Charmcraft -- easily initialise, pack, and publish your charms

Charmcraft is a CLI tool that makes it easy and quick to initialise, package, and publish Kubernetes and machine charms.

Give it a try

Let's use Charmcraft to initialise and pack a Kubernetes charm:

Set up

See Juju | Set things up.
Choose the automatic track and MicroK8s.

Initialise and pack your charm

In your Multipass VM shell, create a charm directory and use Charmcraft to initialise your charm file structure:

mkdir my-new-charm
cd my-new-charm
charmcraft init

This has created a standard charm directory structure:

$ ls -R
.:
CONTRIBUTING.md  README.md        pyproject.toml    src    tox.ini
LICENSE          charmcraft.yaml  requirements.txt  tests

./src:
charm.py

./tests:
integration  unit

./tests/integration:
test_charm.py

./tests/unit:
test_charm.py

Poke around:

Note that the charmcraft.yaml file shows that what we have is an example charm called my-new-charm, which builds on Ubuntu 22.04 and which uses an OCI image resource httpbin from kennethreitz/httpbin.

Note that the src/charm.py file contains code scaffolding featuring the Charm SDK's Ops library for writing charms.

Explore further, start editing the files, or skip ahead and pack the charm:

charmcraft pack

If you didn't take any wrong turn or simply left the charm exactly as it was, this should work and yield a file called my-new-charm_ubuntu-22.04-amd64.charm (the architecture bit may be different depending on your system's architecture). Use this name and the resource from the metadata.yaml to deploy your example charm to your local MicroK8s cloud with Juju:

juju deploy ./my-new-charm_ubuntu-22.04-amd64.charm --resource httpbin-image=kennethreitz/httpbin

Congratulations, you’ve just initialised and packed your first Kubernetes charm using Charmcraft!

But Charmcraft goes far beyond init and pack. For example, when you're ready to share your charm with the world, you can use Charmcraft to publish your charm on Charmhub. Run charmcraft help to preview more.

Clean up

See Juju | Tear things down.
Choose the automatic track.

Next steps

• Read the docs.
• Read our Code of conduct and join our chat and forum or open an issue.
• Read our CONTRIBUTING guide and contribute!