Kubernetes Cookbook - Second Edition

Configuring a Guaranteed pod

The Guaranteed class has the highest priority of resource QoS classes. In the case of a resource shortage, the Kubernetes scheduler will try to retain the Guaranteed pod to the last.

In order to configure a pod to have the guaranteed class, explicitly set the resource limit and resource request as the same value, or only set the resource limit:

1. Prepare a pod configuration that has the same value for resources.limit and resources.request:

$ cat guaranteed.ymlapiVersion: v1kind: Podmetadata:  name: guaranteed-podspec:  containers:  - name: nginx    image: nginx    resources:      limits:        cpu: 0.3        memory: 350Mi      requests:        cpu: 0.3        memory: 350Mi

2. Create the pod on the chap8-no-qos namespace:

$ kubectl create -f guaranteed.yml ...