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To: Jakub Zelenka <bukka@php.net>
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Thread-Topic: FPM preloading of PHP files
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Date: Fri, 20 Apr 2018 13:01:06 +0000
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Subject: Re: FPM preloading of PHP files
From: dmitry@zend.com (Dmitry Stogov)

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This makes sense.


________________________________
From: jakub.php@gmail.com <jakub.php@gmail.com> on behalf of Jakub Zelenka =
<bukka@php.net>
Sent: Friday, April 20, 2018 1:04:01 PM
To: Dmitry Stogov
Cc: PHP internals list
Subject: Re: FPM preloading of PHP files

Hi Dmitry,

On Fri, Apr 20, 2018 at 8:54 AM, Dmitry Stogov <dmitry@zend.com<mailto:dmit=
ry@zend.com>> wrote:

Hi Jakub,


I thought about pre-loading explicitly specified files (or directories) on =
PHP startup, before forking worker processes.

As result all pre-loadd files should be available to all workers. Of course=
 the should be kept in immutable form.


This is actually the reason why I'm thinking about the pool manager process=
 in this context. The current FPM architecture would make this quite proble=
matic. Currently the process that would have to preload the file would be a=
 master process because it's the one that forks worker processes. The probl=
em is that many (probably most) configurations have master running as a roo=
t and a worker process uses setuid and setgid to set a different user and g=
roup after the fork. I think that would be a source of many bug reports if =
the resources created during preloading could not be accessed by the applic=
ation (worker executed files) because the permission issue. Also it wouldn'=
t be probably a good idea to give a root access to the preloading as it cou=
ld have some security implications. That's why I think it would be better t=
o do preloading in a pool manager process that I described before (basicall=
y a process with the pool configured user and group that would spawn worker=
s).

Cheers

Jakub

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