Remove subnet and security group selector defaulting. Limited relianc…

…e on cluster-name

pkg/apis/provisioning/v1alpha5/register.go

@@ -40,11 +40,11 @@ var (
 		metav1.AddToGroupVersion(scheme, SchemeGroupVersion)
 		return nil
 	})
-	ProvisionerNameLabelKey         = SchemeGroupVersion.Group + "/provisioner-name"
-	NotReadyTaintKey                = SchemeGroupVersion.Group + "/not-ready"
-	DoNotEvictPodAnnotationKey      = SchemeGroupVersion.Group + "/do-not-evict"
-	EmptinessTimestampAnnotationKey = SchemeGroupVersion.Group + "/emptiness-timestamp"
-	TerminationFinalizer            = SchemeGroupVersion.Group + "/termination"
+	ProvisionerNameLabelKey         = Group + "/provisioner-name"
+	NotReadyTaintKey                = Group + "/not-ready"
+	DoNotEvictPodAnnotationKey      = Group + "/do-not-evict"
+	EmptinessTimestampAnnotationKey = Group + "/emptiness-timestamp"
+	TerminationFinalizer            = Group + "/termination"
 )
 
 const (

pkg/cloudprovider/aws/apis/v1alpha1/provider_defaults.go

@@ -16,22 +16,16 @@ package v1alpha1
 
 import (
 	"context"
-	"fmt"
 
 	"github.com/aws/karpenter/pkg/apis/provisioning/v1alpha5"
 	"github.com/aws/karpenter/pkg/utils/functional"
-	"github.com/aws/karpenter/pkg/utils/injection"
 	v1 "k8s.io/api/core/v1"
 )
 
-var ClusterDiscoveryTagKeyFormat = "kubernetes.io/cluster/%s"
-
 // Default the constraints.
 func (c *Constraints) Default(ctx context.Context) {
 	c.defaultArchitecture()
 	c.defaultCapacityTypes()
-	c.defaultSubnets(injection.GetOptions(ctx).ClusterName)
-	c.defaultSecurityGroups(injection.GetOptions(ctx).ClusterName)
 }
 
 func (c *Constraints) defaultCapacityTypes() {
@@ -61,17 +55,3 @@ func (c *Constraints) defaultArchitecture() {
 		Values:   []string{v1alpha5.ArchitectureAmd64},
 	})
 }
-
-func (c *Constraints) defaultSubnets(clusterName string) {
-	if c.SubnetSelector != nil {
-		return
-	}
-	c.SubnetSelector = map[string]string{fmt.Sprintf(ClusterDiscoveryTagKeyFormat, clusterName): "*"}
-}
-
-func (c *Constraints) defaultSecurityGroups(clusterName string) {
-	if c.SecurityGroupSelector != nil {
-		return
-	}
-	c.SecurityGroupSelector = map[string]string{fmt.Sprintf(ClusterDiscoveryTagKeyFormat, clusterName): "*"}
-}

pkg/cloudprovider/aws/apis/v1alpha1/tags.go

@@ -20,28 +20,17 @@ import (
 
 	"github.com/aws/aws-sdk-go/aws"
 	"github.com/aws/aws-sdk-go/service/ec2"
+	"github.com/aws/karpenter/pkg/apis/provisioning/v1alpha5"
 	"github.com/aws/karpenter/pkg/utils/functional"
 	"github.com/aws/karpenter/pkg/utils/injection"
 )
 
-const (
-	// ClusterTagKeyFormat is set on all Kubernetes owned resources.
-	ClusterTagKeyFormat = "kubernetes.io/cluster/%s"
-	// KarpenterTagKeyFormat is set on all Karpenter owned resources.
-	KarpenterTagKeyFormat = "karpenter.sh/cluster/%s"
-)
-
-func MergeTags(ctx context.Context, customTags map[string]string) []*ec2.Tag {
-	// We'll set some default tags, but allow them to be overridden in the merge
-	managedTags := map[string]string{
-		"Name": fmt.Sprintf("karpenter.sh/cluster/%s/provisioner/%s",
-			injection.GetOptions(ctx).ClusterName, injection.GetNamespacedName(ctx).Name),
-		fmt.Sprintf(ClusterTagKeyFormat, injection.GetOptions(ctx).ClusterName):   "owned",
-		fmt.Sprintf(KarpenterTagKeyFormat, injection.GetOptions(ctx).ClusterName): "owned",
-	}
-	ec2Tags := []*ec2.Tag{}
-	for key, value := range functional.UnionStringMaps(managedTags, customTags) {
-		ec2Tags = append(ec2Tags, &ec2.Tag{Key: aws.String(key), Value: aws.String(value)})
+func MergeTags(ctx context.Context, custom ...map[string]string) (tags []*ec2.Tag) {
+	for key, value := range functional.UnionStringMaps(append(custom, map[string]string{
+		v1alpha5.ProvisionerNameLabelKey: injection.GetNamespacedName(ctx).Name,
+		"Name": fmt.Sprintf("%s/%s", v1alpha5.ProvisionerNameLabelKey, injection.GetNamespacedName(ctx).Name),
+	})...) {
+		tags = append(tags, &ec2.Tag{Key: aws.String(key), Value: aws.String(value)})
 	}
-	return ec2Tags
+	return tags
 }

website/content/en/docs/getting-started/_index.md

@@ -63,6 +63,8 @@ metadata:
   name: ${CLUSTER_NAME}
   region: ${AWS_DEFAULT_REGION}
   version: "1.21"
+  tags:
+    karpenter.sh/discovery: ${CLUSTER_NAME}
 managedNodeGroups:
   - instanceType: m5.large
     amiFamily: AmazonLinux2
@@ -82,21 +84,6 @@ Karpenter itself can run anywhere, including on [self-managed node groups](https
 
 Karpenter will provision EC2 instances in your account.
 
-### Tag Subnets
-
-Karpenter discovers subnets tagged `kubernetes.io/cluster/$CLUSTER_NAME`. Add this tag to subnets associated configured for your cluster.
-Retrieve the subnet IDs and tag them with the cluster name.
-
-```bash
-SUBNET_IDS=$(aws cloudformation describe-stacks \
-    --stack-name eksctl-${CLUSTER_NAME}-cluster \
-    --query 'Stacks[].Outputs[?OutputKey==`SubnetsPrivate`].OutputValue' \
-    --output text)
-aws ec2 create-tags \
-    --resources $(echo $SUBNET_IDS | tr ',' '\n') \
-    --tags Key="kubernetes.io/cluster/${CLUSTER_NAME}",Value=
-```
-
 ### Create the KarpenterNode IAM Role
 
 Instances launched by Karpenter must run with an InstanceProfile that grants permissions necessary to run containers and configure networking. Karpenter discovers the InstanceProfile using the name `KarpenterNodeRole-${ClusterName}`.
@@ -236,6 +223,10 @@ spec:
     resources:
       cpu: 1000
   provider:
+    subnetSelector:
+      karpenter.sh/discovery: ${CLUSTER_NAME}
+    securityGroupSelector:
+      karpenter.sh/discovery: ${CLUSTER_NAME}
     instanceProfile: KarpenterNodeInstanceProfile-${CLUSTER_NAME}
   ttlSecondsAfterEmpty: 30
 EOF