cnat (cloud native at) command extends Kubernetes to run a command at a certain point in time in the future, akin to the Linux at command.
Let's say you want to execute
echo YAY at 2am on 3rd July 2019. Here's what you would do (given the
cnat CRD has been registered and the according operator is running):
$ cat runat.yaml apiVersion: cnat.programming-kubernetes.info/v1alpha1 kind: At metadata: name: example-at spec: schedule: "2019-07-03T02:00:00Z" command: "echo YAY" $ kubectl apply -f runat.yaml cnat.programming-kubernetes.info/example-at created $ kubectl get at NAME AGE example-at 20s $ kubectl logs example-at-pod YAY
Note that the execution time (
schedule) is given in UTC.
In order to use the cnat custom resource, you have to run the respective custom controller, implemented here in three different ways: