Added info about using merged-kubeconfig for joining the cluster.

Signed-off-by: Aswin Surayanarayanan <[email protected]>

README.md

@@ -43,11 +43,11 @@ If `~/.local/bin` is on your PATH, you will then be able to run subctl.
 
 To deploy submariner in a two Kubernetes cluster setup follow the below steps
 
-* Deploy Broker with Dataplane - To deploy the Submariner broker along with the data cluster run
+* Deploy Broker with Dataplane - To deploy the Submariner broker along with the dataplane on the same cluster run:
 ```
 subctl deploy-broker --kubeconfig <PATH-TO-KUBECONFIG-BROKER> --dataplane --clusterid  <CLUSTER-ID-FOR-TUNNELS>
 ```
-
+Note, if --dataplane (enabled by default) was set, it is not required to join this cluster, as it was already joined. It is only required to join the other clusters.
 
 * Join Clusters with Broker - To join all the other clusters with the broker cluster, run using the broker-info.subm generated in the folder from which the previous step was run.
 
@@ -66,17 +66,32 @@ The [Lighthouse](https://github.com/submariner-io/lighthouse) project helps in c
 
 To deploy Submariner with Lighthouse follow the below steps.
 
-* Deploy Broker with Dataplane - To deploy the Submariner broker along with the data cluster, run using the broker-info.subm generated in the folder from which the previous step was run.
+* Create a kubeconfig file which has the context of all the clusters. If KUBECONFIG environment variable set with the path to all clusters (like KUBECONFIG=/home/user/.config/east/auth/kubeconfig-dev:/home/user/.config/west/auth/kubeconfig-dev), you could use the below command.
 ```
-subctl deploy-broker --kubeconfig <PATH-TO-KUBECONFIG-BROKER> --dataplane --service-discovery --broker-cluster-context <BROKER-CONTEXT-NAME> --clusterid  <CLUSTER-ID-FOR-TUNNELS>
+kubectl config view --flatten > merged_kubeconfig
 ```
 
-* Join Clusters with Broker - To join all the other clusters with the broker cluster run using the broker-info.subm generated in the folder from which the previous step was run.
+* Deploy Broker with Dataplane - To deploy the Submariner broker along with the dataplane on the same cluster run:
+```
+subctl deploy-broker --kubecontext <BROKER-CONTEXT-NAME>  --kubeconfig <PATH-TO-KUBECONFIG-BROKER> --dataplane --service-discovery --broker-cluster-context <BROKER-CONTEXT-NAME> --clusterid  <CLUSTER-ID-FOR-TUNNELS>
+```
+Note, if --dataplane (enabled by default) was set, it is not required to join this cluster, as it was already joined. It is only required to join the other clusters.
 
+For example
 ```
-subctl join --kubeconfig <PATH-TO-KUBECONFIG-DATA-CLUSTER> broker-info.subm  --broker-cluster-context <BROKER-CONTEXT-NAME> --clusterid  <CLUSTER-ID-FOR-TUNNELS>
+subctl deploy-broker  --kubecontext west --kubeconfig $WEST  --dataplane --service-discovery --broker-cluster-context west  --clusterid west
 ```
 
+* Join Clusters with Broker - To join all the other clusters with the broker cluster run using the broker-info.subm generated in the folder from which the previous step was run and use the merged kubeconfig created in the first step.
+
+```
+subctl join --kubecontext <DATA-CLUSTER-CONTEXT-NAME> --kubeconfig <MERGED-KUBECONFIG> broker-info.subm  --broker-cluster-context <BROKER-CONTEXT-NAME> --clusterid  <CLUSTER-ID-FOR-TUNNELS>
+```
+
+For example
+```
+subctl join --kubecontext east --kubeconfig merged_kubeconfig broker-info.subm  --broker-cluster-context west --clusterid east
+```
 
 # Development