Before we move on, let's take a look at these three concepts in action. Kubernetes ships with a number of examples installed, but we will create a new example from scratch to illustrate some of the concepts.
We already created a pod definition file, but as you learned, there are many advantages to running our pods via replication controllers. Again, using the book-examples/02_example folder we made earlier, we will create some definition files and start a cluster of Node.js servers using a replication controller approach. Additionally, we'll add a public face to it with a load-balanced service.
Use your favorite editor to create the following file:
apiVersion: v1
kind: ReplicationController
metadata:
name: node-js
labels:
name: node-js
spec:
replicas: 3
selector:
name: node-js
template:
metadata:
labels:
name: node-js
spec:
containers:
- name: node-js
image: jonbaier/node-express-info...
