Exercise

  1. Create the specification of a Pod named mongo and based on the mongo:5.0 image

  2. Modify the specification to make sure the container has 64Mi of RAM and 30m cpu allocated

  3. Modify the specification to make sure the container cannot use more than 128Mi and 50m cpu

  4. Create the Pod

  5. Retrieve the content of the Pod’s resources with the jsonpath output

  6. Delete the Pod

Documentation

https://kubernetes.io/docs/concepts/configuration/manage-resources-containers/#example-1


Solution
  1. Create the specification of a Pod named mongo and based on the mongo:5.0 image
kubectl run mongo --image=mongo:5.0 --dry-run=client -o yaml > mongo.yaml
  1. Modify the specification to make sure the container has 64Mi of RAM and 30m cpu allocated
apiVersion: v1
kind: Pod
metadata:
  creationTimestamp: null
  labels:
    run: mongo
  name: mongo
spec:
  containers:
  - image: mongo:5.0
    name: mongo
    resources:
      requests:
        cpu: 30m
        memory: 64Mi
  1. Modify the specification to make sure the container cannot use more than 128Mi and 50m cpu
apiVersion: v1
kind: Pod
metadata:
  creationTimestamp: null
  labels:
    run: mongo
  name: mongo
spec:
  containers:
  - image: mongo:5.0
    name: mongo
    resources:
      requests:
        cpu: 30m
        memory: 64Mi
      limits:
        cpu: 50m
        memory: 128Mi
  1. Create the Pod
k apply -f mongo.yaml
  1. Retrieve the content of the Pod’s resources with the jsonpath output
k get po/mongo -o jsonpath={.spec.containers[0].resources}
{"limits":{"cpu":"50m","memory":"128Mi"},"requests":{"cpu":"30m","memory":"64Mi"}}
  1. Delete the Pod
k delete -f mongo.yaml