Variable substitution in the new kubernetes kustomize support (since 1.14.0): kubectl apply -k ./

You have to create a kustomization.yaml file containing the customizations.

i.e:

# kustomization.yamlbases:- ../baseimages:  - name: nginx-pod    newTag: 1.15    newName: nginx-pod-2

And for the templates, you create a base folder containing the kustomization.yaml with reference to the deployment and dependencies, i.e:

# ../base/kustomization.yamlresources:- deployment.yaml

and

# ../base/deployment.yamlapiVersion: apps/v1kind: Deploymentmetadata:  name: nginx-deployment  labels:    app: nginxspec:  selector:    matchLabels:      app: nginx  template:    metadata:      labels:        app: nginx    spec:      containers:      - name: nginx        image: nginx-pod

Run the command:

kubectl apply -k

The above command will compile the customization and generate the following yaml to be applied to the cluster:

# Modified Base ResourceapiVersion: apps/v1kind: Deploymentmetadata:  labels:    app: nginx  name: nginx-deploymentspec:  selector:    matchLabels:      app: nginx  template:    metadata:      labels:        app: nginx    spec:      containers:      # The image image tag has been changed for the container      - name: nginx        image: nginx-pod-2:1.15