Add new image flavor with Alpine + PHP-FPM + Nginx

[ngosang]

First of all, thank you for providing Docker images.
Currently I'm using the "apache" flavor because I don't have an external web server. My only complain is the image is heavy.
I think it will be easy to extend the "fpm-alpine" image to include a Nginx server. The total size will be similar to "fpm-alpine", about 1 / 3 of the size of "apache" image.

[williamdes]

Hi,
I would also love to have a nginx alpine variant

@J0WI @tianon would that be accepted on the official repository?

[tianon]

There's not a way to create such a thing without adding some kind of process supervisor, right? That brings a lot of other problems with it, unfortunately. 😞

[tianon]

See also docker-library/php#54 (and linked issues) for more discussion around this.

[williamdes]

There's not a way to create such a thing without adding some kind of process supervisor, right? That brings a lot of other problems with it, unfortunately.

I am not sure you need any supervisor, here is my working example: https://github.com/sudo-bot/gh-deployer-container/blob/main/docker/Dockerfile

For me, as I do in my Docker images: the fpm service runs in background and then nginx service runs in foreground as the last command run

[williamdes]

See also docker-library/php#54 (and linked issues) for more discussion around this.

Thanks :)
Will read this soon

[tianon]

In that example, /bin/sh is the (very poor 😬) supervisor.

[ngosang]

Yes, you need a supervisor and I recommend s6. It's really lightweight, can spawn several processes (2 in this case), can restart failing tasks (it's configurable), can redirect stdout/stderr of all processes to the docker log, etc...
Kanboard uses same technologies Php-fpm+Nginx (s6 supervisor and Mysql backend) and the image is just 20MB compressed:
https://github.com/kanboard/kanboard/blob/master/Dockerfile
s6 supervisor is really easy to configure. Just create one folder + sh script for each process (we don't need cron here):
https://github.com/kanboard/kanboard/tree/master/docker/etc/services.d

Update: I can open a PR if you are willing to consider making it official.

[williamdes]

In that example, /bin/sh is the (very poor 😬) supervisor.

Oh, I did not think it like that but now that you say that it's obvious

s6 looks very cool and does not depend on an orgy of python things

I just read the thread and am not sure about the conclusion
If it is: no second process in an official container, then we can provide a nginx alpine only container to plug with the fpm alpine container

[J0WI]

then we can provide a nginx alpine only container to plug with the fpm alpine container

There is already a nginx:alpine image available.

[williamdes]

then we can provide a nginx alpine only container to plug with the fpm alpine container

There is already a nginx:alpine image available.

That's true, best we can do is support back decompressing phpmyadmin into the www folder to make fpm/nginx setups work

[yosifkit]

Official-images should not be using a process supervisor. It should be "one process" per container; this keeps things consistent, composable, and (hopefully) scalable.

Similar, now closed issue of adding a Apache2 + php-fpm image: docker-library/php#785. Related: https://github.com/docker-library/official-images/tree/ff0ef95394f0dfe67ac66d5293c0f6b2afdce6f5#init.

[williamdes]

Thank you for all your comments, it will be easier to reply to newer questions now

We should document and example with fpm and nginx like roundcube mail does: https://github.com/roundcube/roundcubemail-docker/blob/master/examples/docker-compose-fpm-alpine.yaml

[ngosang]

I just built a tiny Docker image for phpPgAdmin. It should work for phpMyAdmin just changing the download URL in the Dockerfile and adding missing php extensions. Feel free to copy the code or whatever you want.

phppgadmin/phppgadmin#144

Official-images should not be using a process supervisor. It should be "one process" per container; this keeps things consistent, composable, and (hopefully) scalable.

That is true, but, since this is an administrative tool and hence, it is not critical in a production environment we can make an exception in favor of convenience. I guarantee you that all the software packaged in that image is solid rock. It also manages stdout/stderr of all processes, clean restarts, clean shutdowns... all of it in 12 MB of disk and 10 MB of RAM, no external dependencies. phpmyadmin:5.1.1-apache is 178 MB of disk, 60 MB of RAM and the performance is worse.

[qeepcologne]

sounds fine. Current image is fat and has many unnecessary packages, don't know why intermediate php image is not using slim variant. I also prefer fully working alpine version, web-server don't matter (nginx, apache2 or lighttpd).