#cloud-config

write_files:
  - path: /etc/systemd/system/containerd-installation.service
    permissions: 0644
    owner: root
    content: |
      # installed by cloud-init
      [Unit]
      Description=Download and install containerd binaries and configurations.
      After=network-online.target

      [Service]
      Type=oneshot
      RemainAfterExit=yes
      ExecStartPre=/bin/mkdir -p /home/containerd
      ExecStartPre=/bin/mount --bind /home/containerd /home/containerd
      ExecStartPre=/bin/mount -o remount,exec /home/containerd
      ExecStartPre=/usr/bin/curl --fail --retry 5 --retry-delay 3 --silent --show-error -H "X-Google-Metadata-Request: True" -o /home/containerd/configure.sh http://metadata.google.internal/computeMetadata/v1/instance/attributes/containerd-configure-sh
      ExecStartPre=/bin/chmod 544 /home/containerd/configure.sh
      ExecStart=/home/containerd/configure.sh

      [Install]
      WantedBy=containerd.target

  - path: /etc/systemd/system/containerd.service
    permissions: 0644
    owner: root
    content: |
      # installed by cloud-init
      [Unit]
      Description=containerd container runtime
      Documentation=https://containerd.io
      After=containerd-installation.service

      [Service]
      Restart=always
      RestartSec=5
      Delegate=yes
      KillMode=process
      OOMScoreAdjust=-999
      LimitNOFILE=1048576
      # Having non-zero Limit*s causes performance problems due to accounting overhead
      # in the kernel. We recommend using cgroups to do container-local accounting.
      LimitNPROC=infinity
      LimitCORE=infinity
      TasksMax=infinity
      ExecStartPre=/sbin/modprobe overlay
      ExecStart=/home/containerd/usr/local/bin/containerd

      [Install]
      WantedBy=containerd.target

  - path: /etc/systemd/system/containerd.target
    permissions: 0644
    owner: root
    content: |
      [Unit]
      Description=Containerd

      [Install]
      WantedBy=multi-user.target

runcmd:
  # Stop the existing containerd service if there is one. (for Docker 18.09+)
  - systemctl is-active containerd && systemctl stop containerd
  - systemctl daemon-reload
  - systemctl enable containerd-installation.service
  - systemctl enable containerd.service
  - systemctl enable containerd.target
  - systemctl start containerd.target
  # Start docker after containerd is running. (for Docker 18.09+)
  - systemctl is-active docker || systemctl start docker
