Arm-based ECS instance types - Elastic Container Instance

This topic describes how to specify Arm-based Elastic Compute Service (ECS) instance types to create an Elastic Container Instance (ECI) pod. The pod runs on an Arm-based virtual node.

Prerequisites

Arm-based virtual nodes are created in the cluster. For information about how to create an Arm-based virtual node in a cluster, see Add an Arm-based virtual node.

Supported instance families

Arm-based ECS instance types are based on the ARM architecture. Each vCPU corresponds to a physical core of a processor. They deliver stable performance and provide exclusive resources. They are suitable for scenarios such as containers, microservices, website and application servers, high-performance computing, and CPU-based machine learning.

Category	Arm-based instance family
General-purpose instance families	g8y
Compute-optimized instance families	c8y
Memory optimized instance families	r8y

For more information about ECS instance families, see the following topics:

Configurations

In addition to adding the k8s.aliyun.com/eci-use-specs annotation to the metadata in the configuration file of the pod to specify Arm-based ECS instance types, you must set nodeSelector to kubernetes.io/arch: arm64. This allows Kubernetes to schedule the pod to an Arm-based virtual node.

Example:

Make sure that Arm-based virtual nodes exist in the cluster.
```
kubectl get node
```
If the returned node name contains the linux-arm64 suffix, the node is an Arm-based virtual node.
Note
For information about how to create an Arm-based virtual node in a cluster, see Add an ARM-based virtual node.

Specify Arm-based ECS instance types to create the pod.

kubectl create -f arm-test.yaml

Example of the arm-test.yaml file:

apiVersion: apps/v1
kind: Deployment
metadata:
  name: test
  labels:
    app: test
spec:
  replicas: 1
  selector:
    matchLabels:
      app: nginx
  template:
    metadata:
      name: nginx-test
      labels:
        app: nginx
        alibabacloud.com/eci: "true" 
      annotations:
        k8s.aliyun.com/eci-use-specs: "ecs.c8y.large,ecs.g8y.large"   # Specifies Arm-based ECS instance types. You can specify a maximum of five instance types at a time. 
    spec:
      containers:
      - name: nginx
        image: arm64v8/centos:7.9.2009   # Uses an Arm-based image. 
        command: ["sleep"]
        args: ["999999"]
      nodeSelector:
        kubernetes.io/arch: arm64  # Schedules the pod to an Arm-based virtual node.