Compare date and time of all nodes from a Kubernetes container

datecheck.yaml

---
apiVersion: apps/v1beta2
kind: DaemonSet
metadata:
  name: datetimecheck
spec:
  selector:
    matchLabels:
      name: datetimecheck
  template:
    metadata:
      labels:
        name: datetimecheck
    spec:
      initContainers:
      - name: datechecker
        image: busybox
        command: ["sh"]
        args: ["-c", "hostname; echo \"  Website\" $(wget https://google.com -qS 2>&1 | grep -i date | head -1); date -u +\"Container Date: %a, %d %b %Y %T %Z\"; echo"]

      containers:
      - name: pause
        image: gcr.io/google_containers/pause

Simple yaml file for k8s to create a Daemonset that will run on all of the nodes and check between internet time and local container time derived from k8s node.

kubectl apply -f datecheck.yaml
or

kubectl apply -f \
https://gist.githubusercontent.com/JohnKDay/3318b27b45be4f9f7be4bcc8fce7965b/raw/a9b2c17ebf5da4f0d975847ff6933a1b38963b70/datecheck.yaml

(above script in raw mode)

after a bit check the logs

kubectl logs -l name=datetimecheck --all-containers

Response should look like:

datetimecheck-gd6z2
  Website Date: Sat, 18 Jan 2020 00:40:31 GMT
Container Date: Sat, 18 Jan 2020 00:40:30 UTC

datetimecheck-gpj5l
  Website Date: Sat, 18 Jan 2020 00:40:31 GMT
Container Date: Sat, 18 Jan 2020 00:40:30 UTC

datetimecheck-h8fkr
  Website Date: Sat, 18 Jan 2020 00:40:31 GMT
Container Date: Sat, 18 Jan 2020 00:40:30 UTC

datetimecheck-jpm66
  Website Date: Sat, 18 Jan 2020 00:40:31 GMT
Container Date: Sat, 18 Jan 2020 00:40:31 UTC

datetimecheck-qklcl
  Website Date: Sat, 18 Jan 2020 00:40:31 GMT
Container Date: Sat, 18 Jan 2020 00:40:30 UTC

And don't forget to delete the Daemonset when finished

kubectl delete daemonsets datetimecheck
or delete pods to rerun
kubectl delete pods -l name=datetimecheck