Multiprocess PHP Containers with S6 Overlay - ConFoo 2023

In the pre-container era, the most common way of running PHP applications was with Nginx + PHP-FPM, with containers this is harder as you need two processes: Nginx and PHP-FPM.

S6 Overlay can help to manage multi-process applications in a container - it takes the burden of security aspects, signal handling, configuration and log management off your shoulders & make your code more readable!

URL: https://confoo.ca/en/2023
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Info about S3 Overlay: https://github.com/just-containers/s6-overlay

Transcript

1. http://www.joomlatools.com/developer @joomlatools Multiprocess PHP Containers with S6 Overlay
2. Johan Janssens
 Web Developer, Hacker and OpenSwoole Contributor / Evangelist @johanjanssens johanjanssens johanjanssens
3. 1 In the pre-container era, the most common way of running PHP applications was with Nginx + PHP-FPM, with containers this is harder as you need two processes: PHP requires a web server process (nginx, apache, caddy, …) and a PHP-FPM process in order to run your application The Problem
4. 2 Official PHP Docker Images The official PHP Docker images are single process containers offered in 2 flavours: 
 
 1. PHP + PHPFPM (*) 
 2. PHP + Apache (running mod_php) 
 
 (*) In order to use this image variant, some kind of reverse proxy (such as NGINX, Apache, or other tool which speaks the FastCGI protocol) will be required. 
 
 More info: https://github.com/docker-library/php
5. http://www.joomlatools.com/developer @joomlatools S6 Overlay A process supervisor for Docker containers
6. 3 S6 Overlay can help to manage multi-process applications in a container - it takes the burden of security aspects, signal handling, configuration and log management off your shoulders & make your code more readable! 
 
 Its based on s6 is a small suite of programs for UNIX, designed to allow process supervision (a.k.a service supervision), in the line of daemontools and runit, as well as various operations on processes and daemons 
 
 More info: • https://skarnet.org/software/s6/ • https://github.com/just-containers/s6-overlay S6 Overlay
7. http://www.joomlatools.com/developer @joomlatools Wait... isn't Docker supposed to be a "single process per container"?
8. 4 S6 Overlay Philosophy There's nothing inherently bad about running multiple processes in a container. The more abstract "one thing per container" is our policy - a container should do one thing, such as "run a chat service" or "run gitlab." This may involve multiple processes, which is fine. S6’s interpretation of "The Docker Way" is thus: • Containers should do one thing • Containers should stop when that thing stops If "the thing" fails, then the container should fail, too. We do this by determining which processes can restart, and which should bring down the container.
9. https://github.com/serversideup/docker-php
10. https://github.com/serversideup/docker-php https://hub.docker.com/r/serversideup/php/
11. A demo to get started…
12. serversideup/php:8.1-fpm-nginx
13. Hosting options …
14. https://www.digitalocean.com/products/app-platform
15. https://cloud.google.com/run
16. https://hub.docker.com/r/serversideup/php/ https://north fl ank.com/
17. https://railway.app/
18. https://render.com/
19. https://www.withcoherence.com/
20. https:// fl y.io/ (*) Only works with S6 Overlay 2.x, requires FROM serversideup/php:8.1-fpm-nginxv1.5.0
21. Let’s add some toys!
22. 5 Adding an OpenSwoole HTTP Service
23. 6 Adding an OpenSwoole HTTP Service oneshot longrun
24. 7 /var/www/services/swoole/index.php
25. 8 /var/www/services/fastcgi/index.php
26. Another demo to get going…
27. serversideup/php:8.1-fpm-nginx
28. Who da man ?! Happy coding! Please give kudos to @danpostori and @jaydrogers