さくらのナレッジ minikube
さくらのナレッジをやってみるシリーズ。今回は minikube
簡単にローカルKubernetes環境を構築できるツール「Minikube」 https://knowledge.sakura.ad.jp/15320/
準備
- vurtualbox
- kubectl https://kubernetes.io/docs/tasks/tools/install-kubectl/#install-with-chocolatey-on-windows choco install kubernetes-cli
- minikube choco install minikube
- docker for windows
minikube はじめる
version 確認
> minikube version minikube version: v0.31.0
minikube start でクラスタ作成。なんかエラー出てるが、please enjoy minikube! だそうです。
> minikube start C:\Users\zun\.kube>minikube start Starting local Kubernetes v1.10.0 cluster... Starting VM... Downloading Minikube ISO 178.87 MB / 178.87 MB [============================================] 100.00% 0s Getting VM IP address... E1222 11:17:41.088917 11420 start.go:210] Error parsing version semver: Version string empty Moving files into cluster... Downloading kubeadm v1.10.0 Downloading kubelet v1.10.0 Finished Downloading kubelet v1.10.0 Finished Downloading kubeadm v1.10.0 Setting up certs... Connecting to cluster... Setting up kubeconfig... Stopping extra container runtimes... Starting cluster components... Verifying kubelet health ... Verifying apiserver health ...Kubectl is now configured to use the cluster. Loading cached images from config file. Everything looks great. Please enjoy minikube!
クラスタ確認。これは kubectl
> kubectl cluster-info Kubernetes master is running at https://192.168.99.100:8443 KubeDNS is running at https://192.168.99.100:8443/api/v1/namespaces/kube-system/services/kube-dns:dns/proxy To further debug and diagnose cluster problems, use 'kubectl cluster-info dump'.
> kubectl get node NAME STATUS ROLES AGE VERSION minikube Ready master 12m v1.10.0
kubectl cluster-info で表示された url を curl してみる。403 forbidden
> curl -k https://192.168.99.100:8443
{
"kind": "Status",
"apiVersion": "v1",
"metadata": {
},
"status": "Failure",
"message": "forbidden: User \"system:anonymous\" cannot get path \"/\"",
"reason": "Forbidden",
"details": {
},
"code": 403
}
こっちも 403 forbidden
> curl -k https://192.168.99.100:8443/api/v1/namespaces/kube-system/services/kube-dns:dns/proxy
{
"kind": "Status",
"apiVersion": "v1",
"metadata": {
},
"status": "Failure",
"message": "services \"kube-dns:dns\" is forbidden: User \"system:anonymous\" cannot get services/proxy in the namespace \"kube-system\"",
"reason": "Forbidden",
"details": {
"name": "kube-dns:dns",
"kind": "services"
},
"code": 403
}
kubectl cluster-info dump で大量の情報が得られるようだ。
}
kubectl cluster-info dump { "kind": "NodeList", "apiVersion": "v1", "metadata": { "selfLink": "/api/v1/nodes", "resourceVersion": "1367" }, : "items": [] } Cluster info dumped to standard output
> kubectl cluster-info dump
minikube dashboard でブラウザにダッシュボードが表示された
> minikube dashboard Opening http://127.0.0.1:52124/api/v1/namespaces/kube-system/services/http:kubernetes-dashboard:/proxy/ in your default browser...
kubectl get でいろいろみる
>kubectl get nodes NAME STATUS ROLES AGE VERSION minikube Ready master 3m v1.10.0 > kubectl get service NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 1m >kubectl get deploy No resources found. > kubectl get pod No resources found. > kubectl get namespace NAME STATUS AGE default Active 2m kube-public Active 2m kube-system Active 2m
minikube stop で virtualbox の vm:minikube が停止する
> minikube stop Stopping local Kubernetes cluster... Machine stopped.
minikube delete で virtualbox のお掃除。virtualbox の vm を直接削除した時もこれやれば大丈夫。
> minikube delete Deleting local Kubernetes cluster... Machine deleted.
クラスタ内のDockerにアクセスする
virtualbox と docker for windows といえば hyper-v 問題。ここはパスして次に進む。
Minikube環境内でコンテナを実行する
httpd.yml
apiVersion: v1
kind: Pod
metadata:
name: httpd
labels:
app: httpd
spec:
containers:
- name: httpd
image: httpd
ports:
- containerPort: 80
create 前
> kubectl get pod No resources found.
create
> kubectl create -f httpd.yml pod "httpd" created
create 後
> kubectl get pod NAME READY STATUS RESTARTS AGE httpd 1/1 Running 0 29s
Minikube環境内のコンテナにアクセスする
ここは自前yaml作ってみた。
httpd-deployment.yml
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
name: httpd-deployment
spec:
replicas: 2 # レプリカ数の指定
template: # Podのテンプレート(PodTemplate)
metadata:
labels: # ラベル指定は必須
app: httpd-deployment
spec:
containers:
- name: httpd
image: httpd
ports:
- containerPort: 80
create と delete を繰り返した。
kubectl create -f httpd-deployment.yml kubectl delete deployment httpd-deployment
httpd-service.yml
apiVersion: v1
kind: Service
metadata:
name: httpd-service
spec:
type: LoadBalancer
ports:
- port: 80
selector:
app: httpd-deployment
create と delete を繰り返した。
kubectl create -f httpd-service.yml kubectl delete service httpd-service
> kubectl get deployment NAME DESIRED CURRENT UP-TO-DATE AVAILABLE AGE httpd-deployment 2 2 2 2 16m > kubectl get service NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE httpd-service LoadBalancer 10.109.139.219 <pending> 80:31873/TCP 13m kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 1h
minikube で確認
minikube service httpd-service
こうなった
