invalid service/deployment name passes kubeval

[DamonStamper]

I ran a yaml file through kubeval and didn't get any errors. Later when I tried to apply the config to Minikube I got the below

Error from server (Invalid): error when creating "kubernetes.yaml": Service "Foo" is invalid: metadata.name: Invalid value: "Foo": a DNS-1035 label must consist of lower case alphanumeric characters or '-', start with an alphabetic character, and end with an alphanumeric character (e.g. 'my-name',  or 'abc-123', regex used for validation is '[a-z]([-a-z0-9]*[a-z0-9])?')

Error from server (Invalid): error when creating "kubernetes.yaml": Deployment.apps "Bar" is invalid: metadata.name: Invalid value: "Bar": a DNS-1123 subdomain must consist of lower case alphanumeric characters, '-' or '.', and must start and end with an alphanumeric character (e.g. 'example.com', regex used for validation is '[a-z0-9]([-a-z0-9]*[a-z0-9])?(\.[a-z0-9]([-a-z0-9]*[a-z0-9])?)*')

Changing the service/deployment 'metadata' > 'name' per the errors allowed me to apply the yaml file to Minikube.

Kubeval should check service/deployment configurations against the regex listed in the above error.

[garethr]

Could you include a failing definition file? I'll take a look at where this is failing.

kubeval relies exclusively on the Kubernetes OpenAPI descriptions, which might mean this information is missing from those. Or it could be a different local bug.

[DamonStamper]

Sure. Below is a failing definition file. "CapitalName" and "underscore_name" are the source of the errors in this example.

apiVersion: v1
kind: Service
metadata:
  name: CapitalName
  labels:
    app: CapitalName
spec:
  selector:
    app: Invalid_App
  type: LoadBalancer
---
apiVersion: v1
kind: Service
metadata:
  name: underscore_name
  labels:
    app: underscore_name
spec:
  selector:
    app: underscore_name
  type: LoadBalancer
---
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: 
  labels:
    app: Invalid_App
spec:
  template:
    metadata:
      labels:
        app: Invalid_App
    spec:
      containers:
      - name: CapitalName
        image: CapitalImage
        imagePullPolicy: Always
      - name: underscore_name
        image: underscore_image
        imagePullPolicy: Always