k8s-v2-registry-POC

0. Go through the README steps in k8s-droidcraft/prepare/ to get kubernetes up and running(bare metal in this case).

1. Both v2 registries will share one redis instance.
   https://github.com/Riptawr/k8s-droidcraft/blob/master/redis/redis.yml - set up redis, use persistent volume insreated of emptydir if needed. Emptydir is used here for testing.

2. Set up persistent volume and persistent voume claim to be used by docker registry replication controller
   https://github.com/Riptawr/k8s-droidcraft/tree/master/volumes This should be a storage shared among the kubernetes nodes, I used ASW EFS (nfs 4.1) for the sake of testing.
   Change the path in the yml files if needed.

3. Create registry rc https://github.com/Riptawr/k8s-droidcraft/blob/master/registry_v2/reg_rc.yml (change HTTP-SECRET) and the registry service https://github.com/Riptawr/k8s-droidcraft/blob/master/registry_v2/reg_svc.yml

4. We need nginx ingress controller to track via api which registry endpoints are alive and update its config accordingy. https://github.com/Riptawr/k8s-droidcraft/tree/master/nginx_rbac/nginx Once you have it up and running, ingress resource for registry can be created - https://github.com/Riptawr/k8s-droidcraft/blob/master/registry_v2/reg_ingress.yml Note that in production we need to specify a proper hostname for the registry in the ingress yml file.

5. Once ingress resource is created, nginx config is reloaded.
   Configuration of the registry in nginx can be checked in ingress kubectl exec --namespace nginx-ingress nginx-ingress-controller-5bd4fc7ccf-ptvcb cat /etc/nginx/nginx.conf

6. We can manage the config of the registry in nginx via ingress resource annotations (check ingress yml once again) , or via configmap - https://github.com/Riptawr/k8s-droidcraft/tree/master/configmap Annotations should take precedence.

7. Note that https://github.com/Riptawr/k8s-droidcraft/blob/master/registry_v2/reg_ingress.yml has an ingress class specified, and it is also present in the nginx controller config args https://github.com/Riptawr/k8s-droidcraft/blob/master/nginx_rbac/nginx/nginx-ingress-controller.yml This is what makes nginx take care of this ingress resource.