in the spirit of fooling around and finding out.

Here, we'll build a container image that will run PHP via Apache and PHP-FPM running inside the same container.

Because we're running 2x processes in the container (apache2 and php-fpm), we need something to run as PID 1 (first process) which will manage those processes and respond to POSIX SIGNALs (see: https://dsa.cs.tsinghua.edu.cn/oj/static/unix_signal.html). The simplest way to do this is have supervisor run as PID 1 and let it manage the starting, stopping and restarting of the apache and php-fpm processes.

See: http://supervisord.org for more info.

For this use case, we won't restart either php-fpm or apache upon failure. Instead, we will rely on a container orchestrator to restart the container based on a health-check call to /xx-fpm.ping which will fail if either apache or php-fpm fail.

View the Dockerfile / config files for more details. We'll be using an official PHP container image (php:php8.2-fpm-bullseye at the time of writing) as our base image.

Example using the version at time of writing:

docker build -t customphp:php8.2-apache-fpm-bullseye .

docker run --rm --name php -p 8080:80 customphp:php8.2-apache-fpm-bullseye

You can override any of the environment variables in the Dockerfile. e.g. to enable the php-fpm slow log and set it to 1 second:

docker run --rm --name php -e PHP_fpm_request_slowlog_timeout=1 -p 8080:80 customphp:php8.2-apache-fpm-bullseye

• Open http://localhost:8080/xx-info.php (php info)
• Open http://localhost:8080/xx-fpm.ping (health-check)
• Open http://localhost:8080/xx-fpm.status?full (fpm status)
• Open http://localhost:8080/ (PHP Hello World)