model-registry: update the installation guide (#4042)

I found installing model registry from the instructions on the website
to be rather hard to do. The instructions don't actually have all the
steps needed, so it sent me to the README in the manifests repo. Which,
confusingly, sent me right back to the website. Neither document is
entirely complete so I had to coble together bits from both places.

I'm assuming these instructions are primarily useful to existing
Kubeflow users who want to try out model registry so I've rewritten the
"Installing on Kubeflow Platform" section with the idea to get those
users up and running quickly. I'm further assuming that these users will
want the UI (I mean, it's a good UI, who wouldn't?) so we can cut the
"if you want the UI verbage" and simplify some of the commands.

Signed-off-by: Paul Boyd <pboyd@redhat.com>

content/en/docs/components/model-registry/installation.md

@@ -24,34 +24,56 @@ The best option for you will depend on your specific requirements.
 
 Kubeflow Model Registry is available as an opt-in alpha component in Kubeflow Platform 1.9+, see [Installing Kubeflow](/docs/started/installing-kubeflow/) to learn more about deploying the Kubeflow Platform.
 
-> **Note:** If you are planning to use the Kubeflow UI, please see the section below on installing Model Registry on a Kubeflow Profile. This will ensure proper integration with the Kubeflow Platform and Dashboard.
+These instructions assume that you've installed Kubeflow from the [manifests](https://github.com/kubeflow/manifests/), if you're using a distribution consult its documentation instead.
 
-If you have deployed the Kubeflow manifests, you may follow [these instructions](https://github.com/kubeflow/manifests/tree/master/apps/model-registry/upstream#readme) to deploy Model Registry; please raise any feedback on [`kubeflow/model-registry`](https://github.com/kubeflow/model-registry/issues).
+Clone the `model-registry` repository:
 
-To deploy Model Registry UI, you just need to follow the [UI section](https://github.com/kubeflow/manifests/tree/master/apps/model-registry/upstream#ui-installation) under the Model Registry installation guide targeting a integrated install.
-
-#### Installing on a Kubeflow Profile
-
-Kubeflow Central Dashboard uses [Profiles](/docs/components/central-dash/profiles/) to handle user namespaces and permissions. By default, the manifests deploy the Model Registry in the `kubeflow` namespace, to install a compatible version of Model Registry for Kubeflow, you should first head into the [istio overlay](https://github.com/kubeflow/manifests/tree/master/apps/model-registry/upstream/options/istio) and run the following commands:
-
-```shell
-kustomize set namespace <your-profile>
-kubectl apply -k .
+```sh
+git clone --depth 1 -b v{{% model-registry/latest-version %}} https://github.com/kubeflow/model-registry.git
 ```
 
-Then head into the [db overlay](https://github.com/kubeflow/manifests/tree/master/apps/model-registry/upstream/overlays/db) and run the following commands:
+Switch to the `manifests/kustomize` for the remaining commands in this section:
 
-```shell
-kustomize set namespace <your-profile>
-kubectl apply -k .
+```sh
+cd model-registry/manifests/kustomize
+```
+
+Kubeflow Central Dashboard uses [Profiles](/docs/components/central-dash/profiles/) to handle user namespaces and permissions. By default, the manifests deploy the Model Registry in the `kubeflow` namespace, to install a compatible version of Model Registry for Kubeflow, you should instead deploy to your profile namespace. Use the following command the modify the manifests for your profile:
+
+```sh
+PROFILE_NAME=<your-profile>
+for DIR in options/istio overlays/db ; do (cd $DIR; kustomize edit set namespace $PROFILE_NAME); done
+```
+
+{{% alert title="Note" color="info" %}}
+> If you're not sure of the profile name, you can find it in the name space drop-down on the Kubeflow Dashboard.
+{{% /alert %}}
+
+Now apply the manifests:
+
+```sh
+kubectl apply -k overlays/db
+kubectl apply -k options/istio
+kubectl apply -k options/ui/overlays/istio
+```
+
+It may take a few minutes for the pods to be ready, you can check the status of the pods in your profile namespace:
+
+```sh
+kubectl get pods -n $PROFILE_NAME -w
+```
+
+Finally, configure a Model Registry link in the Kubeflow Dashboard:
+
+```sh
+kubectl get configmap centraldashboard-config -n kubeflow -o json | jq '.data.links |= (fromjson | .menuLinks += [{"icon": "assignment", "link": "/model-registry/", "text": "Model Registry", "type": "item"}] | tojson)' | kubectl apply -f - -n kubeflow
 ```
 
 ### Standalone installation
 
-If you want to install Model Registry separately from Kubeflow, or to get a later version
-of Model Registry, you can install the Model Registry manifests directly from the [Model Registry repository](https://github.com/kubeflow/model-registry).
+It is also possible to install Model Registry as a standalone deployment, separately from Kubeflow.
 
-By default, the manifests deploy the Model Registry in the `kubeflow` namespace;
+By default, the [manifests](https://github.com/kubeflow/model-registry/tree/v{{% model-registry/latest-version %}}/manifests/kustomize) deploy the Model Registry in the `kubeflow` namespace;
 you must ensure the `kubeflow` namespace is available (for example: `kubectl create namespace kubeflow`)
 or modify [the kustomization file](https://github.com/kubeflow/model-registry/blob/v{{% model-registry/latest-version %}}/manifests/kustomize/overlays/db/kustomization.yaml#L3) to your desired namespace.
 
@@ -80,6 +102,12 @@ kubectl apply -k "https://github.com/kubeflow/model-registry/manifests/kustomize
 
 ## Check Model Registry setup
 
+{{% alert title="Note" color="warning" %}}
+> The commands and addresses in this section assume you've installed
+> Model Registry in the `kubeflow` namespace. Adjust the commands appropriately
+> if you installed into another namespace.
+{{% /alert %}}
+
 You can check the status of the Model Registry deployment with your Kubernetes tooling, or for example with:
 
 ```shell