Php – How to check current pm.max_children setting

PHPphp-fpmphp7

I have modified pm.max_children in /opt/plesk/php/7.0/etc/php-fpm.d/domain.com.conf file.

I restarted the php70-fpm service and want to check whether my settings are enabled or not.

How can I check this setting?

Best Answer

If you just want to know how many workers are currently running, you can try with HTOP, do a htop and filter (F4) with "php-fpm".

Or with ps

ps aux | grep "php-fpm: pool"

If you want precise and technical informations, you can use the fpm status page:

Add this to you pool configuration:

pm.status_path = /status

Then this in your nginx configuration: (adapt to your configuration)

location ~ ^/(status|ping)$ {
     access_log off;
     allow 127.0.0.1;
     allow 10.10.10.10#your-ip;
     deny all;
     include fastcgi_params;
     fastcgi_pass 127.0.0.1:9000;
}

You can then use CURL to query with:

 curl http://localhost/status

Which gives you something like:

pool:                 www
process manager:      dynamic
start time:           01/Mar/2019:15:16:10 +0100
start since:          2551
accepted conn:        7843
listen queue:         0
max listen queue:     0
listen queue len:     0
idle processes:       8
active processes:     2
total processes:      10
max active processes: 10
max children reached: 0

More informations / Source: https://easyengine.io/tutorials/php/fpm-status-page

Related Solutions

PHP-FPM – Server Reached pm.max_children: Solutions

There are many possible reasons why your PHP-FPM would reach the max_children. Most common ones are:

A lot of parallel requests from your clients
Slow execution of the PHP scripts
Very low setting of the max_children

Looking at the specs of your machine, assuming there is nothing else than PHP+Nginx running, I think you could set it much higher than 5. You say you have 8 Cores, usually Nginx needs much less CPU than PHP, so with 5 children you will probably never be able to use all of them. I'm usually setting it to something like the number of cores x 2 or number of cores x 4, depending on the memory consumption of your PHP scripts.

Php – Apache + PHP-FPM + chroot results “File not found.” error

PHP is running inside the chroot jail. So once you set this:

chroot = /opt/jail/example/home/example

Then the path /opt/jail/example/home/example becomes the path / for PHP. Because of that this is non-sensical:

php_admin_value[open_basedir]=/opt/jail/example/home/example

as PHP no longer has access to /opt/jail/example.... because it's outside of the root path.

You haven't posted it but you also need to make a change to the fastcgi_param config file, where you set the SCRIPT_FILENAME parameter which probably looks like this:

fastcgi_param  SCRIPT_FILENAME    $document_root$fastcgi_script_name;

which needs to be changed to something like:

fastcgi_param  SCRIPT_FILENAME    webroot/$fastcgi_script_name;

where if you combine the values of chroot + webroot + $fastcgi_script_name you get the absolute path of the file on the disk. Because PHP is running in the chroot you don't need to include it in the path.

btw It's a better practice to have the chroot to be set to one level above the webroot, so that your application can write to log files that are within the chroot, but not in the webroot, so that there's no way for them to be accidentally downloaded by a user.

So your directories would be:

/opt/jail/example/home/          <-- chroot
/opt/jail/example/home/example   <-- Read only directory is exposed as webroot (or document root).
/opt/jail/example/home/var/log   <-- Writeable directory that holds log files.

Best Answer

Related Solutions

PHP-FPM – Server Reached pm.max_children: Solutions

Php – Apache + PHP-FPM + chroot results “File not found.” error

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