はじめに
Kubernetesをこれから取り組む方向けに、検証環境を用意してコンテナに慣れる為のメモ書きです。
構成としては、以下のようになります。
Docker Desktopの導入
以下からDecker Desktopをインストールします。
Docker Desktop: The #1 Containerization Tool for Developers | Docker
Kubernetes環境の構築
起動したDocker DesktopのKubernetesメニューから構築します。
まずは、有効化(Enable)。
初期画面は、以下のようになっています。
最新(1.37.0)はうまく構築できない。。。
なので1.36.4、2台のクラスター(Master1台 + Worker1台)で構築します。
完成！
コンテナの操作
操作は、コマンドプロンプトからkubectlコマンドを使います。
クラスターを構成するノードの確認
C:\>kubectl get nodes
NAME STATUS ROLES AGE VERSION
desktop-control-plane Ready control-plane 4m44s v1.36.4
desktop-worker Ready <none> 4m31s v1.36.4
起動しているPodの確認
C:\>kubectl get pods
No resources found in default namespace.
C:\>kubectl get pods -n kube-system
NAME READY STATUS RESTARTS AGE
coredns-589f44dc88-2ljm6 1/1 Running 0 5m19s
coredns-589f44dc88-ftm68 1/1 Running 0 5m19s
etcd-desktop-control-plane 1/1 Running 0 5m27s
kindnet-rmjf9 1/1 Running 0 5m16s
kindnet-t7q9p 1/1 Running 0 5m19s
kube-apiserver-desktop-control-plane 1/1 Running 0 5m25s
kube-controller-manager-desktop-control-plane 1/1 Running 0 5m28s
kube-proxy-6tnx6 1/1 Running 0 5m16s
kube-proxy-kd4mj 1/1 Running 0 5m19s
kube-scheduler-desktop-control-plane 1/1 Running 0 5m25s
試しにnginxのコンテナ(Pod)の起動
C:\>kubectl run nginx --image nginx:latest
pod/nginx created
起動したコンテナの確認
C:\>kubectl get pods
NAME READY STATUS RESTARTS AGE
nginx 0/1 ContainerCreating 0 6s
C:\>kubectl get pods -w
NAME READY STATUS RESTARTS AGE
nginx 1/1 Running 0 10s
C:\>kubectl get pods -o wide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
nginx 1/1 Running 0 2m30s 10.244.1.2 desktop-worker <none> <none>
C:\>kubectl describe pods nginx
Name: nginx
Namespace: default
Priority: 0
Service Account: default
Node: desktop-worker/172.18.0.2
Start Time: Fri, 18 Sep 2026 09:19:41 +0900
Labels: run=nginx
Annotations: <none>
Status: Running
IP: 10.244.1.2
IPs:
IP: 10.244.1.2
Containers:
nginx:
Container ID: containerd://8e7d797bebe1a03e265d1b9ca6eca8e1081891e349e6d787802d5ad5fe0910c5
Image: nginx:latest
Image ID: docker.io/library/nginx@sha256:d0d674272be3be36f9a13d79194fa0db5aa630ab3ede9bec459d12f67370aaef
Port: <none>
Host Port: <none>
State: Running
Started: Fri, 18 Sep 2026 09:19:50 +0900
Ready: True
Restart Count: 0
Environment: <none>
Mounts:
/var/run/secrets/kubernetes.io/serviceaccount from kube-api-access-dw8zw (ro)
Conditions:
Type Status
PodReadyToStartContainers True
Initialized True
Ready True
ContainersReady True
PodScheduled True
Volumes:
kube-api-access-dw8zw:
Type: Projected (a volume that contains injected data from multiple sources)
TokenExpirationSeconds: 3607
ConfigMapName: kube-root-ca.crt
Optional: false
DownwardAPI: true
QoS Class: BestEffort
Node-Selectors: <none>
Tolerations: node.kubernetes.io/not-ready:NoExecute op=Exists for 300s
node.kubernetes.io/unreachable:NoExecute op=Exists for 300s
Events:
Type Reason Age From Message
---- ------ ---- ---- -------
Normal Scheduled 3m52s default-scheduler Successfully assigned default/nginx to desktop-worker
Normal Pulling 3m51s kubelet spec.containers{nginx}: Pulling image "nginx:latest"
Normal Pulled 3m43s kubelet spec.containers{nginx}: Successfully pulled image "nginx:latest" in 8.317s (8.317s including waiting). Image size: 66343686 bytes.
Normal Created 3m43s kubelet spec.containers{nginx}: Container created
Normal Started 3m43s kubelet spec.containers{nginx}: Container started
コンテナの削除
C:\>kubectl delete pod nginx
pod "nginx" deleted from default namespace
続いて、Deployment(Podに自動復旧機能など追加された動作をする)。
C:\>kubectl create deployment web-app --image=nginx
deployment.apps/web-app created
C:\>kubectl get deployments
NAME READY UP-TO-DATE AVAILABLE AGE
web-app 1/1 1 1 7s
C:\>kubectl get pods
NAME READY STATUS RESTARTS AGE
web-app-785556bfbd-7k75d 1/1 Running 0 12s
Deploymentの外部公開
C:\>kubectl expose deployment web-app --type=NodePort --port=80
service/web-app exposed
C:\>kubectl get svc
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 35m
web-app NodePort 10.96.204.206 <none> 80:31154/TCP 2s
Docker Desktop上のコンテナにホストOSからアクセスするためのポート転送
※ctrl+cで終了
C:\>kubectl port-forward service/web-app 3080:80
Forwarding from 127.0.0.1:3080 -> 80
Forwarding from [::1]:3080 -> 8
C:\>kubectl port-forward service/web-app 3080:80
Forwarding from 127.0.0.1:3080 -> 80
Forwarding from [::1]:3080 -> 80
Handling connection for 3080
Handling connection for 3080
作成したServiceの削除
C:\>kubectl get svc
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 39m
web-app NodePort 10.96.204.206 <none> 80:31154/TCP 3m57s
C:\>kubectl delete svc web-app
service "web-app" deleted from default namespace
作成したdeploymentの削除
C:\>kubectl get deployment
NAME READY UP-TO-DATE AVAILABLE AGE
web-app 1/1 1 1 22m
C:\>kubectl delete deployment web-app
deployment.apps "web-app" deleted from default namespace
Docker Desktop上のkubernetes環境の無効化
