minikubeを触る

K8Sって何？インストールしてみたけどUIすら開けない…って言うことでminikubeで色々触れたまでを書いた

# 環境
## VirtualBoxのubuntu20.10

```Vagrantfile
# -*- mode: ruby -*-
# vi: set ft=ruby :

# All Vagrant configuration is done below. The "2" in Vagrant.configure
# configures the configuration version (we support older styles for
# backwards compatibility). Please don't change it unless you know what
# you're doing.
Vagrant.configure("2") do |config|
  # The most common configuration options are documented and commented below.
  # For a complete reference, please see the online documentation at
  # https://docs.vagrantup.com.

  # Every Vagrant development environment requires a box. You can search for
  # boxes at https://vagrantcloud.com/search.
  config.vm.box = "bento/ubuntu-20.10"

  # Disable automatic box update checking. If you disable this, then
  # boxes will only be checked for updates when the user runs
  # `vagrant box outdated`. This is not recommended.
  # config.vm.box_check_update = false

  # Create a forwarded port mapping which allows access to a specific port
  # within the machine from a port on the host machine. In the example below,
  # accessing "localhost:8080" will access port 80 on the guest machine.
  # NOTE: This will enable public access to the opened port
  # config.vm.network "forwarded_port", guest: 80, host: 8080

  # Create a forwarded port mapping which allows access to a specific port
  # within the machine from a port on the host machine and only allow access
  # via 127.0.0.1 to disable public access
  # config.vm.network "forwarded_port", guest: 80, host: 8080, host_ip: "127.0.0.1"

  # Create a private network, which allows host-only access to the machine
  # using a specific IP.
  # config.vm.network "private_network", ip: "192.168.33.10"

  # Create a public network, which generally matched to bridged network.
  # Bridged networks make the machine appear as another physical device on
  # your network.
  # config.vm.network "public_network"
  config.vm.network"public_network", ip: "192.168.10.212", bridge: "Realtek PCIe GbE Family Controller"

  # Share an additional folder to the guest VM. The first argument is
  # the path on the host to the actual folder. The second argument is
  # the path on the guest to mount the folder. And the optional third
  # argument is a set of non-required options.
  # config.vm.synced_folder "../data", "/vagrant_data"

  # Provider-specific configuration so you can fine-tune various
  # backing providers for Vagrant. These expose provider-specific options.
  # Example for VirtualBox:
  #
  config.vm.provider "virtualbox" do |vb|
  #   # Display the VirtualBox GUI when booting the machine
  #   vb.gui = true
  #
  #   # Customize the amount of memory on the VM:
    vb.memory = "4096"
  end
  #
  # View the documentation for the provider you are using for more
  # information on available options.

  # Enable provisioning with a shell script. Additional provisioners such as
  # Ansible, Chef, Docker, Puppet and Salt are also available. Please see the
  # documentation for more information about their specific syntax and use.
  # config.vm.provision "shell", inline: <<-SHELL
  #   apt-get update
  #   apt-get install -y apache2
  # SHELL
end
```
---
# minikube環境構築
## dockerのインストール
[Install Docker Engine on Ubuntu](https://docs.docker.com/engine/install/ubuntu/)を参考に

```bash
sudo apt-get remove docker docker-engine docker.io containerd runc
sudo apt-get update
sudo apt-get install \
    apt-transport-https \
    ca-certificates \
    curl \
    gnupg \
    lsb-release
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo gpg --dearmor -o /usr/share/keyrings/docker-archive-keyring.gpg
echo \
  "deb [arch=amd64 signed-by=/usr/share/keyrings/docker-archive-keyring.gpg] https://download.docker.com/linux/ubuntu \
  $(lsb_release -cs) stable" | sudo tee /etc/apt/sources.list.d/docker.list > /dev/null
sudo apt-get update
sudo apt-get install docker-ce docker-ce-cli containerd.io
```

## minikubeのインストール
[minikube start](https://minikube.sigs.k8s.io/docs/start/)を参考に

```bash
curl -LO https://storage.googleapis.com/minikube/releases/latest/minikube_latest_amd64.deb
sudo dpkg -i minikube_latest_amd64.deb
```

---
# kubectlインストール
[Install and Set Up kubectl on Linux](https://kubernetes.io/docs/tasks/tools/install-kubectl-linux/)を参考に

```bash
sudo apt-get update
sudo apt-get install -y apt-transport-https ca-certificates curl
sudo curl -fsSLo /usr/share/keyrings/kubernetes-archive-keyring.gpg https://packages.cloud.google.com/apt/doc/apt-key.gpg
echo "deb [signed-by=/usr/share/keyrings/kubernetes-archive-keyring.gpg] https://apt.kubernetes.io/ kubernetes-xenial main" | sudo tee /etc/apt/sources.list.d/kubernetes.list
sudo apt-get update
sudo apt-get install -y kubectl
```

---
# ユーザー設定
rootではminikube startしたら

```
root@vagrant:~# minikube start
* minikube v1.18.1 on Ubuntu 20.10 (vbox/amd64)
* Using the docker driver based on user configuration
* The "docker" driver should not be used with root privileges.
* If you are running minikube within a VM, consider using --driver=none:
*   https://minikube.sigs.k8s.io/docs/reference/drivers/none/

X Exiting due to DRV_AS_ROOT: The "docker" driver should not be used with root privileges.
```

って怒られるので適当なユーザー(今回では`vagrant`)に対して`usermod -aG docker vagrant`をする

---
# minikube起動

```
# vagrantユーザーで
minikube config set driver docker
minikube start
```

---
# minikube停止

```
# vagrantユーザーで
minikube stop
```

---
# minikubeのWebUIに入る
* vagrantユーザーで`minikube dashboard`でダッシュボード起動`kubectl proxy --address=0.0.0.0 --accept-hosts='.*'`でプロクシ起動して外部から見れるようにする

```
vagrant@vagrant:~$ minikube dashboard
* Verifying dashboard health ...
* Launching proxy ...
* Verifying proxy health ...
* Opening http://127.0.0.1:36199/api/v1/namespaces/kubernetes-dashboard/services/http:kubernetes-dashboard:/proxy/ in your default browser...
  - http://127.0.0.1:36199/api/v1/namespaces/kubernetes-dashboard/services/http:kubernetes-dashboard:/proxy/
```
`http://127.0.0.1:36199/`を適切に変更する(うちの環境だと`http://192.168.10.212:8001/`)

---
# こんな画面が見れたら成功
![image.png](https://qiita-image-store.s3.ap-northeast-1.amazonaws.com/0/142784/27586d02-8913-994e-f20a-192d97c20de1.png)

---

これでやっと
[今さら聞けない人のためのK8s超入門 2021-3-5 A-8](https://www.youtube.com/watch?v=WQjsMcOphiw)を見てわかる…かも…