enable backoff limit

Dyndns_python_Cron_jobs.yaml

@@ -5,16 +5,6 @@ metadata:
 ---
 apiVersion: batch/v1
 kind: CronJob
-spec:
-  affinity:
-    nodeAffinity:
-      requiredDuringSchedulingIgnoredDuringExecution:
-        nodeSelectorTerms:
-        - matchFields:
-          - key: metadata.name
-            operator: In
-            values:
-            - kube-master
 metadata:
   name: dyndns-pythonrenew
   namespace: dyndns-python
@@ -23,6 +13,7 @@ spec:
   jobTemplate:
     spec:
       ttlSecondsAfterFinished: 100
+      backoffLimit: 4
       template:
         spec:
           containers: