Crossplane: official chart release should include OAM workload/trait controllers

[hongchaodeng]

Currently the chart release include only the AppConfig controller, but not OAM workload/traits.
If users want to deploy OAM apps, they need to do additional cumbersome steps:

git clone [email protected]:crossplane/addon-oam-kubernetes-local.git

kubectl create namespace oam-system

helm install controller -n oam-system ./charts/oam-core-resources/ 

As discussed previously, we want to have the workload/trait controllers in the chart release too. This issue is created to discuss details and track progress.

[hongchaodeng]

cc @negz @hasheddan @ryanzhang-oss @resouer @wonderflow @artursouza

[resouer]

Yes, similar discussion was brought up in slack channel.

Today, we have multiple entries to install Crossplane with OAM core controllers (addon-local/remote), it's painful to re-direct users across different orgs/repos.

We have:

1. https://github.com/oam-dev/crossplane-oam-sample
   
   
   
   1. this one is basically a one-line helm install, very simple
   
   
   2. as mentioned in its README, it's a temporary guidance and designed to be merged into crossplane org ASAP. But for now it seems nowhere to put in.
   
   
2. https://github.com/crossplane/addon-oam-kubernetes-local#getting-started
   
   
   
   1. this one is a "start from source code" version of (1), includes 3 steps of helm install.
   
   
3. https://github.com/crossplane/stack-oam
   
   
   
   1. this one is Stack based installation guide, while seems Crossplane and addon-local/remote still need to be installed by helm?
   
   

Ideally, it would be great to include addon-local/remote in Crossplane helm charts so the installation will be as simple as:

helm install --name crossplane --namespace crossplane-system crossplane-alpha/crossplane --set addon=local

[wonderflow]

I'm working on this, my plan is:

• [x] 1. clean up charts files of addon-oam-kubernetes-local
• [ ] 2. make addon-oam-kubernetes-local as a sub module of crossplane
• [ ] 3. add helm charts files of addon-oam-kubernetes-local to crossplane charts.
• [ ] 4. add charts for addon-oam-kubernetes-remote in crossplane repo.
• [ ] 5. make addon-oam-kubernetes-local and addon-oam-kubernetes-remote configurable by using helm values, addon-oam-kubernetes-local as default.

What about your ideas?

@negz @hongchaodeng @resouer @ryanzhang-oss

[negz]

Per https://github.com/crossplane/oam-kubernetes-runtime/issues/55 we're planning to modularise this, so OAM controllers will be installable without the core Crossplane controllers and vice versa as distinct Helm charts.