s2i as standalone from github repo and branch

This post shares some simple commands for using openshift s2i with podman as a standalone django-app builder from github. I was searching for some blogs, but did not find the accurate and updated answer for that.

While I took this course Introduction to Red Hat OpenShift Applications (DO101), I realized how to make it work with additional podman knowledge, and finally managed to make it work. I will describe here the “what do to” inorder to get it work in a desktop machine with django s2i example.

I will let openshift s2i doc and s2i doc, to explain s2i builder.

That link give an idea of how it should work, django-ex sample project running with python 3.5 and openshift quickstart. I would like to run django-app with python 3.10, podman search command called to help for finding python image answering this requirement. Below command searches for 3 images in quay.io repository.

podman search  --limit 3 quay.io/python-3

NAME                                                                                    DESCRIPTION
quay.io/fedora/python-311
quay.io/fedora/python-310
quay.io/redhat-user-workloads/open-data-hub-tenant/opendatahub/nb-base-ubi9-python-3-9  AppStudio repository for the use

Run your prepared django project

From s2i and other documents this s2i command has failed.

s2i build https://github.com/Yarboa/beyond-tutorial quay.io/fedora/python-310 django-tutorial
FATAL: permission denied while trying to connect to the Docker daemon socket at unix:///var/run/docker.sock: Get "http://%2Fvar%2Frun%2Fdocker.sock/v1.43/version": dial unix /var/run/docker.sock: connect: permission denied

It seems that s2i which written in go, is using Docker API, but I have podman, instead. As you may know or may not know podman is a wrapper of runc to fork and exec containers. Docker has a client server model, it needs docker daemon. I will let this old more secure way for containers to explain the difference. The following question appears, “Is a way to run/immitate docker daemon with podman on desktop host?

A bit more google searches brought this article podman rest api and podman man to help.

man podman-system-service

Prepare podman socket to work

Based on the previous section podman rest API could help here, lets try it. There is a need for socket activation to interact with podman libpod, it can also run as rootless daemon which is also cool and maybe replace docker.

systemctl enable --user podman.socket
systemctl start --user podman.socket
systemctl status --user podman.socket
● podman.socket - Podman API Socket
     Loaded: loaded (/usr/lib/systemd/user/podman.socket; enabled; preset: disabled)
     Active: active (listening) since Sun 2024-04-07 20:29:05 IDT; 1s ago
   Triggers: ● podman.service
       Docs: man:podman-system-service(1)
     Listen: /run/user/1000/podman/podman.sock (Stream)
     CGroup: /user.slice/user-1000.slice/user@1000.service/app.slice/podman.socket

Apr 07 20:29:05 my-fedora systemd[2368]: Listening on podman.socket - Podman API Socket.

We could see that socket is active Listen: /run/user/1000/podman/podman.sock

Building an image with s2i again

Base on podman man podman-system-service It seems that DOCKER_HOST=unix://$XDG_RUNTIME_DIR/podman/podman.sock, lets try to use it.

Now time to check it is up and running

s2i build --ref=main --loglevel=5 -U unix://${XDG_RUNTIME_DIR}/podman/podman.sock https://github.com/Yarboa/beyond-tutorial quay.io/fedora/python-310 django-tutorial
I0407 19:23:36.270826   42805 build.go:52] Running S2I version "v1.3.8"
...
I0408 11:13:49.289318   96717 build.go:182] Build completed successfully

Running image

podman images --format "" | grep django-tutorial
[docker.io/library/django-tutorial:latest]

podman run --replace --name django-app -d -p 9090:9090 -it docker.io/library/django-tutorial bash -c "pip install django; python manage.py migrate; setsid python manage.py runserver 0.0.0.0:9090 > runserver.log"
46310345352dbc905b1d1fa658317809f24aa5c3b031668bc1638ab089556001

Verify by opening web browser http://localhost:9090/ You will see the login page.

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