Check length limitation (63 characters)

[AndiDog]

Example invalid manifest (see overlong label):

apiVersion: v1
kind: Service
metadata:
  name: mysvc
  labels:
    toolong: abcdeabcdeabcdeabcdeabcdeabcdeabcdeabcdeabcdeabcdeabcdeabcdeabcdeabcdeabcde77
spec:
  ports:
    - name: whatever
      port: 10000
      targetPort: 10000
      protocol: TCP
  selector:
    app: does-not-matter

Unfortunately, kubectl's dry run also doesn't verify this, but maybe you can find a way to check length and character limitations.

$ kubectl apply -f /tmp/toolong.yml --dry-run
service/mysvc created (dry run)

$ kubectl apply -f /tmp/toolong.yml
The Service "mysvc" is invalid: metadata.labels: Invalid value: "abcdeabcdeabcdeabcdeabcdeabcdeabcdeabcdeabcdeabcdeabcdeabcdeabcdeabcdeabcde77": must be no more than 63 characters

$ kubeval /tmp/toolong.yml
The file /tmp/toolong.yml contains a valid Service

$ kubeval --version
Version: 0.13.0
Commit: 635b3c3604ec2d287b0f7e74cb1835df273dcb65
Date: 2019-08-10T09:30:32Z

[rumstead]

Looks like metadata.name is also not caught for cronjobs