Requests and Limits

Relevant Documentation

• Resource Requests and Limits

• Create a pod with resource requests that exceed available node resources

• Create a pod with resource requests and limits

Lesson Reference

1. Create a YAML file named big-request-pod.yml and open it for editing:

vi big-request-pod.yml

1. Add the following content to the file:

apiVersion: v1
kind: Pod
metadata:
  name: big-request-pod
spec:
  containers:
  - name: busybox
    image: busybox
    command: ['sh', '-c', 'while true; do sleep 3600; done']
    resources:
      requests:
        cpu: "10000m"
        memory: "128Mi"

1. Save and close the file.

2. Create the pod using the YAML file:

kubectl create -f big-request-pod.yml

1. Check the status of the pod. It should remain in the Pending state since no worker nodes have enough resources to meet the request:

kubectl get pod big-request-pod

• Create a pod with resource requests and limits.

1. Create a YAML file named resource-pod.yml and open it for editing:

vi resource-pod.yml

1. Add the following content to the file:

apiVersion: v1
kind: Pod
metadata:
  name: resource-pod
spec:
  containers:
  - name: busybox
    image: busybox
    command: ['sh', '-c', 'while true; do sleep 3600; done']
    resources:
      requests:
        cpu: "250m"
        memory: "128Mi"
      limits:
        cpu: "500m"
        memory: "256Mi"

1. Save and close the file.

2. Create the pod using the YAML file:

kubectl create -f resource-pod.yml

1. Check the status of the pod:

kubectl get pods