Container Service for Kubernetes:Run a Job with ECI

Step 1: Create a namespace and add the ECI label

kubectl create ns vk
kubectl label namespace vk alibabacloud.com/eci=true

All pods in the vk namespace run as ECI pods on virtual nodes.

Step 2: Create the Job

1. Save the following YAML as job.yaml. This Job uses 16 CPU cores and 32 GiB memory to compute pi to 2,000 digits.

   apiVersion: batch/v1
   kind: Job
   metadata:
     name: pi
     namespace: vk     # Pods in this namespace are scheduled to Elastic Container Instances
   spec:
     template:
       spec:
         containers:
         - name: pi
           image: registry.cn-shanghai.aliyuncs.com/eci_open/perl:5.32
           command: ["perl",  "-Mbignum=bpi", "-wle", "print bpi(2000)"]
           resources:
             requests:
               cpu: 16
               memory: 32Gi
         restartPolicy: Never
     backoffLimit: 4

2. Apply the YAML file.

   kubectl -n vk apply -f job.yaml

Step 3: Verify the Job completed

Check the pod status.

kubectl -n vk get pod -o wide

A Completed status and a virtual-kubelet node name prefix confirm the pod ran on a virtual node.

NAME       READY   STATUS      RESTARTS   AGE   IP              NODE                            NOMINATED NODE   READINESS GATES
pi-zw2lc   0/1     Completed   0          15m   192.168.XX.XX   virtual-kubelet-cn-shanghai-b   <none>           <none>

Step 4: Confirm billing has stopped

Inspect the pod events.

kubectl -n vk describe pod <pod-name>

A StopCharge event in the Events section confirms the ECI pod finished and billing stopped.

Events:
  Type     Reason            Age   From        Message
  ----     ------            ----  ----        -------
  Warning  ImageCacheMissed  16m   EciService  [eci.imagecache]Missed image cache.
  Normal   Pulling           16m   kubelet     Pulling image "registry.cn--shanghai.aliyuncs.com/eci_open/perl:5.32"
  Normal   Pulled            15m   kubelet     Successfully pulled image "registry.cn-shanghai.aliyuncs.com/eci_open/perl:5.32" in 12.951s (12.951s including waiting). Image size: 336066994 bytes.
  Normal   Created           15m   kubelet     Created container: pi
  Normal   Started           15m   kubelet     Started container pi
  Normal   StopCharge        15m   EciService  [eci.containergroup]The charge of current ECI instance has been stopped, but the related resources are still being cleaned.

ECI pods are billed by actual resource usage and stop billing on completion. See Billing of elastic container instances and Lifecycle of elastic container instance pods.