diff --git a/chartpress.yaml b/chartpress.yaml index 6e32a1609e..d18074f0d1 100644 --- a/chartpress.yaml +++ b/chartpress.yaml @@ -58,3 +58,7 @@ charts: # singleuser-sample, a primitive user container to start with. singleuser-sample: valuesPath: singleuser.image + + # taint-manager, an initContainer to add/remove taint for a node + taint-manager: + valuesPath: prePuller.taintmanager.image diff --git a/images/taint-manager/.gitignore b/images/taint-manager/.gitignore new file mode 100644 index 0000000000..0d12116dfb --- /dev/null +++ b/images/taint-manager/.gitignore @@ -0,0 +1,2 @@ +.idea +taintmanager diff --git a/images/taint-manager/Dockerfile b/images/taint-manager/Dockerfile new file mode 100644 index 0000000000..de96bf6b59 --- /dev/null +++ b/images/taint-manager/Dockerfile @@ -0,0 +1,25 @@ +# syntax=docker/dockerfile:1 + +## Build +FROM golang:1.18-bullseye AS build + +WORKDIR /app + +COPY go.mod ./ +COPY go.sum ./ +RUN go mod download + +COPY *.go ./ + +RUN go build -o /taintmanager + +## Deploy +FROM gcr.io/distroless/base-debian11 + +WORKDIR / + +COPY --from=build /taintmanager /taintmanager + +USER nonroot:nonroot + +CMD ["/taintmanager"] diff --git a/images/taint-manager/README.md b/images/taint-manager/README.md new file mode 100644 index 0000000000..022580a978 --- /dev/null +++ b/images/taint-manager/README.md @@ -0,0 +1,29 @@ +# In Cluster Taint Manager + +To add or remove taint within a pod. The default mode is to run as a pod in a Kubernetes cluster. It will try to +authenticate to K8S API server with in-cluster config (the service account token mounted inside pod). It also uses +downward API to retrieve the node name where the pod is running on in order to change the taint. + +## Compile + +``` +GOOS=linux GOARCH=amd64 go build -o taintmanager taintmanager.go +``` + +## Development and Debug + +To test outside a cluster, commandline parameter `-kubeconfig` and `-node` can be specified. If `-kubeconfig` is not +specified, taintmanager will try to load the kubeconfig from default path `HOME/.kube/config` + +Using default kubeconfig: + +``` +taintmanager -node f6.workers.ctlt.ubc.ca -remove hub.jupyter.org/imagepulling:NoExecute +``` + +## Test in Cluster + +The `test` directory contains YAML files for deploy a pod with required permissions to run taintmanager. +Please change `namespace` field in `clusterrolebinding.yaml` before deploying to a cluster. + +After deploying yaml files, run `kubectl cp` to copy compiled binary to the target pod and run the binary inside pod. diff --git a/images/taint-manager/go.mod b/images/taint-manager/go.mod new file mode 100644 index 0000000000..35bdcff638 --- /dev/null +++ b/images/taint-manager/go.mod @@ -0,0 +1,48 @@ +module taintmanager + +go 1.18 + +require ( + k8s.io/api v0.25.4 + k8s.io/apimachinery v0.25.4 + k8s.io/client-go v0.25.4 +) + +require ( + github.com/davecgh/go-spew v1.1.1 // indirect + github.com/emicklei/go-restful/v3 v3.10.1 // indirect + github.com/go-logr/logr v1.2.3 // indirect + github.com/go-openapi/jsonpointer v0.19.5 // indirect + github.com/go-openapi/jsonreference v0.20.0 // indirect + github.com/go-openapi/swag v0.22.3 // indirect + github.com/gogo/protobuf v1.3.2 // indirect + github.com/golang/protobuf v1.5.2 // indirect + github.com/google/gnostic v0.6.9 // indirect + github.com/google/go-cmp v0.5.9 // indirect + github.com/google/gofuzz v1.2.0 // indirect + github.com/imdario/mergo v0.3.6 // indirect + github.com/josharian/intern v1.0.0 // indirect + github.com/json-iterator/go v1.1.12 // indirect + github.com/mailru/easyjson v0.7.7 // indirect + github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect + github.com/modern-go/reflect2 v1.0.2 // indirect + github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect + github.com/spf13/pflag v1.0.5 // indirect + golang.org/x/net v0.2.0 // indirect + golang.org/x/oauth2 v0.2.0 // indirect + golang.org/x/sys v0.2.0 // indirect + golang.org/x/term v0.2.0 // indirect + golang.org/x/text v0.4.0 // indirect + golang.org/x/time v0.2.0 // indirect + google.golang.org/appengine v1.6.7 // indirect + google.golang.org/protobuf v1.28.1 // indirect + gopkg.in/inf.v0 v0.9.1 // indirect + gopkg.in/yaml.v2 v2.4.0 // indirect + gopkg.in/yaml.v3 v3.0.1 // indirect + k8s.io/klog/v2 v2.80.1 // indirect + k8s.io/kube-openapi v0.0.0-20221123214604-86e75ddd809a // indirect + k8s.io/utils v0.0.0-20221128185143-99ec85e7a448 // indirect + sigs.k8s.io/json v0.0.0-20221116044647-bc3834ca7abd // indirect + sigs.k8s.io/structured-merge-diff/v4 v4.2.3 // indirect + sigs.k8s.io/yaml v1.3.0 // indirect +) diff --git a/images/taint-manager/go.sum b/images/taint-manager/go.sum new file mode 100644 index 0000000000..86b9d35d86 --- /dev/null +++ b/images/taint-manager/go.sum @@ -0,0 +1,249 @@ +cloud.google.com/go v0.26.0/go.mod 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h1:B8JuhiUyNFVKdsE8h686QcCxMaH6HrOAZj4vswFpcB0= +sigs.k8s.io/structured-merge-diff/v4 v4.2.3 h1:PRbqxJClWWYMNV1dhaG4NsibJbArud9kFxnAMREiWFE= +sigs.k8s.io/structured-merge-diff/v4 v4.2.3/go.mod h1:qjx8mGObPmV2aSZepjQjbmb2ihdVs8cGKBraizNC69E= +sigs.k8s.io/yaml v1.3.0 h1:a2VclLzOGrwOHDiV8EfBGhvjHvP46CtW5j6POvhYGGo= +sigs.k8s.io/yaml v1.3.0/go.mod h1:GeOyir5tyXNByN85N/dRIT9es5UQNerPYEKK56eTBm8= diff --git a/images/taint-manager/taintmanager.go b/images/taint-manager/taintmanager.go new file mode 100644 index 0000000000..941564bee0 --- /dev/null +++ b/images/taint-manager/taintmanager.go @@ -0,0 +1,177 @@ +package main + +import ( + "context" + "flag" + "fmt" + v1 "k8s.io/api/core/v1" + "k8s.io/apimachinery/pkg/api/errors" + metav1 "k8s.io/apimachinery/pkg/apis/meta/v1" + "k8s.io/apimachinery/pkg/util/validation" + "k8s.io/client-go/kubernetes" + "k8s.io/client-go/rest" + "k8s.io/client-go/tools/clientcmd" + "k8s.io/client-go/util/homedir" + "log" + "os" + "path/filepath" + "strings" +) + +func buildConfig(kubeconfig string) (*rest.Config, error) { + // load kubeconfig from command line + if kubeconfig != "" { + cfg, err := clientcmd.BuildConfigFromFlags("", kubeconfig) + if err != nil { + return nil, err + } + log.Printf("Using kubeconfig %v.", kubeconfig) + return cfg, nil + } + + // try the default location HOME/.kube/config + if home := homedir.HomeDir(); home != "" { + kubeconfig = filepath.Join(home, ".kube", "config") + cfg, err := clientcmd.BuildConfigFromFlags("", kubeconfig) + if err == nil { + log.Printf("Using kubeconfig %v.", kubeconfig) + return cfg, nil + } + } + + // try in-cluster auth + cfg, err := rest.InClusterConfig() + if err != nil { + return nil, err + } + log.Printf("Using in-cluster config.") + return cfg, nil +} + +func usage() { + log.Println("Usage: taintmanager [-add TAINT] [-remove TAINT] [-node NODE_NAME] [-kubeconfig /PATH/TO/KUBECONFIG]") + flag.PrintDefaults() + os.Exit(1) +} + +func main() { + kubeconfig := flag.String("kubeconfig", "", "(optional) absolute path to the kubeconfig file") + nodeName := flag.String("node", "", "(optional) The name of the node to add/remove taints. Can be passed through environment variable MY_NODE_NAME") + taintAdd := flag.String("add", "", "The taint to add") + taintRemove := flag.String("remove", "", "The taint to remove") + flag.Parse() + + // load kubeconfig + config, err := buildConfig(*kubeconfig) + if err != nil { + log.Printf(err.Error()) + log.Printf("Failed to load kubeconfig") + usage() + } + + // parse taints + tAdd, errAdd := parseTaint(*taintAdd) + tRemove, errRemove := parseTaint(*taintRemove) + if errAdd != nil && errRemove != nil { + log.Println("Please specify at least one option -add or -remove") + usage() + } + + // check node name + if *nodeName == "" { + // try from env var + *nodeName = os.Getenv("MY_NODE_NAME") + } + if *nodeName == "" { + log.Println("Please specify the node name") + usage() + } + log.Printf("Node name %v\n", *nodeName) + + // creates the clientset + clientset, err := kubernetes.NewForConfig(config) + if err != nil { + panic(err.Error()) + } + node, err := clientset.CoreV1().Nodes().Get(context.TODO(), *nodeName, metav1.GetOptions{}) + if errors.IsNotFound(err) { + log.Printf("Node %v not found in default namespace\n", *nodeName) + } else if statusError, isStatus := err.(*errors.StatusError); isStatus { + log.Printf("Error getting node %v\n", statusError.ErrStatus.Message) + } else if err != nil { + panic(err.Error()) + } else { + log.Printf("Found node %v\n", node.GetName()) + for k, v := range node.Spec.Taints { + log.Printf("%v: %v\n", k, v) + } + if errAdd == nil { + node.Spec.Taints = append(node.Spec.Taints, tAdd) + clientset.CoreV1().Nodes().Update(context.TODO(), node, metav1.UpdateOptions{}) + log.Printf("Taint %v is added to node %v.", tAdd.ToString(), *nodeName) + } + if errRemove == nil { + for i, taint := range node.Spec.Taints { + if taint.Key == tRemove.Key { + node.Spec.Taints = append(node.Spec.Taints[:i], node.Spec.Taints[i+1:]...) + log.Printf("Taint %v is removed from node %v.", tRemove.ToString(), *nodeName) + clientset.CoreV1().Nodes().Update(context.TODO(), node, metav1.UpdateOptions{}) + } + } + } + } +} + +// copied from https://github.com/kubernetes/kubernetes/blob/v1.25.4/pkg/util/taints/taints.go +// parseTaint parses a taint from a string, whose form must be either +// '=:', ':', or ''. +func parseTaint(st string) (v1.Taint, error) { + var taint v1.Taint + + var key string + var value string + var effect v1.TaintEffect + + parts := strings.Split(st, ":") + switch len(parts) { + case 1: + key = parts[0] + case 2: + effect = v1.TaintEffect(parts[1]) + if err := validateTaintEffect(effect); err != nil { + return taint, err + } + + partsKV := strings.Split(parts[0], "=") + if len(partsKV) > 2 { + return taint, fmt.Errorf("invalid taint spec: %v", st) + } + key = partsKV[0] + if len(partsKV) == 2 { + value = partsKV[1] + if errs := validation.IsValidLabelValue(value); len(errs) > 0 { + return taint, fmt.Errorf("invalid taint spec: %v, %s", st, strings.Join(errs, "; ")) + } + } + default: + return taint, fmt.Errorf("invalid taint spec: %v", st) + } + + if errs := validation.IsQualifiedName(key); len(errs) > 0 { + return taint, fmt.Errorf("invalid taint spec: %v, %s", st, strings.Join(errs, "; ")) + } + + taint.Key = key + taint.Value = value + taint.Effect = effect + + return taint, nil +} + +func validateTaintEffect(effect v1.TaintEffect) error { + if effect != v1.TaintEffectNoSchedule && effect != v1.TaintEffectPreferNoSchedule && effect != v1.TaintEffectNoExecute { + return fmt.Errorf("invalid taint effect: %v, unsupported taint effect", effect) + } + + return nil +} diff --git a/images/taint-manager/test/clusterrole.yaml b/images/taint-manager/test/clusterrole.yaml new file mode 100644 index 0000000000..33553ce37c --- /dev/null +++ b/images/taint-manager/test/clusterrole.yaml @@ -0,0 +1,8 @@ +apiVersion: rbac.authorization.k8s.io/v1 +kind: ClusterRole +metadata: + name: taintmanager +rules: + - apiGroups: [""] # "" indicates the core API group + resources: ["nodes"] + verbs: ["get", "update"] diff --git a/images/taint-manager/test/clusterrolebinding.yaml b/images/taint-manager/test/clusterrolebinding.yaml new file mode 100644 index 0000000000..0eb5c77791 --- /dev/null +++ b/images/taint-manager/test/clusterrolebinding.yaml @@ -0,0 +1,16 @@ +apiVersion: rbac.authorization.k8s.io/v1 +# This role binding allows "jane" to read pods in the "default" namespace. +# You need to already have a Role named "pod-reader" in that namespace. +kind: ClusterRoleBinding +metadata: + name: taintmanager +subjects: + # You can specify more than one "subject" + - kind: ServiceAccount + name: taintmanager + namespace: default +roleRef: + # "roleRef" specifies the binding to a Role / ClusterRole + kind: ClusterRole #this must be Role or ClusterRole + name: taintmanager # this must match the name of the Role or ClusterRole you wish to bind to + apiGroup: rbac.authorization.k8s.io diff --git a/images/taint-manager/test/deployment-busybox.yaml b/images/taint-manager/test/deployment-busybox.yaml new file mode 100644 index 0000000000..280e750335 --- /dev/null +++ b/images/taint-manager/test/deployment-busybox.yaml @@ -0,0 +1,36 @@ +apiVersion: apps/v1 +kind: Deployment +metadata: + name: taintmanager +spec: + replicas: 1 + selector: + matchLabels: + app: taintmanager + template: + metadata: + labels: + app: taintmanager + spec: + serviceAccountName: taintmanager + containers: + - image: busybox + imagePullPolicy: IfNotPresent + name: taintmanager + command: ["sleep", "100000"] + env: + - name: MY_POD_NAME + valueFrom: + fieldRef: + fieldPath: metadata.name + - name: MY_NODE_NAME + valueFrom: + fieldRef: + fieldPath: spec.nodeName + ports: + - containerPort: 8080 + tolerations: + - key: "hub.jupyter.org/dedicated" + operator: "Exists" + effect: "NoSchedule" + restartPolicy: Always diff --git a/images/taint-manager/test/sa.yaml b/images/taint-manager/test/sa.yaml new file mode 100644 index 0000000000..73784cd76c --- /dev/null +++ b/images/taint-manager/test/sa.yaml @@ -0,0 +1,5 @@ +apiVersion: v1 +kind: ServiceAccount +metadata: + name: taintmanager + namespace: default diff --git a/jupyterhub/templates/image-puller/_helpers-daemonset.tpl b/jupyterhub/templates/image-puller/_helpers-daemonset.tpl index 16213b09be..1fee2f982a 100644 --- a/jupyterhub/templates/image-puller/_helpers-daemonset.tpl +++ b/jupyterhub/templates/image-puller/_helpers-daemonset.tpl @@ -51,6 +51,8 @@ spec: per node limit all k8s clusters have and have a higher priority than user-placeholder pods that could block an entire node. */}} + serviceAccount: taintmanager + serviceAccountName: taintmanager {{- if .Values.scheduling.podPriority.enabled }} priorityClassName: {{ include "jupyterhub.image-puller-priority.fullname" . }} {{- end }} @@ -58,7 +60,7 @@ spec: nodeSelector: {{- . | toYaml | nindent 8 }} {{- end }} - {{- with concat .Values.scheduling.userPods.tolerations .Values.singleuser.extraTolerations .Values.prePuller.extraTolerations }} + {{- with concat .Values.scheduling.userPods.tolerations .Values.singleuser.extraTolerations .Values.prePuller.extraTolerations .Values.prePuller.taintmanager.tolerations }} tolerations: {{- . | toYaml | nindent 8 }} {{- end }} @@ -70,11 +72,37 @@ spec: {{- include "jupyterhub.userNodeAffinityRequired" . | nindent 14 }} {{- end }} terminationGracePeriodSeconds: 0 - automountServiceAccountToken: false + automountServiceAccountToken: true {{- with include "jupyterhub.imagePullSecrets" (dict "root" . "image" .Values.singleuser.image) }} imagePullSecrets: {{ . }} {{- end }} initContainers: + {{- if .Values.prePuller.taintmanager.enabled }} + {{- $taint := first .Values.prePuller.taintmanager.tolerations }} + - name: taintmanager-adding + image: {{ .Values.prePuller.taintmanager.image.name }}:{{ .Values.prePuller.taintmanager.image.tag }} + command: + - /taintmanager + - -add + - {{ $taint.key }}:{{ $taint.effect }} + env: + - name: MY_POD_NAME + valueFrom: + fieldRef: + fieldPath: metadata.name + - name: MY_NODE_NAME + valueFrom: + fieldRef: + fieldPath: spec.nodeName + {{- with .Values.prePuller.resources }} + resources: + {{- . | toYaml | nindent 12 }} + {{- end }} + {{- with .Values.prePuller.containerSecurityContext }} + securityContext: + {{- . | toYaml | nindent 12 }} + {{- end }} + {{- end }} {{- /* --- Conditionally pull an image all user pods will use in an initContainer --- */}} {{- $blockWithIptables := hasKey .Values.singleuser.cloudMetadata "enabled" | ternary (not .Values.singleuser.cloudMetadata.enabled) .Values.singleuser.cloudMetadata.blockWithIptables }} {{- if $blockWithIptables }} @@ -200,6 +228,32 @@ spec: {{- . | toYaml | nindent 12 }} {{- end }} {{- end }} + {{- if .Values.prePuller.taintmanager.enabled }} + {{- $taint := first .Values.prePuller.taintmanager.tolerations }} + - name: taintmanager-removing + image: {{ .Values.prePuller.taintmanager.image.name }}:{{ .Values.prePuller.taintmanager.image.tag }} + command: + - /taintmanager + - -remove + - {{ $taint.key }}:{{ $taint.effect }} + env: + - name: MY_POD_NAME + valueFrom: + fieldRef: + fieldPath: metadata.name + - name: MY_NODE_NAME + valueFrom: + fieldRef: + fieldPath: spec.nodeName + {{- with .Values.prePuller.resources }} + resources: + {{- . | toYaml | nindent 12 }} + {{- end }} + {{- with .Values.prePuller.containerSecurityContext }} + securityContext: + {{- . | toYaml | nindent 12 }} + {{- end }} + {{- end }} containers: - name: pause image: {{ .Values.prePuller.pause.image.name }}:{{ .Values.prePuller.pause.image.tag }} diff --git a/jupyterhub/templates/image-puller/rbac.yaml b/jupyterhub/templates/image-puller/rbac.yaml index 996a59a4a3..22f6094a93 100644 --- a/jupyterhub/templates/image-puller/rbac.yaml +++ b/jupyterhub/templates/image-puller/rbac.yaml @@ -42,4 +42,40 @@ roleRef: name: {{ include "jupyterhub.hook-image-awaiter.fullname" . }} apiGroup: rbac.authorization.k8s.io {{- end }} +{{- if .Values.prePuller.taintmanager.enabled }} +--- +apiVersion: v1 +kind: ServiceAccount +metadata: + name: taintmanager + namespace: "{{ .Release.Namespace }}" + labels: + {{- include "jupyterhub.labels" . | nindent 4 }} +--- +apiVersion: rbac.authorization.k8s.io/v1 +kind: ClusterRole +metadata: + name: taintmanager + labels: + {{- include "jupyterhub.labels" . | nindent 4 }} +rules: +- apiGroups: [""] # "" indicates the core API group + resources: ["nodes"] + verbs: ["get", "update"] +--- +apiVersion: rbac.authorization.k8s.io/v1 +kind: ClusterRoleBinding +metadata: + name: taintmanager + labels: + {{- include "jupyterhub.labels" . | nindent 4 }} +subjects: +- kind: ServiceAccount + name: taintmanager + namespace: "{{ .Release.Namespace }}" +roleRef: + kind: ClusterRole + name: taintmanager + apiGroup: rbac.authorization.k8s.io +{{- end }} {{- end }} diff --git a/jupyterhub/templates/scheduling/user-placeholder/statefulset.yaml b/jupyterhub/templates/scheduling/user-placeholder/statefulset.yaml index 7f2c785b99..3ae61ab44d 100644 --- a/jupyterhub/templates/scheduling/user-placeholder/statefulset.yaml +++ b/jupyterhub/templates/scheduling/user-placeholder/statefulset.yaml @@ -47,7 +47,7 @@ spec: nodeSelector: {{- . | toYaml | nindent 8 }} {{- end }} - {{- with concat .Values.scheduling.userPods.tolerations .Values.singleuser.extraTolerations }} + {{- with concat .Values.scheduling.userPods.tolerations .Values.singleuser.extraTolerations .Values.prePuller.taintmanager.tolerations }} tolerations: {{- . | toYaml | nindent 8 }} {{- end }} diff --git a/jupyterhub/values.schema.yaml b/jupyterhub/values.schema.yaml index 1375a536bb..b44ea00321 100644 --- a/jupyterhub/values.schema.yaml +++ b/jupyterhub/values.schema.yaml @@ -2847,6 +2847,20 @@ properties: properties: enabled: type: boolean + taintmanager: + type: object + additionalProperties: false + required: [enabled] + description: | + Manage the taints during the single user image prepulling. It will add + specified taint before image pulling and remove it after it's done. + This will prevent user pods being scheduled on the new node that doesn't + have user image in order to prevent long user wait. + properties: + enabled: + type: boolean + image: *image-spec + tolerations: *tolerations-spec pullProfileListImages: type: boolean description: | diff --git a/jupyterhub/values.yaml b/jupyterhub/values.yaml index 20c630807c..8cc710ed9a 100644 --- a/jupyterhub/values.yaml +++ b/jupyterhub/values.yaml @@ -573,6 +573,9 @@ scheduling: operator: Equal value: core effect: NoSchedule + - key: hub.jupyter.org/imagepulling + operator: Exists + effect: NoExecute nodeAffinity: matchNodePurpose: prefer userPods: @@ -623,6 +626,17 @@ prePuller: annotations: {} continuous: enabled: true + taintmanager: + enabled: true + image: + name: quay.io/jupyterhub/k8s-taint-manager + tag: "set-by-chartpress" + # taint/tolerations used for preventing user pods being scheduled while user image is being pulled + # only first element in the list is being used + tolerations: + - key: hub.jupyter.org/imagepulling + operator: Exists + effect: NoExecute pullProfileListImages: true extraImages: {} pause: