heat_template_version: 2013-05-23

description: >
  This is a nested stack that defines a single Kubernetes minion,
  based on a vanilla Fedora 20 cloud image.  This stack is included by
  a ResourceGroup resource in the parent template (kubecluster-coreos.yaml).

parameters:

  server_image:
    type: string
    default: CoreOS
    description: glance image used to boot the server

  minion_flavor:
    type: string
    default: m1.small
    description: flavor to use when booting the server

  ssh_key_name:
    type: string
    description: name of ssh key to be provisioned on our server
    default: testkey

  external_network:
    type: string
    description: uuid/name of a network to use for floating ip addresses

  token:
    type: string
    description: token is generated from https://discovery.etcd.io/new

  ssh_authorized_key:
    type: string
    description: complete ssh key.

  kube_allow_priv:
    type: string
    description: >
      whether or not kubernetes should permit privileged containers.
    default: "false"
    constraints:
      - allowed_values: ["true", "false"]

  docker_volume_size:
    type: number
    description: >
      size of a cinder volume to allocate to docker for container/image
      storage
    default: 25

  # The following are all generated in the parent template.
  kube_master_ip:
    type: string
    description: IP address of the Kubernetes master server.
  fixed_network:
    type: string
    description: Network from which to allocate fixed addresses.
  fixed_subnet:
    type: string
    description: Subnet from which to allocate fixed addresses.

resources:

  minion_wait_handle:
    type: AWS::CloudFormation::WaitConditionHandle

  minion_wait_condition:
    type: AWS::CloudFormation::WaitCondition
    depends_on: kube-minion
    properties:
      Handle:
        get_resource: minion_wait_handle
      Timeout: 6000

  ######################################################################
  #
  # security groups.  we need to permit network traffic of various
  # sorts.
  #

  secgroup_all_open:
    type: OS::Neutron::SecurityGroup
    properties:
      rules:
        - protocol: icmp
        - protocol: tcp
        - protocol: udp

  ######################################################################
  #
  # software configs.  these are components that are combined into
  # a multipart MIME user-data archive.
  #

  write_heat_params:
    type: OS::Heat::SoftwareConfig
    properties:
      group: ungrouped
      config:
        str_replace:
          template: {get_file: fragments/write-heat-params.yaml}
          params:
            $KUBE_ALLOW_PRIV: {get_param: kube_allow_priv}
            $KUBE_MASTER_IP: {get_param: kube_master_ip}
            $WAIT_HANDLE: {get_resource: node_wait_handle}
            $DOCKER_VOLUME: {get_resource: docker_volume}

  coreos_params:
    type: OS::Heat::SoftwareConfig
    properties:
      group: ungrouped
      config:
        str_replace:
          template: {get_file: fragments/coreos.params.yaml}
          params:
            token: {get_param: token}
            ssh_authorized_key: {get_param: ssh_authorized_key}

  add_to_docker_group:
    type: OS::Heat::SoftwareConfig
    properties:
      group: ungrouped
      config: {get_file: fragments/add-to-docker-group.sh}

  configure_docker_storage:
    type: OS::Heat::SoftwareConfig
    properties:
      group: ungrouped
      config: {get_file: fragments/configure-docker-storage.sh}

  configure_kubernetes_minion:
    type: OS::Heat::SoftwareConfig
    properties:
      group: ungrouped
      config: {get_file: fragments/configure-kubernetes-minion.sh}

  kube_user:
    type: OS::Heat::SoftwareConfig
    properties:
      group: ungrouped
      config: {get_file: fragments/kube-user.yaml}

  kube_examples:
    type: OS::Heat::SoftwareConfig
    properties:
      group: ungrouped
      config: {get_file: fragments/kube-examples.yaml}

  docker_service:
    type: OS::Heat::SoftwareConfig
    properties:
      group: ungrouped
      config: {get_file: fragments/docker.service.yaml}

  enable_services:
    type: OS::Heat::SoftwareConfig
    properties:
      group: ungrouped
      config: {get_file: fragments/enable-services-minion.sh}

  cfn_signal:
    type: OS::Heat::SoftwareConfig
    properties:
      group: ungrouped
      config: {get_file: fragments/cfn-signal.sh}

  disable_selinux:
    type: OS::Heat::SoftwareConfig
    properties:
      group: ungrouped
      config: {get_file: fragments/disable-selinux.sh}

  kube_minion_init:
    type: OS::Heat::MultipartMime
    properties:
      parts:
        - config: {get_resource: disable_selinux}
        - config: {get_resource: write_heat_params}
        - config: {get_resource: kube_user}
        - config: {get_resource: kube_examples}
        - config: {get_resource: add_to_docker_group}
        - config: {get_resource: configure_docker_storage}
        - config: {get_resource: configure_kubernetes_minion}
        - config: {get_resource: docker_service}
        - config: {get_resource: enable_services}
        - config: {get_resource: cfn_signal}
        - config: {get_resource: coreos_params}

  # Important:  the name for the heat resource kube-minion below must
  # not contain "_" (underscore) because it will be used in the
  # hostname.  Because DNS domain name does not allow "_", the "_"
  # will be converted to a "-" and this will make the hostname different
  # from the Nova instance name.  This in turn will break the load
  # balancer feature in Kubernetes.

  kube-minion:
    type: OS::Nova::Server
    properties:
      image: {get_param: server_image}
      flavor: {get_param: minion_flavor}
      key_name: {get_param: ssh_key_name}
      user_data_format: RAW
      user_data: {get_resource: kube_minion_init}
      networks:
        - port: {get_resource: kube_minion_eth0}

  kube_minion_eth0:
    type: OS::Neutron::Port
    properties:
      network: {get_param: fixed_network}
      security_groups:
        - get_resource: secgroup_all_open
      fixed_ips:
        - subnet: {get_param: fixed_subnet}
      replacement_policy: AUTO

  kube_minion_floating:
    type: OS::Neutron::FloatingIP
    properties:
      floating_network: {get_param: external_network}
      port_id: {get_resource: kube_minion_eth0}

  docker_volume:
    type: OS::Cinder::Volume
    properties:
      size: {get_param: docker_volume_size}

  docker_volume_attach:
    type: OS::Cinder::VolumeAttachment
    properties:
      instance_uuid: {get_resource: kube-minion}
      volume_id: {get_resource: docker_volume}
      mountpoint: /dev/vdb

outputs:

  kube_minion_ip:
    value: {get_attr: [kube_minion_eth0, fixed_ips, 0, ip_address]}

  kube_minion_external_ip:
    value: {get_attr: [kube_minion_floating, floating_ip_address]}

  OS::stack_id:
    value: {get_attr: [kube_minion_eth0, fixed_ips, 0, ip_address]}