Chapter 40. Creating an object from a custom resource definition

Create a YAML definition for the custom object. In the following example definition, the cronSpec and image custom fields are set in a custom object of kind CronTab. The kind comes from the spec.kind field of the custom resource definition object.

apiVersion: "stable.example.com/v1" 1
kind: CronTab 2
metadata:
  name: my-new-cron-object 3
  finalizers: 4
  - finalizer.stable.example.com
spec: 5
  cronSpec: "* * * * /5"
  image: my-awesome-cron-image

After you create the object file, create the object:

oc create -f <file-name>.yaml

To get information on a specific kind of custom resource, enter:

oc get <kind>

For example:

oc get crontab

NAME                 KIND
my-new-cron-object   CronTab.v1.stable.example.com

Note that resource names are not case-sensitive, and you can use either the singular or plural forms defined in the CRD, as well as any short name. For example:

oc get crontabs
oc get crontab
oc get ct

You can also view the raw YAML data for a custom resource:

oc get <kind> -o yaml

oc get ct -o yaml

apiVersion: v1
items:
- apiVersion: stable.example.com/v1
  kind: CronTab
  metadata:
    clusterName: ""
    creationTimestamp: 2017-05-31T12:56:35Z
    deletionGracePeriodSeconds: null
    deletionTimestamp: null
    name: my-new-cron-object
    namespace: default
    resourceVersion: "285"
    selfLink: /apis/stable.example.com/v1/namespaces/default/crontabs/my-new-cron-object
    uid: 9423255b-4600-11e7-af6a-28d2447dc82b
  spec:
    cronSpec: '* * * * /5' 1
    image: my-awesome-cron-image 2