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Can php-fpm service interpret environment variables inside www.conf to create unique log files?

Hi all,

I'm currently working on a PHP project and using php-fpm as my PHP FastCGI manager. I've been trying to configure the logging for my PHP applications, and I was wondering if it's possible for the php-fpm service to interpret environment variables inside the www.conf file to create unique log files?

I have different environments for my application, such as development, staging, and production. Ideally, I would like to have separate log files for each environment to easily track and troubleshoot any issues that may arise. Instead of manually configuring the log file paths for each environment, it would be much cleaner and easier if I could use environment variables for this purpose.

So, my question is, can php-fpm understand and interpret environment variables set inside the www.conf file? If it does, then I could potentially use environment variables like `$ENVIRONMENT` in the `access.log` and `php-fpm.log` directive to dynamically generate unique log file paths based on the environment where php-fpm is running.

I would appreciate any insights or suggestions from those who have experience with php-fpm and configuring log files in a multi-environment setup. Thank you in advance for your help!

All Replies


Hey there,

I've had a similar need for unique log files in a multi-environment setup with php-fpm, so I believe I can provide some insights based on my personal experience.

To answer your question, php-fpm doesn't directly interpret environment variables inside the www.conf file. However, there is a way to achieve what you're looking for by leveraging the power of PHP itself.

One approach is to define your environment variables in a separate config file, such as `env.php`, which contains key-value pairs for each environment. For example:

return [
'development' => [
'logPath' => '/var/log/php/dev.log',
'staging' => [
'logPath' => '/var/log/php/staging.log',
'production' => [
'logPath' => '/var/log/php/prod.log',

Then, in your www.conf file, you can include this `env.php` file and access the environment-specific log path using the `$_SERVER` superglobal within the `access.log` and `php-fpm.log` directives. Here's an example:

access.log = /var/log/php/<?= require('/path/to/env.php')[$_SERVER['ENVIRONMENT']]['logPath']; ?>
php-fpm.log = /var/log/php/<?= require('/path/to/env.php')[$_SERVER['ENVIRONMENT']]['logPath']; ?>-fpm.log

In this example, assuming you have the `ENVIRONMENT` environment variable set to 'development', php-fpm will include the appropriate `logPath` value from the `env.php` based on the current environment during runtime.

Remember to reload or restart php-fpm service to apply the changes.

I hope this workaround helps you achieve the desired result. Give it a try and let me know if you have any further questions or need assistance with the implementation.

Best of luck!


Hey folks,

I stumbled upon this thread while searching for a solution to the same problem with php-fpm's logging and thought I'd share my experience.

In my case, I needed to have distinct log files for each environment in a multi-environment setup. After some digging, I found a workaround that doesn't involve modifying the `www.conf` file.

Instead of relying solely on php-fpm's built-in capabilities, I used a combination of shell scripting and PHP to achieve my goal. Here's what worked for me:

First, I created a shell script that sets the environment variable and starts php-fpm. For example:

export ENVIRONMENT="development"

Next, I modified my PHP application's entry point file (like `index.php`) to dynamically generate the log file paths based on the environment variable. Here's a simplified version of the code:

$environment = getenv('ENVIRONMENT');

$logPath = '/var/log/php/';

if ($environment === 'development') {
$logPath .= 'dev.log';
} elseif ($environment === 'staging') {
$logPath .= 'staging.log';
} elseif ($environment === 'production') {
$logPath .= 'prod.log';

ini_set('error_log', $logPath);

// Rest of the application code...

By setting the `error_log` configuration with the appropriate log file path based on the environment variable, the logging for each environment becomes isolated.

Remember to make the shell script executable (`chmod +x script.sh`) and start php-fpm using the script, rather than the direct `php-fpm` command.

I know this approach involves a bit more setup, but it worked well for me to have unique log files without directly modifying the `www.conf` file. Give it a try and let me know if you encounter any issues or need further assistance.

Hope this helps!


Hey everyone,

I came across this discussion while facing a similar challenge with php-fpm's logging in a multi-environment setup, and I have an alternative solution to share based on my personal experience.

Instead of modifying the `www.conf` file or using shell scripting, I found using conditional logging directives within the virtual host configurations to be an effective approach.

First, make sure you have separate virtual host configurations for each environment (e.g., development.conf, staging.conf, production.conf). Within each configuration, you can define the log file paths using conditional statements. Here's an example for Apache:

<VirtualHost *:80>
ServerName example.com

# Development Environment
<If "%{ENVIRONMENT} == 'development'">
ErrorLog /var/log/php/dev_error.log
CustomLog /var/log/php/dev_access.log combined

# Staging Environment
<If "%{ENVIRONMENT} == 'staging'">
ErrorLog /var/log/php/staging_error.log
CustomLog /var/log/php/staging_access.log combined

# Production Environment
<If "%{ENVIRONMENT} == 'production'">
ErrorLog /var/log/php/prod_error.log
CustomLog /var/log/php/prod_access.log combined

# Rest of the virtual host configuration...

By utilizing the `%{ENVIRONMENT}` variable, which you can set differently for each environment in your Apache or Nginx configurations, you can conditionally define the log file paths within the respective environment's virtual host.

This approach allows you to have distinct log files based on the environment without the need for manual intervention or extra scripting.

I hope this alternative solution proves useful to those facing a similar challenge. Let me know if you have any questions or require further assistance.

Best regards!

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