AWS EKS 安装Auto Scaler

1. 为你的node group 加上 以下的tag

tag title	tag value
k8s.io/cluster-autoscaler/<cluster-name>	owned
k8s.io/cluster-autoscaler/enabled	TRUE

2. 创建集群IAM OIDC身份提供商, 如果你已经创建了就无需再创建

eksctl utils associate-iam-oidc-provider --cluster yourClusterName --approve

3. 把以下这个policy 存在你的本机，名为autoscaler.json

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Action": [
                "autoscaling:DescribeAutoScalingGroups",
                "autoscaling:DescribeAutoScalingInstances",
                "autoscaling:DescribeLaunchConfigurations",
                "autoscaling:DescribeTags",
                "autoscaling:SetDesiredCapacity",
                "autoscaling:TerminateInstanceInAutoScalingGroup",
                "ec2:DescribeLaunchTemplateVersions"
            ],
            "Resource": "*",
            "Effect": "Allow"
        }
    ]
}

4. 使用aws cli 根于步骤3的文件创建policy

aws iam create-policy \
    --policy-name AmazonEKSClusterAutoscalerPolicy \
    --policy-document file://cluster-autoscaler-policy.json

5. 创建service account 把 刚刚创建的policy给关联起来

eksctl create iamserviceaccount \
  --cluster=eks集群名 \
  --namespace=kube-system \
  --name=cluster-autoscaler \
  --attach-policy-arn=arn:aws:iam::账号号码:policy/AmazonEKSClusterAutoscalerPolicy \
  --override-existing-serviceaccounts \
  --approve

部署Auto Scaler

6. 跑这个command以下载部署的yaml文件

curl -o cluster-autoscaler-autodiscover.yaml https://raw.githubusercontent.com/kubernetes/autoscaler/master/cluster-autoscaler/cloudprovider/aws/examples/cluster-autoscaler-autodiscover.yaml

7. 更改这个yaml文件把YOUR CLUSTER NAME改成你的集群名

8. 配置kubectl以访问EKS

aws eks --region api-southeast-1 update-kubeconfig --name YourClusterName

9. 使用kubectl 部署yaml文件

kubectl apply -f cluster-autoscaler-autodiscover.yaml

参考文档

https://docs.amazonaws.cn/eks/latest/userguide/cluster-autoscaler.html
https://www.youtube.com/watch?v=u0fTPemh9L0&t=1538s