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API and Resource Definitions

Machine

The Machine resource is defined by the cluster-api project. A Machine includes a providerSpec field which includes the data specific to this cluster-api provider.

BareMetalMachineProviderSpec

  • image -- This includes two sub-fields, url and checksum, which include the URL to the image and the URL to a checksum for that image. These fields are required. The image will be used for provisioning of the BareMetalHost chosen by the Machine actuator.

  • userData -- This includes two sub-fields, name and namespace, which reference a Secret that contains base64 encoded user-data to be written to a config drive on the provisioned BareMetalHost. This field is optional.

  • hostSelector -- Specify criteria for matching labels on BareMetalHost objects. This can be used to limit the set of available BareMetalHost objects chosen for this Machine.

Sample Machine

apiVersion: cluster.k8s.io/v1alpha1
kind: Machine
metadata:
  annotations:
    metal3.io/BareMetalHost: metal3/master-0
  creationTimestamp: "2019-05-13T13:00:51Z"
  finalizers:
  - machine.cluster.k8s.io
  generateName: baremetal-machine-
  generation: 2
  name: centos
  namespace: metal3
  resourceVersion: "1112"
  selfLink: /apis/cluster.k8s.io/v1alpha1/namespaces/metal3/machines/centos
  uid: 22acee54-757f-11e9-8091-280d3563c053
spec:
  metadata:
    creationTimestamp: null
  providerSpec:
    value:
      apiVersion: baremetal.cluster.k8s.io/v1alpha1
      image:
        checksum: http://172.22.0.1/images/CentOS-7-x86_64-GenericCloud-1901.qcow2.md5sum
        url: http://172.22.0.1/images/CentOS-7-x86_64-GenericCloud-1901.qcow2
      kind: BareMetalMachineProviderSpec
      userData:
        name: centos-user-data
        namespace: metal3
      hostSelector:
        matchLabels:
          key1: value1
        matchExpressions:
          key: key2
          operator: in
          values: {‘abc’, ‘123’, ‘value2’}
  versions:
    kubelet: ""

Sample userData Secret

apiVersion: v1
data:
  userData: BASE64_ENCODED_USER_DATA
kind: Secret
metadata:
  annotations:
  creationTimestamp: 2019-05-13T13:00:51Z
  name: centos-user-data
  namespace: metal3
  resourceVersion: "1108"
  selfLink: /api/v1/namespaces/metal3/secrets/centos-user-data
  uid: 22792b3e-757f-11e9-8091-280d3563c053
type: Opaque

hostSelector Examples

The `hostSelector field has two possible optional sub-fields:

  • matchLabels -- Key/value pairs of labels that must match exactly.

  • matchExpressions -- A set of expressions that must evaluate to true for the labels on a BareMetalHost.

Valid operators include:

  • ! -- Key does not exist. Values ignored.
  • = -- Key equals specified value. There must only be one value specified.
  • == -- Key equals specified value. There must only be one value specified.
  • in -- Value is a member of a set of possible values
  • != -- Key does not equal the specified value. There must only be one value specified.
  • notin -- Value not a member of the specified set of values.
  • exists -- Key exists. Values ignored.
  • gt -- Value is greater than the one specified. Value must be an integer.
  • lt -- Value is less than the one specified. Value must be an integer.

Example 1: Only consider a BareMetalHost with label key1 set to value1.

spec:
  providerSpec:
    value:
      hostSelector:
        matchLabels:
          key1: value1

Example 2: Only consider BareMetalHost with both key1 set to value1 AND key2 set to value2.

spec:
  providerSpec:
    value:
      hostSelector:
        matchLabels:
          key1: value1
          key2: value2

Example 3: Only consider BareMetalHost with key3 set to either a, b, or c.

spec:
  providerSpec:
    value:
      hostSelector:
        matchExpressions:
          - key: key3
            operator: in
            values: [‘a’, ‘b’, ‘c’]

Example 3: Only consider BareMetalHost with key1 set to value1 AND key2 set to value2 AND key3 set to either a, b, or c.

spec:
  providerSpec:
    value:
      hostSelector:
        matchLabels:
          key1: value1
          key2: value2
        matchExpressions:
          - key: key3
            operator: in
            values: [‘a’, ‘b’, ‘c’]