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那些文件沒告訴你的 AWS EKS系列 第 7 篇

[07] 為什麼 CDK 部署 EKS cluster 會比較慢

14th鐵人賽 eks kubernetes cdk
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本日來探究一下 EKS 周邊部署 Cluster 方式，本系列文章主要以 eksctl 命令進行部署，以下為建立 cluster 時的輸出：

$ eksctl create cluster -f ./ironman-2022.yaml                                                                                                                                                                 
2022-09-14 09:39:32 [ℹ]  eksctl version 0.111.0
2022-09-14 09:39:32 [ℹ]  using region eu-west-1
2022-09-14 09:39:32 [ℹ]  setting availability zones to [eu-west-1a eu-west-1c eu-west-1b]
2022-09-14 09:39:32 [ℹ]  subnets for eu-west-1a - public:192.168.0.0/19 private:192.168.96.0/19
2022-09-14 09:39:32 [ℹ]  subnets for eu-west-1c - public:192.168.32.0/19 private:192.168.128.0/19
2022-09-14 09:39:32 [ℹ]  subnets for eu-west-1b - public:192.168.64.0/19 private:192.168.160.0/19
2022-09-14 09:39:32 [ℹ]  nodegroup "ng1-public-ssh" will use "" [AmazonLinux2/1.22]
2022-09-14 09:39:32 [ℹ]  using EC2 key pair "ironman-2022"
2022-09-14 09:39:32 [ℹ]  using Kubernetes version 1.22
2022-09-14 09:39:32 [ℹ]  creating EKS cluster "ironman-2022" in "eu-west-1" region with managed nodes
2022-09-14 09:39:32 [ℹ]  1 nodegroup (ng1-public-ssh) was included (based on the include/exclude rules)
2022-09-14 09:39:32 [ℹ]  will create a CloudFormation stack for cluster itself and 0 nodegroup stack(s)
2022-09-14 09:39:32 [ℹ]  will create a CloudFormation stack for cluster itself and 1 managed nodegroup stack(s)
2022-09-14 09:39:32 [ℹ]  if you encounter any issues, check CloudFormation console or try 'eksctl utils describe-stacks --region=eu-west-1 --cluster=ironman-2022'
2022-09-14 09:39:32 [ℹ]  Kubernetes API endpoint access will use default of {publicAccess=true, privateAccess=false} for cluster "ironman-2022" in "eu-west-1"
2022-09-14 09:39:32 [ℹ]  configuring CloudWatch logging for cluster "ironman-2022" in "eu-west-1" (enabled types: api, audit, authenticator, controllerManager, scheduler & no types disabled)
2022-09-14 09:39:32 [ℹ]
2 sequential tasks: { create cluster control plane "ironman-2022",
    2 sequential sub-tasks: {
        4 sequential sub-tasks: {
            wait for control plane to become ready,
            associate IAM OIDC provider,
            2 sequential sub-tasks: {
                create IAM role for serviceaccount "kube-system/aws-node",
                create serviceaccount "kube-system/aws-node",
            },
            restart daemonset "kube-system/aws-node",
        },
        create managed nodegroup "ng1-public-ssh",
    }
}
2022-09-14 09:39:32 [ℹ]  building cluster stack "eksctl-ironman-2022-cluster"
2022-09-14 09:39:33 [ℹ]  deploying stack "eksctl-ironman-2022-cluster"
2022-09-14 09:40:03 [ℹ]  waiting for CloudFormation stack "eksctl-ironman-2022-cluster"
2022-09-14 09:40:33 [ℹ]  waiting for CloudFormation stack "eksctl-ironman-2022-cluster"
2022-09-14 09:41:33 [ℹ]  waiting for CloudFormation stack "eksctl-ironman-2022-cluster"
2022-09-14 09:42:33 [ℹ]  waiting for CloudFormation stack "eksctl-ironman-2022-cluster"
2022-09-14 09:43:33 [ℹ]  waiting for CloudFormation stack "eksctl-ironman-2022-cluster"
2022-09-14 09:44:33 [ℹ]  waiting for CloudFormation stack "eksctl-ironman-2022-cluster"
2022-09-14 09:45:33 [ℹ]  waiting for CloudFormation stack "eksctl-ironman-2022-cluster"
2022-09-14 09:46:33 [ℹ]  waiting for CloudFormation stack "eksctl-ironman-2022-cluster"
2022-09-14 09:47:33 [ℹ]  waiting for CloudFormation stack "eksctl-ironman-2022-cluster"
2022-09-14 09:48:33 [ℹ]  waiting for CloudFormation stack "eksctl-ironman-2022-cluster"
2022-09-14 09:49:33 [ℹ]  waiting for CloudFormation stack "eksctl-ironman-2022-cluster"
2022-09-14 09:50:33 [ℹ]  waiting for CloudFormation stack "eksctl-ironman-2022-cluster"
2022-09-14 09:51:33 [ℹ]  waiting for CloudFormation stack "eksctl-ironman-2022-cluster"
2022-09-14 09:53:34 [ℹ]  building iamserviceaccount stack "eksctl-ironman-2022-addon-iamserviceaccount-kube-system-aws-node"
2022-09-14 09:53:35 [ℹ]  deploying stack "eksctl-ironman-2022-addon-iamserviceaccount-kube-system-aws-node"
2022-09-14 09:53:35 [ℹ]  waiting for CloudFormation stack "eksctl-ironman-2022-addon-iamserviceaccount-kube-system-aws-node"
2022-09-14 09:54:05 [ℹ]  waiting for CloudFormation stack "eksctl-ironman-2022-addon-iamserviceaccount-kube-system-aws-node"
2022-09-14 09:54:05 [ℹ]  serviceaccount "kube-system/aws-node" already exists
2022-09-14 09:54:05 [ℹ]  updated serviceaccount "kube-system/aws-node"
2022-09-14 09:54:05 [ℹ]  daemonset "kube-system/aws-node" restarted
2022-09-14 09:54:05 [ℹ]  building managed nodegroup stack "eksctl-ironman-2022-nodegroup-ng1-public-ssh"
2022-09-14 09:54:05 [ℹ]  deploying stack "eksctl-ironman-2022-nodegroup-ng1-public-ssh"
2022-09-14 09:54:05 [ℹ]  waiting for CloudFormation stack "eksctl-ironman-2022-nodegroup-ng1-public-ssh"
2022-09-14 09:54:35 [ℹ]  waiting for CloudFormation stack "eksctl-ironman-2022-nodegroup-ng1-public-ssh"
2022-09-14 09:55:18 [ℹ]  waiting for CloudFormation stack "eksctl-ironman-2022-nodegroup-ng1-public-ssh"
2022-09-14 09:56:04 [ℹ]  waiting for CloudFormation stack "eksctl-ironman-2022-nodegroup-ng1-public-ssh"
2022-09-14 09:57:24 [ℹ]  waiting for CloudFormation stack "eksctl-ironman-2022-nodegroup-ng1-public-ssh"
2022-09-14 09:59:10 [ℹ]  waiting for CloudFormation stack "eksctl-ironman-2022-nodegroup-ng1-public-ssh"
2022-09-14 09:59:10 [ℹ]  waiting for the control plane availability...
2022-09-14 09:59:12 [✔]  saved kubeconfig as "/home/ec2-user/.kube/config"
2022-09-14 09:59:12 [ℹ]  no tasks
2022-09-14 09:59:12 [✔]  all EKS cluster resources for "ironman-2022" have been created
2022-09-14 09:59:12 [ℹ]  nodegroup "ng1-public-ssh" has 2 node(s)
2022-09-14 09:59:12 [ℹ]  node "ip-192-168-29-179.eu-west-1.compute.internal" is ready
2022-09-14 09:59:12 [ℹ]  node "ip-192-168-78-165.eu-west-1.compute.internal" is ready
2022-09-14 09:59:12 [ℹ]  waiting for at least 2 node(s) to become ready in "ng1-public-ssh"

比對確認 EKS cluster 完成建立相關資源，扣除建立 nodegroup 資源之外，大致花費時間約 20 分鐘左右。

2022-09-14 09:39:32 [ℹ]  eksctl version 0.111.0
... 建立集群、ServiceAccount role
2022-09-14 09:59:12 [✔]  all EKS cluster resources for "ironman-2022" have been created
... 開始建立 nodegroup 資源

除了 eksctl 之外，我們也可以透過 CDK[1] 方式來 provision EKS cluster 資源，其 CDK 也屬於 Infrastructure as Code（IaC）[2] 一種工具，可以更加方便使用者透過撰寫程式碼方式建構 AWS 架構。

本文將探討為何 CDK 部署 EKS cluster 時會稍微花費較久一些時間。

透過 CDK 建置 EKS cluster

  1. 安裝 CDK，在驗證時安裝版本為 2.37.1。
$ npm i -g aws-cdk

$ cdk version
2.37.1 (build f15dee0)
  1. 初始化 project。
$ cdk init sample-app --language=typescript

Applying project template sample-app for typescript
# Welcome to your CDK TypeScript project

You should explore the contents of this project. It demonstrates a CDK app with an instance of a stack (`HelloEksStack`)
which contains an Amazon SQS queue that is subscribed to an Amazon SNS topic.

The `cdk.json` file tells the CDK Toolkit how to execute your app.

## Useful commands

* `npm run build`   compile typescript to js
* `npm run watch`   watch for changes and compile
* `npm run test`    perform the jest unit tests
* `cdk deploy`      deploy this stack to your default AWS account/region
* `cdk diff`        compare deployed stack with current state
* `cdk synth`       emits the synthesized CloudFormation template

Initializing a new git repository...
Executing npm install...
npm notice created a lockfile as package-lock.json. You should commit this file.
npm WARN hello-eks@0.1.0 No repository field.
npm WARN hello-eks@0.1.0 No license field.

✅ All done!
  1. 安裝相應套件並 bootstrap CDK。
$ npm i @aws-cdk/aws-ec2
$ npm i @aws-cdk/aws-eks


$ cdk bootstrap aws://111111111111/us-east-1
  1. 更新以下 CDK script 並建立 2 個 worker node。
$ cat ./bin/hello-eks.ts
#!/usr/bin/env node
import * as cdk from '@aws-cdk/core';
import { HelloEksStack } from '../lib/hello-eks-stack';

const app = new cdk.App();
const envIAD = { account: '111111111111', region: 'us-east-1' };

new HelloEksStack(app, 'HelloEksStack', { env: envIAD });

$ cat ./lib/hello-eks-stack.ts
import * as cdk from '@aws-cdk/core';
import * as eks from '@aws-cdk/aws-eks';
import * as ec2 from '@aws-cdk/aws-ec2';
import { Construct } from 'constructs';

export class HelloEksStack extends cdk.Stack {
  constructor(scope: cdk.Construct, id: string, props?: cdk.StackProps) {
    super(scope, id, props);

    const cluster = new eks.Cluster(this, 'HelloEKS', {
      version: eks.KubernetesVersion.V1_21,
      defaultCapacity: 2,
      defaultCapacityInstance: ec2.InstanceType.of(ec2.InstanceClass.T3, ec2.InstanceSize.MEDIUM),
    });

  }
}
  1. 部署 CDK stack，最終花費 1549.4s 約 25 分鐘。

$ cdk deploy

✨  Synthesis time: 3.83s

This deployment will make potentially sensitive changes according to your current security approval level (--require-approval broadening).
Please confirm you intend to make the following modifications:

...
... SKIP ... IAM Statement/Policy change
...
(NOTE: There may be security-related changes not in this list. See https://github.com/aws/aws-cdk/issues/1299)

Do you wish to deploy these changes (y/n)? y
HelloEksStack: deploying...
[0%] start: Publishing 4288ebb3652acdf2d828b7db7ca44a7162a401ace50ebb4026e84b18a02a06ee:current
[0%] start: Publishing 98908a88aa1d19a5175824f9f289b2d4736b7e17837f4e1ca871251a7505c02d:current
[0%] start: Publishing 3b263c2ad043fd069ef446753788c36e595c82b51a70478e58258c8ef7471671:current
[0%] start: Publishing 5a0165b80474734eff290897da1c8d571862f020eeaac2561c839386159c7f03:current
[0%] start: Publishing 2cbb4c8a663eb2c903e9cef3ad44c9b47d48b0a2cd35dfc270a23bf93b2ecf1f:current
[0%] start: Publishing c6964dbf0c556ec82ce09622e99ad6f6d4e488cdaac0ef9e8492e078ec61ffed:current
[0%] start: Publishing a174006e07995336de90bec7b82ca81a33082ac5e5e34af3d09563b0e9674824:current
[0%] start: Publishing 6fc1e809b207366e5c08060b7f9cd496ec5519c1018444e21de238bc0092b2bc:current
[12%] success: Published 5a0165b80474734eff290897da1c8d571862f020eeaac2561c839386159c7f03:current
[25%] success: Published 6fc1e809b207366e5c08060b7f9cd496ec5519c1018444e21de238bc0092b2bc:current
[37%] success: Published a174006e07995336de90bec7b82ca81a33082ac5e5e34af3d09563b0e9674824:current
[50%] success: Published 3b263c2ad043fd069ef446753788c36e595c82b51a70478e58258c8ef7471671:current
[62%] success: Published 98908a88aa1d19a5175824f9f289b2d4736b7e17837f4e1ca871251a7505c02d:current
[75%] success: Published 4288ebb3652acdf2d828b7db7ca44a7162a401ace50ebb4026e84b18a02a06ee:current
^[[O[87%] success: Published 2cbb4c8a663eb2c903e9cef3ad44c9b47d48b0a2cd35dfc270a23bf93b2ecf1f:current
^[[I[100%] success: Published c6964dbf0c556ec82ce09622e99ad6f6d4e488cdaac0ef9e8492e078ec61ffed:current
HelloEksStack: creating CloudFormation changeset...
[███████████████████████████████████████▍··················] (32/47)

 ✅  HelloEksStack

✨  Deployment time: 1549.4s

Outputs:
HelloEksStack.HelloEKSConfigCommand861347FC = aws eks update-kubeconfig --name HelloEKS39C624A1-91bdaaebbc8945038db74027028f56ec --region us-east-1 --role-arn arn:aws:iam::111111111111:role/HelloEksStack-HelloEKSMastersRole53742E60-1WJJ2WRTYBI91
HelloEksStack.HelloEKSGetTokenCommandF486E67D = aws eks get-token --cluster-name HelloEKS39C624A1-91bdaaebbc8945038db74027028f56ec --region us-east-1 --role-arn arn:aws:iam::111111111111:role/HelloEksStack-HelloEKSMastersRole53742E60-1WJJ2WRTYBI91
Stack ARN:
arn:aws:cloudformation:us-east-1:111111111111:stack/HelloEksStack/57dd8730-1974-11ed-96b8-12f38830ada9

✨  Total time: 1553.23s


NOTICES[[O

19836	AWS CDK v1 has entered maintenance mode

	Overview: AWS CDK v1 has entered maintenance mode on June 1, 2022.
	          Migrate to AWS CDK v2 to continue to get the latest features
	          and fixes!

	Affected versions: framework: 1.*, cli: 1.*

	More information at: https://github.com/aws/aws-cdk/issues/19836


If you don’t want to see a notice anymore, use "cdk acknowledge <id>". For example, "cdk acknowledge 19836".

分析

在檢視此 CloudFormation Stack 時，可以觀察到 CDK 會替我們部署以下 Lambda

  • AWS::Lambda::Function
  • AWS::Lambda::LayerVersion(KubectlLayer600207B5)

並比對 CloudFormation Event，可以確認 CDK 計算整體 CloudFormation 建置完成時間，其中包含上述 Lambda Function 流程。

2022-09-22T13:16:15.805Z 	AWS::CloudFormation::Stack	HelloEksStack-awscdkawseksKubectlProvide...
CREATE_COMPLETE

接續，為了解此 Lambda Function 主要處理目的，我們可以在 CDK @aws-cdk/aws-eks 了解其架構：

 +-----------------------------------------------+               +-----------------+
 |                 EKS Cluster                   |    kubectl    |                 |
 |-----------------------------------------------|<-------------+| Kubectl Handler |
 |                                               |               |                 |
 |                                               |               +-----------------+
 | +--------------------+    +-----------------+ |
 | |                    |    |                 | |
 | | Managed Node Group |    | Fargate Profile | |               +-----------------+
 | |                    |    |                 | |               |                 |
 | +--------------------+    +-----------------+ |               | Cluster Handler |
 |                                               |               |                 |
 +-----------------------------------------------+               +-----------------+
    ^                                   ^                          +
    |                                   |                          |
    | connect self managed capacity     |                          | aws-sdk
    |                                   | create/update/delete     |
    +                                   |                          v
 +--------------------+                 +              +-------------------+
 |                    |                 --------------+| eks.amazonaws.com |
 | Auto Scaling Group |                                +-------------------+
 |                    |
 +--------------------+

以下為兩個我們主要關注的 Lambda function：

  • KubectlHandler - 用於在 cluster 上調用 kubectl 命令的 Lambda function。
  • ClusterHandler - 用於與 EKS API 管理 cluster 生病週期的 Lambda function。

換言之，此 Lambda function 也會依據其定義等候 EKS 資源被建立後才能視為完成。故有可能在此 Lambda function 也會花費較多一些時間來設定 EKS cluster。此部分我們也可以在原始碼上觀察到類似定義：

export async function onEvent(event: AWSLambda.CloudFormationCustomResourceEvent) {
  const provider = createResourceHandler(event);
  return provider.onEvent();
}

export async function isComplete(event: AWSLambda.CloudFormationCustomResourceEvent): Promise<IsCompleteResponse> {
  const provider = createResourceHandler(event);
  return provider.isComplete();
}

function createResourceHandler(event: AWSLambda.CloudFormationCustomResourceEvent) {
  switch (event.ResourceType) {
    case consts.CLUSTER_RESOURCE_TYPE: return new ClusterResourceHandler(defaultEksClient, event);
    case consts.FARGATE_PROFILE_RESOURCE_TYPE: return new FargateProfileResourceHandler(defaultEksClient, event);
    default:
      throw new Error(`Unsupported resource type "${event.ResourceType}`);
  }
}

總結

由上述可以了解 CDK 相較於 eksctl額外定義兩個 Lambda function 來管理 EKS cluster，會稍微花費較多一些時間來進行部署及更新。

參考文件

  1. Getting started with the AWS CDK - https://docs.aws.amazon.com/cdk/v2/guide/getting_started.html
  2. Infrastructure as code - https://en.wikipedia.org/wiki/Infrastructure_as_code
  3. Architectural Overview - https://docs.aws.amazon.com/cdk/api/v1/docs/aws-eks-readme.html#architectural-overview
  4. https://github.com/aws/aws-cdk/blob/main/packages/%40aws-cdk/aws-eks/lib/cluster-resource-handler/index.ts#L49-L66

上一篇
[06] 為什麼 EKS cluster 可以讓 Pod 部署至 Fargate
下一篇
[08] 為什麼 EKS 可以整合 IAM roles for service accounts（IRSA）（一）
系列文
那些文件沒告訴你的 AWS EKS 共 30 篇
  1. 26
    [26] 為什麼 EKS 在更新 Kubernetes deployment 時會有 HTTP 502 的 error（一）
  2. 27
    [27] 為什麼 EKS 在更新 Kubernetes deployment 時會有 HTTP 502 的 error（二）
  3. 28
    [28] 為什麼 EKS 在更新 Kubernetes deployment 時會有 HTTP 502 的 error（三）
  4. 29
    [29] 為什麼 EKS 在更新 Kubernetes deployment 時會有 HTTP 502 的 error（四）
  5. 30
    [30] Summary
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