Creating, deploying, updating, and rolling back a Helm chart

As you can see from the previous example, deploying pre-packaged applications with Helm is pretty simple. Deploying your own application is also easy. We start with the following command, which will create a directory in your current directory called myhelmchart and populate it with the relevant files and templates:

$ helm create myhelmchart

By default, the values.yaml file created by this command contains references to a single NGINX pod and creates a ClusterIP service, which is only accessible from within the cluster. The key values from the default file are shown next:

replicaCount: 1
image:
  repository: nginx
service:
  type: ClusterIP

We can easily deploy this new Helm chart using the following command:

$ helm install example ./myhelmchart --set service.type=NodePort

This will override the service.type value seen in the values.yaml file with a NodePort service, so it is now exposed...