WSL2のUbuntuにk8sをインストールする際のスクリプト。 .bashrc から呼ぼう。

install_k8s.sh

#!/bin/bash

# Docker インストール
type -f docker > /dev/null && {
    docker -v
} || {
    (
        echo "[info] 'docker' is not found. start install..."
        sudo apt-get update
        sudo apt install -y docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin
        sudo systemctl enable docker
        sudo systemctl start docker
    ) && {
        echo "[info] 'docker' is installed."
    } || {
        echo "[err]  failed to install docker" >&2
        return 1
    }
}

cat /etc/group | grep docker | grep $USER > /dev/null || {
    echo "[info] add user to docker-group"
    sudo usermod -aG docker $USER
}

type -t docker-compose > /dev/null || {
    alias docker-compose='docker compose'
}

# kind(k8sを動かすための土台) インストール
type -t kind > /dev/null && {
    kind version
} || {
    (
        kind_version=$(curl -Ls https://github.com/kubernetes-sigs/kind/tags \
            | grep "kind/releases/tag" \
            | sed -e 's/^.*>v/v/' -e 's/<.*//g' \
            | sed '/^\s*$/d' \
            | grep -v alpha \
            | head -n 1)
        echo "[info] install 'kind(${kind_version})'"
        cd /tmp
        # For AMD64 / x86_64
        [ $(uname -m) = x86_64 ] && curl -Lo ./kind https://kind.sigs.k8s.io/dl/${kind_version}/kind-linux-amd64
        # For ARM64
        [ $(uname -m) = aarch64 ] && curl -Lo ./kind https://kind.sigs.k8s.io/dl/${kind_version}/kind-linux-arm64
        chmod +x ./kind
        sudo mv ./kind /usr/local/bin/kind
        echo "[info] 'kind(${kind_version})' is insatalled"
    ) || {
        echo "[err]  failed to install kind(${kind_version})" >&2
        return 1
    }
}

[[ "$(kind get clusters 2>/dev/null | wc -c)" -ne 0 ]] || kind create cluster

# k8s インストール
type -t kubectl > /dev/null && {
    kubectl version
} || (
    {
        k8s_version="$(curl -L -s https://dl.k8s.io/release/stable.txt)"
        echo "[info] install k8s(${k8s_version})"
        cd /tmp
        curl -LO "https://dl.k8s.io/release/${k8s_version}/bin/linux/amd64/kubectl"
        sudo install -o root -g root -m 0755 kubectl /usr/local/bin/kubectl
    } && {
        echo "[info] k8s(${k8s_version}) is insatalled"
    } || {
        echo "[err]  failed to install k8s(${k8s_version})" >&2
        return 1
    }
)

# k9s(k8sの各情報をGUIで見られるようにする) インストール
type -t k9s > /dev/null || (
    {
        echo "[info] install k9s"
        brew install derailed/k9s/k9s
        k9s_version="$(k9s version --short | head -n 1 | awk '{print $2}')"
    } && {
        echo "[info] k9s(${k9s_version}) is installed"
    } || {
        echo "[err] failed to install k9s" >&2
    }
)