K8s CronJob with execution timeout implemented via livenessProbe

cronjob_with_exec_timeout.yaml

---
apiVersion: batch/v1beta1
kind: CronJob
metadata:
  name: do-something-job
  namespace: scheduled-tasks
spec:
  schedule: "*/2 * * * *"
  successfulJobsHistoryLimit: 3
  failedJobsHistoryLimit: 3
  # "concurrencyPolicy" should be set to "Forbid"
  # otherwise "successfulJobsHistoryLimit" and "failedJobsHistoryLimit" are meaningless
  # use "concurrencyPolicy: Replace" if you don't need to retain job history
  concurrencyPolicy: Forbid
  jobTemplate:
    spec:
      backoffLimit: 3
      template:
        spec:
          # using "restartPolicy: Never" ensures failed pods are around to check logs, etc..
          # job controller will start new pods to replace failed ones
          restartPolicy: Never
          # for the sake of this exercise low "terminationGracePeriodSeconds" makes sense
          # elsewhere, higher value should be used
          terminationGracePeriodSeconds: 2
          containers:
          - name: task1
            imagePullPolicy: Always
            image: alpine:3.8
            livenessProbe:
              exec:
                command:
                - sh
                - -c
                - >
                  start_time="$(cat /start_time)";
                  now_time="$(date +%s)";
                  elapsed_time=$((${now_time}-${start_time}));
                  [[ ${EXEC_TIMEOUT} -gt ${elapsed_time} ]] &&
                  date +%s > /livenessProbe
              initialDelaySeconds: 3
              periodSeconds: 2
              timeoutSeconds: 2
              successThreshold: 1
              failureThreshold: 1
            resources:
              limits:
                memory: "256Mi"
            env:
            - name: EXEC_TIMEOUT
              value: "15"
            command:
            - sh
            - -c
            - >
              date +%s > /start_time;
              function doWork() {
                max=$((RANDOM%15));
                while [[ ${count:-0} -lt ${max} ]]; do echo $count; let ++count; sleep 1; done
              };
              doWork && echo >&2 "All Done"