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nodegroup.go
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nodegroup.go
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package builder
import (
"fmt"
"strings"
cfn "github.com/aws/aws-sdk-go/service/cloudformation"
"github.com/aws/aws-sdk-go/service/ec2/ec2iface"
"github.com/aws/aws-sdk-go/service/iam/iamiface"
"github.com/pkg/errors"
gfn "github.com/weaveworks/goformation/v4/cloudformation"
gfnec2 "github.com/weaveworks/goformation/v4/cloudformation/ec2"
gfnt "github.com/weaveworks/goformation/v4/cloudformation/types"
"github.com/kris-nova/logger"
api "github.com/weaveworks/eksctl/pkg/apis/eksctl.io/v1alpha5"
"github.com/weaveworks/eksctl/pkg/cfn/outputs"
"github.com/weaveworks/eksctl/pkg/nodebootstrap"
"github.com/weaveworks/eksctl/pkg/vpc"
)
// NodeGroupResourceSet stores the resource information of the nodegroup
type NodeGroupResourceSet struct {
rs *resourceSet
clusterSpec *api.ClusterConfig
spec *api.NodeGroup
forceAddCNIPolicy bool
ec2API ec2iface.EC2API
iamAPI iamiface.IAMAPI
instanceProfileARN *gfnt.Value
securityGroups []*gfnt.Value
vpc *gfnt.Value
vpcImporter vpc.Importer
bootstrapper nodebootstrap.Bootstrapper
}
// NewNodeGroupResourceSet returns a resource set for a nodegroup embedded in a cluster config
func NewNodeGroupResourceSet(ec2API ec2iface.EC2API, iamAPI iamiface.IAMAPI, spec *api.ClusterConfig, ng *api.NodeGroup, bootstrapper nodebootstrap.Bootstrapper, forceAddCNIPolicy bool, vpcImporter vpc.Importer) *NodeGroupResourceSet {
return &NodeGroupResourceSet{
rs: newResourceSet(),
forceAddCNIPolicy: forceAddCNIPolicy,
clusterSpec: spec,
spec: ng,
ec2API: ec2API,
iamAPI: iamAPI,
vpcImporter: vpcImporter,
bootstrapper: bootstrapper,
}
}
// AddAllResources adds all the information about the nodegroup to the resource set
func (n *NodeGroupResourceSet) AddAllResources() error {
n.rs.template.Description = fmt.Sprintf(
"%s (AMI family: %s, SSH access: %v, private networking: %v) %s",
nodeGroupTemplateDescription,
n.spec.AMIFamily, api.IsEnabled(n.spec.SSH.Allow), n.spec.PrivateNetworking,
templateDescriptionSuffix)
n.Template().Mappings[servicePrincipalPartitionMapName] = servicePrincipalPartitionMappings
n.rs.defineOutputWithoutCollector(outputs.NodeGroupFeaturePrivateNetworking, n.spec.PrivateNetworking, false)
n.rs.defineOutputWithoutCollector(outputs.NodeGroupFeatureSharedSecurityGroup, n.spec.SecurityGroups.WithShared, false)
n.rs.defineOutputWithoutCollector(outputs.NodeGroupFeatureLocalSecurityGroup, n.spec.SecurityGroups.WithLocal, false)
n.vpc = n.vpcImporter.VPC()
if n.spec.Tags == nil {
n.spec.Tags = map[string]string{}
}
for k, v := range n.clusterSpec.Metadata.Tags {
if _, exists := n.spec.Tags[k]; !exists {
n.spec.Tags[k] = v
}
}
// Ensure MinSize is set, as it is required by the ASG cfn resource
// TODO this validation and default setting should happen way earlier than this
if n.spec.MinSize == nil {
if n.spec.DesiredCapacity == nil {
defaultNodeCount := api.DefaultNodeCount
n.spec.MinSize = &defaultNodeCount
} else {
n.spec.MinSize = n.spec.DesiredCapacity
}
logger.Info("--nodes-min=%d was set automatically for nodegroup %s", *n.spec.MinSize, n.spec.Name)
} else if n.spec.DesiredCapacity != nil && *n.spec.DesiredCapacity < *n.spec.MinSize {
return fmt.Errorf("--nodes value (%d) cannot be lower than --nodes-min value (%d)", *n.spec.DesiredCapacity, *n.spec.MinSize)
}
// Ensure MaxSize is set, as it is required by the ASG cfn resource
if n.spec.MaxSize == nil {
if n.spec.DesiredCapacity == nil {
n.spec.MaxSize = n.spec.MinSize
} else {
n.spec.MaxSize = n.spec.DesiredCapacity
}
logger.Info("--nodes-max=%d was set automatically for nodegroup %s", *n.spec.MaxSize, n.spec.Name)
} else if n.spec.DesiredCapacity != nil && *n.spec.DesiredCapacity > *n.spec.MaxSize {
return fmt.Errorf("--nodes value (%d) cannot be greater than --nodes-max value (%d)", *n.spec.DesiredCapacity, *n.spec.MaxSize)
} else if *n.spec.MaxSize < *n.spec.MinSize {
return fmt.Errorf("--nodes-min value (%d) cannot be greater than --nodes-max value (%d)", *n.spec.MinSize, *n.spec.MaxSize)
}
if err := n.addResourcesForIAM(); err != nil {
return err
}
n.addResourcesForSecurityGroups()
return n.addResourcesForNodeGroup()
}
// RenderJSON returns the rendered JSON
func (n *NodeGroupResourceSet) RenderJSON() ([]byte, error) {
return n.rs.renderJSON()
}
// Template returns the CloudFormation template
func (n *NodeGroupResourceSet) Template() gfn.Template {
return *n.rs.template
}
func (n *NodeGroupResourceSet) newResource(name string, resource gfn.Resource) *gfnt.Value {
return n.rs.newResource(name, resource)
}
func (n *NodeGroupResourceSet) addResourcesForNodeGroup() error {
launchTemplateName := gfnt.MakeFnSubString(fmt.Sprintf("${%s}", gfnt.StackName))
launchTemplateData, err := newLaunchTemplateData(n)
if err != nil {
return errors.Wrap(err, "could not add resources for nodegroup")
}
if n.spec.SSH != nil && api.IsSetAndNonEmptyString(n.spec.SSH.PublicKeyName) {
launchTemplateData.KeyName = gfnt.NewString(*n.spec.SSH.PublicKeyName)
}
launchTemplateData.BlockDeviceMappings = makeBlockDeviceMappings(n.spec.NodeGroupBase)
n.newResource("NodeGroupLaunchTemplate", &gfnec2.LaunchTemplate{
LaunchTemplateName: launchTemplateName,
LaunchTemplateData: launchTemplateData,
})
vpcZoneIdentifier, err := AssignSubnets(n.spec.NodeGroupBase, n.vpcImporter, n.clusterSpec, n.ec2API)
if err != nil {
return err
}
tags := []map[string]interface{}{
{
"Key": "Name",
"Value": generateNodeName(n.spec.NodeGroupBase, n.clusterSpec.Metadata),
"PropagateAtLaunch": "true",
},
{
"Key": "kubernetes.io/cluster/" + n.clusterSpec.Metadata.Name,
"Value": "owned",
"PropagateAtLaunch": "true",
},
}
if api.IsEnabled(n.spec.IAM.WithAddonPolicies.AutoScaler) {
tags = append(tags,
map[string]interface{}{
"Key": "k8s.io/cluster-autoscaler/enabled",
"Value": "true",
"PropagateAtLaunch": "true",
},
map[string]interface{}{
"Key": "k8s.io/cluster-autoscaler/" + n.clusterSpec.Metadata.Name,
"Value": "owned",
"PropagateAtLaunch": "true",
},
)
}
asg := nodeGroupResource(launchTemplateName, vpcZoneIdentifier, tags, n.spec)
n.newResource("NodeGroup", asg)
return nil
}
// generateNodeName formulates the name based on the configuration in input
func generateNodeName(ng *api.NodeGroupBase, meta *api.ClusterMeta) string {
var nameParts []string
if ng.InstancePrefix != "" {
nameParts = append(nameParts, ng.InstancePrefix, "-")
}
// this overrides the default naming convention
if ng.InstanceName != "" {
nameParts = append(nameParts, ng.InstanceName)
} else {
nameParts = append(nameParts, fmt.Sprintf("%s-%s-Node", meta.Name, ng.Name))
}
return strings.Join(nameParts, "")
}
// AssignSubnets subnets based on the specified availability zones
func AssignSubnets(spec *api.NodeGroupBase, vpcImporter vpc.Importer, clusterSpec *api.ClusterConfig, ec2API ec2iface.EC2API) (*gfnt.Value, error) {
// currently goformation type system doesn't allow specifying `VPCZoneIdentifier: { "Fn::ImportValue": ... }`,
// and tags don't have `PropagateAtLaunch` field, so we have a custom method here until this gets resolved
if len(spec.AvailabilityZones) > 0 || len(spec.Subnets) > 0 || api.IsEnabled(spec.EFAEnabled) {
subnets := clusterSpec.VPC.Subnets.Public
typ := "public"
if spec.PrivateNetworking {
subnets = clusterSpec.VPC.Subnets.Private
typ = "private"
}
subnetIDs, err := vpc.SelectNodeGroupSubnets(spec.AvailabilityZones, spec.Subnets, subnets, ec2API, clusterSpec.VPC.ID)
if api.IsEnabled(spec.EFAEnabled) && len(subnetIDs) > 1 {
subnetIDs = []string{subnetIDs[0]}
logger.Info("EFA requires all nodes be in a single subnet, arbitrarily choosing one: %s", subnetIDs)
}
return gfnt.NewStringSlice(subnetIDs...), errors.Wrapf(err, "couldn't find %s subnets", typ)
}
var subnets *gfnt.Value
if spec.PrivateNetworking {
subnets = vpcImporter.SubnetsPrivate()
} else {
subnets = vpcImporter.SubnetsPublic()
}
return subnets, nil
}
// GetAllOutputs collects all outputs of the nodegroup
func (n *NodeGroupResourceSet) GetAllOutputs(stack cfn.Stack) error {
return n.rs.GetAllOutputs(stack)
}
func newLaunchTemplateData(n *NodeGroupResourceSet) (*gfnec2.LaunchTemplate_LaunchTemplateData, error) {
userData, err := n.bootstrapper.UserData()
if err != nil {
return nil, err
}
launchTemplateData := &gfnec2.LaunchTemplate_LaunchTemplateData{
IamInstanceProfile: &gfnec2.LaunchTemplate_IamInstanceProfile{
Arn: n.instanceProfileARN,
},
ImageId: gfnt.NewString(n.spec.AMI),
UserData: gfnt.NewString(userData),
MetadataOptions: makeMetadataOptions(n.spec.NodeGroupBase),
TagSpecifications: makeTags(n.spec.NodeGroupBase, n.clusterSpec.Metadata),
}
if err := buildNetworkInterfaces(launchTemplateData, n.spec.InstanceTypeList(), api.IsEnabled(n.spec.EFAEnabled), n.securityGroups, n.ec2API); err != nil {
return nil, errors.Wrap(err, "couldn't build network interfaces for launch template data")
}
if api.IsEnabled(n.spec.EFAEnabled) && n.spec.Placement == nil {
groupName := n.newResource("NodeGroupPlacementGroup", &gfnec2.PlacementGroup{
Strategy: gfnt.NewString("cluster"),
})
launchTemplateData.Placement = &gfnec2.LaunchTemplate_Placement{
GroupName: groupName,
}
}
if !api.HasMixedInstances(n.spec) {
launchTemplateData.InstanceType = gfnt.NewString(n.spec.InstanceType)
} else {
launchTemplateData.InstanceType = gfnt.NewString(n.spec.InstancesDistribution.InstanceTypes[0])
}
if n.spec.EBSOptimized != nil {
launchTemplateData.EbsOptimized = gfnt.NewBoolean(*n.spec.EBSOptimized)
}
if n.spec.CPUCredits != nil {
launchTemplateData.CreditSpecification = &gfnec2.LaunchTemplate_CreditSpecification{
CpuCredits: gfnt.NewString(strings.ToLower(*n.spec.CPUCredits)),
}
}
if n.spec.Placement != nil {
launchTemplateData.Placement = &gfnec2.LaunchTemplate_Placement{
GroupName: gfnt.NewString(n.spec.Placement.GroupName),
}
}
return launchTemplateData, nil
}
func makeMetadataOptions(ng *api.NodeGroupBase) *gfnec2.LaunchTemplate_MetadataOptions {
imdsv2TokensRequired := "optional"
if api.IsEnabled(ng.DisableIMDSv1) || api.IsEnabled(ng.DisablePodIMDS) {
imdsv2TokensRequired = "required"
}
hopLimit := 2
if api.IsEnabled(ng.DisablePodIMDS) {
hopLimit = 1
}
return &gfnec2.LaunchTemplate_MetadataOptions{
HttpPutResponseHopLimit: gfnt.NewInteger(hopLimit),
HttpTokens: gfnt.NewString(imdsv2TokensRequired),
}
}
func nodeGroupResource(launchTemplateName *gfnt.Value, vpcZoneIdentifier interface{}, tags []map[string]interface{}, ng *api.NodeGroup) *awsCloudFormationResource {
ngProps := map[string]interface{}{
"VPCZoneIdentifier": vpcZoneIdentifier,
"Tags": tags,
}
if ng.InstancesDistribution != nil && ng.InstancesDistribution.CapacityRebalance {
ngProps["CapacityRebalance"] = ng.InstancesDistribution.CapacityRebalance
}
if ng.DesiredCapacity != nil {
ngProps["DesiredCapacity"] = fmt.Sprintf("%d", *ng.DesiredCapacity)
}
if ng.MinSize != nil {
ngProps["MinSize"] = fmt.Sprintf("%d", *ng.MinSize)
}
if ng.MaxSize != nil {
ngProps["MaxSize"] = fmt.Sprintf("%d", *ng.MaxSize)
}
if len(ng.ASGMetricsCollection) > 0 {
ngProps["MetricsCollection"] = metricsCollectionResource(ng.ASGMetricsCollection)
}
if len(ng.ClassicLoadBalancerNames) > 0 {
ngProps["LoadBalancerNames"] = ng.ClassicLoadBalancerNames
}
if len(ng.TargetGroupARNs) > 0 {
ngProps["TargetGroupARNs"] = ng.TargetGroupARNs
}
if api.HasMixedInstances(ng) {
ngProps["MixedInstancesPolicy"] = *mixedInstancesPolicy(launchTemplateName, ng)
} else {
ngProps["LaunchTemplate"] = map[string]interface{}{
"LaunchTemplateName": launchTemplateName,
"Version": gfnt.MakeFnGetAttString("NodeGroupLaunchTemplate", "LatestVersionNumber"),
}
}
rollingUpdate := map[string]interface{}{}
if len(ng.ASGSuspendProcesses) > 0 {
rollingUpdate["SuspendProcesses"] = ng.ASGSuspendProcesses
}
return &awsCloudFormationResource{
Type: "AWS::AutoScaling::AutoScalingGroup",
Properties: ngProps,
UpdatePolicy: map[string]map[string]interface{}{
"AutoScalingRollingUpdate": rollingUpdate,
},
}
}
func mixedInstancesPolicy(launchTemplateName *gfnt.Value, ng *api.NodeGroup) *map[string]interface{} {
instanceTypes := ng.InstancesDistribution.InstanceTypes
overrides := make([]map[string]string, len(instanceTypes))
for i, instanceType := range instanceTypes {
overrides[i] = map[string]string{
"InstanceType": instanceType,
}
}
policy := map[string]interface{}{
"LaunchTemplate": map[string]interface{}{
"LaunchTemplateSpecification": map[string]interface{}{
"LaunchTemplateName": launchTemplateName,
"Version": gfnt.MakeFnGetAttString("NodeGroupLaunchTemplate", "LatestVersionNumber"),
},
"Overrides": overrides,
},
}
instancesDistribution := map[string]string{}
// Only set the price if it was specified so otherwise AWS picks "on-demand price" as the default
if ng.InstancesDistribution.MaxPrice != nil {
instancesDistribution["SpotMaxPrice"] = fmt.Sprintf("%f", *ng.InstancesDistribution.MaxPrice)
}
if ng.InstancesDistribution.OnDemandBaseCapacity != nil {
instancesDistribution["OnDemandBaseCapacity"] = fmt.Sprintf("%d", *ng.InstancesDistribution.OnDemandBaseCapacity)
}
if ng.InstancesDistribution.OnDemandPercentageAboveBaseCapacity != nil {
instancesDistribution["OnDemandPercentageAboveBaseCapacity"] = fmt.Sprintf("%d", *ng.InstancesDistribution.OnDemandPercentageAboveBaseCapacity)
}
if ng.InstancesDistribution.SpotInstancePools != nil {
instancesDistribution["SpotInstancePools"] = fmt.Sprintf("%d", *ng.InstancesDistribution.SpotInstancePools)
}
if ng.InstancesDistribution.SpotAllocationStrategy != nil {
instancesDistribution["SpotAllocationStrategy"] = *ng.InstancesDistribution.SpotAllocationStrategy
}
policy["InstancesDistribution"] = instancesDistribution
return &policy
}
func metricsCollectionResource(asgMetricsCollection []api.MetricsCollection) []map[string]interface{} {
var metricsCollections []map[string]interface{}
for _, m := range asgMetricsCollection {
newCollection := make(map[string]interface{})
if len(m.Metrics) > 0 {
newCollection["Metrics"] = m.Metrics
}
newCollection["Granularity"] = m.Granularity
metricsCollections = append(metricsCollections, newCollection)
}
return metricsCollections
}