docs: migrate 12-factor tutorials to Canonical Kubernetes by florentianayuwono · Pull Request #2882 · canonical/charmcraft

florentianayuwono · 2026-09-15T15:21:27Z

Follow-up to the how-to guide migration (#2743), addressing review feedback that the 12-factor tutorials still required MicroK8s. This migrates the tutorials to use Canonical Kubernetes (CK8s) exclusively — no MicroK8s alternative.

Changes

Shared tutorial setup (docs/reuse/tutorial/setup_stable.rst, setup_edge.rst)

Install and bootstrap Canonical Kubernetes (sudo snap install k8s --classic, sudo k8s bootstrap).
Enable local-storage (replaces MicroK8s' hostpath-storage) and ingress.
Enable the built-in load-balancer with an L2 address pool set to the VM's own IP. Unlike the MicroK8s ingress add-on, the CK8s ingress is fronted by a LoadBalancer service, so a load balancer is required for the ingress to be assigned a reachable address. The tutorial curl commands resolve the ingress host to that address ($INGRESS_IP) instead of the loopback address.
Register the cluster as a Juju cloud (sudo k8s config | juju add-k8s ...), since CK8s isn't autodetected like MicroK8s.
Set up a small local OCI registry on localhost:5000. CK8s has no bundled registry addon, so the tutorials run the static distribution registry as a systemd service and point containerd at it through /etc/containerd/hosts.d/localhost:5000/hosts.toml.

Six framework tutorials and their task.yaml tests (Django, Express, FastAPI, Flask, Go, Spring Boot)

Push the rock to the local registry with rockcraft.skopeo copy to localhost:5000, per reviewer request to use a registry rather than driving containerd directly in a tutorial.
Reference the charm resource image with the localhost:5000/ prefix.
Update prose and juju status sample output for CK8s.

How-to (docs/howto/manage-web-app-charms/integrate-web-app-charm.rst)

Make the load-balancer step Canonical K8s-only, consistent with migrating the 12-factor docs off MicroK8s.

Spread (spread.yaml)

The docs/tutorial/code/ suite deploys the same local registry and containerd hosts.d config so the executable tutorial tests exercise the documented registry workflow on CK8s.
Enable the load balancer and curl the ingress address directly, matching the documented commands (removing the earlier test-only loopback DNAT workaround).

Validation

Docs build passes with sphinx-build --fail-on-warning.
⚠️ The task.yaml files are executable spread integration tests. They require a full Multipass + CK8s setup and a self-hosted docs runner, so their end-to-end execution on CK8s — particularly ingress via nginx-ingress-integrator — should be validated in CI.

I've followed the contribution guidelines.
I've signed the CLA.
I've successfully run make lint && make test.
I've added or updated any relevant documentation.
In documents I changed, I added a meta description if one was missing.
I've updated the relevant release notes.

Replace MicroK8s with Canonical Kubernetes throughout the 12-factor app tutorials so they use CK8s exclusively, following up on the how-to guide migration. - Rework the shared tutorial setup (setup_stable.rst, setup_edge.rst) to install and bootstrap Canonical Kubernetes (k8s snap), enable local-storage and ingress, and register the cluster as a Juju cloud with 'juju add-k8s' before bootstrapping. - Replace the MicroK8s registry push (rockcraft.skopeo copy to localhost:32000) with a direct containerd image import ('ctr images import') and reference the image without the registry prefix in the six framework tutorials and their task.yaml tests. - Update prose and 'juju status' sample output accordingly. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Remove the MicroK8s options from the manage-web-app-charms how-to guides so they use Canonical Kubernetes exclusively, matching the tutorial migration. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Copilot

🟡 Changes recommended

The six executable task suites still provision MicroK8s, so their CK8s commands cannot run until the test environment is updated.

Get a fresh assessment by requesting another Copilot review.

Pull request overview

Migrates the 12-factor tutorials from MicroK8s to Canonical Kubernetes.

Changes:

Updates shared CK8s setup and Juju registration.
Replaces registry pushes with containerd image imports.
Refreshes tutorial instructions and sample output.

File summaries

File	Summary
`docs/tutorial/kubernetes-charm-spring-boot.rst`	Updates Spring Boot tutorial for CK8s.
`docs/tutorial/kubernetes-charm-go.rst`	Updates Go tutorial for CK8s.
`docs/tutorial/kubernetes-charm-flask.rst`	Updates Flask tutorial for CK8s.
`docs/tutorial/kubernetes-charm-fastapi.rst`	Updates FastAPI tutorial for CK8s.
`docs/tutorial/kubernetes-charm-express.rst`	Updates Express tutorial for CK8s.
`docs/tutorial/kubernetes-charm-django.rst`	Updates Django tutorial for CK8s.
`docs/tutorial/code/spring-boot/task.yaml`	Uses CK8s containerd image import; requires CK8s test-suite provisioning.
`docs/tutorial/code/go/task.yaml`	Uses CK8s containerd image import; requires CK8s test-suite provisioning.
`docs/tutorial/code/flask/task.yaml`	Uses CK8s containerd image import; requires CK8s test-suite provisioning.
`docs/tutorial/code/fastapi/task.yaml`	Uses CK8s containerd image import; requires CK8s test-suite provisioning.
`docs/tutorial/code/expressjs/task.yaml`	Uses CK8s containerd image import; requires CK8s test-suite provisioning.
`docs/tutorial/code/django/task.yaml`	Uses CK8s containerd image import; requires CK8s test-suite provisioning.
`docs/reuse/tutorial/setup_stable.rst`	Defines stable CK8s setup and Juju registration.
`docs/reuse/tutorial/setup_edge.rst`	Defines edge CK8s setup and Juju registration.

Review details

Files reviewed: 16/16 changed files
Comments generated: 6
Review effort level: Lite

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The tutorial task.yaml files now import images with the k8s snap's containerd (`ctr`) and deploy to a `k8s-cloud` Juju cloud, but the shared docsuite only provisioned MicroK8s. Give docs/tutorial/code/ a dedicated suite that installs the k8s snap, configures the docker.io containerd mirror, bootstraps Canonical Kubernetes, enables local-storage, ingress and the load balancer, and registers k8s-cloud with Juju. The how-to code suite stays on MicroK8s. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

florentianayuwono · 2026-09-15T16:52:59Z

Addressed in 49c61e3: the six tutorial task suites no longer inherit the MicroK8s docsuite. docs/tutorial/code/ now has a dedicated spread suite that provisions Canonical Kubernetes instead:

installs the k8s snap (1.34-classic/stable) so /snap/k8s/current/bin/ctr is available for the image imports;
writes the docker.io pull-through mirror to /etc/containerd/hosts.d/docker.io/hosts.toml (the k8s snap's containerd path) before bootstrap;
k8s bootstrap, then enables local-storage, ingress, and the load-balancer (with an L2 pool set to the node IP — required because CK8s exposes ingress via a LoadBalancer service, unlike the MicroK8s host-port addon);
registers the cluster as the k8s-cloud Juju cloud (k8s config | juju add-k8s k8s-cloud --client) and bootstraps dev-controller on it.

The how-to code suite (docs/howto/code/) intentionally stays on MicroK8s, as those task.yaml files still use MicroK8s.

Note: these suites are manual: true and I can't run them locally, so CI validation is needed — in particular the nginx-ingress-integrator + Cilium ingress path.

alithethird

Left some nitpicks, overall looking good.

Address PR review feedback: avoid driving containerd directly (`ctr images import`) in the 12-factor tutorials. Instead deploy a small local OCI registry at localhost:5000 and push rocks to it with `rockcraft.skopeo copy`, mirroring the previous MicroK8s registry flow. - setup_stable.rst / setup_edge.rst: add a "Set up a local registry" section (distribution registry binary as a systemd service + containerd hosts.d config for localhost:5000). - tutorial task.yaml (6 frameworks): push rocks via skopeo and reference images as localhost:5000/<app>:<ver>. - tutorial .rst (6 frameworks): update prose/bullets to the registry and skopeo workflow. - spread.yaml tutorial suite: deploy the registry + hosts.d config in place of the docker.io pull-through mirror block. - Trim heading underlines in the setup files (review nitpick). Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

…s-ck8s-isd-4330 # Conflicts: # docs/howto/manage-web-app-charms/use-web-app-charm.rst

Copilot

Copilot review overview

🟡 Changes recommended

Resolve the registry/containerd mismatch, CK8s ingress access setup, and removed MicroK8s guidance.

Review effort: Lite
Findings: 7 · 1

Open (8)

Import rocks into containerd instead of pushing to localhost · New
Import rocks into containerd instead of pushing to localhost · New
Import rocks into containerd instead of pushing to localhost · New
Import rocks into containerd instead of pushing to localhost · New
Import rocks into containerd instead of pushing to localhost · New
Import rocks into containerd instead of pushing to localhost · New
Align spread tests with direct containerd image imports · New
Restore MicroK8s and Canonical K8s tabs · New

Resolved since last review (6)

This executable tutorial task inherits the docsuite setup from spread.yaml:235-271, which…
This executable tutorial task inherits the docsuite setup from spread.yaml:235-271, which…
This executable tutorial task inherits the docsuite setup from spread.yaml:235-271, which…
This executable tutorial task inherits the docsuite setup from spread.yaml:235-271, which…
This executable tutorial task inherits the docsuite setup from spread.yaml:235-271, which…
This executable tutorial task inherits the docsuite setup from spread.yaml:235-271, which…

…s-ck8s-isd-4330

Copilot

🟡 Changes recommended

The stable and edge setup instructions omit the load-balancer provisioning and loopback DNAT commands required by the documented ingress checks.

2 open findings

8 resolved since last review

🧠 Review effort: Lite

The Canonical Kubernetes ingress is fronted by a LoadBalancer service rather than binding the node's host ports like the MicroK8s add-on, so the documented `curl ... 127.0.0.1` requests could not reach the app. Enable the built-in load balancer with an L2 address pool set to the VM's own IP in the tutorial setup, and resolve the ingress host to that address (`$INGRESS_IP`) instead of the loopback address. Align the spread tutorial suite with the documented commands and drop the test-only loopback DNAT workaround. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Copilot

🟡 Changes recommended

Address the critical command error and moderate registry exposure findings.

1 open finding

Remove trailing backtick from shell command · New

2 resolved since last review

🧠 Review effort: Lite

Co-authored-by: florentianayuwono <76247368+florentianayuwono@users.noreply.github.com> Signed-off-by: florentianayuwono <76247368+florentianayuwono@users.noreply.github.com>

Remove a stray trailing double-backtick from a `curl` command in the Spring Boot tutorial so the rendered code block can be copied verbatim. Add a release note for the 12-factor tutorial migration to Canonical Kubernetes. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

… tutorials Replace the static local-binary OCI registry and containerd hosts.d configuration with an in-cluster NodePort registry exposed on the node at localhost:32000, mirroring the MicroK8s registry addon. Wait for the load-balancer (MetalLB) webhook to become ready before configuring its address pool to avoid a validation-webhook race, and reuse a single INGRESS_IP variable defined during setup across the tutorial curls. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Waiting on `k8s status --wait-ready` does not guarantee that MetalLB's validating webhook is serving, so configuring the load-balancer address pool could still race the webhook and leave the feature in a Failed state. Wait for the metallb-controller deployment (which hosts the webhook) to roll out before setting the CIDRs, matching behaviour verified on a live Canonical Kubernetes cluster. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Canonical Kubernetes exposes ingress through Cilium, whose ``cilium`` IngressClass is not the cluster default. Unlike the MicroK8s ingress addon, Cilium does not claim classless Ingress resources, so the nginx-ingress-integrator's Ingress was never assigned an address and the integrator stalled on "Waiting for ingress IP availability". Set ``ingress-class=cilium`` on the integrator so its Ingress targets the Cilium controller. Validated end to end on a clean Canonical Kubernetes VM. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

The framework profiles generate charmcraft.yaml with ``base`` and ``platforms``, so ``charmcraft pack`` names the artifact ``<name>_<architecture>.charm``. The tutorials still showed the old ``bases``-style ``<name>_ubuntu-<series>-<architecture>.charm`` output (django even showed 22.04). Correct the example output to match. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Use the single ``self-hosted-linux-amd64-noble-large`` runner label for the docs-tests job instead of the multi-label set, which was mapping to a starved runner pool and preventing the docs spread tests from running. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Switch the snap-build and spread-select jobs to the combined ``self-hosted-linux-amd64-noble-medium`` and ``spread-installed`` runner labels, matching the docs-tests job. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

erinecon

Thanks for updating the tutorials! My initial issues have been resolved, but now I'm running into issues when integrating with a database. I also spotted a doc linting issue that we can resolve

I tested Express, FastAPI, and Flask

erinecon · 2026-10-20T16:53:15Z

 jobs:
  snap-build:
-    runs-on: [self-hosted, linux, amd64, noble, medium]
+    runs-on: self-hosted-linux-amd64-noble-medium


Linter is complaining about this change (and the other similar change later in this file):

.github/workflows/spread-docs.yaml:25:14: label "self-hosted-linux-amd64-noble-medium" is unknown. available labels are "windows-latest", "windows-latest-8-cores", "windows-2025", "windows-2022", "windows-11-arm", "ubuntu-slim", "ubuntu-latest", "ubuntu-latest-4-cores", "ubuntu-latest-8-cores", "ubuntu-latest-16-cores", "ubuntu-24.04", "ubuntu-24.04-arm", "ubuntu-22.04", "ubuntu-22.04-arm", "macos-latest", "macos-latest-xl", "macos-latest-xlarge", "macos-latest-large", "macos-26-xlarge", "macos-26", "macos-15-intel", "macos-15-xlarge", "macos-15-large", "macos-15", "macos-14-xl", "macos-14-xlarge", "macos-14-large", "macos-14", "macos-13-xl", "macos-13-xlarge", "macos-13-large", "macos-13", "self-hosted", "x64", "arm", "arm64", "linux", "macos", "windows", "linux", "spread-enabled", "spread-installed", "amd64", "arm64", "ppc64el", "riscv64", "s390x", "focal", "jammy", "noble", "resolute", "medium", "large", "xlarge", "2xlarge", "2xlarge-extra", "edge", "tiobe", "large-tiobe", "2xlarge-tiobe". if it is a custom label for self-hosted runner, set list of labels in actionlint.yaml config file [runner-label]

erinecon · 2026-10-20T18:35:53Z

 Check the total number of visitors:

 .. code-block:: bash

-    curl http://flask-hello-world/visitors --resolve flask-hello-world:80:127.0.0.1
+    curl http://flask-hello-world/visitors --resolve flask-hello-world:80:$INGRESS_IP

 This request should return ``1`` after the previous request to the root endpoint.


I did not get a response from the visitors endpoint:

(.venv) ubuntu@charm-dev:~/flask-hello-world/charm$ curl http://flask-hello-world --resolve flask-hello-world:80:$INGRESS_IP Hi! (.venv) ubuntu@charm-dev:~/flask-hello-world/charm$ curl http://flask-hello-world/visitors --resolve flask-hello-world:80:$INGRESS_IP (.venv) ubuntu@charm-dev:~/flask-hello-world/charm$ curl http://flask-hello-world/visitors --resolve flask-hello-world:80:$INGRESS_IP (.venv) ubuntu@charm-dev:~/flask-hello-world/charm$ curl http://flask-hello-world --resolve flask-hello-world:80:$INGRESS_IP Hi! (.venv) ubuntu@charm-dev:~/flask-hello-world/charm$ curl http://flask-hello-world/visitors --resolve flask-hello-world:80:$INGRESS_IP

I tried again today with Flask and Go -- in both attempts, I did not get a response from the visitors endpoint.

I also tried the Go tutorial with both PostgreSQL 14 and 16 -- same lack of response.

Signed-off-by: Alex Lowe <alex.lowe@canonical.com>

Co-authored-by: Erin Conley <erin.conley@canonical.com> Signed-off-by: florentianayuwono <76247368+florentianayuwono@users.noreply.github.com>

Increase the Multipass VM memory from 4 GB to 8 GB in the shared setup pages and the per-framework prerequisites to avoid pack errors and I/O timeouts during the build steps. Add "balancer('s)?" to the custom wordlist so the load-balancer prose passes the documentation linter. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Django 6.1 requires PostgreSQL 15 or later, but the tutorial deployed postgresql-k8s from the 14/edge channel (PostgreSQL 14), so the charm's startup migration failed with "PostgreSQL 15 or later is required". Deploy postgresql-k8s from 16/stable to match the Django requirement, consistent with the upstream 12-factor Django tutorial. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

The registry setup inlined the full Kubernetes manifest as a heredoc, which made the shared setup pages long and hard to read. Move the manifest into docs/reuse/tutorial/registry.yaml and download it with curl in the tutorial, mirroring the upstream 26.04 tutorials. Add a readiness probe so the registry rollout wait reflects actual readiness. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

erinecon

I was able to successfully complete the Django tutorial 🎉

For the other tutorials with a dedicated section to integrate with a database -- I'm consistently seeing a lack of response from the visitors endpoint.

erinecon · 2026-10-21T16:24:57Z

 Check the total number of visitors:

 .. code-block:: bash

-    curl http://flask-hello-world/visitors --resolve flask-hello-world:80:127.0.0.1
+    curl http://flask-hello-world/visitors --resolve flask-hello-world:80:$INGRESS_IP

 This request should return ``1`` after the previous request to the root endpoint.


I tried again today with Flask and Go -- in both attempts, I did not get a response from the visitors endpoint.

I also tried the Go tutorial with both PostgreSQL 14 and 16 -- same lack of response.

Avoids the ca-certificates.crt staging conflict (canonical/rockcraft#1261) that occurs with the ubuntu@24.04 base. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

…tstrap Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

The cilium ingress class treats the ImplementationSpecific path / as an exact match, so endpoints other than / returned an empty 404. Use the /.* pattern and give the ingress more time to come up. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Copilot AI lite review requested due to automatic review settings September 15, 2026 15:21

Copilot started reviewing on behalf of florentianayuwono September 15, 2026 15:22

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docs: use Canonical K8s exclusively in web app how-to guides

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Remove the MicroK8s options from the manage-web-app-charms how-to guides so they use Canonical Kubernetes exclusively, matching the tutorial migration. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

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Merge remote-tracking branch 'origin/main' into docs/migrate-tutorial…

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…s-ck8s-isd-4330 # Conflicts: # docs/howto/manage-web-app-charms/use-web-app-charm.rst

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docs: build the FastAPI tutorial rock on a bare Ubuntu 26.04 base

2d3ca94

Avoids the ca-certificates.crt staging conflict (canonical/rockcraft#1261) that occurs with the ubuntu@24.04 base. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

ci: fix docs spread runner labels and clear containerd before k8s boo…

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…tstrap Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

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florentianayuwono commented Sep 15, 2026 •

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