implement Node affinity and NodeSelector

pkg/api/types.go

@@ -1043,6 +1043,93 @@ const (
 	DNSDefault DNSPolicy = "Default"
 )
 
+// A node selector represents the union of the results of one or more label queries
+// over a set of nodes; that is, it represents the OR of the selectors represented
+// by the node selector terms.
+type NodeSelector struct {
+	//Required. A list of node selector terms. The terms are ORed.
+	NodeSelectorTerms []NodeSelectorTerm `json:"nodeSelectorTerms"`
+}
+
+// A null or empty node selector term matches no objects.
+type NodeSelectorTerm struct {
+	//Required. A list of node selector requirements. The requirements are ANDed.
+	MatchExpressions []NodeSelectorRequirement `json:"matchExpressions"`
+}
+
+// A node selector requirement is a selector that contains values, a key, and an operator
+// that relates the key and values.
+type NodeSelectorRequirement struct {
+	// The label key that the selector applies to.
+	Key string `json:"key" patchStrategy:"merge" patchMergeKey:"key"`
+	// Represents a key's relationship to a set of values.
+	// Valid operators are In, NotIn, Exists, DoesNotExist. Gt, and Lt.
+	Operator NodeSelectorOperator `json:"operator"`
+	// An array of string values. If the operator is In or NotIn,
+	// the values array must be non-empty. If the operator is Exists or DoesNotExist,
+	// the values array must be empty. If the operator is Gt or Lt, the values
+	// array must have a single element, which will be interpreted as an integer.
+	// This array is replaced during a strategic merge patch.
+	Values []string `json:"values,omitempty"`
+}
+
+// A node selector operator is the set of operators that can be used in
+// a node selector requirement.
+type NodeSelectorOperator string
+
+const (
+	NodeSelectorOpIn           NodeSelectorOperator = "In"
+	NodeSelectorOpNotIn        NodeSelectorOperator = "NotIn"
+	NodeSelectorOpExists       NodeSelectorOperator = "Exists"
+	NodeSelectorOpDoesNotExist NodeSelectorOperator = "DoesNotExist"
+	NodeSelectorOpGt           NodeSelectorOperator = "Gt"
+	NodeSelectorOpLt           NodeSelectorOperator = "Lt"
+)
+
+// Affinity is a group of affinity scheduling requirements.
+type Affinity struct {
+	// Describes node affinity scheduling requirements for the pod.
+	NodeAffinity *NodeAffinity `json:"nodeAffinity,omitempty"`
+}
+
+// Node affinity is a group of node affinity scheduling requirements.
+// If RequiredDuringSchedulingRequiredDuringExecution and
+// RequiredDuringSchedulingIgnoredDuringExecution are both set,
+// then both node selectors must be satisfied.
+type NodeAffinity struct {
+	// If the affinity requirements specified by this field are not met at
+	// scheduling time, the pod will not be scheduled onto the node.
+	// If the affinity requirements specified by this field cease to be met
+	// at some point during pod execution (e.g. due to an update), the system
+	// will try to eventually evict the pod from its node.
+	RequiredDuringSchedulingRequiredDuringExecution *NodeSelector `json:"requiredDuringSchedulingRequiredDuringExecution,omitempty"`
+	// If the affinity requirements specified by this field are not met at
+	// scheduling time, the pod will not be scheduled onto the node.
+	// If the affinity requirements specified by this field cease to be met
+	// at some point during pod execution (e.g. due to an update), the system
+	// may or may not try to eventually evict the pod from its node.
+	RequiredDuringSchedulingIgnoredDuringExecution *NodeSelector `json:"requiredDuringSchedulingIgnoredDuringExecution,omitempty"`
+	// The scheduler will prefer to schedule pods to nodes that satisfy
+	// the affinity expressions specified by this field, but it may choose
+	// a node that violates one or more of the expressions. The node that is
+	// most preferred is the one with the greatest sum of weights, i.e.
+	// for each node that meets all of the scheduling requirements (resource
+	// request, requiredDuringScheduling affinity expressions, etc.),
+	// compute a sum by iterating through the elements of this field and adding
+	// "weight" to the sum if the node matches the corresponding matchExpressions; the
+	// node(s) with the highest sum are the most preferred.
+	PreferredDuringSchedulingIgnoredDuringExecution []PreferredSchedulingTerm `json:"preferredDuringSchedulingIgnoredDuringExecution,omitempty"`
+}
+
+// An empty preferred scheduling term matches all objects with implicit weight 0
+// (i.e. it's a no-op). A null preferred scheduling term matches no objects (i.e. is also a no-op).
+type PreferredSchedulingTerm struct {
+	// Weight associated with matching the corresponding nodeSelectorTerm, in the range 1-100.
+	Weight int `json:"weight"`
+	// A node selector term, associated with the corresponding weight.
+	Preference NodeSelectorTerm `json:"preference"`
+}
+
 // PodSpec is a description of a pod
 type PodSpec struct {
 	Volumes []Volume `json:"volumes"`