2020-10-06 ML: add readme installation section

README.md

@@ -75,3 +75,64 @@ switch context:
 ```
 $ kubectl config use-context <context-name>
 ```
+
+## Installation
+
+### KubeFed client (kubefedctl)
+
+To install the KubeFed client follow the below command in your local machine:
+
+```
+$ VERSION=0.2.0-alpha.1
+$ OS=linux
+$ ARCH=amd64
+$ curl -LO https://github.com/kubernetes-sigs/kubefed/releases/download/v${VERSION}/kubefedctl-${VERSION}-${OS}-${ARCH}.tgz
+$ tar -zxvf kubefedctl-*.tgz
+$ chmod u+x kubefedctl
+$ sudo mv kubefedctl /usr/local/bin/ # make sure the location is in the PATH
+```
+
+**N.B.**: the versions we tested are: 0.1.0-rc6 and 0.2.0-alpha.1, you can try the latest version.
+
+### KubeFed server (Control Plane)
+
+To install the Controll Plane, switch to the host context and configuring the RBAC role for Helm (in this case we use Helm v2):
+
+```
+$ cat << EOF | kubectl apply -f -
+	apiVersion: v1
+	kind: ServiceAccount
+	metadata:
+	  name: tiller
+	  namespace: kube-system
+	---
+	apiVersion: rbac.authorization.k8s.io/v1
+	kind: ClusterRoleBinding
+	metadata:
+	  name: tiller
+	roleRef:
+	  apiGroup: rbac.authorization.k8s.io
+	  kind: ClusterRole
+	  name: cluster-admin
+	subjects:
+	  - kind: ServiceAccount
+	    name: tiller
+	    namespace: kube-system
+	EOF
+```
+
+helm init command:
+```
+$ helm init --service-account tiller
+```
+
+Now it is possible install the Control Plane on the Host Cluster:
+
+```
+$ helm repo add kubefed-charts https://raw.githubusercontent.com/kubernetes-sigs/kubefed/master/charts
+$ helm install kubefed-charts/kubefed --name kubefed --version=0.2.0-alpha.1 --namespace kube-federation-system
+```
+
+**N.B.**: use the same version for client and server.
+
+**N.B.**: in this way the Control Plane can find Federated resources in each namespace, to limit this action in a specific namespace add the parameter `--set global.scope=Namespaced`.