cloud init script with kubernetes, helm, kubectl

cloud-init.yaml

#cloud-config
package_update: true
packages:
  - bash-completion
  - make
  - g++
  - jq
write_files:
  - path: /root/setup.sh
    permissions: '0755'
    content: |
      #!/bin/bash
      set -e

      ARCH=$(dpkg --print-architecture)

      # Install yq
      wget https://github.com/mikefarah/yq/releases/download/v4.2.0/yq_linux_amd64.tar.gz -O - | tar xz && mv yq_linux_amd64 /usr/bin/yq

      # Install kubectl
      wget -q "https://dl.k8s.io/release/$(curl -L -s https://dl.k8s.io/release/stable.txt)/bin/linux/${ARCH}/kubectl"
      install -o root -g root -m 0755 kubectl /usr/local/bin/kubectl
      rm kubectl

      # Enable bash completion for kubectl
      echo "source /usr/share/bash-completion/bash_completion" >> /home/ubuntu/.bashrc
      echo "complete -F __start_kubectl k" >> /home/ubuntu/.bashrc
      echo "alias k=kubectl" >> /home/ubuntu/.bashrc

      # Upgrade k0s
      curl --proto '=https' --tlsv1.2 -sSf https://get.k0s.sh | sudo sh

      # Install kubernetes
      k0s config create > /root/k0s.yaml
      ## we will setup cilium cni
      sed -i 's/provider: kuberouter/provider: custom/' /root/k0s.yaml
      ## disable kubeproxy (maybe not needed but necessary for laaaarge cluster) for cilium handle routing with eBPF
      yq eval '.spec.network.kubeProxy.disabled = true' -i /root/k0s.yaml
      ## Install k8s
      k0s install controller --enable-worker --no-taints -c /root/k0s.yaml
      k0s start
      sleep 120
      mkdir -p /home/ubuntu/.kube/
      k0s kubeconfig admin > /home/ubuntu/.kube/config

      # Install Helm
      HELM_RELEASE=$(curl -L -s -H 'Accept: application/json' https://github.com/helm/helm/releases/latest | sed -e 's/.*"tag_name":"\([^"]*\)".*/\1/')
      tar -xvz -C /tmp/ -f <(wget -q -O - https://get.helm.sh/helm-${HELM_RELEASE}-linux-${ARCH}.tar.gz)
      install -o root -g root -m 0755 /tmp/linux-${ARCH}/helm /usr/local/bin/helm

      # Install Go
      #wget -q https://go.dev/dl/go1.24.2.linux-${ARCH}.tar.gz
      #tar -xvf go1.24.2.linux-${ARCH}.tar.gz
      #mv go /usr/local
      #echo "export GOROOT=/usr/local/go" >> /etc/bash.bashrc
      #echo "export PATH=\$GOPATH/bin:\$GOROOT/bin:\$PATH" >> /etc/bash.bashrc
      #ln -sf /usr/local/go/bin/go /bin/go

      # Install Docker
      #curl -fsSL get.docker.com -o get-docker.sh
      #sudo sh get-docker.sh
      #sudo systemctl start docker
      #sudo systemctl enable docker

      # Add ubuntu user to docker group
      #sudo usermod -aG docker ubuntu

runcmd:
  - [ bash, /root/setup.sh ]