From 80db96d867871ceea382735390dd8f0c106a7aeb Mon Sep 17 00:00:00 2001 From: Samuel Lang Date: Fri, 17 Dec 2021 16:35:18 +0100 Subject: [PATCH] AWS CNI Mode MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit ✨ new operational mode of Direct Ingress Pod access This adds a new operational mode of adding the Ingress pods as Targets in the Target Groups directly, instead of the nodes where the Ingress is accessed through a node port. The core idea is based on the fact that standard AWS EKS cluster running AWS VPC CNI have their pods as first class members in the VPCs. Their IPs are directly reachable from the ALB/NLB target groups like the nodes are too, which means there is no necessity for the NodePort extra hop to take. There are several drivers and advantages accessing the pod directly vs a Nodeport: ## Delay and eventual consistency of AutoscalingGroup to ALB/NLB target group updates This has been the biggest trouble in operations, that the list of nodes in target groups is slower than the nodes are replaced which ends up in a black hole of no Ingresses available at a time. We are facing regularily downtimes especially when spot interruptions or ASG node rollings happen that the ALB/NLB takes up to 2 minutes to reflect the group change. For smaller clusters this leads to no Skipper instance being registered hence no target available to forward traffic. With this new mode the registration happens independently and instantly, the registration of targets up to be serving takes less than 10seconds! ## independent scaling of nodes With nodeports there is an eventual dependency on available nodes to scale the Ingress. Plus the Ingress pod cannot be replaced in place but requires a termination first and then rescheduling. For a certain time which can be more than a minute, this node is offline as an Ingress. With this mode the host networking and node port is obsolete, which allows node indepent scaling of Skipper pods! Skipper becomes a regular deployment and its replicaSet can be indepent on the cluster size. ## Save de/registering and instantaneous response Core idea is the event based registration to Kubernetes using pod `Informer` that receives immediate notifications about pod changes, which allow almost zero delayed updates on the target groups. The registration happens as soon as the pod received an IP from AWS VPC. Hence the readiness probe of the ALB/NLB starts to monitor already during scheduling of the pod, serving the earliest possible. Tests in lab show pods serving ALB traffic well under 10s from scheduling! Deregistration happens bound to the kubernetes event. That means the LB is now in sync with the cluster and will stop sending traffic before the pod is actually terminated. This implement save deregistering without traffic loss. ## TG without unhealthy targets Since the IP based TGs are managed now by this controller, they represent pods and thus all of them are shown healthy, otherwise removed by this controller. # Implementation details: * client-go Informer: This high level functions are providing a convenient access to event registrations of kubernetes. Since the event registration is the key of fast response and efficient compared to high rate polling, using this standard factory methods seems standing to reason. ## Todo Settle on the impelemtation agreement and finish it up by adding unit tests. ## Tests * successful transistion of TG from type Instance to type IP vice versa * the controller registers pods that are discovered * the controller deregisters pods that are "terminating" status * the controller recovers desired state if manual intervention on the TG happened by "resyncing" * it removes pods that are killed or dead ## misc * extended the service account with required RBAC permissions to watch/list pods * added example of Skipper without a HostNetwork and NodePort --- aws/adapter.go | 105 ++++++++- aws/asg.go | 19 ++ aws/asg_test.go | 4 + aws/cf.go | 1 + aws/cf_template.go | 6 + controller.go | 19 +- deploy/ingress-serviceaccount.yaml | 2 + deploy/skipper.AWSCNI.yaml.example | 88 +++++++ go.mod | 5 +- go.sum | 367 ++++++++++++++++++++++++++++- kubernetes/adapter.go | 13 + kubernetes/client.go | 11 + kubernetes/pods.go | 98 ++++++++ kubernetes/pods_test.go | 45 ++++ worker.go | 45 ++++ 15 files changed, 811 insertions(+), 17 deletions(-) create mode 100644 deploy/skipper.AWSCNI.yaml.example create mode 100644 kubernetes/pods.go create mode 100644 kubernetes/pods_test.go diff --git a/aws/adapter.go b/aws/adapter.go index 2cb9b4ee..433fae27 100644 --- a/aws/adapter.go +++ b/aws/adapter.go @@ -74,6 +74,14 @@ type Adapter struct { denyInternalRespBody string denyInternalRespContentType string denyInternalRespStatusCode int + TargetCNI targetCNIconfig +} + +type targetCNIconfig struct { + Enabled bool + Endpoints []string + TargetGroupARNs []string + TargetGroupCh chan []string } type manifest struct { @@ -124,11 +132,14 @@ const ( DefaultNLBCrossZone = false DefaultNLBHTTPEnabled = false - nameTag = "Name" - LoadBalancerTypeApplication = "application" - LoadBalancerTypeNetwork = "network" - IPAddressTypeIPV4 = "ipv4" - IPAddressTypeDualstack = "dualstack" + nameTag = "Name" + LoadBalancerTypeApplication = "application" + LoadBalancerTypeNetwork = "network" + IPAddressTypeIPV4 = "ipv4" + IPAddressTypeDualstack = "dualstack" + TargetAccessModeAWSCNI = "AWSCNI" + TargetAccessModeNodePort = "NodePort" + DefaultTargetCNILabelSelector = "kube-system/application=skipper-ingress" ) var ( @@ -225,6 +236,10 @@ func NewAdapter(clusterID, newControllerID, vpcID string, debug, disableInstrume nlbCrossZone: DefaultNLBCrossZone, nlbHTTPEnabled: DefaultNLBHTTPEnabled, customFilter: DefaultCustomFilter, + TargetCNI: targetCNIconfig{ + Enabled: false, + TargetGroupCh: make(chan []string, 10), + }, } adapter.manifest, err = buildManifest(adapter, clusterID, vpcID) @@ -432,6 +447,15 @@ func (a *Adapter) WithInternalDomains(domains []string) *Adapter { return a } +// WithTargetAccessMode returns the receiver adapter after defining the target access mode +func (a *Adapter) WithTargetAccessMode(t string) *Adapter { + a.TargetCNI.Enabled = false + if t == TargetAccessModeAWSCNI { + a.TargetCNI.Enabled = true + } + return a +} + // WithDenyInternalDomains returns the receiver adapter after setting // the denyInternalDomains config. func (a *Adapter) WithDenyInternalDomains(deny bool) *Adapter { @@ -568,6 +592,18 @@ func (a *Adapter) UpdateTargetGroupsAndAutoScalingGroups(stacks []*Stack, proble return } + // split the full list into relevant TG types + targetTypesARNs, err := categorizeTargetTypeInstance(a.elbv2, targetGroupARNs) + if err != nil { + problems.Add("failed to categorize Target Type Instance: %w", err) + return + } + + // update the CNI TG list + if a.TargetCNI.Enabled { + a.TargetCNI.TargetGroupCh <- targetTypesARNs[elbv2.TargetTypeEnumIp] + } + ownerTags := map[string]string{ clusterIDTagPrefix + a.ClusterID(): resourceLifecycleOwned, kubernetesCreatorTag: a.controllerID, @@ -575,7 +611,7 @@ func (a *Adapter) UpdateTargetGroupsAndAutoScalingGroups(stacks []*Stack, proble for _, asg := range a.TargetedAutoScalingGroups { // This call is idempotent and safe to execute every time - if err := updateTargetGroupsForAutoScalingGroup(a.autoscaling, a.elbv2, targetGroupARNs, asg.name, ownerTags); err != nil { + if err := updateTargetGroupsForAutoScalingGroup(a.autoscaling, a.elbv2, targetTypesARNs[elbv2.TargetTypeEnumInstance], asg.name, ownerTags); err != nil { problems.Add("failed to update target groups for autoscaling group %q: %w", asg.name, err) } } @@ -592,13 +628,13 @@ func (a *Adapter) UpdateTargetGroupsAndAutoScalingGroups(stacks []*Stack, proble runningSingleInstances := a.RunningSingleInstances() if len(runningSingleInstances) != 0 { // This call is idempotent too - if err := registerTargetsOnTargetGroups(a.elbv2, targetGroupARNs, runningSingleInstances); err != nil { + if err := registerTargetsOnTargetGroups(a.elbv2, targetTypesARNs[elbv2.TargetTypeEnumInstance], runningSingleInstances); err != nil { problems.Add("failed to register instances %q in target groups: %w", runningSingleInstances, err) } } if len(a.obsoleteInstances) != 0 { // Deregister instances from target groups and clean up list of obsolete instances - if err := deregisterTargetsOnTargetGroups(a.elbv2, targetGroupARNs, a.obsoleteInstances); err != nil { + if err := deregisterTargetsOnTargetGroups(a.elbv2, targetTypesARNs[elbv2.TargetTypeEnumInstance], a.obsoleteInstances); err != nil { problems.Add("failed to deregister instances %q in target groups: %w", a.obsoleteInstances, err) } else { a.obsoleteInstances = make([]string, 0) @@ -665,6 +701,7 @@ func (a *Adapter) CreateStack(certificateARNs []string, scheme, securityGroup, o http2: http2, tags: a.stackTags, internalDomains: a.internalDomains, + targetAccessModeCNI: a.TargetCNI.Enabled, denyInternalDomains: a.denyInternalDomains, denyInternalDomainsResponse: denyResp{ body: a.denyInternalRespBody, @@ -720,6 +757,7 @@ func (a *Adapter) UpdateStack(stackName string, certificateARNs map[string]time. http2: http2, tags: a.stackTags, internalDomains: a.internalDomains, + targetAccessModeCNI: a.TargetCNI.Enabled, denyInternalDomains: a.denyInternalDomains, denyInternalDomainsResponse: denyResp{ body: a.denyInternalRespBody, @@ -1009,3 +1047,54 @@ func nonTargetedASGs(ownedASGs, targetedASGs map[string]*autoScalingGroupDetails return nonTargetedASGs } + +// SetTargetsOnCNITargetGroups implements desired state for CNI target groups +// by polling the current list of targets thus creating a diff of what needs to be added and removed. +func (a *Adapter) SetTargetsOnCNITargetGroups() error { + if a.TargetCNI.TargetGroupARNs == nil || len(a.TargetCNI.TargetGroupARNs) == 0 { + log.Info("No target group ARNs cached for CNI") + return nil + } + for _, targetGroupARN := range a.TargetCNI.TargetGroupARNs { + tgh, err := a.elbv2.DescribeTargetHealth(&elbv2.DescribeTargetHealthInput{TargetGroupArn: &targetGroupARN}) + if err != nil { + return fmt.Errorf("unable to describe target health %w", err) + } + registeredInstances := make([]string, len(tgh.TargetHealthDescriptions)) + for i, target := range tgh.TargetHealthDescriptions { + registeredInstances[i] = *target.Target.Id + } + toregister := difference(a.TargetCNI.Endpoints, registeredInstances) + if len(toregister) > 0 { + log.Info("Registering CNI targets: ", toregister) + err := registerTargetsOnTargetGroups(a.elbv2, a.TargetCNI.TargetGroupARNs, toregister) + if err != nil { + return err + } + } + toderegister := difference(registeredInstances, a.TargetCNI.Endpoints) + if len(toderegister) > 0 { + log.Info("Deregistering CNI targets: ", toderegister) + err := deregisterTargetsOnTargetGroups(a.elbv2, a.TargetCNI.TargetGroupARNs, toderegister) + if err != nil { + return err + } + } + } + return nil +} + +// difference returns the elements in `a` that aren't in `b`. +func difference(a, b []string) []string { + mb := make(map[string]struct{}, len(b)) + for _, x := range b { + mb[x] = struct{}{} + } + var diff []string + for _, x := range a { + if _, found := mb[x]; !found { + diff = append(diff, x) + } + } + return diff +} diff --git a/aws/asg.go b/aws/asg.go index 4c248a79..794e0131 100644 --- a/aws/asg.go +++ b/aws/asg.go @@ -260,6 +260,25 @@ func describeTargetGroups(elbv2svc elbv2iface.ELBV2API) (map[string]struct{}, er return targetGroups, err } +// map the target group slice into specific types such as instance, ip, etc +func categorizeTargetTypeInstance(elbv2svc elbv2iface.ELBV2API, allTGARNs []string) (map[string][]string, error) { + targetTypes := make(map[string][]string) + err := elbv2svc.DescribeTargetGroupsPagesWithContext(context.TODO(), &elbv2.DescribeTargetGroupsInput{}, + func(resp *elbv2.DescribeTargetGroupsOutput, lastPage bool) bool { + for _, tg := range resp.TargetGroups { + for _, v := range allTGARNs { + if v != aws.StringValue(tg.TargetGroupArn) { + continue + } + targetTypes[aws.StringValue(tg.TargetType)] = append(targetTypes[aws.StringValue(tg.TargetType)], aws.StringValue(tg.TargetGroupArn)) + } + } + return true + }) + log.Debugf("categorized target group arns: %#v", targetTypes) + return targetTypes, err +} + // tgHasTags returns true if the specified resource has the expected tags. func tgHasTags(descs []*elbv2.TagDescription, arn string, tags map[string]string) bool { for _, desc := range descs { diff --git a/aws/asg_test.go b/aws/asg_test.go index 7565a58c..470fd80f 100644 --- a/aws/asg_test.go +++ b/aws/asg_test.go @@ -263,6 +263,7 @@ func TestAttach(t *testing.T) { TargetGroups: []*elbv2.TargetGroup{ { TargetGroupArn: aws.String("foo"), + TargetType: aws.String(elbv2.TargetTypeEnumInstance), }, }, }, nil), @@ -301,6 +302,7 @@ func TestAttach(t *testing.T) { TargetGroups: []*elbv2.TargetGroup{ { TargetGroupArn: aws.String("foo"), + TargetType: aws.String(elbv2.TargetTypeEnumInstance), }, }, }, nil), @@ -466,9 +468,11 @@ func TestAttach(t *testing.T) { TargetGroups: []*elbv2.TargetGroup{ { TargetGroupArn: aws.String("foo"), + TargetType: aws.String(elbv2.TargetTypeEnumInstance), }, { TargetGroupArn: aws.String("bar"), + TargetType: aws.String(elbv2.TargetTypeEnumInstance), }, }, }, nil), diff --git a/aws/cf.go b/aws/cf.go index 058883dc..ed92772a 100644 --- a/aws/cf.go +++ b/aws/cf.go @@ -164,6 +164,7 @@ type stackSpec struct { denyInternalDomainsResponse denyResp internalDomains []string tags map[string]string + targetAccessModeCNI bool } type healthCheck struct { diff --git a/aws/cf_template.go b/aws/cf_template.go index c5b0af06..75a2b7b2 100644 --- a/aws/cf_template.go +++ b/aws/cf_template.go @@ -8,6 +8,7 @@ import ( "crypto/sha256" "sort" + "github.com/aws/aws-sdk-go/service/elbv2" cloudformation "github.com/mweagle/go-cloudformation" ) @@ -444,6 +445,10 @@ func generateDenyInternalTrafficRule(listenerName string, rulePriority int64, in } func newTargetGroup(spec *stackSpec, targetPortParameter string) *cloudformation.ElasticLoadBalancingV2TargetGroup { + targetType := elbv2.TargetTypeEnumInstance + if spec.targetAccessModeCNI { + targetType = elbv2.TargetTypeEnumIp + } protocol := "HTTP" healthCheckProtocol := "HTTP" healthyThresholdCount, unhealthyThresholdCount := spec.albHealthyThresholdCount, spec.albUnhealthyThresholdCount @@ -472,6 +477,7 @@ func newTargetGroup(spec *stackSpec, targetPortParameter string) *cloudformation UnhealthyThresholdCount: cloudformation.Integer(int64(unhealthyThresholdCount)), Port: cloudformation.Ref(targetPortParameter).Integer(), Protocol: cloudformation.String(protocol), + TargetType: cloudformation.String(targetType), VPCID: cloudformation.Ref(parameterTargetGroupVPCIDParameter).String(), } diff --git a/controller.go b/controller.go index 1235125a..c4e53630 100644 --- a/controller.go +++ b/controller.go @@ -82,6 +82,8 @@ var ( nlbHTTPEnabled bool ingressAPIVersion string internalDomains []string + targetAccessMode string + targetCNIPodSelector string denyInternalDomains bool denyInternalRespBody string denyInternalRespContentType string @@ -280,6 +282,10 @@ func loadSettings() error { Default("text/plain").StringVar(&denyInternalRespContentType) kingpin.Flag("deny-internal-domains-response-status-code", "Defines the response status code for a request identified as to an internal domain when -deny-internal-domains is set."). Default("401").IntVar(&denyInternalRespStatusCode) + kingpin.Flag("target-access-mode", "Target group accessing Ingress via NodePort or AWS VPC CNI. Set to ASG for NodePort access or CNI for pod direct IP access."). + Default(aws.TargetAccessModeNodePort).EnumVar(&targetAccessMode, aws.TargetAccessModeNodePort, aws.TargetAccessModeAWSCNI) + kingpin.Flag("target-cni-pod-selector", "AWS VPC CNI only. Defines the query (namespace/labelselector) for ingress pods that should be linked to target group. Format 'namespace/key=value'."). + Default(aws.DefaultTargetCNILabelSelector).StringVar(&targetCNIPodSelector) kingpin.Parse() blacklistCertArnMap = make(map[string]bool) @@ -287,6 +293,10 @@ func loadSettings() error { blacklistCertArnMap[s] = true } + if sl := strings.SplitN(targetCNIPodSelector, "/", 2); len(sl) != 2 || sl[0] == "" || sl[1] == "" { + return fmt.Errorf("Invalid target-cni-pod-selector format") + } + if creationTimeout < 1*time.Minute { return fmt.Errorf("invalid creation timeout %d. please specify a value > 1min", creationTimeout) } @@ -410,7 +420,8 @@ func main() { WithDenyInternalDomains(denyInternalDomains). WithInternalDomainsDenyResponse(denyInternalRespBody). WithInternalDomainsDenyResponseStatusCode(denyInternalRespStatusCode). - WithInternalDomainsDenyResponseContenType(denyInternalRespContentType) + WithInternalDomainsDenyResponseContenType(denyInternalRespContentType). + WithTargetAccessMode(targetAccessMode) log.Debug("certs.NewCachingProvider") certificatesProvider, err := certs.NewCachingProvider( @@ -444,6 +455,10 @@ func main() { if err != nil { log.Fatal(err) } + if err = kubeAdapter.NewInclusterConfigClientset(); err != nil { + log.Fatal(err) + } + kubeAdapter.WithTargetCNIPodSelector(targetCNIPodSelector) certificatesPerALB := maxCertsPerALB if disableSNISupport { @@ -465,10 +480,12 @@ func main() { log.Infof("ALB Logging S3 Prefix: %s", awsAdapter.S3Prefix()) log.Infof("CloudWatch Alarm ConfigMap: %s", cwAlarmConfigMapLocation) log.Infof("Default LoadBalancer type: %s", loadBalancerType) + log.Infof("Target access mode: %s", targetAccessMode) ctx, cancel := context.WithCancel(context.Background()) go handleTerminationSignals(cancel, syscall.SIGTERM, syscall.SIGQUIT) go serveMetrics(metricsAddress) + go cniEventHandler(ctx, awsAdapter, kubeAdapter) startPolling( ctx, certificatesProvider, diff --git a/deploy/ingress-serviceaccount.yaml b/deploy/ingress-serviceaccount.yaml index 1fd640ad..0509b753 100644 --- a/deploy/ingress-serviceaccount.yaml +++ b/deploy/ingress-serviceaccount.yaml @@ -13,8 +13,10 @@ rules: - apiGroups: # only one of extensions, networking.k8s.io is needed depending on the --ingress-api-version flag - extensions - networking.k8s.io + - "" resources: - ingresses + - pods verbs: - get - list diff --git a/deploy/skipper.AWSCNI.yaml.example b/deploy/skipper.AWSCNI.yaml.example new file mode 100644 index 00000000..37aca9bb --- /dev/null +++ b/deploy/skipper.AWSCNI.yaml.example @@ -0,0 +1,88 @@ +# accessing skipper via CNI IP instead of HostPort exposed +# requires no HostNetwork + +apiVersion: apps/v1 +kind: Deployment +metadata: + name: skipper-ingress + namespace: kube-system + labels: + application: skipper-ingress +spec: + replicas: 3 + selector: + matchLabels: + application: skipper-ingress + template: + metadata: + name: skipper-ingress + labels: + application: skipper-ingress + spec: + priorityClassName: system-cluster-critical + serviceAccountName: skipper-ingress + containers: + - name: skipper-ingress + image: registry.opensource.zalan.do/teapot/skipper:latest + ports: + - name: ingress-port + containerPort: 9999 + - name: redirect-port + containerPort: 9998 + - name: metrics-port + containerPort: 9911 + args: + - "skipper" + - "-kubernetes" + - "-kubernetes-in-cluster" + - "-address=:9999" + - "-proxy-preserve-host" + - "-serve-host-metrics" + - "-enable-ratelimits" + - "-experimental-upgrade" + - "-metrics-exp-decay-sample" + - "-lb-healthcheck-interval=3s" + - "-metrics-flavour=codahale,prometheus" + - "-enable-connection-metrics" + resources: + requests: + cpu: 200m + memory: 200Mi + readinessProbe: + httpGet: + path: /kube-system/healthz + port: 9999 + initialDelaySeconds: 5 + timeoutSeconds: 1 +--- +apiVersion: apps/v1 +kind: Deployment +metadata: + name: kube-ingress-aws-controller + namespace: kube-system + labels: + application: kube-ingress-aws-controller + component: ingress +spec: + replicas: 1 + selector: + matchLabels: + application: kube-ingress-aws-controller + component: ingress + template: + metadata: + labels: + application: kube-ingress-aws-controller + component: ingress + annotations: + iam.amazonaws.com/role: arn:aws:iam::12345678901:role/YOUR_PRECONFIGURED_ROLE + spec: + serviceAccountName: kube-ingress-aws + containers: + - name: controller + image: registry.opensource.zalan.do/teapot/kube-ingress-aws-controller:latest + env: + - name: AWS_REGION + value: + args: + - --target-access-mode=AWSCNI diff --git a/go.mod b/go.mod index d023ad88..46aaca42 100644 --- a/go.mod +++ b/go.mod @@ -7,7 +7,6 @@ require ( github.com/aws/aws-sdk-go v1.42.16 github.com/ghodss/yaml v1.0.0 github.com/go-playground/universal-translator v0.17.0 // indirect - github.com/golang/protobuf v1.5.2 // indirect github.com/google/go-cmp v0.5.6 github.com/google/uuid v1.3.0 github.com/leodido/go-urn v1.2.1 // indirect @@ -19,5 +18,7 @@ require ( gopkg.in/alecthomas/kingpin.v2 v2.2.6 gopkg.in/go-playground/assert.v1 v1.2.1 // indirect gopkg.in/go-playground/validator.v9 v9.31.0 // indirect - gopkg.in/yaml.v2 v2.4.0 // indirect + k8s.io/api v0.22.0 + k8s.io/apimachinery v0.22.0 + k8s.io/client-go v0.22.0 ) diff --git a/go.sum b/go.sum index dc9cee03..ea9df84c 100644 --- a/go.sum +++ b/go.sum @@ -1,4 +1,38 @@ +cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= +cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU= +cloud.google.com/go v0.44.1/go.mod h1:iSa0KzasP4Uvy3f1mN/7PiObzGgflwredwwASm/v6AU= +cloud.google.com/go v0.44.2/go.mod 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h1:yfXDCHCao9+ENCvLSE62v9VSji2MKu5jeNfTrofGhJc= diff --git a/kubernetes/adapter.go b/kubernetes/adapter.go index 1f73f250..53494d39 100644 --- a/kubernetes/adapter.go +++ b/kubernetes/adapter.go @@ -8,10 +8,14 @@ import ( "github.com/aws/aws-sdk-go/service/elbv2" log "github.com/sirupsen/logrus" "github.com/zalando-incubator/kube-ingress-aws-controller/aws" + "k8s.io/client-go/kubernetes" ) type Adapter struct { kubeClient client + clientset *kubernetes.Clientset + cniPodNamespace string + cniPodLabelSelector string ingressClient *ingressClient ingressFilters []string ingressDefaultSecurityGroup string @@ -122,6 +126,7 @@ func NewAdapter(config *Config, ingressAPIVersion string, ingressClassFilters [] if err != nil { return nil, err } + return &Adapter{ kubeClient: c, ingressClient: &ingressClient{apiVersion: ingressAPIVersion}, @@ -409,3 +414,11 @@ func (a *Adapter) GetConfigMap(namespace, name string) (*ConfigMap, error) { Data: cm.Data, }, nil } + +// WithTargetCNIPodSelector returns the receiver adapter after setting +// the targetCNIservice config. +func (a *Adapter) WithTargetCNIPodSelector(ps string) *Adapter { + tslice := strings.SplitN(ps, "/", 2) + a.cniPodNamespace, a.cniPodLabelSelector = tslice[0], tslice[1] + return a +} diff --git a/kubernetes/client.go b/kubernetes/client.go index d6f8e10a..b5a01e68 100644 --- a/kubernetes/client.go +++ b/kubernetes/client.go @@ -14,6 +14,8 @@ import ( "time" "github.com/linki/instrumented_http" + "k8s.io/client-go/kubernetes" + "k8s.io/client-go/rest" ) var ErrResourceNotFound = errors.New("resource not found") @@ -147,3 +149,12 @@ func (c *simpleClient) createRequest(method, resource string, body io.Reader) (* } return req, nil } + +func (a *Adapter) NewInclusterConfigClientset() error { + kubeCfg, err := rest.InClusterConfig() + if err != nil { + return fmt.Errorf("Can't get in cluster config: %w", err) + } + a.clientset, err = kubernetes.NewForConfig(kubeCfg) + return err +} diff --git a/kubernetes/pods.go b/kubernetes/pods.go new file mode 100644 index 00000000..29530a63 --- /dev/null +++ b/kubernetes/pods.go @@ -0,0 +1,98 @@ +package kubernetes + +import ( + "context" + "sync" + "time" + + log "github.com/sirupsen/logrus" + corev1 "k8s.io/api/core/v1" + apisv1 "k8s.io/apimachinery/pkg/apis/meta/v1" + "k8s.io/apimachinery/pkg/labels" + "k8s.io/client-go/informers" + "k8s.io/client-go/tools/cache" +) + +const resyncInterval = 1 * time.Minute + +// PodInformer is a event handler for Pod events registered to, that builds a local list of valid and relevant pods +// and sends an event to the endpoint channel, triggering a resync of the targets. +func (a *Adapter) PodInformer(ctx context.Context, endpointChan chan []string) { + if a.cniPodNamespace+a.cniPodLabelSelector == "" { + log.Errorf("error scheduling PodInformer: namespace, service, and service port are required") + return + } + podEndpoints := sync.Map{} + + log.Infof("Watching for Pods with labelselector %s in namespace %s", a.cniPodNamespace, a.cniPodLabelSelector) + factory := informers.NewSharedInformerFactoryWithOptions(a.clientset, resyncInterval, informers.WithNamespace(a.cniPodNamespace), + informers.WithTweakListOptions(func(options *apisv1.ListOptions) { options.LabelSelector = a.cniPodLabelSelector })) + + informer := factory.Core().V1().Pods().Informer() + informer.AddEventHandler(cache.ResourceEventHandlerFuncs{ + UpdateFunc: func(_, newResource interface{}) { + pod, ok := newResource.(*corev1.Pod) + if !ok { + log.Printf("cannot cast object to corev1.Pod %v", newResource) + return + } + switch { + + case pod.DeletionTimestamp != nil: + name, exists := podEndpoints.LoadAndDelete(pod.Name) + if !exists { + return + } + log.Infof("Deleted Pod %s IP:%s", pod.Name, name) + queueEndpoints(&podEndpoints, endpointChan) + + case pod.Status.ContainerStatuses != nil && len(pod.Status.ContainerStatuses) > 0 && + pod.Status.ContainerStatuses[0].State.Running != nil && pod.Status.PodIP != "": + if _, isStored := podEndpoints.LoadOrStore(pod.Name, pod.Status.PodIP); isStored { + return + } + log.Infof("New Pod %s IP:%s", pod.Name, pod.Status.PodIP) + queueEndpoints(&podEndpoints, endpointChan) + } + }, + }) + + factory.Start(ctx.Done()) + if !cache.WaitForCacheSync(ctx.Done(), informer.HasSynced) { + log.Errorf("Timed out waiting for caches to sync") + return + } + + for { + list, err := factory.Core().V1().Pods().Lister().List(labels.Everything()) + if err == nil && len(list) > 0 { + break + } + log.Errorf("Error listing Pods with labelselector %s in namespace %s: %v", a.cniPodNamespace, a.cniPodLabelSelector, err) + time.Sleep(resyncInterval) + } + + // resyncing for desired state + go func() { + resyncer := time.NewTicker(resyncInterval) + defer resyncer.Stop() + for { + select { + case <-resyncer.C: + queueEndpoints(&podEndpoints, endpointChan) + case <-ctx.Done(): + return + } + } + }() + informer.Run(ctx.Done()) +} + +func queueEndpoints(podEndpoints *sync.Map, endpointChan chan []string) { + podList := []string{} + podEndpoints.Range(func(key, value interface{}) bool { + podList = append(podList, value.(string)) + return true + }) + endpointChan <- podList +} diff --git a/kubernetes/pods_test.go b/kubernetes/pods_test.go new file mode 100644 index 00000000..662428a1 --- /dev/null +++ b/kubernetes/pods_test.go @@ -0,0 +1,45 @@ +package kubernetes + +import ( + "context" + "os" + "testing" + + log "github.com/sirupsen/logrus" + "k8s.io/client-go/kubernetes" + "k8s.io/client-go/tools/clientcmd" +) + +func kubeconfig() *kubernetes.Clientset { + kubeconfig := os.Getenv("KUBECONFIG") + kubeCfg, err := clientcmd.BuildConfigFromFlags("", kubeconfig) + if err != nil { + panic(err.Error()) + } + clientset, err := kubernetes.NewForConfig(kubeCfg) + if err != nil { + log.Panicf("Can't get kubernetes client: %v", err) + } + return clientset +} + +func testEndpointSliceInformer(t *testing.T) { + tests := []struct { + name string + }{ + { + name: "test", + }, + } + for _, tt := range tests { + t.Run(tt.name, func(t *testing.T) { + epCh := make(chan []string, 10) + a := Adapter{ + clientset: kubeconfig(), + cniPodNamespace: "kube-system", + cniPodLabelSelector: "application=skipper-ingress", + } + a.PodInformer(context.TODO(), epCh) + }) + } +} diff --git a/worker.go b/worker.go index 0df2bcf8..e5144a77 100644 --- a/worker.go +++ b/worker.go @@ -47,6 +47,7 @@ const ( const ( maxTargetGroupSupported = 1000 + cniEventRateLimit = 5 * time.Second ) func (l *loadBalancer) Status() int { @@ -641,3 +642,47 @@ func getCloudWatchAlarmsFromConfigMap(configMap *kubernetes.ConfigMap) aws.Cloud return configList } + +// cniEventHandler syncronizes the events from kubernetes and the status updates from the load balancer controller. +// Events from kubernetes pod updates trigger a rate limited update of the target groups. +func cniEventHandler(ctx context.Context, a *aws.Adapter, k *kubernetes.Adapter) { + if !a.TargetCNI.Enabled { + return + } + log.Infoln("Starting CNI event handler") + + rateLimiter := time.NewTicker(cniEventRateLimit) + defer rateLimiter.Stop() + + epCh := make(chan []string, 10) + go k.PodInformer(ctx, epCh) + + for { + select { + case <-ctx.Done(): + return + case tgs := <-a.TargetCNI.TargetGroupCh: + log.Debugf("new message target groups: %v", tgs) + a.TargetCNI.TargetGroupARNs = tgs + case eps := <-epCh: + log.Debugf("new message endpoints: %v", eps) + a.TargetCNI.Endpoints = eps + // blocking for rate limits + <-rateLimiter.C + flush: + for { + // flush channel taking the latest message + select { + case eps := <-epCh: + a.TargetCNI.Endpoints = eps + default: + break flush + } + } + err := a.SetTargetsOnCNITargetGroups() + if err != nil { + log.Error(err) + } + } + } +}