通过在ACK Serverless集群上部署安装VPA（vertical-pod-autoscaler），ACK Serverless可以提供垂直的容器伸缩的功能。VPA会基于Pod的资源使用情况自动为集群设置资源占用的限制，从而让集群将Pod调度到有足够资源的最佳节点上。VPA也会保持最初容器定义中资源request和limit的占比。本文介绍如何配置YAML实现容器的垂直伸缩。
前提条件
请确保您已完成以下操作：
已创建一个Kubernetes集群，且Kubernetes版本高于1.12。具体操作，请参见创建ACK Serverless集群。
已使用命令行工具连接集群。具体操作，请参见获取集群KubeConfig并通过kubectl工具连接集群。
已卸载集群中已经部署的VPA，以避免新安装的VPA与旧版VPA冲突而导致VPA不可用。
背景信息
重要
容器垂直伸缩功能目前处于试验阶段，请谨慎使用。
更新正在运行的Pod资源配置是VPA的一项试验性功能，会导致Pod的重建和重启，而且有可能被调度到其他的节点上。
VPA不会驱逐没有在副本控制器管理下的Pod。目前对于这类Pod，Auto模式等同于Initial模式。
目前VPA不能和监控CPU和内存度量的Horizontal Pod Autoscaler （HPA）同时运行，除非HPA只监控其他定制化的或者外部的资源度量。
VPA使用admission webhook作为其准入控制器。如果集群中有其他的admission webhook，需要确保它们不会与VPA发生冲突。准入控制器的执行顺序定义在API Server的配置参数中。
VPA会处理出现的绝大多数OOM（Out Of Memory）的事件，但不保证所有的场景下都有效。
VPA的性能还没有在大型集群中测试过。
VPA对Pod资源requests的修改值可能超过实际的资源上限，例如节点资源上限、空闲资源或资源配额，从而造成Pod处于Pending状态无法被调度。同时使用集群自动伸缩（ClusterAutoscaler）可以一定程度上解决这个问题。
多个VPA同时匹配同一个Pod会造成未定义的行为。
安装vertical-pod-autoscaler
通过以下命令创建RBAC权限文件。
kubectl apply -f rbac.yaml展开查看YAML文件
apiVersion: rbac.authorization.k8s.io/v1 kind: ClusterRole metadata: name: system:metrics-reader rules: - apiGroups: - "metrics.k8s.io" resources: - pods verbs: - get - list --- apiVersion: rbac.authorization.k8s.io/v1 kind: ClusterRole metadata: name: system:vpa-actor rules: - apiGroups: - "" resources: - pods - nodes - limitranges verbs: - get - list - watch - apiGroups: - "" resources: - events verbs: - get - list - watch - create - apiGroups: - "poc.autoscaling.k8s.io" resources: - verticalpodautoscalers verbs: - get - list - watch - patch - apiGroups: - "autoscaling.k8s.io" resources: - verticalpodautoscalers verbs: - get - list - watch - patch --- apiVersion: rbac.authorization.k8s.io/v1 kind: ClusterRole metadata: name: system:vpa-checkpoint-actor rules: - apiGroups: - "poc.autoscaling.k8s.io" resources: - verticalpodautoscalercheckpoints verbs: - get - list - watch - create - patch - delete - apiGroups: - "autoscaling.k8s.io" resources: - verticalpodautoscalercheckpoints verbs: - get - list - watch - create - patch - delete - apiGroups: - "" resources: - namespaces verbs: - get - list --- apiVersion: rbac.authorization.k8s.io/v1 kind: ClusterRole metadata: name: system:evictioner rules: - apiGroups: - "apps" - "extensions" resources: - replicasets verbs: - get - apiGroups: - "" resources: - pods/eviction verbs: - create --- apiVersion: rbac.authorization.k8s.io/v1 kind: ClusterRoleBinding metadata: name: system:metrics-reader roleRef: apiGroup: rbac.authorization.k8s.io kind: ClusterRole name: system:metrics-reader subjects: - kind: ServiceAccount name: vpa-recommender namespace: kube-system --- apiVersion: rbac.authorization.k8s.io/v1 kind: ClusterRoleBinding metadata: name: system:vpa-actor roleRef: apiGroup: rbac.authorization.k8s.io kind: ClusterRole name: system:vpa-actor subjects: - kind: ServiceAccount name: vpa-recommender namespace: kube-system - kind: ServiceAccount name: vpa-updater namespace: kube-system --- apiVersion: rbac.authorization.k8s.io/v1 kind: ClusterRoleBinding metadata: name: system:vpa-checkpoint-actor roleRef: apiGroup: rbac.authorization.k8s.io kind: ClusterRole name: system:vpa-checkpoint-actor subjects: - kind: ServiceAccount name: vpa-recommender namespace: kube-system --- apiVersion: rbac.authorization.k8s.io/v1 kind: ClusterRole metadata: name: system:vpa-target-reader rules: - apiGroups: - '*' resources: - '*/scale' verbs: - get - watch - apiGroups: - "" resources: - replicationcontrollers verbs: - get - list - watch - apiGroups: - apps resources: - daemonsets - deployments - replicasets - statefulsets verbs: - get - list - watch - apiGroups: - batch resources: - jobs - cronjobs verbs: - get - list - watch --- apiVersion: rbac.authorization.k8s.io/v1 kind: ClusterRoleBinding metadata: name: system:vpa-target-reader-binding roleRef: apiGroup: rbac.authorization.k8s.io kind: ClusterRole name: system:vpa-target-reader subjects: - kind: ServiceAccount name: vpa-recommender namespace: kube-system - kind: ServiceAccount name: vpa-admission-controller namespace: kube-system - kind: ServiceAccount name: vpa-updater namespace: kube-system --- apiVersion: rbac.authorization.k8s.io/v1 kind: ClusterRoleBinding metadata: name: system:vpa-evictioner-binding roleRef: apiGroup: rbac.authorization.k8s.io kind: ClusterRole name: system:evictioner subjects: - kind: ServiceAccount name: vpa-updater namespace: kube-system --- apiVersion: v1 kind: ServiceAccount metadata: name: vpa-admission-controller namespace: kube-system --- apiVersion: v1 kind: ServiceAccount metadata: name: vpa-recommender namespace: kube-system --- apiVersion: v1 kind: ServiceAccount metadata: name: vpa-updater namespace: kube-system --- apiVersion: rbac.authorization.k8s.io/v1 kind: ClusterRole metadata: name: system:vpa-admission-controller rules: - apiGroups: - "" resources: - pods - configmaps - nodes - limitranges verbs: - get - list - watch - apiGroups: - "admissionregistration.k8s.io" resources: - mutatingwebhookconfigurations verbs: - create - delete - get - list - apiGroups: - "poc.autoscaling.k8s.io" resources: - verticalpodautoscalers verbs: - get - list - watch - apiGroups: - "autoscaling.k8s.io" resources: - verticalpodautoscalers verbs: - get - list - watch - apiGroups: - "coordination.k8s.io" resources: - leases verbs: - create - update - get - list - watch --- apiVersion: rbac.authorization.k8s.io/v1 kind: ClusterRoleBinding metadata: name: system:vpa-admission-controller roleRef: apiGroup: rbac.authorization.k8s.io kind: ClusterRole name: system:vpa-admission-controller subjects: - kind: ServiceAccount name: vpa-admission-controller namespace: kube-system --- apiVersion: rbac.authorization.k8s.io/v1 kind: ClusterRole metadata: name: system:vpa-status-reader rules: - apiGroups: - "coordination.k8s.io" resources: - leases verbs: - get - list - watch --- apiVersion: rbac.authorization.k8s.io/v1 kind: ClusterRoleBinding metadata: name: system:vpa-status-reader-binding roleRef: apiGroup: rbac.authorization.k8s.io kind: ClusterRole name: system:vpa-status-reader subjects: - kind: ServiceAccount name: vpa-updater namespace: kube-system通过以下命令创建vertical-pod-autoscaler的CRD。
CRD可以提高Kubernetes的扩展能力，详情请参见Extend the Kubernetes API with CustomResourceDefinitions。
kubectl apply -f crd.yaml集群版本＜1.22的crd.yaml定义
apiVersion: apiextensions.k8s.io/v1beta1 kind: CustomResourceDefinition metadata: name: verticalpodautoscalers.autoscaling.k8s.io annotations: "api-approved.kubernetes.io": "https://github.com/kubernetes/kubernetes/pull/63797" spec: group: autoscaling.k8s.io scope: Namespaced names: plural: verticalpodautoscalers singular: verticalpodautoscaler kind: VerticalPodAutoscaler shortNames: - vpa version: v1beta1 versions: - name: v1beta1 served: false storage: false - name: v1beta2 served: true storage: true - name: v1 served: true storage: false validation: # openAPIV3Schema is the schema for validating custom objects. openAPIV3Schema: type: object properties: spec: type: object required: [] properties: targetRef: type: object updatePolicy: type: object properties: updateMode: type: string resourcePolicy: type: object properties: containerPolicies: type: array items: type: object properties: containerName: type: string controlledValues: type: string enum: ["RequestsAndLimits", "RequestsOnly"] mode: type: string enum: ["Auto", "Off"] minAllowed: type: object maxAllowed: type: object controlledResources: type: array items: type: string enum: ["cpu", "memory"] --- apiVersion: apiextensions.k8s.io/v1beta1 kind: CustomResourceDefinition metadata: name: verticalpodautoscalercheckpoints.autoscaling.k8s.io annotations: "api-approved.kubernetes.io": "https://github.com/kubernetes/kubernetes/pull/63797" spec: group: autoscaling.k8s.io scope: Namespaced names: plural: verticalpodautoscalercheckpoints singular: verticalpodautoscalercheckpoint kind: VerticalPodAutoscalerCheckpoint shortNames: - vpacheckpoint version: v1beta1 versions: - name: v1beta1 served: false storage: false - name: v1beta2 served: true storage: true - name: v1 served: true storage: false集群版本≥1.22的crd.yaml定义
apiVersion: apiextensions.k8s.io/v1 kind: CustomResourceDefinition metadata: annotations: api-approved.kubernetes.io: https://github.com/kubernetes/kubernetes/pull/63797 controller-gen.kubebuilder.io/version: v0.9.2 creationTimestamp: null name: verticalpodautoscalercheckpoints.autoscaling.k8s.io spec: group: autoscaling.k8s.io names: kind: VerticalPodAutoscalerCheckpoint listKind: VerticalPodAutoscalerCheckpointList plural: verticalpodautoscalercheckpoints shortNames: - vpacheckpoint singular: verticalpodautoscalercheckpoint scope: Namespaced versions: - name: v1 schema: openAPIV3Schema: description: VerticalPodAutoscalerCheckpoint is the checkpoint of the internal state of VPA that is used for recovery after recommender's restart. properties: apiVersion: description: 'APIVersion defines the versioned schema of this representation of an object. Servers should convert recognized schemas to the latest internal value, and may reject unrecognized values. More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#resources' type: string kind: description: 'Kind is a string value representing the REST resource this object represents. Servers may infer this from the endpoint the client submits requests to. Cannot be updated. In CamelCase. More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#types-kinds' type: string metadata: type: object spec: description: 'Specification of the checkpoint. More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#spec-and-status.' properties: containerName: description: Name of the checkpointed container. type: string vpaObjectName: description: Name of the VPA object that stored VerticalPodAutoscalerCheckpoint object. type: string type: object status: description: Data of the checkpoint. properties: cpuHistogram: description: Checkpoint of histogram for consumption of CPU. properties: bucketWeights: description: Map from bucket index to bucket weight. type: object x-kubernetes-preserve-unknown-fields: true referenceTimestamp: description: Reference timestamp for samples collected within this histogram. format: date-time nullable: true type: string totalWeight: description: Sum of samples to be used as denominator for weights from BucketWeights. type: number type: object firstSampleStart: description: Timestamp of the fist sample from the histograms. format: date-time nullable: true type: string lastSampleStart: description: Timestamp of the last sample from the histograms. format: date-time nullable: true type: string lastUpdateTime: description: The time when the status was last refreshed. format: date-time nullable: true type: string memoryHistogram: description: Checkpoint of histogram for consumption of memory. properties: bucketWeights: description: Map from bucket index to bucket weight. type: object x-kubernetes-preserve-unknown-fields: true referenceTimestamp: description: Reference timestamp for samples collected within this histogram. format: date-time nullable: true type: string totalWeight: description: Sum of samples to be used as denominator for weights from BucketWeights. type: number type: object totalSamplesCount: description: Total number of samples in the histograms. type: integer version: description: Version of the format of the stored data. type: string type: object type: object served: true storage: true - name: v1beta2 schema: openAPIV3Schema: description: VerticalPodAutoscalerCheckpoint is the checkpoint of the internal state of VPA that is used for recovery after recommender's restart. properties: apiVersion: description: 'APIVersion defines the versioned schema of this representation of an object. Servers should convert recognized schemas to the latest internal value, and may reject unrecognized values. More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#resources' type: string kind: description: 'Kind is a string value representing the REST resource this object represents. Servers may infer this from the endpoint the client submits requests to. Cannot be updated. In CamelCase. More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#types-kinds' type: string metadata: type: object spec: description: 'Specification of the checkpoint. More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#spec-and-status.' properties: containerName: description: Name of the checkpointed container. type: string vpaObjectName: description: Name of the VPA object that stored VerticalPodAutoscalerCheckpoint object. type: string type: object status: description: Data of the checkpoint. properties: cpuHistogram: description: Checkpoint of histogram for consumption of CPU. properties: bucketWeights: description: Map from bucket index to bucket weight. type: object x-kubernetes-preserve-unknown-fields: true referenceTimestamp: description: Reference timestamp for samples collected within this histogram. format: date-time nullable: true type: string totalWeight: description: Sum of samples to be used as denominator for weights from BucketWeights. type: number type: object firstSampleStart: description: Timestamp of the fist sample from the histograms. format: date-time nullable: true type: string lastSampleStart: description: Timestamp of the last sample from the histograms. format: date-time nullable: true type: string lastUpdateTime: description: The time when the status was last refreshed. format: date-time nullable: true type: string memoryHistogram: description: Checkpoint of histogram for consumption of memory. properties: bucketWeights: description: Map from bucket index to bucket weight. type: object x-kubernetes-preserve-unknown-fields: true referenceTimestamp: description: Reference timestamp for samples collected within this histogram. format: date-time nullable: true type: string totalWeight: description: Sum of samples to be used as denominator for weights from BucketWeights. type: number type: object totalSamplesCount: description: Total number of samples in the histograms. type: integer version: description: Version of the format of the stored data. type: string type: object type: object served: true storage: false --- apiVersion: apiextensions.k8s.io/v1 kind: CustomResourceDefinition metadata: annotations: api-approved.kubernetes.io: https://github.com/kubernetes/kubernetes/pull/63797 controller-gen.kubebuilder.io/version: v0.9.2 creationTimestamp: null name: verticalpodautoscalers.autoscaling.k8s.io spec: group: autoscaling.k8s.io names: kind: VerticalPodAutoscaler listKind: VerticalPodAutoscalerList plural: verticalpodautoscalers shortNames: - vpa singular: verticalpodautoscaler scope: Namespaced versions: - additionalPrinterColumns: - jsonPath: .spec.updatePolicy.updateMode name: Mode type: string - jsonPath: .status.recommendation.containerRecommendations[0].target.cpu name: CPU type: string - jsonPath: .status.recommendation.containerRecommendations[0].target.memory name: Mem type: string - jsonPath: .status.conditions[?(@.type=='RecommendationProvided')].status name: Provided type: string - jsonPath: .metadata.creationTimestamp name: Age type: date name: v1 schema: openAPIV3Schema: description: VerticalPodAutoscaler is the configuration for a vertical pod autoscaler, which automatically manages pod resources based on historical and real time resource utilization. properties: apiVersion: description: 'APIVersion defines the versioned schema of this representation of an object. Servers should convert recognized schemas to the latest internal value, and may reject unrecognized values. More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#resources' type: string kind: description: 'Kind is a string value representing the REST resource this object represents. Servers may infer this from the endpoint the client submits requests to. Cannot be updated. In CamelCase. More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#types-kinds' type: string metadata: type: object spec: description: 'Specification of the behavior of the autoscaler. More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#spec-and-status.' properties: recommenders: description: Recommender responsible for generating recommendation for this object. List should be empty (then the default recommender will generate the recommendation) or contain exactly one recommender. items: description: VerticalPodAutoscalerRecommenderSelector points to a specific Vertical Pod Autoscaler recommender. In the future it might pass parameters to the recommender. properties: name: description: Name of the recommender responsible for generating recommendation for this object. type: string required: - name type: object type: array resourcePolicy: description: Controls how the autoscaler computes recommended resources. The resource policy may be used to set constraints on the recommendations for individual containers. If not specified, the autoscaler computes recommended resources for all containers in the pod, without additional constraints. properties: containerPolicies: description: Per-container resource policies. items: description: ContainerResourcePolicy controls how autoscaler computes the recommended resources for a specific container. properties: containerName: description: Name of the container or DefaultContainerResourcePolicy, in which case the policy is used by the containers that don't have their own policy specified. type: string controlledResources: description: Specifies the type of recommendations that will be computed (and possibly applied) by VPA. If not specified, the default of [ResourceCPU, ResourceMemory] will be used. items: description: ResourceName is the name identifying various resources in a ResourceList. type: string type: array controlledValues: description: Specifies which resource values should be controlled. The default is "RequestsAndLimits". enum: - RequestsAndLimits - RequestsOnly type: string maxAllowed: additionalProperties: anyOf: - type: integer - type: string pattern: ^(\+|-)?(([0-9]+(\.[0-9]*)?)|(\.[0-9]+))(([KMGTPE]i)|[numkMGTPE]|([eE](\+|-)?(([0-9]+(\.[0-9]*)?)|(\.[0-9]+))))?$ x-kubernetes-int-or-string: true description: Specifies the maximum amount of resources that will be recommended for the container. The default is no maximum. type: object minAllowed: additionalProperties: anyOf: - type: integer - type: string pattern: ^(\+|-)?(([0-9]+(\.[0-9]*)?)|(\.[0-9]+))(([KMGTPE]i)|[numkMGTPE]|([eE](\+|-)?(([0-9]+(\.[0-9]*)?)|(\.[0-9]+))))?$ x-kubernetes-int-or-string: true description: Specifies the minimal amount of resources that will be recommended for the container. The default is no minimum. type: object mode: description: Whether autoscaler is enabled for the container. The default is "Auto". enum: - Auto - "Off" type: string type: object type: array type: object targetRef: description: TargetRef points to the controller managing the set of pods for the autoscaler to control - e.g. Deployment, StatefulSet. VerticalPodAutoscaler can be targeted at controller implementing scale subresource (the pod set is retrieved from the controller's ScaleStatus) or some well known controllers (e.g. for DaemonSet the pod set is read from the controller's spec). If VerticalPodAutoscaler cannot use specified target it will report ConfigUnsupported condition. Note that VerticalPodAutoscaler does not require full implementation of scale subresource - it will not use it to modify the replica count. The only thing retrieved is a label selector matching pods grouped by the target resource. properties: apiVersion: description: API version of the referent type: string kind: description: 'Kind of the referent; More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#types-kinds"' type: string name: description: 'Name of the referent; More info: http://kubernetes.io/docs/user-guide/identifiers#names' type: string required: - kind - name type: object x-kubernetes-map-type: atomic updatePolicy: description: Describes the rules on how changes are applied to the pods. If not specified, all fields in the `PodUpdatePolicy` are set to their default values. properties: minReplicas: description: Minimal number of replicas which need to be alive for Updater to attempt pod eviction (pending other checks like PDB). Only positive values are allowed. Overrides global '--min-replicas' flag. format: int32 type: integer updateMode: description: Controls when autoscaler applies changes to the pod resources. The default is 'Auto'. enum: - "Off" - Initial - Recreate - Auto type: string type: object required: - targetRef type: object status: description: Current information about the autoscaler. properties: conditions: description: Conditions is the set of conditions required for this autoscaler to scale its target, and indicates whether or not those conditions are met. items: description: VerticalPodAutoscalerCondition describes the state of a VerticalPodAutoscaler at a certain point. properties: lastTransitionTime: description: lastTransitionTime is the last time the condition transitioned from one status to another format: date-time type: string message: description: message is a human-readable explanation containing details about the transition type: string reason: description: reason is the reason for the condition's last transition. type: string status: description: status is the status of the condition (True, False, Unknown) type: string type: description: type describes the current condition type: string required: - status - type type: object type: array recommendation: description: The most recently computed amount of resources recommended by the autoscaler for the controlled pods. properties: containerRecommendations: description: Resources recommended by the autoscaler for each container. items: description: RecommendedContainerResources is the recommendation of resources computed by autoscaler for a specific container. Respects the container resource policy if present in the spec. In particular the recommendation is not produced for containers with `ContainerScalingMode` set to 'Off'. properties: containerName: description: Name of the container. type: string lowerBound: additionalProperties: anyOf: - type: integer - type: string pattern: ^(\+|-)?(([0-9]+(\.[0-9]*)?)|(\.[0-9]+))(([KMGTPE]i)|[numkMGTPE]|([eE](\+|-)?(([0-9]+(\.[0-9]*)?)|(\.[0-9]+))))?$ x-kubernetes-int-or-string: true description: Minimum recommended amount of resources. Observes ContainerResourcePolicy. This amount is not guaranteed to be sufficient for the application to operate in a stable way, however running with less resources is likely to have significant impact on performance/availability. type: object target: additionalProperties: anyOf: - type: integer - type: string pattern: ^(\+|-)?(([0-9]+(\.[0-9]*)?)|(\.[0-9]+))(([KMGTPE]i)|[numkMGTPE]|([eE](\+|-)?(([0-9]+(\.[0-9]*)?)|(\.[0-9]+))))?$ x-kubernetes-int-or-string: true description: Recommended amount of resources. Observes ContainerResourcePolicy. type: object uncappedTarget: additionalProperties: anyOf: - type: integer - type: string pattern: ^(\+|-)?(([0-9]+(\.[0-9]*)?)|(\.[0-9]+))(([KMGTPE]i)|[numkMGTPE]|([eE](\+|-)?(([0-9]+(\.[0-9]*)?)|(\.[0-9]+))))?$ x-kubernetes-int-or-string: true description: The most recent recommended resources target computed by the autoscaler for the controlled pods, based only on actual resource usage, not taking into account the ContainerResourcePolicy. May differ from the Recommendation if the actual resource usage causes the target to violate the ContainerResourcePolicy (lower than MinAllowed or higher that MaxAllowed). Used only as status indication, will not affect actual resource assignment. type: object upperBound: additionalProperties: anyOf: - type: integer - type: string pattern: ^(\+|-)?(([0-9]+(\.[0-9]*)?)|(\.[0-9]+))(([KMGTPE]i)|[numkMGTPE]|([eE](\+|-)?(([0-9]+(\.[0-9]*)?)|(\.[0-9]+))))?$ x-kubernetes-int-or-string: true description: Maximum recommended amount of resources. Observes ContainerResourcePolicy. Any resources allocated beyond this value are likely wasted. This value may be larger than the maximum amount of application is actually capable of consuming. type: object required: - target type: object type: array type: object type: object required: - spec type: object served: true storage: true subresources: {} - deprecated: true deprecationWarning: autoscaling.k8s.io/v1beta2 API is deprecated name: v1beta2 schema: openAPIV3Schema: description: VerticalPodAutoscaler is the configuration for a vertical pod autoscaler, which automatically manages pod resources based on historical and real time resource utilization. properties: apiVersion: description: 'APIVersion defines the versioned schema of this representation of an object. Servers should convert recognized schemas to the latest internal value, and may reject unrecognized values. More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#resources' type: string kind: description: 'Kind is a string value representing the REST resource this object represents. Servers may infer this from the endpoint the client submits requests to. Cannot be updated. In CamelCase. More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#types-kinds' type: string metadata: type: object spec: description: 'Specification of the behavior of the autoscaler. More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#spec-and-status.' properties: resourcePolicy: description: Controls how the autoscaler computes recommended resources. The resource policy may be used to set constraints on the recommendations for individual containers. If not specified, the autoscaler computes recommended resources for all containers in the pod, without additional constraints. properties: containerPolicies: description: Per-container resource policies. items: description: ContainerResourcePolicy controls how autoscaler computes the recommended resources for a specific container. properties: containerName: description: Name of the container or DefaultContainerResourcePolicy, in which case the policy is used by the containers that don't have their own policy specified. type: string maxAllowed: additionalProperties: anyOf: - type: integer - type: string pattern: ^(\+|-)?(([0-9]+(\.[0-9]*)?)|(\.[0-9]+))(([KMGTPE]i)|[numkMGTPE]|([eE](\+|-)?(([0-9]+(\.[0-9]*)?)|(\.[0-9]+))))?$ x-kubernetes-int-or-string: true description: Specifies the maximum amount of resources that will be recommended for the container. The default is no maximum. type: object minAllowed: additionalProperties: anyOf: - type: integer - type: string pattern: ^(\+|-)?(([0-9]+(\.[0-9]*)?)|(\.[0-9]+))(([KMGTPE]i)|[numkMGTPE]|([eE](\+|-)?(([0-9]+(\.[0-9]*)?)|(\.[0-9]+))))?$ x-kubernetes-int-or-string: true description: Specifies the minimal amount of resources that will be recommended for the container. The default is no minimum. type: object mode: description: Whether autoscaler is enabled for the container. The default is "Auto". enum: - Auto - "Off" type: string type: object type: array type: object targetRef: description: TargetRef points to the controller managing the set of pods for the autoscaler to control - e.g. Deployment, StatefulSet. VerticalPodAutoscaler can be targeted at controller implementing scale subresource (the pod set is retrieved from the controller's ScaleStatus) or some well known controllers (e.g. for DaemonSet the pod set is read from the controller's spec). If VerticalPodAutoscaler cannot use specified target it will report ConfigUnsupported condition. Note that VerticalPodAutoscaler does not require full implementation of scale subresource - it will not use it to modify the replica count. The only thing retrieved is a label selector matching pods grouped by the target resource. properties: apiVersion: description: API version of the referent type: string kind: description: 'Kind of the referent; More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#types-kinds"' type: string name: description: 'Name of the referent; More info: http://kubernetes.io/docs/user-guide/identifiers#names' type: string required: - kind - name type: object x-kubernetes-map-type: atomic updatePolicy: description: Describes the rules on how changes are applied to the pods. If not specified, all fields in the `PodUpdatePolicy` are set to their default values. properties: updateMode: description: Controls when autoscaler applies changes to the pod resources. The default is 'Auto'. enum: - "Off" - Initial - Recreate - Auto type: string type: object required: - targetRef type: object status: description: Current information about the autoscaler. properties: conditions: description: Conditions is the set of conditions required for this autoscaler to scale its target, and indicates whether or not those conditions are met. items: description: VerticalPodAutoscalerCondition describes the state of a VerticalPodAutoscaler at a certain point. properties: lastTransitionTime: description: lastTransitionTime is the last time the condition transitioned from one status to another format: date-time type: string message: description: message is a human-readable explanation containing details about the transition type: string reason: description: reason is the reason for the condition's last transition. type: string status: description: status is the status of the condition (True, False, Unknown) type: string type: description: type describes the current condition type: string required: - status - type type: object type: array recommendation: description: The most recently computed amount of resources recommended by the autoscaler for the controlled pods. properties: containerRecommendations: description: Resources recommended by the autoscaler for each container. items: description: RecommendedContainerResources is the recommendation of resources computed by autoscaler for a specific container. Respects the container resource policy if present in the spec. In particular the recommendation is not produced for containers with `ContainerScalingMode` set to 'Off'. properties: containerName: description: Name of the container. type: string lowerBound: additionalProperties: anyOf: - type: integer - type: string pattern: ^(\+|-)?(([0-9]+(\.[0-9]*)?)|(\.[0-9]+))(([KMGTPE]i)|[numkMGTPE]|([eE](\+|-)?(([0-9]+(\.[0-9]*)?)|(\.[0-9]+))))?$ x-kubernetes-int-or-string: true description: Minimum recommended amount of resources. Observes ContainerResourcePolicy. This amount is not guaranteed to be sufficient for the application to operate in a stable way, however running with less resources is likely to have significant impact on performance/availability. type: object target: additionalProperties: anyOf: - type: integer - type: string pattern: ^(\+|-)?(([0-9]+(\.[0-9]*)?)|(\.[0-9]+))(([KMGTPE]i)|[numkMGTPE]|([eE](\+|-)?(([0-9]+(\.[0-9]*)?)|(\.[0-9]+))))?$ x-kubernetes-int-or-string: true description: Recommended amount of resources. Observes ContainerResourcePolicy. type: object uncappedTarget: additionalProperties: anyOf: - type: integer - type: string pattern: ^(\+|-)?(([0-9]+(\.[0-9]*)?)|(\.[0-9]+))(([KMGTPE]i)|[numkMGTPE]|([eE](\+|-)?(([0-9]+(\.[0-9]*)?)|(\.[0-9]+))))?$ x-kubernetes-int-or-string: true description: The most recent recommended resources target computed by the autoscaler for the controlled pods, based only on actual resource usage, not taking into account the ContainerResourcePolicy. May differ from the Recommendation if the actual resource usage causes the target to violate the ContainerResourcePolicy (lower than MinAllowed or higher that MaxAllowed). Used only as status indication, will not affect actual resource assignment. type: object upperBound: additionalProperties: anyOf: - type: integer - type: string pattern: ^(\+|-)?(([0-9]+(\.[0-9]*)?)|(\.[0-9]+))(([KMGTPE]i)|[numkMGTPE]|([eE](\+|-)?(([0-9]+(\.[0-9]*)?)|(\.[0-9]+))))?$ x-kubernetes-int-or-string: true description: Maximum recommended amount of resources. Observes ContainerResourcePolicy. Any resources allocated beyond this value are likely wasted. This value may be larger than the maximum amount of application is actually capable of consuming. type: object required: - target type: object type: array type: object type: object required: - spec type: object served: true storage: false安装vertical-pod-autoscaler的组件。
vertical-pod-autoscaler的组件包括：admission-controller、recommender、updater。
说明安装admission-controller组件前，您需要用此脚本为Webhook生成证书。
集群版本＜1.22的YAML定义
安装admission-controller组件
apiVersion: apps/v1 kind: Deployment metadata: name: vpa-admission-controller namespace: kube-system spec: replicas: 1 selector: matchLabels: app: vpa-admission-controller template: metadata: labels: app: vpa-admission-controller spec: serviceAccountName: admin containers: - name: admission-controller image: registry.cn-hangzhou.aliyuncs.com/acs/vpa-admission-controller:0.7.0 imagePullPolicy: Always env: - name: NAMESPACE valueFrom: fieldRef: fieldPath: metadata.namespace volumeMounts: - name: tls-certs mountPath: "/etc/tls-certs" readOnly: true resources: limits: cpu: 200m memory: 500Mi requests: cpu: 50m memory: 200Mi ports: - containerPort: 8000 volumes: - name: tls-certs secret: secretName: vpa-tls-certs --- apiVersion: v1 kind: Service metadata: name: vpa-webhook namespace: kube-system spec: ports: - port: 443 targetPort: 8000 selector: app: vpa-admission-controller安装recommender组件
apiVersion: apps/v1 kind: Deployment metadata: name: vpa-recommender namespace: kube-system spec: replicas: 1 selector: matchLabels: app: vpa-recommender template: metadata: labels: app: vpa-recommender spec: serviceAccountName: admin containers: - name: recommender image: registry.cn-hangzhou.aliyuncs.com/acs/vpa-recommender:0.7.0 imagePullPolicy: Always resources: limits: cpu: 200m memory: 1000Mi requests: cpu: 50m memory: 500Mi ports: - containerPort: 8080安装updater组件
apiVersion: apps/v1 kind: Deployment metadata: name: vpa-updater namespace: kube-system spec: replicas: 1 selector: matchLabels: app: vpa-updater template: metadata: labels: app: vpa-updater spec: serviceAccountName: admin containers: - name: updater image: registry.cn-hangzhou.aliyuncs.com/acs/vpa-updater:0.7.0 imagePullPolicy: Always resources: limits: cpu: 200m memory: 1000Mi requests: cpu: 50m memory: 500Mi ports: - containerPort: 8080集群版本≥1.22的YAML定义
安装admission-controller组件
apiVersion: apps/v1 kind: Deployment metadata: name: vpa-admission-controller namespace: kube-system spec: replicas: 1 selector: matchLabels: app: vpa-admission-controller template: metadata: labels: app: vpa-admission-controller spec: serviceAccountName: vpa-admission-controller securityContext: runAsNonRoot: true runAsUser: 65534 # nobody containers: - name: admission-controller image: registry.cn-hangzhou.aliyuncs.com/acs/vpa-admission-controller:0.13.0 imagePullPolicy: Always env: - name: NAMESPACE valueFrom: fieldRef: fieldPath: metadata.namespace volumeMounts: - name: tls-certs mountPath: "/etc/tls-certs" readOnly: true resources: limits: cpu: 200m memory: 500Mi requests: cpu: 50m memory: 200Mi ports: - containerPort: 8000 - name: prometheus containerPort: 8944 volumes: - name: tls-certs secret: secretName: vpa-tls-certs --- apiVersion: v1 kind: Service metadata: name: vpa-webhook namespace: kube-system spec: ports: - port: 443 targetPort: 8000 selector: app: vpa-admission-controller安装recommender组件
apiVersion: apps/v1 kind: Deployment metadata: name: vpa-recommender namespace: kube-system spec: replicas: 1 selector: matchLabels: app: vpa-recommender template: metadata: labels: app: vpa-recommender spec: serviceAccountName: vpa-recommender securityContext: runAsNonRoot: true runAsUser: 65534 # nobody containers: - name: recommender image: registry.cn-hangzhou.aliyuncs.com/acs/vpa-recommender:0.13.0 imagePullPolicy: Always resources: limits: cpu: 200m memory: 1000Mi requests: cpu: 50m memory: 500Mi ports: - name: prometheus containerPort: 8942安装updater组件
apiVersion: apps/v1 kind: Deployment metadata: name: vpa-updater namespace: kube-system spec: replicas: 1 selector: matchLabels: app: vpa-updater template: metadata: labels: app: vpa-updater spec: serviceAccountName: vpa-updater securityContext: runAsNonRoot: true runAsUser: 65534 # nobody containers: - name: updater image: registry.cn-hangzhou.aliyuncs.com/acs/vpa-updater:0.13.0 imagePullPolicy: Always env: - name: NAMESPACE valueFrom: fieldRef: fieldPath: metadata.namespace resources: limits: cpu: 200m memory: 1000Mi requests: cpu: 50m memory: 500Mi ports: - name: prometheus containerPort: 8943
验证安装VPA
使用以下YAML定义创建名为nginx-deployment-basic的Deployment和名为nginx-deployment-basic-vpa的VPA资源。
展开查看YAML文件
apiVersion: apps/v1 kind: Deployment metadata: name: nginx-deployment-basic labels: app: nginx spec: replicas: 2 selector: matchLabels: app: nginx template: metadata: labels: app: nginx spec: containers: - name: nginx image: nginx:1.7.9 ports: - containerPort: 80 --- apiVersion: autoscaling.k8s.io/v1 kind: VerticalPodAutoscaler metadata: name: nginx-deployment-basic-vpa spec: targetRef: apiVersion: "apps/v1" kind: Deployment name: nginx-deployment-basic updatePolicy: updateMode: "Off"说明设置updateMode为Off，并且将Deployment中的资源requests和limits留空。
执行以下命令可以查询VPA为Deployment推荐的CPU和内存资源的requests值。
说明执行命令查询VPA为Deployment推荐的CPU和内存资源的requests值时，需要等待两分钟，才能返回结果。
kubectl describe vpa nginx-deployment-basic-vpa执行命令后可以看到以下VPA为Deployment推荐的值。
展开查看内容详情
Recommendation: Container Recommendations: Container Name: nginx Lower Bound: Cpu: 25m Memory: 262144k Target: Cpu: 25m Memory: 262144k Uncapped Target: Cpu: 25m Memory: 262144k Upper Bound: Cpu: 11601m Memory: 12128573170您可以根据推荐值来实际配置Deployment中资源的requests。VPA会持续的监控应用资源的使用情况，并提供优化建议。
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