Minikubeをインストールした

Kubernetesやるぞ

今までKubernetesの勉強用にDocker for Desktopを使ってたけど,
なんか公式のチュートリアルがMinikubeを使ってるのでやっぱり入れてみた.

動作環境

masOS Mojave 10.14

やったこと

Minikubeのインストール
Kubernetesのセットアップ

Minikubeのインストール

Kubernetes公式の手順(Install Minikube)をやっていく.

まずはじめに仮想化が有効になっているかチェックする.
VMXの文字に色がついてたらOKらしい.

$ sysctl -a | grep -E --color 'machdep.cpu.features|VMX'
machdep.cpu.features: FPU VME DE PSE TSC MSR PAE MCE CX8 APIC SEP MTRR PGE MCA CMOV PAT PSE36 CLFSH DS ACPI MMX FXSR SSE SSE2 SS HTT TM PBE SSE3 PCLMULQDQ DTES64 MON DSCPL VMX SMX EST TM2 SSSE3 FMA CX16 TPR PDCM SSE4.1 SSE4.2 x2APIC MOVBE POPCNT AES PCID XSAVE OSXSAVE SEGLIM64 TSCTMR AVX1.0 RDRAND F16C

kubectlはDocker for Desktopをインストールしたときに一緒に入れてるので大丈夫なはず.
一応公式の手順はここ.

$ kubectl version
Client Version: version.Info{Major:"1", Minor:"14", GitVersion:"v1.14.6", GitCommit:"96fac5cd13a5dc064f7d9f4f23030a6aeface6cc", GitTreeState:"clean", BuildDate:"2019-08-19T11:13:49Z", GoVersion:"go1.12.9", Compiler:"gc", Platform:"darwin/amd64"}
Server Version: version.Info{Major:"1", Minor:"14", GitVersion:"v1.14.6", GitCommit:"96fac5cd13a5dc064f7d9f4f23030a6aeface6cc", GitTreeState:"clean", BuildDate:"2019-08-19T11:05:16Z", GoVersion:"go1.12.9", Compiler:"gc", Platform:"linux/amd64"}

また, VMのハイパーバイザーはDockerの旧Get StartedでVirtualBoxをインストール済み.
一応ここからダウンロードできる.

Homebrewを使ってMinikubeをインストールする.

$ brew cask install minikube
...
==> Tapping homebrew/cask
Cloning into '/usr/local/Homebrew/Library/Taps/homebrew/homebrew-cask'...
remote: Enumerating objects: 3601, done.
remote: Counting objects: 100% (3601/3601), done.
remote: Compressing objects: 100% (3593/3593), done.
remote: Total 3601 (delta 25), reused 576 (delta 6), pack-reused 0
Receiving objects: 100% (3601/3601), 1.20 MiB | 1.44 MiB/s, done.
Resolving deltas: 100% (25/25), done.
Tapped 1 command and 3489 casks (3,606 files, 3.9MB).
==> Satisfying dependencies
All Formula dependencies satisfied.
==> Downloading https://storage.googleapis.com/minikube/releases/v1.5.0/minikube-darwin-amd64
######################################################################## 100.0%
==> Verifying SHA-256 checksum for Cask 'minikube'.
==> Installing Cask minikube
==> Creating Caskroom at /usr/local/Caskroom
==> We'll set permissions properly so we won't need sudo in the future.
Password:
==> Linking Binary 'minikube-darwin-amd64' to '/usr/local/bin/minikube'.
🍺  minikube was successfully installed!

$ minikube version
minikube version: v1.5.0
commit: d1151d93385a70c5a03775e166e94067791fe2d9

早速Minikubeを起動する.

$ minikube start
😄  minikube v1.5.0 on Darwin 10.14
✨  Automatically selected the 'hyperkit' driver (alternates: [virtualbox])
💾  Downloading driver docker-machine-driver-hyperkit:
    > docker-machine-driver-hyperkit.sha256: 65 B / 65 B [---] 100.00% ? p/s 0s
    > docker-machine-driver-hyperkit: 10.79 MiB / 10.79 MiB  100.00% 3.25 MiB p
🔑  The 'hyperkit' driver requires elevated permissions. The following commands will be executed:

    $ sudo chown root:wheel /Users/uzimihsr/.minikube/bin/docker-machine-driver-hyperkit
    $ sudo chmod u+s /Users/uzimihsr/.minikube/bin/docker-machine-driver-hyperkit


Password:
💿  Downloading VM boot image ...
    > minikube-v1.5.0.iso.sha256: 65 B / 65 B [--------------] 100.00% ? p/s 0s
    > minikube-v1.5.0.iso: 143.77 MiB / 143.77 MiB [-] 100.00% 58.33 MiB p/s 2s
🔥  Creating hyperkit VM (CPUs=2, Memory=2000MB, Disk=20000MB) ...
🐳  Preparing Kubernetes v1.16.2 on Docker 18.09.9 ...
💾  Downloading kubeadm v1.16.2
💾  Downloading kubelet v1.16.2
🚜  Pulling images ...
🚀  Launching Kubernetes ...
⌛  Waiting for: apiserver proxy etcd scheduler controller dns
🏄  Done! kubectl is now configured to use "minikube"
⚠️  /usr/local/bin/kubectl is version 1.14.6, and is incompatible with Kubernetes 1.16.2. You will need to update /usr/local/bin/kubectl or use 'minikube kubectl' to connect with this cluster

ちゃんと起動したけどなんか勝手にHyperkitが使われちゃってるので一旦止める.

$ minikube delete
🔥  Deleting "minikube" in hyperkit ...
💔  The "minikube" cluster has been deleted.
🔥  Successfully deleted profile "minikube"

使用するハイパーバイザは--vm-driverフラグを指定すればいいらしい.

$ minikube start --vm-driver=virtualbox
😄  minikube v1.5.0 on Darwin 10.14
🔥  Creating virtualbox VM (CPUs=2, Memory=2000MB, Disk=20000MB) ...
🐳  Preparing Kubernetes v1.16.2 on Docker 18.09.9 ...
🚜  Pulling images ...
🚀  Launching Kubernetes ...
⌛  Waiting for: apiserver proxy etcd scheduler controller dns
🏄  Done! kubectl is now configured to use "minikube"
⚠️  /usr/local/bin/kubectl is version 1.14.6, and is incompatible with Kubernetes 1.16.2. You will need to update /usr/local/bin/kubectl or use 'minikube kubectl' to connect with this cluster

今度はちゃんとVirtualBoxを使ってくれた.
よく見たらkubectlのバージョンが古くて警告されてる. バージョンを上げない場合はminikube kubectlを使う必要があるみたい.

なんかログを見た感じmacBook上にVMを作成してそれをノードとしてKubernetesクラスタにしてるっぽい?
docker-machineを使ってSwarmクラスタを作ったときと似たことをやっている?
後で余裕があったらちゃんと調べておく(たぶんやらない).

とりあえずMinikubeのインストールは完了.

Kubernetesのセットアップ

Kubernetes公式の手順(Installing Kubernetes with Minikube)のQuickstartをやっていく.

minikube startは既に実行済みなので割愛.

早速kubectlでサンプル用Deploymentを作成してみる.

$ minikube kubectl create deployment hello-minikube --image=k8s.gcr.io/echoserver:1.10
Error: unknown flag: --image


Usage:
  minikube kubectl [flags] [options]

Use "minikube kubectl options" for a list of global command-line options (applies to all commands).

$ kubectl create deployment hello-minikube --image=k8s.gcr.io/echoserver:1.10
deployment.apps/hello-minikube created

$ kubectl get deployments
NAME             READY   UP-TO-DATE   AVAILABLE   AGE
hello-minikube   1/1     1            1           46s

さっきの警告どおりminikube kubectl使うと--imageが使えないぞ的なエラーになった. なぜ…?
まあ普通にkubectlが使えるのであまり気にしない.

この hello-minikube Deploymentの8080番ポートを公開するためのServiceを作成する.

$ kubectl expose deployment hello-minikube --type=NodePort --port=8080
service/hello-minikube exposed

hello-minikube のPodを確認する.

$ kubectl get pods
NAME                              READY   STATUS    RESTARTS   AGE
hello-minikube-797f975945-ftf9z   1/1     Running   0          6m38s

ServiceのURLを取得する.

$ minikube service hello-minikube --url
http://192.168.99.103:31394

取得したURLをブラウザで開く.
クラスタの詳細情報が表示される.

クラスタ詳細

動作確認ができたので, ServiceとDeploymentを削除する.

$ kubectl get all
NAME                                  READY   STATUS    RESTARTS   AGE
pod/hello-minikube-797f975945-ftf9z   1/1     Running   0          17m

NAME                     TYPE        CLUSTER-IP     EXTERNAL-IP   PORT(S)          AGE
service/hello-minikube   NodePort    10.109.38.18   <none>        8080:31394/TCP   13m
service/kubernetes       ClusterIP   10.96.0.1      <none>        443/TCP          29m

NAME                             READY   UP-TO-DATE   AVAILABLE   AGE
deployment.apps/hello-minikube   1/1     1            1           17m

NAME                                        DESIRED   CURRENT   READY   AGE
replicaset.apps/hello-minikube-797f975945   1         1         1       17m

$ kubectl delete service hello-minikube
service "hello-minikube" deleted

$ kubectl delete deployment hello-minikube
deployment.apps "hello-minikube" deleted

Minikubeクラスタを停止, 削除する.

$ minikube stop
✋  Stopping "minikube" in virtualbox ...
🛑  "minikube" stopped.

$ minikube delete
🔥  Deleting "minikube" in virtualbox ...
💔  The "minikube" cluster has been deleted.
🔥  Successfully deleted profile "minikube"

とりあえずMinikubeでKubernetesクラスタを構築してアプリをデプロイできた.

次はHello Minikubeあたりからチュートリアルを進めていく.

おまけ

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