Update readme with local testing info, clarify kubectl

Signed-off-by: Derek Nola <[email protected]>

README.md

@@ -22,7 +22,7 @@ on processor architecture:
 ## System requirements
 
 Deployment environment must have Ansible 2.4.0+
-Master and nodes must have passwordless SSH access
+Server and agent nodes must have passwordless SSH access
 
 ## Usage
 
@@ -48,7 +48,7 @@ k3s_cluster:
 If needed, you can also edit `vars` section at the bottom to match your environment.
 
 If multiple hosts are in the server group the playbook will automatically setup k3s in HA mode with embedded etcd.
-An odd number of server nodes is recommended (3,5,7). Read the offical documentation below for more information and options.
+An odd number of server nodes is required (3,5,7). Read the offical documentation below for more information and options.
 https://rancher.com/docs/k3s/latest/en/installation/ha-embedded/
 Using a loadbalancer or VIP as the API endpoint is preferred but not covered here.
 
@@ -61,8 +61,19 @@ ansible-playbook playbook/site.yml -i inventory.yml
 
 ## Kubeconfig
 
-To confirm access to your **Kubernetes** cluster use the following:
+After successful bringup, the kubeconfig of the cluster is copied to the control-node and set as default (`~/.kube/config`).
+Assuming you have [kubectl](https://kubernetes.io/docs/tasks/tools/#kubectl) installed, you to confirm access to your **Kubernetes** cluster use the following:
 
 ```bash
 kubectl get nodes
 ```
+
+## Local Testing
+
+A Vagrantfile is provided that provision a 5 nodes cluster using LibVirt or Virtualbox and Vagrant. To use it:
+
+```bash
+vagrant up
+```
+
+By default, each node is given 2 cores and 2GB of RAM and runs Ubuntu 20.04. You can customize these settings by editing the `Vagrantfile`.