run ocm control plane as a standalone binary

[qiujian16]

It will be interesting to run ocm control plane in stand alone mode. It will involve integrating apiserver/controller/etcd in one single binary. We should also disable unused APIs on apiserver (e.g. nodes, pods etc.). We can start with a prototype and check how kcp does this.

cc @yue9944882 @ycyaoxdu
/kind feature

[yue9944882]

@qiujian16 thanks, another obstacle in standalone mode is how to scale out etcd. i think we could probably start by leveraging an etcd-operator to make it dynamically scalable? or an one-replica etcd in the first phase, then we can opt-in to install an etcd-operator to manage/adopt the etcd.

[qiujian16]

leaving items to resolve:

• refine the video demo and upload to youtube. @ycyaoxdu
• resolve unexpected informer error. @ycyaoxdu
• allow the control plane to use external etcd @ycyaoxdu
• consider create a repo in ocm or using ocm/ocm to host the control plane code @qiujian16
• identify gap in the current code @ycyaoxdu

[ycyaoxdu]

video uploaded. https://www.youtube.com/watch?v=fTaU9dncgHY @qiujian16

[ycyaoxdu]

the unexpected informer error bug fixed @qiujian16

[ycyaoxdu]

use external etcd allowed @qiujian16

[ycyaoxdu]

add TODO(ycyaoxdu) comment to label refinable codes https://github.com/ycyaoxdu/ocm-control-plane/commit/e5bc0ca4d468c06f94e8c8a58313cc6d885990a9 @qiujian16

[qiujian16]

this is done

/close

[openshift-ci]

@qiujian16: Closing this issue.

In response to this:

this is done

/close

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