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Kubernetes控制平面组件：Controller Manager 之 NamespaceController 全方位讲解

news 2025/5/7 11:46:28

云原生学习路线导航页（持续更新中）

  • kubernetes学习系列快捷链接
    • Kubernetes架构原则和对象设计（一）
    • Kubernetes架构原则和对象设计（二）
    • Kubernetes架构原则和对象设计（三）
    • Kubernetes控制平面组件：etcd（一）
    • Kubernetes控制平面组件：etcd（二）
    • Kubernetes控制平面组件：API Server详解（一）
    • Kubernetes控制平面组件：API Server详解（二）
    • Kubernetes控制平面组件：调度器Scheduler（一）
    • Kubernetes控制平面组件：调度器Scheduler（二）
    • Kubernetes控制平面组件：Controller Manager详解
    • Kubernetes控制平面组件：Controller Manager 之 内置Controller详解
    • Kubernetes控制平面组件：Controller Manager 之 NamespaceController 全方位讲解

本文是kubernetes的控制面组件ControllerManager系列文章，本篇 以Namespace Controller 为例，详细讲述了kubernetes内置Controller的编写过程，包含kubernetes 内置controller struct 声明，Informer机制原理及代码分析、client-go Clientset 整合资源client的原理、kube-controller-manager如何启动内置controller等。另外对Namespace Controller 代码进行完整分析

  • 希望大家多多 点赞 关注 评论 收藏，作者会更有动力继续编写技术文章

1.Namespace Struct

kubernetes/staging/src/k8s.io/api/core/v1/types.go

  • 首先定义 namespace struct，包括spec、status等
// FinalizerName is the name identifying a finalizer during namespace lifecycle.
type FinalizerName string// These are internal finalizer values to Kubernetes, must be qualified name unless defined here or
// in metav1.
const (FinalizerKubernetes FinalizerName = "kubernetes"
)// NamespaceSpec describes the attributes on a Namespace.
type NamespaceSpec struct {// Finalizers is an opaque list of values that must be empty to permanently remove object from storage.// More info: https://kubernetes.io/docs/tasks/administer-cluster/namespaces/// +optional// +listType=atomicFinalizers []FinalizerName `json:"finalizers,omitempty" protobuf:"bytes,1,rep,name=finalizers,casttype=FinalizerName"`
}// NamespaceStatus is information about the current status of a Namespace.
type NamespaceStatus struct {// Phase is the current lifecycle phase of the namespace.// More info: https://kubernetes.io/docs/tasks/administer-cluster/namespaces/// +optionalPhase NamespacePhase `json:"phase,omitempty" protobuf:"bytes,1,opt,name=phase,casttype=NamespacePhase"`// Represents the latest available observations of a namespace's current state.// +optional// +patchMergeKey=type// +patchStrategy=merge// +listType=map// +listMapKey=typeConditions []NamespaceCondition `json:"conditions,omitempty" patchStrategy:"merge" patchMergeKey:"type" protobuf:"bytes,2,rep,name=conditions"`
}// +enum
type NamespacePhase string// These are the valid phases of a namespace.
const (// NamespaceActive means the namespace is available for use in the systemNamespaceActive NamespacePhase = "Active"// NamespaceTerminating means the namespace is undergoing graceful terminationNamespaceTerminating NamespacePhase = "Terminating"
)const (// NamespaceTerminatingCause is returned as a defaults.cause item when a change is// forbidden due to the namespace being terminated.NamespaceTerminatingCause metav1.CauseType = "NamespaceTerminating"
)type NamespaceConditionType string// These are built-in conditions of a namespace.
const (// NamespaceDeletionDiscoveryFailure contains information about namespace deleter errors during resource discovery.NamespaceDeletionDiscoveryFailure NamespaceConditionType = "NamespaceDeletionDiscoveryFailure"// NamespaceDeletionContentFailure contains information about namespace deleter errors during deletion of resources.NamespaceDeletionContentFailure NamespaceConditionType = "NamespaceDeletionContentFailure"// NamespaceDeletionGVParsingFailure contains information about namespace deleter errors parsing GV for legacy types.NamespaceDeletionGVParsingFailure NamespaceConditionType = "NamespaceDeletionGroupVersionParsingFailure"// NamespaceContentRemaining contains information about resources remaining in a namespace.NamespaceContentRemaining NamespaceConditionType = "NamespaceContentRemaining"// NamespaceFinalizersRemaining contains information about which finalizers are on resources remaining in a namespace.NamespaceFinalizersRemaining NamespaceConditionType = "NamespaceFinalizersRemaining"
)// NamespaceCondition contains details about state of namespace.
type NamespaceCondition struct {// Type of namespace controller condition.Type NamespaceConditionType `json:"type" protobuf:"bytes,1,opt,name=type,casttype=NamespaceConditionType"`// Status of the condition, one of True, False, Unknown.Status ConditionStatus `json:"status" protobuf:"bytes,2,opt,name=status,casttype=ConditionStatus"`// Last time the condition transitioned from one status to another.// +optionalLastTransitionTime metav1.Time `json:"lastTransitionTime,omitempty" protobuf:"bytes,4,opt,name=lastTransitionTime"`// Unique, one-word, CamelCase reason for the condition's last transition.// +optionalReason string `json:"reason,omitempty" protobuf:"bytes,5,opt,name=reason"`// Human-readable message indicating details about last transition.// +optionalMessage string `json:"message,omitempty" protobuf:"bytes,6,opt,name=message"`
}// +genclient
// +genclient:nonNamespaced
// +genclient:skipVerbs=deleteCollection
// +k8s:deepcopy-gen:interfaces=k8s.io/apimachinery/pkg/runtime.Object
// +k8s:prerelease-lifecycle-gen:introduced=1.0// Namespace provides a scope for Names.
// Use of multiple namespaces is optional.
type Namespace struct {metav1.TypeMeta `json:",inline"`// Standard object's metadata.// More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#metadata// +optionalmetav1.ObjectMeta `json:"metadata,omitempty" protobuf:"bytes,1,opt,name=metadata"`// Spec defines the behavior of the Namespace.// More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#spec-and-status// +optionalSpec NamespaceSpec `json:"spec,omitempty" protobuf:"bytes,2,opt,name=spec"`// Status describes the current status of a Namespace.// More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#spec-and-status// +optionalStatus NamespaceStatus `json:"status,omitempty" protobuf:"bytes,3,opt,name=status"`
}// +k8s:deepcopy-gen:interfaces=k8s.io/apimachinery/pkg/runtime.Object
// +k8s:prerelease-lifecycle-gen:introduced=1.0// NamespaceList is a list of Namespaces.
type NamespaceList struct {metav1.TypeMeta `json:",inline"`// Standard list metadata.// More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#types-kinds// +optionalmetav1.ListMeta `json:"metadata,omitempty" protobuf:"bytes,1,opt,name=metadata"`// Items is the list of Namespace objects in the list.// More info: https://kubernetes.io/docs/concepts/overview/working-with-objects/namespaces/Items []Namespace `json:"items" protobuf:"bytes,2,rep,name=items"`
}
  • 代码中涉及的注释tag：
注释标签功能描述生成内容/行为
// +enum标记类型为枚举类型生成枚举类型代码，如 NamespacePhase 的 Active 和 Terminating 枚举值
// +genclient声明需要生成客户端代码生成资源的 CRUD 客户端方法（如 Create、Update、Delete）
// +genclient:nonNamespaced标记资源为集群范围（非命名空间内资源）生成的客户端方法不包含命名空间参数（如 Namespace 资源）
// +genclient:skipVerbs=deleteCollection跳过生成指定动词的客户端方法不生成 DeleteCollection 方法（避免批量删除操作）
// +k8s:deepcopy-gen:interfaces=...启用深拷贝并实现指定接口生成实现 runtime.Object 接口的 DeepCopy() 方法，支持序列化和反序列化
// +k8s:prerelease-lifecycle-gen:introduced=1.0标记 API 资源的版本生命周期阶段记录 API 的版本演进（如该资源在 1.0 版本引入）
// +optional标记字段为可选字段生成的 OpenAPI Schema 中该字段非必填，JSON 编码时忽略空值
// +listType=atomic指定列表字段为原子性合并策略列表字段在更新时会被整体替换（而非合并）
// +listType=map指定列表字段为映射合并策略列表字段按 listMapKey 指定的键进行合并（如 type）
// +listMapKey=type定义列表合并的主键字段生成基于 type 字段的合并逻辑（用于 Conditions 等字段）
// +patchMergeKey=type定义补丁操作时的合并键指定 type 字段为合并条件（与 patchStrategy=merge 配合使用）
// +patchStrategy=merge指定补丁操作为合并策略字段更新时根据 patchMergeKey 合并而非覆盖

  • 分类说明

  • 代码生成类

  • // +genclient、// +enum、// +k8s:deepcopy-gen 等用于控制代码生成逻辑。

  • 例如：生成客户端方法、深拷贝方法、枚举类型代码。

  • 字段行为类

  • // +optional、// +listType=atomic、// +patchStrategy=merge 等定义字段的序列化、更新和合并行为。

  • 例如：Conditions 字段通过 listType=map 和 listMapKey=type 实现按类型合并。

  • API 生命周期类

  • // +k8s:prerelease-lifecycle-gen 标记 API 版本状态（如 Alpha、Beta、Stable）。

  • 例如：Namespace 和 NamespaceList 均标记为 1.0 版本引入。

  • 核心场景示例

  • Finalizer 机制：

  • NamespaceSpec 中的 Finalizers 字段通过 // +listType=atomic 确保在删除命名空间时，Finalizer 列表的更新是原子性的。

  • 状态条件管理：

  • NamespaceStatus.Conditions 通过 // +listType=map 和 // +listMapKey=type 实现按条件类型（如 NamespaceDeletionFailure）合并状态信息。

  • 资源删除保护：

  • FinalizerKubernetes 常量标记内置 Finalizer，防止命名空间被直接删除，需等待关联资源清理完成。

2.Namespace register

kubernetes/staging/src/k8s.io/api/core/v1/register.go

package v1import (metav1 "k8s.io/apimachinery/pkg/apis/meta/v1""k8s.io/apimachinery/pkg/runtime""k8s.io/apimachinery/pkg/runtime/schema"
)// GroupName is the group name use in this package
const GroupName = ""// SchemeGroupVersion is group version used to register these objects
var SchemeGroupVersion = schema.GroupVersion{Group: GroupName, Version: "v1"}// Resource takes an unqualified resource and returns a Group qualified GroupResource
func Resource(resource string) schema.GroupResource {return SchemeGroupVersion.WithResource(resource).GroupResource()
}var (// We only register manually written functions here. The registration of the// generated functions takes place in the generated files. The separation// makes the code compile even when the generated files are missing.SchemeBuilder = runtime.NewSchemeBuilder(addKnownTypes)AddToScheme   = SchemeBuilder.AddToScheme
)// Adds the list of known types to the given scheme.
func addKnownTypes(scheme *runtime.Scheme) error {scheme.AddKnownTypes(SchemeGroupVersion,...&Namespace{},&NamespaceList{},...)// Add common typesscheme.AddKnownTypes(SchemeGroupVersion, &metav1.Status{})// Add the watch version that appliesmetav1.AddToGroupVersion(scheme, SchemeGroupVersion)return nil
}

3.Namespace 代码生成器生成代码

3.1.zz_generated.deepcopy.go

kubernetes/staging/src/k8s.io/api/core/v1/zz_generated.deepcopy.go

  • zz_generated.deepcopy 代码在 api 项目中维护
// DeepCopyInto is an autogenerated deepcopy function, copying the receiver, writing into out. in must be non-nil.
func (in *Namespace) DeepCopyInto(out *Namespace) {*out = *inout.TypeMeta = in.TypeMetain.ObjectMeta.DeepCopyInto(&out.ObjectMeta)in.Spec.DeepCopyInto(&out.Spec)in.Status.DeepCopyInto(&out.Status)return
}// DeepCopy is an autogenerated deepcopy function, copying the receiver, creating a new Namespace.
func (in *Namespace) DeepCopy() *Namespace {if in == nil {return nil}out := new(Namespace)in.DeepCopyInto(out)return out
}// DeepCopyObject is an autogenerated deepcopy function, copying the receiver, creating a new runtime.Object.
func (in *Namespace) DeepCopyObject() runtime.Object {if c := in.DeepCopy(); c != nil {return c}return nil
}// DeepCopyInto is an autogenerated deepcopy function, copying the receiver, writing into out. in must be non-nil.
func (in *NamespaceCondition) DeepCopyInto(out *NamespaceCondition) {*out = *inin.LastTransitionTime.DeepCopyInto(&out.LastTransitionTime)return
}// DeepCopy is an autogenerated deepcopy function, copying the receiver, creating a new NamespaceCondition.
func (in *NamespaceCondition) DeepCopy() *NamespaceCondition {if in == nil {return nil}out := new(NamespaceCondition)in.DeepCopyInto(out)return out
}// DeepCopyInto is an autogenerated deepcopy function, copying the receiver, writing into out. in must be non-nil.
func (in *NamespaceList) DeepCopyInto(out *NamespaceList) {*out = *inout.TypeMeta = in.TypeMetain.ListMeta.DeepCopyInto(&out.ListMeta)if in.Items != nil {in, out := &in.Items, &out.Items*out = make([]Namespace, len(*in))for i := range *in {(*in)[i].DeepCopyInto(&(*out)[i])}}return
}// DeepCopy is an autogenerated deepcopy function, copying the receiver, creating a new NamespaceList.
func (in *NamespaceList) DeepCopy() *NamespaceList {if in == nil {return nil}out := new(NamespaceList)in.DeepCopyInto(out)return out
}// DeepCopyObject is an autogenerated deepcopy function, copying the receiver, creating a new runtime.Object.
func (in *NamespaceList) DeepCopyObject() runtime.Object {if c := in.DeepCopy(); c != nil {return c}return nil
}// DeepCopyInto is an autogenerated deepcopy function, copying the receiver, writing into out. in must be non-nil.
func (in *NamespaceSpec) DeepCopyInto(out *NamespaceSpec) {*out = *inif in.Finalizers != nil {in, out := &in.Finalizers, &out.Finalizers*out = make([]FinalizerName, len(*in))copy(*out, *in)}return
}// DeepCopy is an autogenerated deepcopy function, copying the receiver, creating a new NamespaceSpec.
func (in *NamespaceSpec) DeepCopy() *NamespaceSpec {if in == nil {return nil}out := new(NamespaceSpec)in.DeepCopyInto(out)return out
}// DeepCopyInto is an autogenerated deepcopy function, copying the receiver, writing into out. in must be non-nil.
func (in *NamespaceStatus) DeepCopyInto(out *NamespaceStatus) {*out = *inif in.Conditions != nil {in, out := &in.Conditions, &out.Conditions*out = make([]NamespaceCondition, len(*in))for i := range *in {(*in)[i].DeepCopyInto(&(*out)[i])}}return
}// DeepCopy is an autogenerated deepcopy function, copying the receiver, creating a new NamespaceStatus.
func (in *NamespaceStatus) DeepCopy() *NamespaceStatus {if in == nil {return nil}out := new(NamespaceStatus)in.DeepCopyInto(out)return out
}

3.2.zz_generated.prerelease-lifecycle.go

kubernetes/staging/src/k8s.io/api/core/v1/zz_generated.prerelease-lifecycle.go

  • zz_generated.prerelease-lifecycle 代码在 api 项目中维护
// APILifecycleIntroduced is an autogenerated function, returning the release in which the API struct was introduced as int versions of major and minor for comparison.
// It is controlled by "k8s:prerelease-lifecycle-gen:introduced" tags in types.go.
func (in *Namespace) APILifecycleIntroduced() (major, minor int) {return 1, 0
}// APILifecycleIntroduced is an autogenerated function, returning the release in which the API struct was introduced as int versions of major and minor for comparison.
// It is controlled by "k8s:prerelease-lifecycle-gen:introduced" tags in types.go.
func (in *NamespaceList) APILifecycleIntroduced() (major, minor int) {return 1, 0
}

3.3.types_swagger_doc_generated.go

kubernetes/staging/src/k8s.io/api/core/v1/types_swagger_doc_generated.go

  • types_swagger_doc_generated 代码在 api 项目中维护
var map_Namespace = map[string]string{"":         "Namespace provides a scope for Names. Use of multiple namespaces is optional.","metadata": "Standard object's metadata. More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#metadata","spec":     "Spec defines the behavior of the Namespace. More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#spec-and-status","status":   "Status describes the current status of a Namespace. More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#spec-and-status",
}func (Namespace) SwaggerDoc() map[string]string {return map_Namespace
}var map_NamespaceCondition = map[string]string{"":                   "NamespaceCondition contains details about state of namespace.","type":               "Type of namespace controller condition.","status":             "Status of the condition, one of True, False, Unknown.","lastTransitionTime": "Last time the condition transitioned from one status to another.","reason":             "Unique, one-word, CamelCase reason for the condition's last transition.","message":            "Human-readable message indicating details about last transition.",
}func (NamespaceCondition) SwaggerDoc() map[string]string {return map_NamespaceCondition
}var map_NamespaceList = map[string]string{"":         "NamespaceList is a list of Namespaces.","metadata": "Standard list metadata. More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#types-kinds","items":    "Items is the list of Namespace objects in the list. More info: https://kubernetes.io/docs/concepts/overview/working-with-objects/namespaces/",
}func (NamespaceList) SwaggerDoc() map[string]string {return map_NamespaceList
}var map_NamespaceSpec = map[string]string{"":           "NamespaceSpec describes the attributes on a Namespace.","finalizers": "Finalizers is an opaque list of values that must be empty to permanently remove object from storage. More info: https://kubernetes.io/docs/tasks/administer-cluster/namespaces/",
}func (NamespaceSpec) SwaggerDoc() map[string]string {return map_NamespaceSpec
}var map_NamespaceStatus = map[string]string{"":           "NamespaceStatus is information about the current status of a Namespace.","phase":      "Phase is the current lifecycle phase of the namespace. More info: https://kubernetes.io/docs/tasks/administer-cluster/namespaces/","conditions": "Represents the latest available observations of a namespace's current state.",
}func (NamespaceStatus) SwaggerDoc() map[string]string {return map_NamespaceStatus
}

3.4.generated.proto.go

kubernetes/staging/src/k8s.io/api/core/v1/generated.proto

  • generated.proto 代码在 api 项目中维护
// Namespace provides a scope for Names.
// Use of multiple namespaces is optional.
message Namespace {// Standard object's metadata.// More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#metadata// +optionaloptional .k8s.io.apimachinery.pkg.apis.meta.v1.ObjectMeta metadata = 1;// Spec defines the behavior of the Namespace.// More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#spec-and-status// +optionaloptional NamespaceSpec spec = 2;// Status describes the current status of a Namespace.// More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#spec-and-status// +optionaloptional NamespaceStatus status = 3;
}// NamespaceCondition contains details about state of namespace.
message NamespaceCondition {// Type of namespace controller condition.optional string type = 1;// Status of the condition, one of True, False, Unknown.optional string status = 2;// Last time the condition transitioned from one status to another.// +optionaloptional .k8s.io.apimachinery.pkg.apis.meta.v1.Time lastTransitionTime = 4;// Unique, one-word, CamelCase reason for the condition's last transition.// +optionaloptional string reason = 5;// Human-readable message indicating details about last transition.// +optionaloptional string message = 6;
}// NamespaceList is a list of Namespaces.
message NamespaceList {// Standard list metadata.// More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#types-kinds// +optionaloptional .k8s.io.apimachinery.pkg.apis.meta.v1.ListMeta metadata = 1;// Items is the list of Namespace objects in the list.// More info: https://kubernetes.io/docs/concepts/overview/working-with-objects/namespaces/repeated Namespace items = 2;
}// NamespaceSpec describes the attributes on a Namespace.
message NamespaceSpec {// Finalizers is an opaque list of values that must be empty to permanently remove object from storage.// More info: https://kubernetes.io/docs/tasks/administer-cluster/namespaces/// +optional// +listType=atomicrepeated string finalizers = 1;
}// NamespaceStatus is information about the current status of a Namespace.
message NamespaceStatus {// Phase is the current lifecycle phase of the namespace.// More info: https://kubernetes.io/docs/tasks/administer-cluster/namespaces/// +optionaloptional string phase = 1;// Represents the latest available observations of a namespace's current state.// +optional// +patchMergeKey=type// +patchStrategy=merge// +listType=map// +listMapKey=typerepeated NamespaceCondition conditions = 2;
}

3.5.generated.pb.go

kubernetes/staging/src/k8s.io/api/core/v1/generated.pb.go

  • generated.pb 代码在 api 项目中维护
func (m *Namespace) Reset()      { *m = Namespace{} }
func (*Namespace) ProtoMessage() {}
func (*Namespace) Descriptor() ([]byte, []int) {return fileDescriptor_6c07b07c062484ab, []int{91}
}
func (m *Namespace) XXX_Unmarshal(b []byte) error {return m.Unmarshal(b)
}
func (m *Namespace) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {b = b[:cap(b)]n, err := m.MarshalToSizedBuffer(b)if err != nil {return nil, err}return b[:n], nil
}
func (m *Namespace) XXX_Merge(src proto.Message) {xxx_messageInfo_Namespace.Merge(m, src)
}
func (m *Namespace) XXX_Size() int {return m.Size()
}
func (m *Namespace) XXX_DiscardUnknown() {xxx_messageInfo_Namespace.DiscardUnknown(m)
}var xxx_messageInfo_Namespace proto.InternalMessageInfofunc (m *NamespaceCondition) Reset()      { *m = NamespaceCondition{} }
func (*NamespaceCondition) ProtoMessage() {}
func (*NamespaceCondition) Descriptor() ([]byte, []int) {return fileDescriptor_6c07b07c062484ab, []int{92}
}
func (m *NamespaceCondition) XXX_Unmarshal(b []byte) error {return m.Unmarshal(b)
}
func (m *NamespaceCondition) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {b = b[:cap(b)]n, err := m.MarshalToSizedBuffer(b)if err != nil {return nil, err}return b[:n], nil
}
func (m *NamespaceCondition) XXX_Merge(src proto.Message) {xxx_messageInfo_NamespaceCondition.Merge(m, src)
}
func (m *NamespaceCondition) XXX_Size() int {return m.Size()
}
func (m *NamespaceCondition) XXX_DiscardUnknown() {xxx_messageInfo_NamespaceCondition.DiscardUnknown(m)
}var xxx_messageInfo_NamespaceCondition proto.InternalMessageInfofunc (m *NamespaceList) Reset()      { *m = NamespaceList{} }
func (*NamespaceList) ProtoMessage() {}
func (*NamespaceList) Descriptor() ([]byte, []int) {return fileDescriptor_6c07b07c062484ab, []int{93}
}
func (m *NamespaceList) XXX_Unmarshal(b []byte) error {return m.Unmarshal(b)
}
func (m *NamespaceList) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {b = b[:cap(b)]n, err := m.MarshalToSizedBuffer(b)if err != nil {return nil, err}return b[:n], nil
}
func (m *NamespaceList) XXX_Merge(src proto.Message) {xxx_messageInfo_NamespaceList.Merge(m, src)
}
func (m *NamespaceList) XXX_Size() int {return m.Size()
}
func (m *NamespaceList) XXX_DiscardUnknown() {xxx_messageInfo_NamespaceList.DiscardUnknown(m)
}var xxx_messageInfo_NamespaceList proto.InternalMessageInfofunc (m *NamespaceSpec) Reset()      { *m = NamespaceSpec{} }
func (*NamespaceSpec) ProtoMessage() {}
func (*NamespaceSpec) Descriptor() ([]byte, []int) {return fileDescriptor_6c07b07c062484ab, []int{94}
}
func (m *NamespaceSpec) XXX_Unmarshal(b []byte) error {return m.Unmarshal(b)
}
func (m *NamespaceSpec) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {b = b[:cap(b)]n, err := m.MarshalToSizedBuffer(b)if err != nil {return nil, err}return b[:n], nil
}
func (m *NamespaceSpec) XXX_Merge(src proto.Message) {xxx_messageInfo_NamespaceSpec.Merge(m, src)
}
func (m *NamespaceSpec) XXX_Size() int {return m.Size()
}
func (m *NamespaceSpec) XXX_DiscardUnknown() {xxx_messageInfo_NamespaceSpec.DiscardUnknown(m)
}var xxx_messageInfo_NamespaceSpec proto.InternalMessageInfofunc (m *NamespaceStatus) Reset()      { *m = NamespaceStatus{} }
func (*NamespaceStatus) ProtoMessage() {}
func (*NamespaceStatus) Descriptor() ([]byte, []int) {return fileDescriptor_6c07b07c062484ab, []int{95}
}
func (m *NamespaceStatus) XXX_Unmarshal(b []byte) error {return m.Unmarshal(b)
}
func (m *NamespaceStatus) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {b = b[:cap(b)]n, err := m.MarshalToSizedBuffer(b)if err != nil {return nil, err}return b[:n], nil
}
func (m *NamespaceStatus) XXX_Merge(src proto.Message) {xxx_messageInfo_NamespaceStatus.Merge(m, src)
}
func (m *NamespaceStatus) XXX_Size() int {return m.Size()
}
func (m *NamespaceStatus) XXX_DiscardUnknown() {xxx_messageInfo_NamespaceStatus.DiscardUnknown(m)
}var xxx_messageInfo_NamespaceStatus proto.InternalMessageInfo

4.Namespace Informer机制代码

  • Informer 代码在 client-go 项目中维护

4.1.Namespace Informer代码

kubernetes/staging/src/k8s.io/client-go/informers/core/v1/namespace.go

package v1import (context "context"time "time"apicorev1 "k8s.io/api/core/v1"metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"runtime "k8s.io/apimachinery/pkg/runtime"watch "k8s.io/apimachinery/pkg/watch"internalinterfaces "k8s.io/client-go/informers/internalinterfaces"kubernetes "k8s.io/client-go/kubernetes"corev1 "k8s.io/client-go/listers/core/v1"cache "k8s.io/client-go/tools/cache"
)// NamespaceInformer provides access to a shared informer and lister for
// Namespaces.
type NamespaceInformer interface {Informer() cache.SharedIndexInformerLister() corev1.NamespaceLister
}type namespaceInformer struct {factory          internalinterfaces.SharedInformerFactorytweakListOptions internalinterfaces.TweakListOptionsFunc
}// NewNamespaceInformer constructs a new informer for Namespace type.
// Always prefer using an informer factory to get a shared informer instead of getting an independent
// one. This reduces memory footprint and number of connections to the server.
func NewNamespaceInformer(client kubernetes.Interface, resyncPeriod time.Duration, indexers cache.Indexers) cache.SharedIndexInformer {return NewFilteredNamespaceInformer(client, resyncPeriod, indexers, nil)
}// NewFilteredNamespaceInformer constructs a new informer for Namespace type.
// Always prefer using an informer factory to get a shared informer instead of getting an independent
// one. This reduces memory footprint and number of connections to the server.
func NewFilteredNamespaceInformer(client kubernetes.Interface, resyncPeriod time.Duration, indexers cache.Indexers, tweakListOptions internalinterfaces.TweakListOptionsFunc) cache.SharedIndexInformer {return cache.NewSharedIndexInformer(&cache.ListWatch{ListFunc: func(options metav1.ListOptions) (runtime.Object, error) {if tweakListOptions != nil {tweakListOptions(&options)}return client.CoreV1().Namespaces().List(context.TODO(), options)},WatchFunc: func(options metav1.ListOptions) (watch.Interface, error) {if tweakListOptions != nil {tweakListOptions(&options)}return client.CoreV1().Namespaces().Watch(context.TODO(), options)},},&apicorev1.Namespace{},resyncPeriod,indexers,)
}func (f *namespaceInformer) defaultInformer(client kubernetes.Interface, resyncPeriod time.Duration) cache.SharedIndexInformer {return NewFilteredNamespaceInformer(client, resyncPeriod, cache.Indexers{cache.NamespaceIndex: cache.MetaNamespaceIndexFunc}, f.tweakListOptions)
}func (f *namespaceInformer) Informer() cache.SharedIndexInformer {return f.factory.InformerFor(&apicorev1.Namespace{}, f.defaultInformer)
}func (f *namespaceInformer) Lister() corev1.NamespaceLister {return corev1.NewNamespaceLister(f.Informer().GetIndexer())
}

4.2.Namespace Lister代码

kubernetes/staging/src/k8s.io/client-go/listers/core/v1/namespace.go

  • client-go对 lister的代码统一放在 listers 目录下
package v1import (corev1 "k8s.io/api/core/v1"labels "k8s.io/apimachinery/pkg/labels"listers "k8s.io/client-go/listers"cache "k8s.io/client-go/tools/cache"
)// NamespaceLister helps list Namespaces.
// All objects returned here must be treated as read-only.
type NamespaceLister interface {// List lists all Namespaces in the indexer.// Objects returned here must be treated as read-only.List(selector labels.Selector) (ret []*corev1.Namespace, err error)// Get retrieves the Namespace from the index for a given name.// Objects returned here must be treated as read-only.Get(name string) (*corev1.Namespace, error)NamespaceListerExpansion
}// namespaceLister implements the NamespaceLister interface.
type namespaceLister struct {listers.ResourceIndexer[*corev1.Namespace]
}// NewNamespaceLister returns a new NamespaceLister.
func NewNamespaceLister(indexer cache.Indexer) NamespaceLister {return &namespaceLister{listers.New[*corev1.Namespace](indexer, corev1.Resource("namespace"))}
}

4.3.代码讲解

  • Informer代码

    • NamespaceInformer 接口，包含 Informer()、Lister() 两个方法
      • Informer()：用于获取 Namespace Informer，kubernetes内部资源的 Informer 都统一放在缓存中，所以这个方法是从缓存中获取对应的Informer，获取不到就创建放入缓存再返回
      • Lister()：用于获取一个 NamespaceLister，NamespaceLister是用于从共享缓存中获取Namespace对象的，避免从apiserver读取
    • namespaceInformer 结构体 实现了 NamespaceInformer 接口，并且包含 factory、tweakListOptions两个参数
      • factory：工厂接口，包含2个方法，其中InformerFor方法是创建api对象的通用方法，namespaceInformer可以通过这个factory的InformerFor方法，快捷简便的创建一个cache.SharedIndexInformer对象
      • tweakListOptions：对option的调整函数，可以定义通用的ns调整方法，在需要的时机对ns对象做调整
    • NewNamespaceInformer/NewFilteredNamespaceInformer包级函数（静态方法）：创建一个NamespaceInformer，类型为 cache.SharedIndexInformer，用于操作ns 的ListAndWatch
    • namespaceInformer 的接收器函数（成员方法）：
      • Informer()：实现NamespaceInformer 接口方法，获取缓存中的 namespace Informer。调用namespaceInformer中factory的InformerFor方法，即可获取缓存 cache.SharedIndexInformer 中的namespace Informer，如果缓存中不存在，就会创建一个加入缓存并返回
      • Lister()：实现 NamespaceInformer 接口方法，New一个新的 namespace Lister

  • Lister代码

    • NamespaceLister 接口，包含 List()、Get() 两个方法
      • List()：List Namespace 对象
      • Get()：Get namespace 对象
    • namespaceLister 结构体，实现NamespaceLister 接口，不过它不是自己实现List、Get方法，而是通过一个 资源索引器 listers.ResourceIndexer，拿到索引器中的namespace索引器 listers.ResourceIndexer[*corev1.Namespace]。这个索引器实现了List()、Get() 两个方法
      • 因此创建namespaceLister对象时，需要传入一个 cache.Indexer
    • NewNamespaceLister 包级函数：创建一个NamespaceLister，入参 cache.Indexer，方法逻辑为 根据cache.Indexer创建一个listers.ResourceIndexer[*corev1.Namespace]，封装为 NamespaceLister 对象后返回

  • 注意事项

    • 从上面代码细节可以看出，Informer是存在缓存中的，创建一次即可，后续都会直接复用。而Lister对象没有放入缓存，每次调用 namespaceInformer.Lister()，都会创建一个新的Lister，所以我们在编写CRD Controller时，有时会创建一个 Lister 放在 CRDController中，之后就都可以使用了

5.client-go 如何实现 namespace 资源与kubernetes集群的交互？

在这里插入图片描述

5.1.Clientset 维护了所有 GV 的 Client

kubernetes/staging/src/k8s.io/client-go/kubernetes/clientset.go

  • client-go中，所有的内置资源client都属于clientset，在client-go/kubernetes/clientset.go中，定义了统一的Clientset接口Interface，每个GV都有一个对应的方法。Namespace属于core/v1，所以我们关注CoreV1即可
  • Clientset 结构体，内部包含了所有GV的 client（core/v1的client为*corev1.CoreV1Client）
  • Clientset 实现了 Interface 接口，CoreV1方法就是返回 coreV1 的client
  • core/v1 的 client 为 corev1.CoreV1Client 类型
package kubernetesimport (fmt "fmt"http "net/http"...corev1 "k8s.io/client-go/kubernetes/typed/core/v1"...
)type Interface interface {Discovery() discovery.DiscoveryInterface...CoreV1() corev1.CoreV1Interface...
}// Clientset contains the clients for groups.
type Clientset struct {*discovery.DiscoveryClient...coreV1                        *corev1.CoreV1Client...
}...// CoreV1 retrieves the CoreV1Client
func (c *Clientset) CoreV1() corev1.CoreV1Interface {return c.coreV1
}...// NewForConfig creates a new Clientset for the given config.
// If config's RateLimiter is not set and QPS and Burst are acceptable,
// NewForConfig will generate a rate-limiter in configShallowCopy.
// NewForConfig is equivalent to NewForConfigAndClient(c, httpClient),
// where httpClient was generated with rest.HTTPClientFor(c).
func NewForConfig(c *rest.Config) (*Clientset, error) {configShallowCopy := *cif configShallowCopy.UserAgent == "" {configShallowCopy.UserAgent = rest.DefaultKubernetesUserAgent()}// share the transport between all clientshttpClient, err := rest.HTTPClientFor(&configShallowCopy)if err != nil {return nil, err}return NewForConfigAndClient(&configShallowCopy, httpClient)
}// NewForConfigAndClient creates a new Clientset for the given config and http client.
// Note the http client provided takes precedence over the configured transport values.
// If config's RateLimiter is not set and QPS and Burst are acceptable,
// NewForConfigAndClient will generate a rate-limiter in configShallowCopy.
func NewForConfigAndClient(c *rest.Config, httpClient *http.Client) (*Clientset, error) {configShallowCopy := *cif configShallowCopy.RateLimiter == nil && configShallowCopy.QPS > 0 {if configShallowCopy.Burst <= 0 {return nil, fmt.Errorf("burst is required to be greater than 0 when RateLimiter is not set and QPS is set to greater than 0")}configShallowCopy.RateLimiter = flowcontrol.NewTokenBucketRateLimiter(configShallowCopy.QPS, configShallowCopy.Burst)}var cs Clientsetvar err error...cs.coreV1, err = corev1.NewForConfigAndClient(&configShallowCopy, httpClient)if err != nil {return nil, err}...
}...
// New creates a new Clientset for the given RESTClient.
func New(c rest.Interface) *Clientset {var cs Clientset...cs.coreV1 = corev1.New(c)...cs.DiscoveryClient = discovery.NewDiscoveryClient(c)return &cs
}

5.2.corev1 Client

kubernetes/staging/src/k8s.io/client-go/kubernetes/typed/core/v1/core_client.go

  • corev1 Client 包含一个 CoreV1Interface 接口，该接口继承了 所有的资源接口，包括 Namespace 的接口 NamespacesGetter 接口
  • CoreV1Client 结构体，实现了 CoreV1Interface 接口，继而实现了所有的资源接口，包括 NamespacesGetter 接口。NamespacesGetter 接口只有一个方法 Namespaces()
package v1import (http "net/http"corev1 "k8s.io/api/core/v1"scheme "k8s.io/client-go/kubernetes/scheme"rest "k8s.io/client-go/rest"
)type CoreV1Interface interface {RESTClient() rest.Interface...NamespacesGetter...
}// CoreV1Client is used to interact with features provided by the  group.
type CoreV1Client struct {restClient rest.Interface
}
...func (c *CoreV1Client) Namespaces() NamespaceInterface {return newNamespaces(c)
}...// New creates a new CoreV1Client for the given RESTClient.
func New(c rest.Interface) *CoreV1Client {return &CoreV1Client{c}
}func setConfigDefaults(config *rest.Config) error {gv := corev1.SchemeGroupVersionconfig.GroupVersion = &gvconfig.APIPath = "/api"config.NegotiatedSerializer = rest.CodecFactoryForGeneratedClient(scheme.Scheme, scheme.Codecs).WithoutConversion()if config.UserAgent == "" {config.UserAgent = rest.DefaultKubernetesUserAgent()}return nil
}// RESTClient returns a RESTClient that is used to communicate
// with API server by this client implementation.
func (c *CoreV1Client) RESTClient() rest.Interface {if c == nil {return nil}return c.restClient
}

5.3.NamespacesGetter接口

kubernetes/staging/src/k8s.io/client-go/kubernetes/typed/core/v1/namespace.go

  • NamespacesGetter 接口只有一个方法 Namespaces()，返回值为 NamespaceInterface 接口类型
  • NamespaceInterface 接口包含了操作namespace的所有方法：Create、Update、UpdateStatus、Delete、Get、List、Watch、Patch、Apply、ApplyStatus
  • namespaces 结构体 实现了NamespacesGetter 接口，所以 CoreV1Client 在实现NamespacesGetter时，其实就是返回了一个namespaces类型的对象，该对象就具有操作namespace的所有方法
    • ​​namespaces 结构体通过嵌入 gentype.ClientWithListAndApply（泛型客户端），​​自动继承其所有方法​​。ClientWithListAndApply 实现了 NamespaceInterface 接口的方法，则 namespaces 也会隐式实现该接口。
    • ClientWithListAndApply 封装了对 Kubernetes API 的底层操作（如 List、Apply 等方法），通过泛型参数 *corev1.Namespace、*corev1.NamespaceList 等指定资源类型
package v1import (context "context"corev1 "k8s.io/api/core/v1"metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"types "k8s.io/apimachinery/pkg/types"watch "k8s.io/apimachinery/pkg/watch"applyconfigurationscorev1 "k8s.io/client-go/applyconfigurations/core/v1"gentype "k8s.io/client-go/gentype"scheme "k8s.io/client-go/kubernetes/scheme"
)// NamespacesGetter has a method to return a NamespaceInterface.
// A group's client should implement this interface.
type NamespacesGetter interface {Namespaces() NamespaceInterface
}// NamespaceInterface has methods to work with Namespace resources.
type NamespaceInterface interface {Create(ctx context.Context, namespace *corev1.Namespace, opts metav1.CreateOptions) (*corev1.Namespace, error)Update(ctx context.Context, namespace *corev1.Namespace, opts metav1.UpdateOptions) (*corev1.Namespace, error)// Add a +genclient:noStatus comment above the type to avoid generating UpdateStatus().UpdateStatus(ctx context.Context, namespace *corev1.Namespace, opts metav1.UpdateOptions) (*corev1.Namespace, error)Delete(ctx context.Context, name string, opts metav1.DeleteOptions) errorGet(ctx context.Context, name string, opts metav1.GetOptions) (*corev1.Namespace, error)List(ctx context.Context, opts metav1.ListOptions) (*corev1.NamespaceList, error)Watch(ctx context.Context, opts metav1.ListOptions) (watch.Interface, error)Patch(ctx context.Context, name string, pt types.PatchType, data []byte, opts metav1.PatchOptions, subresources ...string) (result *corev1.Namespace, err error)Apply(ctx context.Context, namespace *applyconfigurationscorev1.NamespaceApplyConfiguration, opts metav1.ApplyOptions) (result *corev1.Namespace, err error)// Add a +genclient:noStatus comment above the type to avoid generating ApplyStatus().ApplyStatus(ctx context.Context, namespace *applyconfigurationscorev1.NamespaceApplyConfiguration, opts metav1.ApplyOptions) (result *corev1.Namespace, err error)NamespaceExpansion
}// namespaces implements NamespaceInterface
type namespaces struct {*gentype.ClientWithListAndApply[*corev1.Namespace, *corev1.NamespaceList, *applyconfigurationscorev1.NamespaceApplyConfiguration]
}// newNamespaces returns a Namespaces
func newNamespaces(c *CoreV1Client) *namespaces {return &namespaces{gentype.NewClientWithListAndApply[*corev1.Namespace, *corev1.NamespaceList, *applyconfigurationscorev1.NamespaceApplyConfiguration]("namespaces",c.RESTClient(),scheme.ParameterCodec,"",func() *corev1.Namespace { return &corev1.Namespace{} },func() *corev1.NamespaceList { return &corev1.NamespaceList{} },gentype.PrefersProtobuf[*corev1.Namespace](),),}
}

5.4.总结

在这里插入图片描述

  • 现在再看这张图，就知道为什么 很多Controller编写的时候，都会自己持有一个 kubernetes.Interface 接口对象，用于操作环境内置资源。
  • 创建一个 kubernetes.Interface，其实就是Clientset对象
  • 调用 Clientset 对象的CoreV1()，即可获得一个CoreV1Interface，其实就是CoreV1Client对象
  • 调用 CoreV1Client 对象的Namespaces()，即可获取一个操作Namespace的对象，即namespaces对象
  • namespaces对象 具有诸多方法，用于操作环境中的ns。如：Create、Update等

6.Namespace Controller代码

在这里插入图片描述

  • 前置学习中，我们知道controller informer内部架构是这样，所以new controller的时候，我们需要提供：event handlers、workqueue、processNextItem、worker、indexer。

6.1.声明 NamespaceController struct

kubernetes/pkg/controller/namespace/namespace_controller.go

  • lister corelisters.NamespaceLister
    • 用于从共享缓存中列出命名空间（Namespace）对象。Lister 其实就是indexer，包含Get、List方法，用于从缓存中只读访问资源，避免直接调用 API Server
  • listerSynced cache.InformerSynced
    • InformerSynced 是一个函数类型，返回一个布尔值，表示缓存是否已同步
    • 确保在控制器开始处理事件之前，缓存中的数据已经与 API Server 同步
    • 如果缓存未同步，控制器可能会处理过时或不完整的数据
  • queue workqueue.TypedRateLimitingInterface[string]
    • queue 是一个速率限制队列，其实就是workqueue，用于存储需要处理的命名空间key。
    • 它支持对事件进行去重、延迟处理和速率限制。
    • 例如，当命名空间被删除时，事件会被加入队列，控制器的 worker 会从队列中取出key并处理。
  • namespacedResourcesDeleter deletion.NamespacedResourcesDeleterInterface
    • ns资源删除器，用于删除命名空间中的所有资源的接口
    • 当命名空间被标记为删除时，调用此字段的实现来清理命名空间中的所有资源（如 Pod、Service 等）。确保命名空间中的资源被安全地清理后，命名空间本身才能被删除
package namespace// NamespaceController is responsible for performing actions dependent upon a namespace phase
type NamespaceController struct {// lister that can list namespaces from a shared cachelister corelisters.NamespaceLister// returns true when the namespace cache is readylisterSynced cache.InformerSynced// namespaces that have been queued up for processing by workersqueue workqueue.TypedRateLimitingInterface[string]// helper to delete all resources in the namespace when the namespace is deleted.namespacedResourcesDeleter deletion.NamespacedResourcesDeleterInterface
}

6.2.创建 Namespace Controller

kubernetes/pkg/controller/namespace/namespace_controller.go

import ("context""fmt""time""golang.org/x/time/rate"v1 "k8s.io/api/core/v1""k8s.io/apimachinery/pkg/api/errors"metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"utilruntime "k8s.io/apimachinery/pkg/util/runtime""k8s.io/apimachinery/pkg/util/wait"coreinformers "k8s.io/client-go/informers/core/v1"clientset "k8s.io/client-go/kubernetes"corelisters "k8s.io/client-go/listers/core/v1""k8s.io/client-go/metadata""k8s.io/client-go/tools/cache""k8s.io/client-go/util/workqueue""k8s.io/kubernetes/pkg/controller""k8s.io/kubernetes/pkg/controller/namespace/deletion""k8s.io/klog/v2"
)// NewNamespaceController creates a new NamespaceController
func NewNamespaceController(ctx context.Context,kubeClient clientset.Interface,metadataClient metadata.Interface,discoverResourcesFn func() ([]*metav1.APIResourceList, error),namespaceInformer coreinformers.NamespaceInformer,resyncPeriod time.Duration,finalizerToken v1.FinalizerName) *NamespaceController {// create the controller so we can inject the enqueue functionnamespaceController := &NamespaceController{queue: workqueue.NewTypedRateLimitingQueueWithConfig(nsControllerRateLimiter(),workqueue.TypedRateLimitingQueueConfig[string]{Name: "namespace",},),namespacedResourcesDeleter: deletion.NewNamespacedResourcesDeleter(ctx, kubeClient.CoreV1().Namespaces(), metadataClient, kubeClient.CoreV1(), discoverResourcesFn, finalizerToken),}// configure the namespace informer event handlersnamespaceInformer.Informer().AddEventHandlerWithResyncPeriod(cache.ResourceEventHandlerFuncs{AddFunc: func(obj interface{}) {namespace := obj.(*v1.Namespace)namespaceController.enqueueNamespace(namespace)},UpdateFunc: func(oldObj, newObj interface{}) {namespace := newObj.(*v1.Namespace)namespaceController.enqueueNamespace(namespace)},},resyncPeriod,)namespaceController.lister = namespaceInformer.Lister()namespaceController.listerSynced = namespaceInformer.Informer().HasSyncedreturn namespaceController
}

6.2.1.入参分析

  • 入参：
    • clientset.Interface
      • 从上面导包看，clientset "k8s.io/client-go/kubernetes"，就是第5章讲的clientset，该client可用于操作ns
    • metadata.Interface
      • "k8s.io/client-go/metadata" 是 Kubernetes client-go 库中用于 ​​轻量级元数据操作​​ 的核心组件，其设计目标是通过 ​​不依赖具体资源类型结构​​ 的方式，实现对任意 Kubernetes 资源（包括 CRD）的元数据（如标签、注解、所有者引用等）进行高效操作
    • discoverResourcesFn func() ([]*metav1.APIResourceList, error)
      • 一个函数，用于发现集群中所有的 API 资源，动态发现集群中支持的资源类型。在清理命名空间时，确定需要删除的资源类型
      • 实际上就类似通过 kubectl api-resources 找到所有的资源类型，确定哪些需要回收，哪些不需要回收
    • namespaceInformer coreinformers.NamespaceInformer
      • 命名空间的 informer，用于监听和缓存命名空间的变化
      • 提供命名空间的事件通知（如新增、更新、删除），提供命名空间的缓存访问接口，避免频繁调用 API Server
    • resyncPeriod time.Duration
      • informer 的重新同步周期。定期触发重新同步，即使没有资源变化，也会重新处理资源
    • finalizerToken v1.FinalizerName
      • 命名空间删除时使用的 finalizer 标识符。一般使用 kubernetes

6.2.2.创建 NamespaceController 实例

// create the controller so we can inject the enqueue function
namespaceController := &NamespaceController{queue: workqueue.NewTypedRateLimitingQueueWithConfig(nsControllerRateLimiter(),workqueue.TypedRateLimitingQueueConfig[string]{Name: "namespace",},),namespacedResourcesDeleter: deletion.NewNamespacedResourcesDeleter(ctx,kubeClient.CoreV1().Namespaces(), metadataClient, kubeClient.CoreV1(), discoverResourcesFn, finalizerToken),
}// nsControllerRateLimiter is tuned for a faster than normal recycle time with default backoff speed and default overall
// requeing speed.  We do this so that namespace cleanup is reliably faster and we know that the number of namespaces being
// deleted is smaller than total number of other namespace scoped resources in a cluster.
func nsControllerRateLimiter() workqueue.TypedRateLimiter[string] {return workqueue.NewTypedMaxOfRateLimiter(// this ensures that we retry namespace deletion at least every minute, never longer.workqueue.NewTypedItemExponentialFailureRateLimiter[string](5*time.Millisecond, 60*time.Second),// 10 qps, 100 bucket size.  This is only for retry speed and its only the overall factor (not per item)&workqueue.TypedBucketRateLimiter[string]{Limiter: rate.NewLimiter(rate.Limit(10), 100)},)
}
  • queue:
    • 创建一个速率限制队列，作为workqueue，用于存储需待处理的Namespace key
    • 使用 nsControllerRateLimiter 配置速率限制器，确保事件处理的速率可控
  • nsControllerRateLimiter方法
    • nsControllerRateLimiter 是一个专门为命名空间清理任务设计的速率限制器函数。
    • 它的目的是通过调整重试和请求速率，使命名空间的清理过程更加高效和可靠。
    • 由于命名空间的清理通常涉及较少的资源，但需要快速完成，因此该函数的速率限制器被调优为比默认速率更快。
  • namespacedResourcesDeleter:
    • 创建一个 NamespacedResourcesDeleter 实例，用于清理命名空间中的资源。
    • 传入上下文、命名空间客户端、元数据客户端、资源发现函数和 finalizer 标识符。

6.2.3.配置命名空间事件处理器

namespaceInformer.Informer().AddEventHandlerWithResyncPeriod(cache.ResourceEventHandlerFuncs{AddFunc: func(obj interface{}) {namespace := obj.(*v1.Namespace)namespaceController.enqueueNamespace(namespace)},UpdateFunc: func(oldObj, newObj interface{}) {namespace := newObj.(*v1.Namespace)namespaceController.enqueueNamespace(namespace)},},resyncPeriod,
)// enqueueNamespace adds an object to the controller work queue
// obj could be an *v1.Namespace, or a DeletionFinalStateUnknown item.
func (nm *NamespaceController) enqueueNamespace(obj interface{}) {key, err := controller.KeyFunc(obj)if err != nil {utilruntime.HandleError(fmt.Errorf("Couldn't get key for object %+v: %v", obj, err))return}namespace := obj.(*v1.Namespace)// don't queue if we aren't deletedif namespace.DeletionTimestamp == nil || namespace.DeletionTimestamp.IsZero() {return}// delay processing namespace events to allow HA api servers to observe namespace deletion,// and HA etcd servers to observe last minute object creations inside the namespacenm.queue.AddAfter(key, namespaceDeletionGracePeriod)
}

  • AddEventHandlerWithResyncPeriod:

    • 为命名空间的 informer 配置事件处理器。
    • 监听命名空间的新增和更新事件，并将事件加入队列。

  • 事件处理逻辑:

    • AddFunc: 当有新的命名空间被创建时，调用 enqueueNamespace 将其加入队列。
    • UpdateFunc: 当命名空间被更新时，调用 enqueueNamespace 将其加入队列。
    • 不过这里 enqueueNamespace 只会把删除中的 namespace 入队，其他的忽略

  • 为什么delete操作，需要通过update事件将key入队？

    • ns默认都有finalizer的，当发起delete时，不会直接删除，而是在metadata中添加deletiontimestramp，标记为逻辑删除，该过程是一个update事件

6.2.4.设置命名空间缓存和同步函数

namespaceController.lister = namespaceInformer.Lister()
namespaceController.listerSynced = namespaceInformer.Informer().HasSynced
  • lister:
    • 从 namespaceInformer 获取命名空间的 lister，放入Controller中维护，用于高效访问缓存中的命名空间对象。
  • listerSynced:
    • 设置缓存同步函数，用于检查缓存是否已与 API Server 同步

6.3.Namespace Controller 删除逻辑

6.3.1.事件key入队

kubernetes/pkg/controller/namespace/namespace_controller.go

  • 这里 enqueueNamespace 只会把删除中的 namespace 入队，其他的忽略
// enqueueNamespace adds an object to the controller work queue
// obj could be an *v1.Namespace, or a DeletionFinalStateUnknown item.
func (nm *NamespaceController) enqueueNamespace(obj interface{}) {key, err := controller.KeyFunc(obj)if err != nil {utilruntime.HandleError(fmt.Errorf("Couldn't get key for object %+v: %v", obj, err))return}namespace := obj.(*v1.Namespace)// don't queue if we aren't deletedif namespace.DeletionTimestamp == nil || namespace.DeletionTimestamp.IsZero() {return}// delay processing namespace events to allow HA api servers to observe namespace deletion,// and HA etcd servers to observe last minute object creations inside the namespacenm.queue.AddAfter(key, namespaceDeletionGracePeriod)
}

6.3.2.worker逻辑

kubernetes/pkg/controller/namespace/namespace_controller.go

  • worker：
    • 将ns处理逻辑封装为一个方法 workFunc，后面就是死循环，不停调用这个workFunc
    • workFunc 代码分析：
      • 从队列中弹出一个key。如果收到停止信号则终止
      • 对该 key 进行处理，nm.syncNamespaceFromKey(ctx, key)
      • 处理过程发生error，根据错误类型采取不同的处理方式，以确保命名空间的删除任务能够被有效地重试。
        • *deletion.ResourcesRemainingError 类型的错误，通常表示命名空间中仍然存在未清理的资源。提取错误中的 Estimate 字段，表示剩余资源的估计数量。然后计算一个等待时间 t，其值为剩余资源数量的一半加 1。这种计算方式是为了动态调整重试间隔，避免频繁重试导致系统负载过高。然后通过调用 nm.queue.AddAfter 方法，将命名空间重新加入队列，并设置延迟时间为 t 秒。
        • 其他类型的删除失败。为了避免等待完整的重新同步周期，代码调用 nm.queue.AddRateLimited 方法，将命名空间以速率限制的方式重新加入队列。这种方式可以控制重试频率，防止队列过载。同时，代码使用 utilruntime.HandleError 记录错误信息，方便后续的调试和问题排查。
  • syncNamespaceFromKey：
    • 记录处理耗时，输出到日志备查
    • 使用namespaceController中的Lister，从缓存中查询ns
    • 使用namespacedResourcesDeleter删除ns
// worker processes the queue of namespace objects.
// Each namespace can be in the queue at most once.
// The system ensures that no two workers can process
// the same namespace at the same time.
func (nm *NamespaceController) worker(ctx context.Context) {workFunc := func(ctx context.Context) bool {key, quit := nm.queue.Get()if quit {return true}defer nm.queue.Done(key)err := nm.syncNamespaceFromKey(ctx, key)if err == nil {// no error, forget this entry and returnnm.queue.Forget(key)return false}if estimate, ok := err.(*deletion.ResourcesRemainingError); ok {t := estimate.Estimate/2 + 1klog.FromContext(ctx).V(4).Info("Content remaining in namespace", "namespace", key, "waitSeconds", t)nm.queue.AddAfter(key, time.Duration(t)*time.Second)} else {// rather than wait for a full resync, re-add the namespace to the queue to be processednm.queue.AddRateLimited(key)utilruntime.HandleError(fmt.Errorf("deletion of namespace %v failed: %v", key, err))}return false}for {quit := workFunc(ctx)if quit {return}}
}// syncNamespaceFromKey looks for a namespace with the specified key in its store and synchronizes it
func (nm *NamespaceController) syncNamespaceFromKey(ctx context.Context, key string) (err error) {startTime := time.Now()logger := klog.FromContext(ctx)defer func() {logger.V(4).Info("Finished syncing namespace", "namespace", key, "duration", time.Since(startTime))}()namespace, err := nm.lister.Get(key)if errors.IsNotFound(err) {logger.Info("Namespace has been deleted", "namespace", key)return nil}if err != nil {utilruntime.HandleError(fmt.Errorf("Unable to retrieve namespace %v from store: %v", key, err))return err}return nm.namespacedResourcesDeleter.Delete(ctx, namespace.Name)
}

6.4.namespacedResourcesDeleter删除器

kubernetes/pkg/controller/namespace/deletion/namespaced_resources_deleter.go

6.4.1.NamespacedResourcesDeleter数据结构

  • NamespacedResourcesDeleterInterface接口：Namespace删除器接口，NamespaceController持有一个该接口实例，调用Delete()完成ns删除
  • namespacedResourcesDeleter结构体：实现了NamespacedResourcesDeleterInterface接口，并且内部维护了一些客户端、资源发现方法、finalizer的key
  • NewNamespacedResourcesDeleter方法：创建一个NamespacedResourcesDeleter实例，即namespacedResourcesDeleter对象。
    • 其中 d.initOpCache(ctx) 是初始化 namespacedResourcesDeleter 的操作缓存 (opCache)，以便记录哪些操作在特定的资源上不被支持。
    • 它通过调用 discoverResourcesFn 获取集群中所有支持的资源信息，并根据资源的操作能力填充缓存。这种缓存机制可以优化后续的资源操作逻辑，避免不必要的 HTTP 405 错误。
    • 这里主要是判断哪些资源不支持delete操作，缓存下来
// NamespacedResourcesDeleterInterface is the interface to delete a namespace with all resources in it.
type NamespacedResourcesDeleterInterface interface {Delete(ctx context.Context, nsName string) error
}// NewNamespacedResourcesDeleter returns a new NamespacedResourcesDeleter.
func NewNamespacedResourcesDeleter(ctx context.Context, nsClient v1clientset.NamespaceInterface,metadataClient metadata.Interface, podsGetter v1clientset.PodsGetter,discoverResourcesFn func() ([]*metav1.APIResourceList, error),finalizerToken v1.FinalizerName) NamespacedResourcesDeleterInterface {d := &namespacedResourcesDeleter{nsClient:       nsClient,metadataClient: metadataClient,podsGetter:     podsGetter,opCache: &operationNotSupportedCache{m: make(map[operationKey]bool),},discoverResourcesFn: discoverResourcesFn,finalizerToken:      finalizerToken,}d.initOpCache(ctx)return d
}var _ NamespacedResourcesDeleterInterface = &namespacedResourcesDeleter{}// namespacedResourcesDeleter is used to delete all resources in a given namespace.
type namespacedResourcesDeleter struct {// Client to manipulate the namespace.nsClient v1clientset.NamespaceInterface// Dynamic client to list and delete all namespaced resources.metadataClient metadata.Interface// Interface to get PodInterface.podsGetter v1clientset.PodsGetter// Cache of what operations are not supported on each group version resource.opCache             *operationNotSupportedCachediscoverResourcesFn func() ([]*metav1.APIResourceList, error)// The finalizer token that should be removed from the namespace// when all resources in that namespace have been deleted.finalizerToken v1.FinalizerName
}

6.4.2.namespacedResourcesDeleter实现了Delete方法

  • 删除ns之前，会先删除ns中所有的资源，核心方法即为 deleteAllContent
// Delete deletes all resources in the given namespace.
// Before deleting resources:
//   - It ensures that deletion timestamp is set on the
//     namespace (does nothing if deletion timestamp is missing).
//   - Verifies that the namespace is in the "terminating" phase
//     (updates the namespace phase if it is not yet marked terminating)
//
// After deleting the resources:
// * It removes finalizer token from the given namespace.
//
// Returns an error if any of those steps fail.
// Returns ResourcesRemainingError if it deleted some resources but needs
// to wait for them to go away.
// Caller is expected to keep calling this until it succeeds.
func (d *namespacedResourcesDeleter) Delete(ctx context.Context, nsName string) error {// Multiple controllers may edit a namespace during termination// first get the latest state of the namespace before proceeding// if the namespace was deleted already, don't do anythingnamespace, err := d.nsClient.Get(ctx, nsName, metav1.GetOptions{})if err != nil {if errors.IsNotFound(err) {return nil}return err}if namespace.DeletionTimestamp == nil {return nil}klog.FromContext(ctx).V(5).Info("Namespace controller - syncNamespace", "namespace", namespace.Name, "finalizerToken", d.finalizerToken)// ensure that the status is up to date on the namespace// if we get a not found error, we assume the namespace is truly gonenamespace, err = d.retryOnConflictError(ctx, namespace, d.updateNamespaceStatusFunc)if err != nil {if errors.IsNotFound(err) {return nil}return err}// the latest view of the namespace asserts that namespace is no longer deleting..if namespace.DeletionTimestamp.IsZero() {return nil}// return if it is already finalized.if finalized(namespace) {return nil}// there may still be content for us to removeestimate, err := d.deleteAllContent(ctx, namespace)if err != nil {return err}if estimate > 0 {return &ResourcesRemainingError{estimate}}// we have removed content, so mark it finalized by us_, err = d.retryOnConflictError(ctx, namespace, d.finalizeNamespace)if err != nil {// in normal practice, this should not be possible, but if a deployment is running// two controllers to do namespace deletion that share a common finalizer token it's// possible that a not found could occur since the other controller would have finished the delete.if errors.IsNotFound(err) {return nil}return err}return nil
}// deleteAllContent will use the dynamic client to delete each resource identified in groupVersionResources.
// It returns an estimate of the time remaining before the remaining resources are deleted.
// If estimate > 0, not all resources are guaranteed to be gone.
func (d *namespacedResourcesDeleter) deleteAllContent(ctx context.Context, ns *v1.Namespace) (int64, error) {namespace := ns.NamenamespaceDeletedAt := *ns.DeletionTimestampvar errs []errorconditionUpdater := namespaceConditionUpdater{}estimate := int64(0)logger := klog.FromContext(ctx)logger.V(4).Info("namespace controller - deleteAllContent", "namespace", namespace)resources, err := d.discoverResourcesFn()if err != nil {// discovery errors are not fatal.  We often have some set of resources we can operate against even if we don't have a complete listerrs = append(errs, err)conditionUpdater.ProcessDiscoverResourcesErr(err)}// TODO(sttts): get rid of opCache and pass the verbs (especially "deletecollection") down into the deleterdeletableResources := discovery.FilteredBy(discovery.SupportsAllVerbs{Verbs: []string{"delete"}}, resources)groupVersionResources, err := discovery.GroupVersionResources(deletableResources)if err != nil {// discovery errors are not fatal.  We often have some set of resources we can operate against even if we don't have a complete listerrs = append(errs, err)conditionUpdater.ProcessGroupVersionErr(err)}numRemainingTotals := allGVRDeletionMetadata{gvrToNumRemaining:        map[schema.GroupVersionResource]int{},finalizersToNumRemaining: map[string]int{},}for gvr := range groupVersionResources {gvrDeletionMetadata, err := d.deleteAllContentForGroupVersionResource(ctx, gvr, namespace, namespaceDeletedAt)if err != nil {// If there is an error, hold on to it but proceed with all the remaining// groupVersionResources.errs = append(errs, err)conditionUpdater.ProcessDeleteContentErr(err)}if gvrDeletionMetadata.finalizerEstimateSeconds > estimate {estimate = gvrDeletionMetadata.finalizerEstimateSeconds}if gvrDeletionMetadata.numRemaining > 0 {numRemainingTotals.gvrToNumRemaining[gvr] = gvrDeletionMetadata.numRemainingfor finalizer, numRemaining := range gvrDeletionMetadata.finalizersToNumRemaining {if numRemaining == 0 {continue}numRemainingTotals.finalizersToNumRemaining[finalizer] = numRemainingTotals.finalizersToNumRemaining[finalizer] + numRemaining}}}conditionUpdater.ProcessContentTotals(numRemainingTotals)// we always want to update the conditions because if we have set a condition to "it worked" after it was previously, "it didn't work",// we need to reflect that information.  Recall that additional finalizers can be set on namespaces, so this finalizer may clear itself and// NOT remove the resource instance.if hasChanged := conditionUpdater.Update(ns); hasChanged {if _, err = d.nsClient.UpdateStatus(ctx, ns, metav1.UpdateOptions{}); err != nil {utilruntime.HandleError(fmt.Errorf("couldn't update status condition for namespace %q: %v", namespace, err))}}// if len(errs)==0, NewAggregate returns nil.err = utilerrors.NewAggregate(errs)logger.V(4).Info("namespace controller - deleteAllContent", "namespace", namespace, "estimate", estimate, "err", err)return estimate, err
}

7.Namespace Controller 启动

7.1.Namespace Controller 启动核心方法

kubernetes/pkg/controller/namespace/namespace_controller.go

// Run starts observing the system with the specified number of workers.
func (nm *NamespaceController) Run(ctx context.Context, workers int) {defer utilruntime.HandleCrash()defer nm.queue.ShutDown()logger := klog.FromContext(ctx)logger.Info("Starting namespace controller")defer logger.Info("Shutting down namespace controller")if !cache.WaitForNamedCacheSync("namespace", ctx.Done(), nm.listerSynced) {return}logger.V(5).Info("Starting workers of namespace controller")for i := 0; i < workers; i++ {go wait.UntilWithContext(ctx, nm.worker, time.Second)}<-ctx.Done()
}
  • 在namespace_controller.go中有一个Run方法，是 NamespaceController 的核心启动逻辑，用于启动命名空间控制器并管理其生命周期。
    • 接受一个上下文 (ctx) 和工作线程数 (workers) 作为参数
    • 负责初始化控制器、启动工作线程并监听系统的终止信号
  • 核心逻辑：
    • 首先，函数通过 defer 语句设置了两个清理操作：utilruntime.HandleCrash() 和 nm.queue.ShutDown()。HandleCrash 用于捕获运行时的恐慌（panic），防止程序崩溃，同时记录相关信息。ShutDown 则用于在控制器停止时关闭工作队列，确保资源被正确释放。
    • 接着，函数通过 klog.FromContext(ctx) 获取日志记录器，并记录控制器启动的日志信息。函数的最后一个 defer 语句确保在控制器关闭时记录一条日志，表明控制器已停止。
    • 随后，函数调用 cache.WaitForNamedCacheSync 方法等待缓存同步完成。nm.listerSynced 是一个检查缓存是否同步的函数。如果缓存未能成功同步，函数会立即返回。这一步非常重要，因为控制器依赖缓存中的数据来处理命名空间相关的事件，未同步的缓存可能导致错误的行为。
    • 在缓存同步完成后，函数记录一条日志，表明工作线程即将启动。然后，它启动指定数量的工作线程（由 workers 参数决定）。每个线程通过 goroutine 并发运行，并调用 wait.UntilWithContext 方法。wait.UntilWithContext 会以固定的时间间隔（这里是 1 秒）调用 nm.worker 方法，直到上下文被取消。
    • 最后，函数通过 <-ctx.Done() 阻塞，等待上下文的取消信号。当上下文被取消时，控制器会停止所有工作线程并执行清理操作。

7.2.kube-controller-manager为每个Controller都声明了描述器

kubernetes/cmd/kube-controller-manager/app/core.go

func newNamespaceControllerDescriptor() *ControllerDescriptor {return &ControllerDescriptor{name:     names.NamespaceController,aliases:  []string{"namespace"},initFunc: startNamespaceController,}
}func startNamespaceController(ctx context.Context, controllerContext ControllerContext, controllerName string) (controller.Interface, bool, error) {// the namespace cleanup controller is very chatty.  It makes lots of discovery calls and then it makes lots of delete calls// the ratelimiter negatively affects its speed.  Deleting 100 total items in a namespace (that's only a few of each resource// including events), takes ~10 seconds by default.nsKubeconfig := controllerContext.ClientBuilder.ConfigOrDie("namespace-controller")nsKubeconfig.QPS *= 20nsKubeconfig.Burst *= 100namespaceKubeClient := clientset.NewForConfigOrDie(nsKubeconfig)return startModifiedNamespaceController(ctx, controllerContext, namespaceKubeClient, nsKubeconfig)
}func startModifiedNamespaceController(ctx context.Context, controllerContext ControllerContext, namespaceKubeClient clientset.Interface, nsKubeconfig *restclient.Config) (controller.Interface, bool, error) {metadataClient, err := metadata.NewForConfig(nsKubeconfig)if err != nil {return nil, true, err}discoverResourcesFn := namespaceKubeClient.Discovery().ServerPreferredNamespacedResourcesnamespaceController := namespacecontroller.NewNamespaceController(ctx,namespaceKubeClient,metadataClient,discoverResourcesFn,controllerContext.InformerFactory.Core().V1().Namespaces(),controllerContext.ComponentConfig.NamespaceController.NamespaceSyncPeriod.Duration,v1.FinalizerKubernetes,)go namespaceController.Run(ctx, int(controllerContext.ComponentConfig.NamespaceController.ConcurrentNamespaceSyncs))return nil, true, nil
}
  • kube-controller-manager为每个controller都声明了 描述器ControllerDescriptor，记录controller的名称、别名、启动方法等
  • newNamespaceControllerDescriptor 函数返回一个 ControllerDescriptor 对象
    • 用于描述命名空间控制器的基本信息。
    • name 字段指定了控制器的名称为 NamespaceController
    • aliases 字段提供了控制器的别名（如 "namespace"）
    • initFunc 字段指向了控制器的初始化函数 startNamespaceController
    • 这种描述符模式便于在控制器框架中注册和管理多个控制器
  • startNamespaceController 函数负责初始化命名空间控制器的客户端配置并调用startModifiedNamespaceController
    • 由于命名空间清理控制器需要频繁地进行资源发现和删除操作，因此函数对默认的客户端配置进行了调整，将 QPS（每秒请求数）放大了 20 倍，将 Burst（突发请求数）放大了 100 倍。
    • 这种调整可以显著提高控制器的操作速度，特别是在需要删除大量资源时。随后，函数通过 clientset.NewForConfigOrDie 创建了一个 Kubernetes 客户端，并将其传递给下一个函数
  • startModifiedNamespaceController 函数完成了命名空间控制器的核心初始化逻辑。
    • 使用 metadata.NewForConfig 创建了一个元数据客户端，用于处理资源的元信息。如果创建失败，函数会返回错误。
    • 定义了一个 discoverResourcesFn 函数，用于动态发现集群中支持的命名空间资源。
    • 函数调用 namespacecontroller.NewNamespaceController 创建了一个命名空间控制器实例，并将必要的依赖注入到控制器中，包括 Kubernetes 客户端、元数据客户端、资源发现函数、命名空间的共享信息工厂等。
    • 最后控制器通过 Run 方法启动，指定的工作线程数由 controllerContext.ComponentConfig.NamespaceController.ConcurrentNamespaceSyncs 决定。
      • controllerContext.ComponentConfig 类型为 kubectrlmgrconfig.KubeControllerManagerConfiguration，其实就是kube-controller-manager的配置，其中包含NamespaceController的配置，可以指定worker数量

7.3.注册Namespace Controller描述器

kubernetes/cmd/kube-controller-manager/app/controllermanager.go

  • controllermanager会在启动时，将注册的所有Controller都启动起来
// NewControllerDescriptors is a public map of named controller groups (you can start more than one in an init func)
// paired to their ControllerDescriptor wrapper object that includes InitFunc.
// This allows for structured downstream composition and subdivision.
func NewControllerDescriptors() map[string]*ControllerDescriptor {controllers := map[string]*ControllerDescriptor{}aliases := sets.NewString()// All the controllers must fulfil common constraints, or else we will explode.register := func(controllerDesc *ControllerDescriptor) {if controllerDesc == nil {panic("received nil controller for a registration")}name := controllerDesc.Name()if len(name) == 0 {panic("received controller without a name for a registration")}if _, found := controllers[name]; found {panic(fmt.Sprintf("controller name %q was registered twice", name))}if controllerDesc.GetInitFunc() == nil {panic(fmt.Sprintf("controller %q does not have an init function", name))}for _, alias := range controllerDesc.GetAliases() {if aliases.Has(alias) {panic(fmt.Sprintf("controller %q has a duplicate alias %q", name, alias))}aliases.Insert(alias)}controllers[name] = controllerDesc}// First add "special" controllers that aren't initialized normally. These controllers cannot be initialized// in the main controller loop initialization, so we add them here only for the metadata and duplication detection.// app.ControllerDescriptor#RequiresSpecialHandling should return true for such controllers// The only known special case is the ServiceAccountTokenController which *must* be started// first to ensure that the SA tokens for future controllers will exist. Think very carefully before adding new// special controllers.register(newServiceAccountTokenControllerDescriptor(nil))...register(newNamespaceControllerDescriptor())register(newServiceAccountControllerDescriptor())...for _, alias := range aliases.UnsortedList() {if _, ok := controllers[alias]; ok {panic(fmt.Sprintf("alias %q conflicts with a controller name", alias))}}return controllers
}

8.总结

通过上述对NamespaceController的分析，我们应该对kubernetes内置controller的编写过程很清晰了

  • 首先学习了如何声明 资源的struct，并添加一些code generation tag
    • 通过code-generation生成器，生成深拷贝、版本管理、swagger、proto/pb序列化、informer、clientset等代码
  • 还深入学习了informer机制 的代码实现，结合Informer框架的理论知识，有了更深的理解
    • informer机制中，每种资源都会有自己的 InfromerInterface，包含Infromer()、Lister()两个方法，分别用于获取Informer对象、Lister对象
      • Informer对象 负责watch+交互 环境资源
      • Lister对象 相当于Indexer，负责与本地缓存交互，包括 List()、Get()
  • 分析了client-go把所有资源client整合在一起的过程
    • Clientset包含了所有GV的Client，每个GV的Client 都包含自己gv下所有资源的Client
    • 每个gvr的client包含了 Create、List、Update、Apply 等方法，用于操作环境资源
  • 详细讲解了namespace controller的代码
    • 从NewNamespaceController开始，讲解了eventhandler设置、workqueue的配置、key的入队、worker的处理逻辑、删除ns前其他资源的回收
    • 最后还讲解了kube-controller-manager对内置controller的启动过程
  • 通过上述学习，预期达到的效果
    • 对informer、client-go内在逻辑更清晰，后续使用时更清楚
    • 具备对 kubernetes 其他的内置controller学习的能力。除了controller 核心代码的不同，其他的内容应该都大同小异，也正因如此，其他的代码才会在后面被封装成自动生成的代码，有了kubebuilder、controller-runtime等控制器框架
    • 为 CRD Controller 编写提供范本
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