hooks definition for kubectl drain service in kops

kops1.yml

hooks:
  - execContainer:
      command:
      - sh
      - -c
      - chroot /rootfs curl -LsO https://storage.googleapis.com/kubernetes-release/release/v1.12.0/bin/linux/amd64/kubectl && chroot /rootfs install -m 755 kubectl /usr/local/bin/kubectl
      image: busybox
    roles:
    - Node
  - name: kubectl-drain.service
    roles:
    - Node
    useRawManifest: true
    manifest: |
        [Unit]
        Description=drain this k8s node to make running pods time to gracefully shut down before stopping kubelet
        After=kubelet.service
        [Service]
        Type=oneshot
        RemainAfterExit=true
        ExecStart=/bin/true
        TimeoutStopSec=120s
        ExecStop=/bin/sh -c "/usr/local/bin/kubectl drain --ignore-daemonsets=true --delete-local-data=true $$(hostname -f) --kubeconfig /var/lib/kubelet/kubeconfig"
        [Install]
        WantedBy=multi-user.target