マネージドノードグループを利用している EKS で eksctl を利用して Amazon Linux2 から Amazon Linux 2023 に移行してみる
2025.05.31こんにちは。クラウド事業本部の枡川です。
Amazon Linux2 は 2026 年 6 月 30 日にサポート終了します。
Amazon Linux 2 のサポート終了日 (サポート終了、または EOL) は 2026 年 6 月 30 日です。
https://aws.amazon.com/jp/amazon-linux-2/faqs/
ただし、EKS のノードとして EKS 最適化 AMI を利用している場合は、もう少し早い 2025 年 11 月 26 日にサポート終了となります。
使い続ける分には構わないものの、セキュリティパッチやバグ修正は行われません。
AWS will end support for EKS AL2-optimized and AL2-accelerated AMIs, effective November 26, 2025. While you can continue using EKS AL2 AMIs after the end-of-support (EOS) date (November 26, 2025), EKS will no longer release any new Kubernetes versions or updates to AL2 AMIs, including minor releases, patches, and bug fixes after this date.
https://docs.aws.amazon.com/eks/latest/userguide/eks-ami-deprecation-faqs.html
また、EKS 1.33 以降は Amazon Linux2 ベースの EKS 最適化 AMI が提供されなくなります。
Additionally, Kubernetes version 1.32 is the last version for which Amazon EKS will release AL2 AMIs.
https://github.com/awslabs/amazon-eks-ami
カスタム AMI を作成する形で 2026 年 6 月 30 まで Amazon Linux2 を使い続けることはできますが、そこまでして半年程度延命しても得られるメリットが少ないため、実質的には 2025 年 11 月 26 日までに移行することになると思います。
移行先としては Amazon Linux2023 の他、Bottlerocket も考えられます。
We recommend upgrading to Amazon Linux 2023 (AL2023) or Bottlerocket AMIs:
AL2023 enables a secure-by-default approach with preconfigured security policies, SELinux in permissive mode, IMDSv2-only mode enabled by default, optimized boot times, and improved package management for enhanced security and performance, well-suited for infrastructure requiring significant customizations like direct OS-level access or extensive node changes.
Bottlerocket enables enhanced security, faster boot times, and a smaller attack surface for improved efficiency with its purpose-built, container-optimized design, well-suited for container-native approaches with minimal node customizations.
https://docs.aws.amazon.com/eks/latest/userguide/eks-ami-deprecation-faqs.html
移行による影響を少しでも抑えたい場合は Amazon Linux2023 が良いと思いますが、このタイミングで Bottlerocket に移行してしまうのも良いでしょう。
インストールされているコンポーネントが少ないため、アタックサーフェスの縮小によるセキュリティの向上や、運用コスト低減などのメリットを享受できます。
本ブログにおいては Amazon Linux2023 に移行してみます。
EKS クラスターを eksctl で作成する
まず、eksctl で Amazon Linux2 ベースの EKS 最適化 AMI を利用した EKS クラスターを作成します。
下記設定ファイルを利用します。
apiVersion: eksctl.io/v1alpha5
kind: ClusterConfig
metadata:
name: test-cluster
region: ap-northeast-1
version: "1.32"
iam:
withOIDC: true
vpc:
clusterEndpoints:
publicAccess: true
privateAccess: true
cloudWatch:
clusterLogging:
enableTypes:
- "audit"
- "authenticator"
- "controllerManager"
- "scheduler"
managedNodeGroups:
- name: node-group-al2
amiFamily: AmazonLinux2
instanceTypes:
- t3.medium
maxSize: 1
minSize: 1
desiredCapacity: 1
privateNetworking: true
volumeType: gp3
volumeSize: 50
autoModeConfig:
enabled: false
addons:
- name: eks-pod-identity-agent
version: latest
- name: vpc-cni
version: latest
useDefaultPodIdentityAssociations: true
- name: coredns
version: latest
- name: kube-proxy
version: latest
明示的に amiFamily を指定していますが、現時点 (v0.208.0) でのデフォルト値も AmazonLinux2 になります。
意図せず Amazon Linux2 を利用している場合は気づかぬ内にサポート終了していることがないよう、特に注意が必要です。
下記コマンドを実行して、クラスターを作成します。
% eksctl create cluster -f cluster.yaml
2025-05-31 13:13:55 [ℹ] eksctl version 0.208.0
2025-05-31 13:13:55 [ℹ] using region ap-northeast-1
2025-05-31 13:13:55 [!] Amazon EKS will no longer publish EKS-optimized Amazon Linux 2 (AL2) AMIs after November 26th, 2025. Additionally, Kubernetes version 1.32 is the last version for which Amazon EKS will release AL2 AMIs. From version 1.33 onwards, Amazon EKS will continue to release AL2023 and Bottlerocket based AMIs. The default AMI family when creating clusters and nodegroups in Eksctl will be changed to AL2023 in the future.
2025-05-31 13:13:55 [ℹ] setting availability zones to [ap-northeast-1c ap-northeast-1d ap-northeast-1a]
2025-05-31 13:13:55 [ℹ] subnets for ap-northeast-1c - public:192.168.0.0/19 private:192.168.96.0/19
2025-05-31 13:13:55 [ℹ] subnets for ap-northeast-1d - public:192.168.32.0/19 private:192.168.128.0/19
2025-05-31 13:13:55 [ℹ] subnets for ap-northeast-1a - public:192.168.64.0/19 private:192.168.160.0/19
2025-05-31 13:13:55 [ℹ] nodegroup "node-group-al2" will use "" [AmazonLinux2/1.32]
2025-05-31 13:13:55 [ℹ] using Kubernetes version 1.32
2025-05-31 13:13:55 [ℹ] creating EKS cluster "test-cluster" in "ap-northeast-1" region with managed nodes
2025-05-31 13:13:55 [ℹ] 1 nodegroup (node-group-al2) was included (based on the include/exclude rules)
2025-05-31 13:13:55 [ℹ] will create a CloudFormation stack for cluster itself and 1 managed nodegroup stack(s)
2025-05-31 13:13:55 [ℹ] if you encounter any issues, check CloudFormation console or try 'eksctl utils describe-stacks --region=ap-northeast-1 --cluster=test-cluster'
2025-05-31 13:13:55 [ℹ] Kubernetes API endpoint access will use provided values {publicAccess=true, privateAccess=true} for cluster "test-cluster" in "ap-northeast-1"
2025-05-31 13:13:55 [ℹ] configuring CloudWatch logging for cluster "test-cluster" in "ap-northeast-1" (enabled types: audit, authenticator, controllerManager, scheduler & disabled types: api)
2025-05-31 13:13:55 [ℹ] default addons metrics-server were not specified, will install them as EKS addons
2025-05-31 13:13:55 [ℹ]
2 sequential tasks: { create cluster control plane "test-cluster",
2 sequential sub-tasks: {
5 sequential sub-tasks: {
1 task: { create addons },
wait for control plane to become ready,
associate IAM OIDC provider,
no tasks,
update VPC CNI to use IRSA if required,
},
create managed nodegroup "node-group-al2",
}
}
2025-05-31 13:13:55 [ℹ] building cluster stack "eksctl-test-cluster-cluster"
2025-05-31 13:13:55 [ℹ] deploying stack "eksctl-test-cluster-cluster"
2025-05-31 13:14:25 [ℹ] waiting for CloudFormation stack "eksctl-test-cluster-cluster"
2025-05-31 13:14:55 [ℹ] waiting for CloudFormation stack "eksctl-test-cluster-cluster"
2025-05-31 13:15:55 [ℹ] waiting for CloudFormation stack "eksctl-test-cluster-cluster"
2025-05-31 13:16:56 [ℹ] waiting for CloudFormation stack "eksctl-test-cluster-cluster"
2025-05-31 13:17:56 [ℹ] waiting for CloudFormation stack "eksctl-test-cluster-cluster"
2025-05-31 13:18:57 [ℹ] waiting for CloudFormation stack "eksctl-test-cluster-cluster"
2025-05-31 13:19:57 [ℹ] waiting for CloudFormation stack "eksctl-test-cluster-cluster"
2025-05-31 13:20:57 [ℹ] waiting for CloudFormation stack "eksctl-test-cluster-cluster"
2025-05-31 13:21:57 [ℹ] waiting for CloudFormation stack "eksctl-test-cluster-cluster"
2025-05-31 13:22:57 [ℹ] waiting for CloudFormation stack "eksctl-test-cluster-cluster"
2025-05-31 13:23:58 [ℹ] waiting for CloudFormation stack "eksctl-test-cluster-cluster"
2025-05-31 13:23:59 [ℹ] creating addon: eks-pod-identity-agent
2025-05-31 13:24:00 [ℹ] successfully created addon: eks-pod-identity-agent
2025-05-31 13:24:00 [ℹ] "addonsConfig.autoApplyPodIdentityAssociations" is set to true; will lookup recommended pod identity configuration for "vpc-cni" addon
2025-05-31 13:24:01 [ℹ] deploying stack "eksctl-test-cluster-addon-vpc-cni-podidentityrole-aws-node"
2025-05-31 13:24:01 [ℹ] waiting for CloudFormation stack "eksctl-test-cluster-addon-vpc-cni-podidentityrole-aws-node"
2025-05-31 13:24:31 [ℹ] waiting for CloudFormation stack "eksctl-test-cluster-addon-vpc-cni-podidentityrole-aws-node"
2025-05-31 13:24:31 [ℹ] creating addon: vpc-cni
2025-05-31 13:24:33 [ℹ] successfully created addon: vpc-cni
2025-05-31 13:24:33 [ℹ] creating addon: coredns
2025-05-31 13:24:34 [ℹ] successfully created addon: coredns
2025-05-31 13:24:34 [ℹ] creating addon: kube-proxy
2025-05-31 13:24:35 [ℹ] successfully created addon: kube-proxy
2025-05-31 13:24:35 [ℹ] creating addon: metrics-server
2025-05-31 13:24:35 [ℹ] successfully created addon: metrics-server
2025-05-31 13:26:38 [ℹ] addon "vpc-cni" active
2025-05-31 13:26:39 [ℹ] updating IAM resources stack "eksctl-test-cluster-addon-vpc-cni-podidentityrole-aws-node" for pod identity association "a-sxfqrigqa8dp5wie8"
2025-05-31 13:26:40 [ℹ] waiting for CloudFormation changeset "eksctl--aws-node-update-1748665599" for stack "eksctl-test-cluster-addon-vpc-cni-podidentityrole-aws-node"
2025-05-31 13:26:40 [ℹ] nothing to update
2025-05-31 13:26:40 [ℹ] IAM resources for aws-node (pod identity association ID: a-sxfqrigqa8dp5wie8) are already up-to-date
2025-05-31 13:26:40 [ℹ] updating addon
2025-05-31 13:26:51 [ℹ] addon "vpc-cni" active
2025-05-31 13:26:51 [ℹ] building managed nodegroup stack "eksctl-test-cluster-nodegroup-node-group-al2"
2025-05-31 13:26:52 [ℹ] deploying stack "eksctl-test-cluster-nodegroup-node-group-al2"
2025-05-31 13:26:52 [ℹ] waiting for CloudFormation stack "eksctl-test-cluster-nodegroup-node-group-al2"
2025-05-31 13:27:22 [ℹ] waiting for CloudFormation stack "eksctl-test-cluster-nodegroup-node-group-al2"
2025-05-31 13:28:06 [ℹ] waiting for CloudFormation stack "eksctl-test-cluster-nodegroup-node-group-al2"
2025-05-31 13:29:08 [ℹ] waiting for CloudFormation stack "eksctl-test-cluster-nodegroup-node-group-al2"
2025-05-31 13:29:08 [ℹ] waiting for the control plane to become ready
2025-05-31 13:29:09 [✔] saved kubeconfig as "/Users/masukawa.kentaro/.kube/config"
2025-05-31 13:29:09 [ℹ] no tasks
2025-05-31 13:29:09 [✔] all EKS cluster resources for "test-cluster" have been created
2025-05-31 13:29:09 [ℹ] nodegroup "node-group-al2" has 1 node(s)
2025-05-31 13:29:09 [ℹ] node "ip-192-168-160-246.ap-northeast-1.compute.internal" is ready
2025-05-31 13:29:09 [ℹ] waiting for at least 1 node(s) to become ready in "node-group-al2"
2025-05-31 13:29:09 [ℹ] nodegroup "node-group-al2" has 1 node(s)
2025-05-31 13:29:09 [ℹ] node "ip-192-168-160-246.ap-northeast-1.compute.internal" is ready
2025-05-31 13:29:09 [✔] created 1 managed nodegroup(s) in cluster "test-cluster"
2025-05-31 13:29:10 [ℹ] kubectl command should work with "/Users/xxxxxx/.kube/config", try 'kubectl get nodes'
2025-05-31 13:29:10 [✔] EKS cluster "test-cluster" in "ap-northeast-1" region is ready
作成中にも Amazon EKS will no longer publish EKS-optimized Amazon Linux 2 (AL2) AMIs after November 26th, 2025. と警告がでています。
無事作成完了したので、Nginx の Deployment を作成しておきます。
apiVersion: apps/v1
kind: Deployment
metadata:
namespace: default
name: nginx
spec:
selector:
matchLabels:
app.kubernetes.io/name: nginx
replicas: 1
template:
metadata:
labels:
app.kubernetes.io/name: nginx
spec:
containers:
- image: nginx
imagePullPolicy: Always
name: nginx
ports:
- containerPort: 80
resources:
requests:
cpu: "0.5"
無事作成完了しました。
% kubectl apply -f nginx.yaml
deployment.apps/nginx created
この段階で、ノードグループは一つ存在します。
% eksctl get nodegroup --cluster test-cluster
CLUSTER NODEGROUP STATUS CREATED MIN SIZE MAX SIZE DESIRED CAPACITY INSTANCE TYPE IMAGE ID ASG NAME TYPE
test-cluster node-group-al2 ACTIVE 2025-05-31T04:27:18Z 1 1 1t3.medium AL2_x86_64 eks-node-group-al2-08cb924c-0837-7482-4c94-1c3a8e6c144c managed
ノードも一つ存在します。
% kubectl get node
NAME STATUS ROLES AGE VERSION
ip-192-168-160-246.ap-northeast-1.compute.internal Ready <none> 5m27s v1.32.3-eks-473151a
Pod 一覧は下記のようになります。
% kubectl get pod -A
NAMESPACE NAME READY STATUS RESTARTS AGE
default nginx-7c64dfbfdc-7r6xg 1/1 Running 0 2m6s
kube-system aws-node-xwvd7 2/2 Running 0 6m49s
kube-system coredns-68b8b66bdb-7cchc 1/1 Running 0 9m3s
kube-system coredns-68b8b66bdb-rkrw5 1/1 Running 0 9m3s
kube-system eks-pod-identity-agent-2xq9q 1/1 Running 0 6m49s
kube-system kube-proxy-q7q29 1/1 Running 0 6m49s
kube-system metrics-server-6c8c76d545-9kcp5 1/1 Running 0 9m2s
kube-system metrics-server-6c8c76d545-kgnld 1/1 Running 0 9m2s
デプロイした Nginx と EKS アドオン関連の Pod が存在しています。
Amazon Linux2023 ベースの EKS 最適化 AMI に移行する
では、Amazon Linux2023 に移行します。
まず、eksctl 用の設定ファイルに新しいノードグループを追記します。
eksctl には、eksctl upgrade nodegroup と呼ばれるコマンドも存在し、Amazon Linux2 の中でリリースバージョンを更新する際はこちらを利用できます。
直近のリリース を確認して、--release-version オプションを指定しながらコマンドを実行することで更新できる形です。
eksctl upgrade nodegroup --name=node-group-al2 --cluster=test-cluster --release-version=1.32.3-20250519
ただし、今回の Amazon Linux 2 から Amazon Linux2023 は設定変更扱いになるので上記コマンドは利用できないようです。
そのため、下記のように node-group-al2023 を新しく追加しました。
apiVersion: eksctl.io/v1alpha5
kind: ClusterConfig
metadata:
name: test-cluster
region: ap-northeast-1
version: "1.32"
iam:
withOIDC: true
vpc:
clusterEndpoints:
publicAccess: true
privateAccess: true
cloudWatch:
clusterLogging:
enableTypes:
- "audit"
- "authenticator"
- "controllerManager"
- "scheduler"
managedNodeGroups:
- name: node-group-al2
amiFamily: AmazonLinux2
instanceTypes:
- t3.medium
maxSize: 1
minSize: 1
desiredCapacity: 1
privateNetworking: true
volumeType: gp3
volumeSize: 50
- name: node-group-al2023
amiFamily: AmazonLinux2023
instanceTypes:
- t3.medium
maxSize: 1
minSize: 1
desiredCapacity: 1
privateNetworking: true
volumeType: gp3
volumeSize: 50
autoModeConfig:
enabled: false
addons:
- name: eks-pod-identity-agent
version: latest
- name: vpc-cni
version: latest
useDefaultPodIdentityAssociations: true
- name: coredns
version: latest
- name: kube-proxy
version: latest
修正した設定ファイルを利用してノードグループを作成します。
% eksctl create nodegroup -f cluster.yaml
2025-05-31 13:45:50 [!] Amazon EKS will no longer publish EKS-optimized Amazon Linux 2 (AL2) AMIs after November 26th, 2025. Additionally, Kubernetes version 1.32 is the last version for which Amazon EKS will release AL2 AMIs. From version 1.33 onwards, Amazon EKS will continue to release AL2023 and Bottlerocket based AMIs. The default AMI family when creating clusters and nodegroups in Eksctl will be changed to AL2023 in the future.
2025-05-31 13:45:53 [ℹ] nodegroup "node-group-al2" will use "" [AmazonLinux2/1.32]
2025-05-31 13:45:53 [ℹ] nodegroup "node-group-al2023" will use "" [AmazonLinux2023/1.32]
2025-05-31 13:45:53 [ℹ] 1 existing nodegroup(s) (node-group-al2) will be excluded
2025-05-31 13:45:53 [ℹ] 1 nodegroup (node-group-al2023) was included (based on the include/exclude rules)
2025-05-31 13:45:53 [ℹ] will create a CloudFormation stack for each of 1 managed nodegroups in cluster "test-cluster"
2025-05-31 13:45:53 [ℹ]
2 sequential tasks: { fix cluster compatibility, 1 task: { 1 task: { create managed nodegroup "node-group-al2023" } }
}
2025-05-31 13:45:53 [ℹ] checking cluster stack for missing resources
2025-05-31 13:45:53 [ℹ] cluster stack has all required resources
2025-05-31 13:45:53 [ℹ] building managed nodegroup stack "eksctl-test-cluster-nodegroup-node-group-al2023"
2025-05-31 13:45:54 [ℹ] deploying stack "eksctl-test-cluster-nodegroup-node-group-al2023"
2025-05-31 13:45:54 [ℹ] waiting for CloudFormation stack "eksctl-test-cluster-nodegroup-node-group-al2023"
2025-05-31 13:46:24 [ℹ] waiting for CloudFormation stack "eksctl-test-cluster-nodegroup-node-group-al2023"
2025-05-31 13:47:23 [ℹ] waiting for CloudFormation stack "eksctl-test-cluster-nodegroup-node-group-al2023"
2025-05-31 13:48:00 [ℹ] waiting for CloudFormation stack "eksctl-test-cluster-nodegroup-node-group-al2023"
2025-05-31 13:49:26 [ℹ] waiting for CloudFormation stack "eksctl-test-cluster-nodegroup-node-group-al2023"
2025-05-31 13:49:26 [ℹ] no tasks
2025-05-31 13:49:26 [✔] created 0 nodegroup(s) in cluster "test-cluster"
2025-05-31 13:49:26 [ℹ] nodegroup "node-group-al2023" has 1 node(s)
2025-05-31 13:49:26 [ℹ] node "ip-192-168-163-109.ap-northeast-1.compute.internal" is ready
2025-05-31 13:49:26 [ℹ] waiting for at least 1 node(s) to become ready in "node-group-al2023"
2025-05-31 13:49:26 [ℹ] nodegroup "node-group-al2023" has 1 node(s)
2025-05-31 13:49:26 [ℹ] node "ip-192-168-163-109.ap-northeast-1.compute.internal" is ready
2025-05-31 13:49:26 [✔] created 1 managed nodegroup(s) in cluster "test-cluster"
2025-05-31 13:49:27 [ℹ] checking security group configuration for all nodegroups
2025-05-31 13:49:27 [ℹ] all nodegroups have up-to-date cloudformation templates
Amazon Linux2023 を利用したノードグループが作成されました。
% eksctl get nodegroup --cluster test-cluster
CLUSTER NODEGROUP STATUS CREATED MIN SIZE MAX SIZE DESIRED CAPACITY INSTANCE TYPE IMAGE ID ASG NAME TYPE
test-cluster node-group-al2 ACTIVE 2025-05-31T04:27:18Z 1 1 1t3.medium AL2_x86_64 eks-node-group-al2-08cb924c-0837-7482-4c94-1c3a8e6c144c managed
test-cluster node-group-al2023 ACTIVE 2025-05-31T04:46:20Z 1 1 1t3.medium AL2023_x86_64_STANDARD eks-node-group-al2023-decb9254-bec6-db67-fef2-f05903b6fdbd managed
それに伴い、ノードも作成されています。
% kubectl get node
NAME STATUS ROLES AGE VERSION
ip-192-168-160-246.ap-northeast-1.compute.internal Ready <none> 30m v1.32.3-eks-473151a
ip-192-168-163-109.ap-northeast-1.compute.internal Ready <none> 11m v1.32.3-eks-473151a
この段階で、Pod は基本的に古い方のノードに存在します。
Amazon VPC CNI と kube-proxy、Pod Identity Agent といった DaemonSet としてデプロイされたリソースのみ新しいノードにも配置されます。
% kubectl get pod -o wide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
nginx-7c64dfbfdc-7r6xg 1/1 Running 0 26m 192.168.167.212 ip-192-168-160-246.ap-northeast-1.compute.internal <none> <none>
masukawa.kentaro (arm64):~/development/test-env/eksctl
% kubectl get pod -o wide -A
NAMESPACE NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
default nginx-7c64dfbfdc-7r6xg 1/1 Running 0 26m 192.168.167.212 ip-192-168-160-246.ap-northeast-1.compute.internal <none> <none>
kube-system aws-node-q2bs4 2/2 Running 0 11m 192.168.163.109 ip-192-168-163-109.ap-northeast-1.compute.internal <none> <none>
kube-system aws-node-xwvd7 2/2 Running 0 31m 192.168.160.246 ip-192-168-160-246.ap-northeast-1.compute.internal <none> <none>
kube-system coredns-68b8b66bdb-7cchc 1/1 Running 0 33m 192.168.181.65 ip-192-168-160-246.ap-northeast-1.compute.internal <none> <none>
kube-system coredns-68b8b66bdb-rkrw5 1/1 Running 0 33m 192.168.170.170 ip-192-168-160-246.ap-northeast-1.compute.internal <none> <none>
kube-system eks-pod-identity-agent-2xq9q 1/1 Running 0 31m 192.168.160.246 ip-192-168-160-246.ap-northeast-1.compute.internal <none> <none>
kube-system eks-pod-identity-agent-m5485 1/1 Running 0 11m 192.168.163.109 ip-192-168-163-109.ap-northeast-1.compute.internal <none> <none>
kube-system kube-proxy-bn7ks 1/1 Running 0 11m 192.168.163.109 ip-192-168-163-109.ap-northeast-1.compute.internal <none> <none>
kube-system kube-proxy-q7q29 1/1 Running 0 31m 192.168.160.246 ip-192-168-160-246.ap-northeast-1.compute.internal <none> <none>
kube-system metrics-server-6c8c76d545-9kcp5 1/1 Running 0 33m 192.168.171.8 ip-192-168-160-246.ap-northeast-1.compute.internal <none> <none>
kube-system metrics-server-6c8c76d545-kgnld 1/1 Running 0 33m 192.168.179.34 ip-192-168-160-246.ap-northeast-1.compute.internal <none> <none>
古いノードグループを削除する前に、Pod を新しいノードに移行していきます。
まず、古いノードに新しく Pod が配置されないように cordon を実行します。
% kubectl cordon ip-192-168-160-246.ap-northeast-1.compute.internal
node/ip-192-168-160-246.ap-northeast-1.compute.internal cordoned
SchedulingDisabled と表示されていることを確認します。
% kubectl get node
NAME STATUS ROLES AGE VERSION
ip-192-168-160-246.ap-northeast-1.compute.internal Ready,SchedulingDisabled <none> 39m v1.32.3-eks-473151a
ip-192-168-163-109.ap-northeast-1.compute.internal Ready <none> 20m v1.32.3-eks-473151a
古いノードに対して drain を実行して、Pod を移行します。
今回は metrics-server が emptydir を持っているので、エラーがでました。
% kubectl drain ip-192-168-160-246.ap-northeast-1.compute.internal --ignore-daemonsets
node/ip-192-168-160-246.ap-northeast-1.compute.internal already cordoned
error: unable to drain node "ip-192-168-160-246.ap-northeast-1.compute.internal" due to error: cannot delete Pods with local storage (use --delete-emptydir-data to override): kube-system/metrics-server-6c8c76d545-9kcp5, kube-system/metrics-server-6c8c76d545-kgnld, continuing command...
There are pending nodes to be drained:
ip-192-168-160-246.ap-northeast-1.compute.internal
cannot delete Pods with local storage (use --delete-emptydir-data to override): kube-system/metrics-server-6c8c76d545-9kcp5, kube-system/metrics-server-6c8c76d545-kgnld
特に消えて困るデータが入っているわけではないので、--delete-emptydir-data オプションを付与して再実行します。
% kubectl drain ip-192-168-160-246.ap-northeast-1.compute.internal --ignore-daemonsets --delete-emptydir-data
node/ip-192-168-160-246.ap-northeast-1.compute.internal already cordoned
Warning: ignoring DaemonSet-managed Pods: kube-system/aws-node-xwvd7, kube-system/eks-pod-identity-agent-2xq9q, kube-system/kube-proxy-q7q29
evicting pod kube-system/metrics-server-6c8c76d545-kgnld
evicting pod kube-system/coredns-68b8b66bdb-7cchc
evicting pod kube-system/coredns-68b8b66bdb-rkrw5
evicting pod default/nginx-7c64dfbfdc-7r6xg
evicting pod kube-system/metrics-server-6c8c76d545-9kcp5
error when evicting pods/"coredns-68b8b66bdb-7cchc" -n "kube-system" (will retry after 5s): Cannot evict pod as it would violate the pod's disruption budget.
error when evicting pods/"metrics-server-6c8c76d545-kgnld" -n "kube-system" (will retry after 5s): Cannot evict pod as it would violate the pod's disruption budget.
pod/nginx-7c64dfbfdc-7r6xg evicted
pod/metrics-server-6c8c76d545-9kcp5 evicted
evicting pod kube-system/coredns-68b8b66bdb-7cchc
evicting pod kube-system/metrics-server-6c8c76d545-kgnld
error when evicting pods/"metrics-server-6c8c76d545-kgnld" -n "kube-system" (will retry after 5s): Cannot evict pod as it would violate the pod's disruption budget.
pod/coredns-68b8b66bdb-rkrw5 evicted
evicting pod kube-system/metrics-server-6c8c76d545-kgnld
error when evicting pods/"metrics-server-6c8c76d545-kgnld" -n "kube-system" (will retry after 5s): Cannot evict pod as it would violate the pod's disruption budget.
pod/coredns-68b8b66bdb-7cchc evicted
evicting pod kube-system/metrics-server-6c8c76d545-kgnld
error when evicting pods/"metrics-server-6c8c76d545-kgnld" -n "kube-system" (will retry after 5s): Cannot evict pod as it would violate the pod's disruption budget.
evicting pod kube-system/metrics-server-6c8c76d545-kgnld
error when evicting pods/"metrics-server-6c8c76d545-kgnld" -n "kube-system" (will retry after 5s): Cannot evict pod as it would violate the pod's disruption budget.
evicting pod kube-system/metrics-server-6c8c76d545-kgnld
error when evicting pods/"metrics-server-6c8c76d545-kgnld" -n "kube-system" (will retry after 5s): Cannot evict pod as it would violate the pod's disruption budget.
evicting pod kube-system/metrics-server-6c8c76d545-kgnld
pod/metrics-server-6c8c76d545-kgnld evicted
node/ip-192-168-160-246.ap-northeast-1.compute.internal drained
何度かエラーが出ていますが、Pod Disruption Budget を遵守しながら移行しているだけなので問題ありません。
コマンド実行後、DeamonsSet でデプロイされている Pod 以外は Amazon Linux2023 を利用したノードに移行していることを確認します。
% kubectl get pod -o wide -A
NAMESPACE NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
default nginx-7c64dfbfdc-cs9kd 1/1 Running 0 89s 192.168.169.4 ip-192-168-163-109.ap-northeast-1.compute.internal <none> <none>
kube-system aws-node-q2bs4 2/2 Running 0 23m 192.168.163.109 ip-192-168-163-109.ap-northeast-1.compute.internal <none> <none>
kube-system aws-node-xwvd7 2/2 Running 0 42m 192.168.160.246 ip-192-168-160-246.ap-northeast-1.compute.internal <none> <none>
kube-system coredns-68b8b66bdb-dc596 1/1 Running 0 89s 192.168.191.8 ip-192-168-163-109.ap-northeast-1.compute.internal <none> <none>
kube-system coredns-68b8b66bdb-jl4lp 1/1 Running 0 84s 192.168.173.6 ip-192-168-163-109.ap-northeast-1.compute.internal <none> <none>
kube-system eks-pod-identity-agent-2xq9q 1/1 Running 0 42m 192.168.160.246 ip-192-168-160-246.ap-northeast-1.compute.internal <none> <none>
kube-system eks-pod-identity-agent-m5485 1/1 Running 0 23m 192.168.163.109 ip-192-168-163-109.ap-northeast-1.compute.internal <none> <none>
kube-system kube-proxy-bn7ks 1/1 Running 0 23m 192.168.163.109 ip-192-168-163-109.ap-northeast-1.compute.internal <none> <none>
kube-system kube-proxy-q7q29 1/1 Running 0 42m 192.168.160.246 ip-192-168-160-246.ap-northeast-1.compute.internal <none> <none>
kube-system metrics-server-6c8c76d545-ds6nl 1/1 Running 0 89s 192.168.178.91 ip-192-168-163-109.ap-northeast-1.compute.internal <none> <none>
kube-system metrics-server-6c8c76d545-nmkch 1/1 Running 0 58s 192.168.184.155 ip-192-168-163-109.ap-northeast-1.compute.internal <none> <none>
DeamonsSet でデプロイされている Pod (AWS VPC CNI、kube-proxy、Pod Identity Agent など) は同じ役割のものが新しいノードにも存在するので、このまま削除してしまって問題ありません。
では古いノードグループを削除します。
--approve オプションを付けずに実行すると、どのノードグループが削除対象になるかを確認できます。
% eksctl delete nodegroup -f cluster.yaml --include=node-group-al2 --disable-eviction
2025-05-31 14:13:10 [ℹ] comparing 0 nodegroups defined in the given config ("cluster.yaml") against remote state
2025-05-31 14:13:10 [ℹ] combined include rules: node-group-al2
2025-05-31 14:13:10 [ℹ] 1 nodegroup (node-group-al2) was included (based on the include/exclude rules)
2025-05-31 14:13:10 [ℹ] (plan) would drain 1 nodegroup(s) in cluster "test-cluster"
2025-05-31 14:13:10 [ℹ] starting parallel draining, max in-flight of 1
2025-05-31 14:13:10 [ℹ] (plan) would delete 1 nodegroups from cluster "test-cluster"
2025-05-31 14:13:11 [ℹ] 1 task: { 1 task: { delete nodegroup "node-group-al2" [async] } }
2025-05-31 14:13:11 [✔] (plan) would have deleted 1 nodegroup(s) from cluster "test-cluster"
2025-05-31 14:13:11 [!] no changes were applied, run again with '--approve' to apply the changes
node-group-al2 が消えるのは想定通りなので、--approve オプションを付けて実行します。
本来このコマンド実行時に drain も実行してくれますが、DaemonSet を Eviction しようとしてエラーになったりと小回りが効かなかったので、事前に kubectl で実行する形にしています。
そのため、ここでは --disable-eviction オプションを付与しています。
% eksctl delete nodegroup -f cluster.yaml --include=node-group-al2 --disable-eviction --appro
ve
2025-05-31 14:13:40 [ℹ] comparing 0 nodegroups defined in the given config ("cluster.yaml") against remote state
2025-05-31 14:13:40 [ℹ] combined include rules: node-group-al2
2025-05-31 14:13:40 [ℹ] 1 nodegroup (node-group-al2) was included (based on the include/exclude rules)
2025-05-31 14:13:40 [ℹ] will drain 1 nodegroup(s) in cluster "test-cluster"
2025-05-31 14:13:40 [ℹ] starting parallel draining, max in-flight of 1
2025-05-31 14:13:40 [✔] drained all nodes: [ip-192-168-160-246.ap-northeast-1.compute.internal]
2025-05-31 14:13:40 [ℹ] will delete 1 nodegroups from cluster "test-cluster"
2025-05-31 14:13:40 [ℹ] 1 task: { 1 task: { delete nodegroup "node-group-al2" [async] } }
2025-05-31 14:13:40 [ℹ] will delete stack "eksctl-test-cluster-nodegroup-node-group-al2"
2025-05-31 14:13:40 [✔] deleted 1 nodegroup(s) from cluster "test-cluster"
AL2_x86_64 を利用しているノードグループが DELETING と表示されます。
% eksctl get nodegroup --cluster test-cluster
CLUSTER NODEGROUP STATUS CREATED MIN SIZE MAX SIZE DESIRED CAPACITY INSTANCE TYPE IMAGE ID ASG NAME TYPE
test-cluster node-group-al2 DELETING 2025-05-31T04:27:18Z 1 11 t3.medium AL2_x86_64 eks-node-group-al2-08cb924c-0837-7482-4c94-1c3a8e6c144c managed
test-cluster node-group-al2023 ACTIVE 2025-05-31T04:46:20Z 1 11 t3.medium AL2023_x86_64_STANDARD eks-node-group-al2023-decb9254-bec6-db67-fef2-f05903b6fdbd managed
しばらくすると完全に消えました！
% eksctl get nodegroup --cluster test-cluster
CLUSTER NODEGROUP STATUS CREATED MIN SIZE MAX SIZE DESIRED CAPACITY INSTANCE TYPE IMAGE ID ASG NAME TYPE
test-cluster node-group-al2023 ACTIVE 2025-05-31T04:46:20Z 1 1 1t3.medium AL2023_x86_64_STANDARD eks-node-group-al2023-decb9254-bec6-db67-fef2-f05903b6fdbd managed
設定ファイルからも該当する記述を削除して、最終的に下記のようになりました。
apiVersion: eksctl.io/v1alpha5
kind: ClusterConfig
metadata:
name: test-cluster
region: ap-northeast-1
version: "1.32"
iam:
withOIDC: true
vpc:
clusterEndpoints:
publicAccess: true
privateAccess: true
cloudWatch:
clusterLogging:
enableTypes:
- "audit"
- "authenticator"
- "controllerManager"
- "scheduler"
managedNodeGroups:
- name: node-group-al2023
amiFamily: AmazonLinux2023
instanceTypes:
- t3.medium
maxSize: 1
minSize: 1
desiredCapacity: 1
privateNetworking: true
volumeType: gp3
volumeSize: 50
autoModeConfig:
enabled: false
addons:
- name: eks-pod-identity-agent
version: latest
- name: vpc-cni
version: latest
useDefaultPodIdentityAssociations: true
- name: coredns
version: latest
- name: kube-proxy
version: latest
最後に
Amazon Linux2 のサポート終了日と Amazon Linux2 ベースの EKS 最適化 AMI でサポート終了日が異なるので、ご注意下さい。
今回はノードのみを移行しましたが、EKS 1.33 に上げる段階などで合わせて移行しても良いでしょう。
きちんと手順が整えられていれば、通常のプロセスの中で移行することも可能だと思います。
