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operator.go
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operator.go
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/*
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package operator
import (
"context"
"encoding/base64"
"errors"
"fmt"
"net"
"os"
"time"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/awserr"
awsclient "github.com/aws/aws-sdk-go/aws/client"
"github.com/aws/aws-sdk-go/aws/credentials/stscreds"
"github.com/aws/aws-sdk-go/aws/ec2metadata"
"github.com/aws/aws-sdk-go/aws/endpoints"
"github.com/aws/aws-sdk-go/aws/request"
"github.com/aws/aws-sdk-go/aws/session"
"github.com/aws/aws-sdk-go/service/ec2"
"github.com/aws/aws-sdk-go/service/ec2/ec2iface"
"github.com/aws/aws-sdk-go/service/eks"
"github.com/aws/aws-sdk-go/service/eks/eksiface"
"github.com/aws/aws-sdk-go/service/iam"
"github.com/aws/aws-sdk-go/service/ssm"
"github.com/patrickmn/go-cache"
"github.com/samber/lo"
corev1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/rest"
"k8s.io/client-go/transport"
"sigs.k8s.io/controller-runtime/pkg/log"
corev1beta1 "sigs.k8s.io/karpenter/pkg/apis/v1beta1"
"sigs.k8s.io/karpenter/pkg/operator"
"sigs.k8s.io/karpenter/pkg/operator/scheme"
"github.com/aws/karpenter-provider-aws/pkg/apis"
awscache "github.com/aws/karpenter-provider-aws/pkg/cache"
"github.com/aws/karpenter-provider-aws/pkg/operator/options"
"github.com/aws/karpenter-provider-aws/pkg/providers/amifamily"
"github.com/aws/karpenter-provider-aws/pkg/providers/instance"
"github.com/aws/karpenter-provider-aws/pkg/providers/instanceprofile"
"github.com/aws/karpenter-provider-aws/pkg/providers/instancetype"
"github.com/aws/karpenter-provider-aws/pkg/providers/launchtemplate"
"github.com/aws/karpenter-provider-aws/pkg/providers/pricing"
"github.com/aws/karpenter-provider-aws/pkg/providers/securitygroup"
"github.com/aws/karpenter-provider-aws/pkg/providers/subnet"
"github.com/aws/karpenter-provider-aws/pkg/providers/version"
)
func init() {
lo.Must0(apis.AddToScheme(scheme.Scheme))
corev1beta1.NormalizedLabels = lo.Assign(corev1beta1.NormalizedLabels, map[string]string{"topology.ebs.csi.aws.com/zone": corev1.LabelTopologyZone})
}
// Operator is injected into the AWS CloudProvider's factories
type Operator struct {
*operator.Operator
Session *session.Session
UnavailableOfferingsCache *awscache.UnavailableOfferings
EC2API ec2iface.EC2API
SubnetProvider subnet.Provider
SecurityGroupProvider securitygroup.Provider
InstanceProfileProvider instanceprofile.Provider
AMIProvider amifamily.Provider
AMIResolver *amifamily.Resolver
LaunchTemplateProvider launchtemplate.Provider
PricingProvider pricing.Provider
VersionProvider version.Provider
InstanceTypesProvider instancetype.Provider
InstanceProvider instance.Provider
}
func NewOperator(ctx context.Context, operator *operator.Operator) (context.Context, *Operator) {
config := &aws.Config{
STSRegionalEndpoint: endpoints.RegionalSTSEndpoint,
}
if assumeRoleARN := options.FromContext(ctx).AssumeRoleARN; assumeRoleARN != "" {
config.Credentials = stscreds.NewCredentials(session.Must(session.NewSession()), assumeRoleARN,
func(provider *stscreds.AssumeRoleProvider) { SetDurationAndExpiry(ctx, provider) })
}
sess := WithUserAgent(session.Must(session.NewSession(
request.WithRetryer(
config,
awsclient.DefaultRetryer{NumMaxRetries: awsclient.DefaultRetryerMaxNumRetries},
),
)))
if *sess.Config.Region == "" {
log.FromContext(ctx).V(1).Info("retrieving region from IMDS")
region, err := ec2metadata.New(sess).Region()
*sess.Config.Region = lo.Must(region, err, "failed to get region from metadata server")
}
ec2api := ec2.New(sess)
if err := CheckEC2Connectivity(ctx, ec2api); err != nil {
log.FromContext(ctx).Error(err, "ec2 api connectivity check failed")
os.Exit(1)
}
log.FromContext(ctx).WithValues("region", *sess.Config.Region).V(1).Info("discovered region")
clusterEndpoint, err := ResolveClusterEndpoint(ctx, eks.New(sess))
if err != nil {
log.FromContext(ctx).Error(err, "failed detecting cluster endpoint")
os.Exit(1)
} else {
log.FromContext(ctx).WithValues("cluster-endpoint", clusterEndpoint).V(1).Info("discovered cluster endpoint")
}
// We perform best-effort on resolving the kube-dns IP
kubeDNSIP, err := KubeDNSIP(ctx, operator.KubernetesInterface)
if err != nil {
// If we fail to get the kube-dns IP, we don't want to crash because this causes issues with custom DNS setups
// https://github.com/aws/karpenter-provider-aws/issues/2787
log.FromContext(ctx).V(1).Info(fmt.Sprintf("unable to detect the IP of the kube-dns service, %s", err))
} else {
log.FromContext(ctx).WithValues("kube-dns-ip", kubeDNSIP).V(1).Info("discovered kube dns")
}
unavailableOfferingsCache := awscache.NewUnavailableOfferings()
subnetProvider := subnet.NewDefaultProvider(ec2api, cache.New(awscache.DefaultTTL, awscache.DefaultCleanupInterval), cache.New(awscache.AvailableIPAddressTTL, awscache.DefaultCleanupInterval), cache.New(awscache.AssociatePublicIPAddressTTL, awscache.DefaultCleanupInterval))
securityGroupProvider := securitygroup.NewDefaultProvider(ec2api, cache.New(awscache.DefaultTTL, awscache.DefaultCleanupInterval))
instanceProfileProvider := instanceprofile.NewDefaultProvider(*sess.Config.Region, iam.New(sess), cache.New(awscache.InstanceProfileTTL, awscache.DefaultCleanupInterval))
pricingProvider := pricing.NewDefaultProvider(
ctx,
pricing.NewAPI(sess, *sess.Config.Region),
ec2api,
*sess.Config.Region,
)
versionProvider := version.NewDefaultProvider(operator.KubernetesInterface, cache.New(awscache.DefaultTTL, awscache.DefaultCleanupInterval))
amiProvider := amifamily.NewDefaultProvider(versionProvider, ssm.New(sess), ec2api, cache.New(awscache.DefaultTTL, awscache.DefaultCleanupInterval))
amiResolver := amifamily.NewResolver(amiProvider)
launchTemplateProvider := launchtemplate.NewDefaultProvider(
ctx,
cache.New(awscache.DefaultTTL, awscache.DefaultCleanupInterval),
ec2api,
eks.New(sess),
amiResolver,
securityGroupProvider,
subnetProvider,
lo.Must(GetCABundle(ctx, operator.GetConfig())),
operator.Elected(),
kubeDNSIP,
clusterEndpoint,
)
instanceTypeProvider := instancetype.NewDefaultProvider(
*sess.Config.Region,
cache.New(awscache.InstanceTypesAndZonesTTL, awscache.DefaultCleanupInterval),
ec2api,
subnetProvider,
unavailableOfferingsCache,
pricingProvider,
)
instanceProvider := instance.NewDefaultProvider(
ctx,
aws.StringValue(sess.Config.Region),
ec2api,
unavailableOfferingsCache,
instanceTypeProvider,
subnetProvider,
launchTemplateProvider,
)
return ctx, &Operator{
Operator: operator,
Session: sess,
UnavailableOfferingsCache: unavailableOfferingsCache,
EC2API: ec2api,
SubnetProvider: subnetProvider,
SecurityGroupProvider: securityGroupProvider,
InstanceProfileProvider: instanceProfileProvider,
AMIProvider: amiProvider,
AMIResolver: amiResolver,
VersionProvider: versionProvider,
LaunchTemplateProvider: launchTemplateProvider,
PricingProvider: pricingProvider,
InstanceTypesProvider: instanceTypeProvider,
InstanceProvider: instanceProvider,
}
}
// WithUserAgent adds a karpenter specific user-agent string to AWS session
func WithUserAgent(sess *session.Session) *session.Session {
userAgent := fmt.Sprintf("karpenter.sh-%s", operator.Version)
sess.Handlers.Build.PushBack(request.MakeAddToUserAgentFreeFormHandler(userAgent))
return sess
}
// CheckEC2Connectivity makes a dry-run call to DescribeInstanceTypes. If it fails, we provide an early indicator that we
// are having issues connecting to the EC2 API.
func CheckEC2Connectivity(ctx context.Context, api ec2iface.EC2API) error {
_, err := api.DescribeInstanceTypesWithContext(ctx, &ec2.DescribeInstanceTypesInput{DryRun: aws.Bool(true)})
var aerr awserr.Error
if errors.As(err, &aerr) && aerr.Code() == "DryRunOperation" {
return nil
}
return err
}
func ResolveClusterEndpoint(ctx context.Context, eksAPI eksiface.EKSAPI) (string, error) {
clusterEndpointFromOptions := options.FromContext(ctx).ClusterEndpoint
if clusterEndpointFromOptions != "" {
return clusterEndpointFromOptions, nil // cluster endpoint is explicitly set
}
out, err := eksAPI.DescribeClusterWithContext(ctx, &eks.DescribeClusterInput{
Name: aws.String(options.FromContext(ctx).ClusterName),
})
if err != nil {
return "", fmt.Errorf("failed to resolve cluster endpoint, %w", err)
}
return *out.Cluster.Endpoint, nil
}
func GetCABundle(ctx context.Context, restConfig *rest.Config) (*string, error) {
// Discover CA Bundle from the REST client. We could alternatively
// have used the simpler client-go InClusterConfig() method.
// However, that only works when Karpenter is running as a Pod
// within the same cluster it's managing.
if caBundle := options.FromContext(ctx).ClusterCABundle; caBundle != "" {
return lo.ToPtr(caBundle), nil
}
transportConfig, err := restConfig.TransportConfig()
if err != nil {
return nil, fmt.Errorf("discovering caBundle, loading transport config, %w", err)
}
_, err = transport.TLSConfigFor(transportConfig) // fills in CAData!
if err != nil {
return nil, fmt.Errorf("discovering caBundle, loading TLS config, %w", err)
}
return lo.ToPtr(base64.StdEncoding.EncodeToString(transportConfig.TLS.CAData)), nil
}
func KubeDNSIP(ctx context.Context, kubernetesInterface kubernetes.Interface) (net.IP, error) {
if kubernetesInterface == nil {
return nil, fmt.Errorf("no K8s client provided")
}
dnsService, err := kubernetesInterface.CoreV1().Services("kube-system").Get(ctx, "kube-dns", metav1.GetOptions{})
if err != nil {
return nil, err
}
kubeDNSIP := net.ParseIP(dnsService.Spec.ClusterIP)
if kubeDNSIP == nil {
return nil, fmt.Errorf("parsing cluster IP")
}
return kubeDNSIP, nil
}
func SetDurationAndExpiry(ctx context.Context, provider *stscreds.AssumeRoleProvider) {
provider.Duration = options.FromContext(ctx).AssumeRoleDuration
provider.ExpiryWindow = time.Duration(10) * time.Second
}