourse with right hostname)
 
Zhenyapan said:
pm.max_children =
Click to expand...
I'm just wondering if this setting can cause conflicts or odd things.
Because there are 2 similar values which can be used.

In directadmin.conf there is:
php_fpm_max_children_default=
and in php-fpm.conf it's the above setting.

I've got for example in directadmin.conf a value of 70 and in the php-fpm.conf the default value of 10 I don't really know what's the difference or which setting is overruling (if any).
 
@Zhenyapan Yep I'm aware of that page. But I don't quite understand the difference, which is why I asked.
Or does the directadmin.conf just mean that the limit there, can not be overruled by the ones in the php-fpm.conf files?

The doc is still not very clear, but it doesn't state if this is per php-fpm version or in total.
For example if you have 3 php-fpm versions with max 10 set in php-fpm.conf and directadmin.conf, you would have 30 max, which would be more then the limit in directadmin.conf.
 
Richard G said:
The doc is still not very clear, but it doesn't state if this is per php-fpm version or in total.
Click to expand...
it's default limit for each php version separately. For example if you provide cheap hosting and want to limit user cpu consumption - you can set default limit 2 children, so even if they will be 100% loaded - it will use only 2 cpu cores. It's the same limit which you can configure per user per each it's php version.
 
@jamgames2 I'm not talking about anything custom. I know you have to do the ./build rewrite_confs after changing the value in directadmin.conf but it doesn't say anything anyway about the /usr/lib/phpXX/etc/php-fpm.conf which has a similar option.

@Zhenyapan So it's like this then?
Directadmin.conf -> Max children for each php-fpm version seperately
/usr/lib/phpXX/etc/php-fpm.conf -> Max children for that specific php-fpm version. So you can set for example 10 for php 7.4 and 4 for php 8.0 but never more then 10 because in directadmin.conf the max limit is 10. So in php-fpm.conf you can't use 11 or more for example.
That correct?

@Aar Weet jij dat toevallig?
 
@Richard G
I meant, it rewrite to these file.
/usr/local/directadmin/data/users/{SOME_USER}/php/php-fpmXX.conf

no need to do with /usr/lib/phpXX/etc/php-fpm.conf

because only have one template to custom php-fpm, maybe that path you mention doesn't make change with php_fpm_max_children_default. I never check that path.
 
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jamgames2 said:
I meant, it rewrite to these file.
Click to expand...
Ah indeed, it does. That makes it even more confusing to me. What is the /usr/local/phpXX/etc/php-fpm.conf for then?

So it's the other way around? The /usr/local/phpXX/etc/php-fpm.conf is for the default php-fpm settings for that version and directadmin.conf overrules it for all users?
 
Richard G said:
Directadmin.conf -> Max children for each php-fpm version seperately
/usr/lib/phpXX/etc/php-fpm.conf -> Max children for that specific php-fpm version. So you can set for example 10 for php 7.4 and 4 for php 8.0 but never more then 10 because in directadmin.conf the max limit is 10. So in php-fpm.conf you can't use 11 or more for example.
That correct?
Click to expand...
no, it's start limit which just be put to all configs afrer rewrite_confs or PHP rebuild/update. I think it shouldn't prevent you to increase limit for user/global manually. but better to ask @smtalk
 
Oke thank you both very much.
I will start a seperate thread if I need it and doesn't do what I now think it should do. ;)
 
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