forked from kubernetes-sigs/aws-load-balancer-controller
/
endpoint_utils.go
73 lines (66 loc) · 2.36 KB
/
endpoint_utils.go
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package backend
import (
corev1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/labels"
elbv2api "github.com/sonal-chauhan/aws-load-balancer-controller/apis/elbv2/v1beta1"
)
const (
labelNodeRoleMaster = "node-role.kubernetes.io/master"
labelNodeRoleExcludeBalancer = "node.kubernetes.io/exclude-from-external-load-balancers"
labelAlphaNodeRoleExcludeBalancer = "alpha.service-controller.kubernetes.io/exclude-balancer"
labelEKSComputeType = "eks.amazonaws.com/compute-type"
toBeDeletedByCATaint = "ToBeDeletedByClusterAutoscaler"
)
var (
// Remember to update docs/guide/targetgroupbinding/targetgroupbinding.md if changing
defaultTrafficProxyNodeLabelSelector = metav1.LabelSelector{
MatchExpressions: []metav1.LabelSelectorRequirement{
{
Key: labelNodeRoleMaster,
Operator: metav1.LabelSelectorOpDoesNotExist,
},
{
Key: labelNodeRoleExcludeBalancer,
Operator: metav1.LabelSelectorOpDoesNotExist,
},
{
Key: labelAlphaNodeRoleExcludeBalancer,
Operator: metav1.LabelSelectorOpDoesNotExist,
},
{
Key: labelEKSComputeType,
Operator: metav1.LabelSelectorOpNotIn,
Values: []string{"fargate"},
},
},
}
)
// GetTrafficProxyNodeSelector returns the trafficProxy node label selector for specific targetGroupBinding.
func GetTrafficProxyNodeSelector(tgb *elbv2api.TargetGroupBinding) (labels.Selector, error) {
selector, err := metav1.LabelSelectorAsSelector(&defaultTrafficProxyNodeLabelSelector)
if err != nil {
return nil, err
}
if tgb.Spec.NodeSelector != nil {
customSelector, err := metav1.LabelSelectorAsSelector(tgb.Spec.NodeSelector)
if err != nil {
return nil, err
}
req, _ := customSelector.Requirements()
selector = selector.Add(req...)
}
return selector, nil
}
// IsNodeSuitableAsTrafficProxy check whether node is suitable as a traffic proxy.
// This should be checked in additional to the nodeSelector defined in TargetGroupBinding.
func IsNodeSuitableAsTrafficProxy(node *corev1.Node) bool {
// ToBeDeletedByClusterAutoscaler taint is added by cluster autoscaler before removing node from cluster
// Marking the node as unsuitable for traffic once the taint is observed on the node
for _, taint := range node.Spec.Taints {
if taint.Key == toBeDeletedByCATaint {
return false
}
}
return true
}