Understanding the Duplicate Log Issue

Oct 13, 2025 by wbrum.org 146 views

Optimizing PHP-FPM Logs in a Dockerized Environment

When working with Dockerized environments, managing logs can be a crucial aspect of ensuring smooth operation and efficient resource utilization. In this article, we will explore the possibility of disabling the PHP-FPM access log in stdout, specifically in the context of the php-nginx image.

Understanding the Duplicate Log Issue

The provided log output showcases duplicate lines for each request, which can be attributed to the PHP-FPM access log. This log is generated by the PHP-FPM (FastCGI Process Manager) service, which is responsible for managing PHP processes in a FastCGI environment.

# Log Output
2025-03-09T09:33:34.014275652Z 10.42.6.148 - - [09/Mar/2025:09:33:34 +0000] "HEAD / HTTP/1.1" 200 0 "https://example.com/" "Mozilla/5.0+(compatible; UptimeRobot/2.0; http://www.uptimerobot.com/)"
[php-fpm:access] 127.0.0.1 -  09/Mar/2025:09:33:31 +0000 "HEAD /index.php" 200 /var/www/html/web/index.php 2937.938 28672 27.91%

Why Disable the PHP-FPM Access Log?

Disabling the PHP-FPM access log in stdout can be beneficial in several scenarios:

Reduced Log Volume: By disabling the PHP-FPM access log, you can significantly reduce the volume of logs generated, making it easier to manage and analyze logs.
Improved Performance: Disabling the log can also improve performance, as it reduces the overhead associated with logging.
Simplified Log Analysis: With fewer logs to analyze, you can focus on the most critical information, making it easier to identify and troubleshoot issues.

Disabling the PHP-FPM Access Log in Stdout

To disable the PHP-FPM access log in stdout, you can modify the PHP-FPM configuration file (php-fpm.conf) to exclude the access log. Here's an example of how to do it:

# Disable PHP-FPM Access Log
sudo sed -i 's/;log_level = NOTICE/log_level = ERROR/' /etc/php/7.4/fpm/php-fpm.conf
sudo sed -i 's/;log_level = NOTICE/log_level = ERROR/' /etc/php/7.4/fpm/php-fpm.d/www.conf

However, this approach may not be suitable for all environments, as it modifies the PHP-FPM configuration file. A more elegant solution would be to use the php-fpm command-line option to disable the access log.

# Disable PHP-FPM Access Log using Command-Line Option
sudo php-fpm -F -f /etc/php/7.4/fpm/php-fpm.conf -c /etc/php/7.4/fpm/php-fpm.d/www.conf

Alternative Approach: Using a Docker Compose File

If you're using a Docker Compose file to manage your containers, you can modify the php-fpm service configuration to exclude the access log. Here's an example of how to do it:

version: '3'
services:
  php-fpm:
    image: php:7.4-fpm
    volumes:
      - ./php-fpm.conf:/etc/php/7.4/fpm/php-fpm.conf
      - ./www.conf:/etc/php/7.4/fpm/php-fpm.d/www.conf
    command: php-fpm -F -f /etc/php/7.4/fpm/php-fpm.conf -c /etc/php/7.4/fpm/php-fpm.d/www.conf

In this example, we're using the command option to specify the php-fpm command-line option to disable the access log.

Conclusion

Frequently Asked Questions and Answers

In this article, we will address some of the most common questions related to disabling the PHP-FPM access log in stdout.

Q: Why do I see duplicate lines in my log output?

A: The duplicate lines in your log output are likely due to the PHP-FPM access log. This log is generated by the PHP-FPM service and contains information about each request processed by PHP.

Q: How can I disable the PHP-FPM access log in stdout?

A: There are several ways to disable the PHP-FPM access log in stdout, including:

Modifying the PHP-FPM configuration file (php-fpm.conf) to exclude the access log.
Using the php-fpm command-line option to disable the access log.
Modifying the Docker Compose file to exclude the access log.

Q: What are the benefits of disabling the PHP-FPM access log?

A: Disabling the PHP-FPM access log can have several benefits, including:

Reduced log volume: By disabling the access log, you can significantly reduce the volume of logs generated.
Improved performance: Disabling the log can also improve performance, as it reduces the overhead associated with logging.
Simplified log analysis: With fewer logs to analyze, you can focus on the most critical information, making it easier to identify and troubleshoot issues.

Q: How do I modify the PHP-FPM configuration file to exclude the access log?

A: To modify the PHP-FPM configuration file to exclude the access log, you can use the following command:

sudo sed -i 's/;log_level = NOTICE/log_level = ERROR/' /etc/php/7.4/fpm/php-fpm.conf
sudo sed -i 's/;log_level = NOTICE/log_level = ERROR/' /etc/php/7.4/fpm/php-fpm.d/www.conf

Q: How do I use the `php-fpm` command-line option to disable the access log?

A: To use the php-fpm command-line option to disable the access log, you can use the following command:

sudo php-fpm -F -f /etc/php/7.4/fpm/php-fpm.conf -c /etc/php/7.4/fpm/php-fpm.d/www.conf

Q: How do I modify the Docker Compose file to exclude the access log?

A: To modify the Docker Compose file to exclude the access log, you can add the following configuration to your docker-compose.yml file:

version: '3'
services:
  php-fpm:
    image: php:7.4-fpm
    volumes:
      - ./php-fpm.conf:/etc/php/7.4/fpm/php-fpm.conf
      - ./www.conf:/etc/php/7.4/fpm/php-fpm.d/www.conf
    command: php-fpm -F -f /etc/php/7.4/fpm/php-fpm.conf -c /etc/php/7.4/fpm/php-fpm.d/www.conf

Q: What are some common issues I may encounter when disabling the PHP-FPM access log?

A: Some common issues you may encounter when disabling the PHP-FPM access log include:

Log volume reduction: Disabling the access log can significantly reduce the volume of logs generated, which may make it more difficult to troubleshoot issues.
Performance improvement: Disabling the log can also improve performance, but this may not be noticeable in all environments.
Simplified log analysis: With fewer logs to analyze, you can focus on the most critical information, making it easier to identify and troubleshoot issues.

Q: How do I troubleshoot issues related to disabling the PHP-FPM access log?

A: To troubleshoot issues related to disabling the PHP-FPM access log, you can:

Check the PHP-FPM configuration file for errors.
Verify that the php-fpm command-line option is being used correctly.
Review the Docker Compose file for errors.
Analyze the logs to identify any issues related to disabling the access log.

Q: Can I disable the PHP-FPM access log in a specific environment?

A: Yes, you can disable the PHP-FPM access log in a specific environment by modifying the PHP-FPM configuration file or using the php-fpm command-line option. However, this may require additional configuration to ensure that the access log is not disabled in other environments.