CODEWITHSUNDEEP
kubernetesmicroservicesdevopskubernetes-pod
shujaat
shujaat

Reputation: 383

Kubernetes - Set Pod replication criteria based on memory and cpu usage

I am newbie to Kubernetes world. Please excuse if I am getting anything wrong.

I understand that pod replication is handled by k8s itself. We can also set cpu and memory usage for pods. But is it possible to change replication criteria based on memory and cpu usage? For example if I want to a pod to replicate when its memory/cpu usage reaches 70%.

Can we do it using metrics collected by Prometheus etc ?

Upvotes: 0

Views: 978

Answers (1)

Arghya Sadhu
Arghya Sadhu

Reputation: 44647

You can use horizontal pod autoscaler. From the docs

The Horizontal Pod Autoscaler automatically scales the number of Pods in a replication controller, deployment, replica set or stateful set based on observed CPU utilization (or, with custom metrics support, on some other application-provided metrics). Note that Horizontal Pod Autoscaling does not apply to objects that can't be scaled, for example, DaemonSets.

The Horizontal Pod Autoscaler is implemented as a Kubernetes API resource and a controller. The resource determines the behavior of the controller. The controller periodically adjusts the number of replicas in a replication controller or deployment to match the observed average CPU utilization to the target specified by user

An example from the doc

The following command will create a Horizontal Pod Autoscaler that maintains between 1 and 10 replicas of the Pods. HPA will increase and decrease the number of replicas to maintain an average CPU utilization across all Pods of 50%.

kubectl autoscale deployment php-apache --cpu-percent=50 --min=1 --max=10

Upvotes: 3

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