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Kubernetes Cronjob Resource Limits | How-to Guide

A CronJob in Kubernetes is a controller. It creates jobs on a regular schedule and is like the cron job option in Unix-like operating systems.

At the scheduled time, the CronJob controller will create a new Job object. This in turn creates one or more pods to carry out the specified task.

When we configure resource limits for CronJobs in Kubernetes, we have to mention the amount of CPU and memory that each pod is allowed to use. This makes sure that the pods do not use additional resources.

How to Set Resource Limits for CronJobs

To set resource limits for CronJobs in Kubernetes, we need to focus on both CPU and memory allocations. Let’s break down the key components:

• CPU and Memory Resource Requests

  Resource requests mention the amount of CPU and memory that a pod demands from the Kubernetes scheduler. These requests help the scheduler in placing pods on nodes with enough resources to meet their requirements.

  For instance, we can define that each pod spawned by the CronJob requests 0.5 CPU cores and 512 MB of memory.
• CPU and Memory Resource Limits:

  Resource limits set the maximum amount of CPU and memory that a pod can consume. If a pod surpasses these limits, Kubernetes may take corrective actions.

  For example, we can set limits for each CronJob pod at 1 CPU core and 1 GB of memory.
• Setting Resource Limits in CronJob Manifest:

  To enforce resource limits for CronJobs, we can include the ‘resources’ field in the pod template specification of the CronJob manifest.

  For example:

  
apiVersion: batch/v1beta1
kind: CronJob
metadata:
name: example-cronjob
spec:
schedule: "*/1 * * * *"
jobTemplate:
spec:
template:
spec:
containers:
- name: example-container
image: nginx
resources:
requests:
memory: "512Mi"
cpu: "500m"
limits:
memory: "1Gi"
cpu: "1"
restartPolicy: OnFailure


  Here, each pod spawned by the CronJob requests 0.5 CPU cores (“500m”) and 512 MB of memory (“512Mi”). The pod’s resource limits are set to 1 CPU core (“1”) and 1 GB of memory (“1Gi”).

Setting resource limits for CronJobs makes sure that pods operate within the available resources on Kubernetes nodes.

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Conclusion

In brief, our Support Experts introduced us to Kubernetes Cronjob Resource Limits and how to set them.