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A Charmed Operator demonstration for Operator Day 2021, hosted by Canonical

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<h1 align="center">Operator Day 2021 Demo Charm</h1>

<p align="center">
<img width="500px" height="281px" src="https://res.cloudinary.com/canonical/image/fetch/f_auto,q_auto,fl_sanitize,c_fill,w_720/https://ubuntu.com/wp-content/uploads/1957/Title-Cards-20.png"/>
<p>
  
<h2 align="center">Contents</h2>

> [!WARNING]  
> This charm is now quite out of date. Feel free to follow the example from the YouTube video, but
> note that charming practices have evolved. For more information, see https://juju.is/docs/sdk,
> or get in touch with us on the [Ubuntu Matrix](https://ubuntu.com/community/communications/matrix)!

<p align="center">
  <a href="#overview">Overview</a><br/>
  <a href="#quickstart">Quickstart</a><br/>
  <a href="#development-setup">Development Setup</a><br/>
  <a href="#build">Build and Deploy Locally</a><br/>
  <a href="#testing">Testing</a><br/>
  <a href="#help">Get Help & Community</a><br/>
  <a href="#more">More Information/Related</a><br/>
</p>

<h2 align="center" id="overview">Overview</h2>

This [charm](https://charmhub.io/hello-kubecon) is a demonstration of a charm
implemeting the sidecar pattern used during
[Operator Day 2021](https://www.linkedin.com/events/6788422954821656577/). You
can grab the slides from the demo [here](https://jnsgr.uk/demo-slides).

The charm is written using the
[Charmed Operator Framework](https://github.com/canonical/operator).
It deploys [gosherve](https://github.com/jnsgruk/gosherve), relying upon the
charm container to populate a shared volume with a simple
[landing-page](https://github.com/canonical-web-and-design/kubecon-2021/) style
website and configure the app before it is started.

Slides for the demo [are available](https://jnsgr.uk/demo-slides) and there
is a supporting [Github Gist](https://jnsgr.uk/demo-gist) that contains copy-and-
pastable content from the slide deck.

The finished charm is published [on Charmhub](https://charmhub.io/hello-kubecon).

The charm will:

- Deploy a container running [gosherve](https://github.com/jnsgruk/gosherve)
- Fetch a website [from Github](https://jnsgr.uk/demo-site-repo)
- Place the downloaded file in a storage volume
- Expose a `redirect-map` config item to configure
  [gosherve](https://github.com/jnsgruk/gosherve) redirects
- Expose a `pull-site` action to pull the latest version of the test site
- Utilise an ingress relation using the
  [`nginx-ingress-integrator`](https://charmhub.io/nginx-ingress-integrator) library

Each branch of this repository represents a different stage from the demonstration:

- [`1-specify-workload`](https://github.com/jnsgruk/hello-kubecon/tree/1-specify-workload)
- [`2-handle-configuration`](https://github.com/jnsgruk/hello-kubecon/tree/2-handle-configuration)
- [`3-storage`](https://github.com/jnsgruk/hello-kubecon/tree/3-storage)
- [`4-action`](https://github.com/jnsgruk/hello-kubecon/tree/4-action)
- [`5-ingress`](https://github.com/jnsgruk/hello-kubecon/tree/5-ingress)
- [`master`](https://github.com/jnsgruk/hello-kubecon/)

<h2 align="center" id="quickstart">Quickstart</h2>

Assuming you already have Juju installed and bootstrapped on a cluster (if you
do not, see the next section):

```bash
# Create a juju model
$ juju add-model dev
# Deploy the charm
$ juju deploy hello-kubecon
# Deploy the ingress charm
$ juju deploy traefik-k8s --trust
$ juju config traefik-k8s external_hostname=juju.local
$ juju config traefik-k8s routing_mode=subdomain
# Relate our app to the ingress
$ juju relate hello-kubecon traefik-k8s
# Wait for the deployment to complete
$ watch -n1 --color juju status --color
# Add an entry to /etc/hosts
$ echo "<traefik-k8s-address> dev-hello-kubecon.juju.local" | sudo tee -a /etc/hosts
```

You should be able to visit [http://dev-hello-kubecon.juju.local](http://dev-hello-kubecon.juju.local)
in your browser.

<h2 align="center" id="development-setup">Development Setup</h2>

To set up a local test environment with [MicroK8s](https://microk8s.io):

```bash
# Install MicroK8s
$ sudo snap install --classic microk8s
# Wait for MicroK8s to be ready
$ sudo microk8s status --wait-ready
# Enable features required by Juju controller & charm
$ sudo microk8s enable storage dns metallb
# (Optional) Alias kubectl bundled with MicroK8s package
$ sudo snap alias microk8s.kubectl kubectl
# (Optional) Add current user to 'microk8s' group
# This avoid needing to use 'sudo' with the 'microk8s' command
$ sudo usermod -aG microk8s $(whoami)
# Activate the new group (in the current shell only)
# Log out and log back in to make the change system-wide
$ newgrp microk8s
# Install Charmcraft
$ sudo snap install charmcraft
# Install juju
$ sudo snap install --classic juju
# Bootstrap the Juju controller on MicroK8s
$ juju bootstrap microk8s micro
# Add a new model to Juju
$ juju add-model dev
```

<h2 align="center" id="build">Build and Deploy Locally</h2>

```bash
# Clone the charm code
$ git clone https://github.com/jnsgruk/hello-kubecon && cd hello-kubecon
# Build the charm package
$ charmcraft pack
# Create a juju model
$ juju add-model dev
# Deploy!
$ juju deploy ./hello-kubecon_ubuntu-20.04-amd64.charm --resource gosherve-image=jnsgruk/gosherve:latest
# Deploy the ingress charm
$ juju deploy traefik-k8s --trust
$ juju config traefik-k8s external_hostname=juju.local
$ juju config traefik-k8s routing_mode=subdomain
# Relate our app to the ingress
$ juju relate hello-kubecon traefik-k8s
# Wait for the deployment to complete
$ watch -n1 --color juju status --color
# Add an entry to /etc/hosts
$ echo "<traefik-k8s-address> dev-hello-kubecon.juju.local" | sudo tee -a /etc/hosts
```

You should be able to visit [http://dev-hello-kubecon.juju.local](http://dev-hello-kubecon.juju.local)
in your browser.

<h2 align="center" id="testing">Testing</h2>

```bash
# Clone the charm code
$ git clone https://github.com/jnsgruk/hello-kubecon && cd hello-kubecon
# Install python3-virtualenv
$ sudo apt update && sudo apt install -y python3-virtualenv
# Create a virtualenv for the charm code
$ virtualenv venv
# Activate the venv
$ source ./venv/bin/activate
# Install dependencies
$ pip install -r requirements-dev.txt
# Run the tests
$ ./run_tests
```

<h2 align="center" id="help">Get Help & Community</h2>

If you get stuck deploying this charm, or would like help with charming
generally, come and join the charming community!

- [Community Discourse](https://discourse.charmhub.io)
- [Community Chat](https://chat.charmhub.io/charmhub/channels/creating-charmed-operators)

<h2 align="center" id="more">More Information/Related</h2>

Below are some links related to this demonstration:

- [Charmed Operator Framework Documentation](https://juju.is/docs/sdk)
- [Charmed Operator Framework Source](https://github.com/canonical/operator)
- [Juju Documentation](https://juju.is/docs/olm)
- [Charmhub](https://charmhub.io)
- [Pebble](https://github.com/canonical/github)
- [The Future of Charmed Operators on Kubernetes](https://discourse.charmhub.io/t/4361)

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