ingress-controller资源-CSDN文库

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在Kubernetes（简称k8s）环境中，Ingress Controller是一个至关重要的组件，它负责对外部网络访问Kubernetes服务提供统一的入口。Ingress资源是Kubernetes API中的一个对象，用于定义HTTP和HTTPS路由规则，这些规则可以将外部请求定向到集群内的服务。Ingress Controller则是实现这些规则的服务，它可以是各种不同的实现，例如Nginx、Traefik或GCE Ingress Controller等。 Ingress Controller的工作原理是监听Kubernetes集群中Ingress资源的变化，每当有新的Ingress被创建、更新或删除时，它会动态调整其配置，以确保外部流量能够根据定义的路由规则正确地转发到相应的服务。这使得开发者无需直接暴露Pod或Service的IP，只需通过定义Ingress规则，即可实现负载均衡、SSL终止、路径匹配等功能。 `ingress.yaml`文件通常包含了Ingress资源的定义，其中可能包含以下关键字段： 1. `apiVersion`: 指定Ingress资源使用的API版本，例如`networking.k8s.io/v1`。 2. `kind`: 定义资源类型，这里是`Ingress`。 3. `metadata`: 包含资源的元数据，如`name`（资源名称）、`namespace`（命名空间）、`annotations`（注解）等。注解常用于配置特定Ingress Controller的行为。 4. `spec`: 规范部分，定义了路由规则和后端服务的映射关系。`rules`字段包含了HTTP路由规则，每个规则包括`host`（主机名，用于匹配请求的Host头）和`http.paths`（路径匹配）。`paths`下的每个条目指定了一个路径和对应的后端服务，后端通常由`service.name`（服务名称）和`service.port`（服务端口）定义。例如，一个简单的`ingress.yaml`文件可能如下所示： ```yaml apiVersion: networking.k8s.io/v1 kind: Ingress metadata: name: my-ingress annotations: nginx.ingress.kubernetes.io/rewrite-target: / spec: rules: - host: example.com http: paths: - path: /app1 pathType: Prefix backend: service: name: app1-service port: name: http - path: /app2 pathType: Prefix backend: service: name: app2-service port: name: http ``` 这个示例中，Ingress定义了两个路由规则：请求到达`example.com/app1`会被转发到名为`app1-service`的服务，而`example.com/app2`则对应`app2-service`。 Ingress Controller的部署和配置也非常重要。它可以通过 Helm 图表、YAML 文件或者直接使用集群的默认Ingress Controller来完成。通常，你需要考虑以下几个方面： - 部署方式：确定是在集群内运行还是作为节点外的服务。 - 配置：设置SSL证书、负载均衡策略、日志记录、健康检查等。 - 扩缩容：根据流量需求调整Controller的副本数量。 - 监控：集成Prometheus、Grafana等工具进行性能监控。 Ingress Controller是Kubernetes集群与外部世界交互的关键组件，通过它可以轻松地管理和控制对内部服务的访问，提供了一种灵活、可扩展的网络解决方案。理解和熟练使用Ingress资源及Controller对于优化Kubernetes应用的网络架构至关重要。

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apiVersion: v1 kind: Namespace metadata: name: ingress-nginx labels: app.kubernetes.io/name: ingress-nginx app.kubernetes.io/instance: ingress-nginx --- # Source: ingress-nginx/templates/controller-serviceaccount.yaml apiVersion: v1 kind: ServiceAccount metadata: labels: helm.sh/chart: ingress-nginx-4.0.15 app.kubernetes.io/name: ingress-nginx app.kubernetes.io/instance: ingress-nginx app.kubernetes.io/version: 1.1.1 app.kubernetes.io/managed-by: Helm app.kubernetes.io/component: controller name: ingress-nginx namespace: ingress-nginx automountServiceAccountToken: true --- # Source: ingress-nginx/templates/controller-configmap.yaml apiVersion: v1 kind: ConfigMap metadata: labels: helm.sh/chart: ingress-nginx-4.0.15 app.kubernetes.io/name: ingress-nginx app.kubernetes.io/instance: ingress-nginx app.kubernetes.io/version: 1.1.1 app.kubernetes.io/managed-by: Helm app.kubernetes.io/component: controller name: ingress-nginx-controller namespace: ingress-nginx data: allow-snippet-annotations: 'true' --- # Source: ingress-nginx/templates/clusterrole.yaml apiVersion: rbac.authorization.k8s.io/v1 kind: ClusterRole metadata: labels: helm.sh/chart: ingress-nginx-4.0.15 app.kubernetes.io/name: ingress-nginx app.kubernetes.io/instance: ingress-nginx app.kubernetes.io/version: 1.1.1 app.kubernetes.io/managed-by: Helm name: ingress-nginx rules: - apiGroups: - '' resources: - configmaps - endpoints - nodes - pods - secrets - namespaces verbs: - list - watch - apiGroups: - '' resources: - nodes verbs: - get - apiGroups: - '' resources: - services verbs: - get - list - watch - apiGroups: - networking.k8s.io resources: - ingresses verbs: - get - list - watch - apiGroups: - '' resources: - events verbs: - create - patch - apiGroups: - networking.k8s.io resources: - ingresses/status verbs: - update - apiGroups: - networking.k8s.io resources: - ingressclasses verbs: - get - list - watch --- # Source: ingress-nginx/templates/clusterrolebinding.yaml apiVersion: rbac.authorization.k8s.io/v1 kind: ClusterRoleBinding metadata: labels: helm.sh/chart: ingress-nginx-4.0.15 app.kubernetes.io/name: ingress-nginx app.kubernetes.io/instance: ingress-nginx app.kubernetes.io/version: 1.1.1 app.kubernetes.io/managed-by: Helm name: ingress-nginx roleRef: apiGroup: rbac.authorization.k8s.io kind: ClusterRole name: ingress-nginx subjects: - kind: ServiceAccount name: ingress-nginx namespace: ingress-nginx --- # Source: ingress-nginx/templates/controller-role.yaml apiVersion: rbac.authorization.k8s.io/v1 kind: Role metadata: labels: helm.sh/chart: ingress-nginx-4.0.15 app.kubernetes.io/name: ingress-nginx app.kubernetes.io/instance: ingress-nginx app.kubernetes.io/version: 1.1.1 app.kubernetes.io/managed-by: Helm app.kubernetes.io/component: controller name: ingress-nginx namespace: ingress-nginx rules: - apiGroups: - '' resources: - namespaces verbs: - get - apiGroups: - '' resources: - configmaps - pods - secrets - endpoints verbs: - get - list - watch - apiGroups: - '' resources: - services verbs: - get - list - watch - apiGroups: - networking.k8s.io resources: - ingresses verbs: - get - list - watch - apiGroups: - networking.k8s.io resources: - ingresses/status verbs: - update - apiGroups: - networking.k8s.io resources: - ingressclasses verbs: - get - list - watch - apiGroups: - '' resources: - configmaps resourceNames: - ingress-controller-leader verbs: - get - update - apiGroups: - '' resources: - configmaps verbs: - create - apiGroups: - '' resources: - events verbs: - create - patch --- # Source: ingress-nginx/templates/controller-rolebinding.yaml apiVersion: rbac.authorization.k8s.io/v1 kind: RoleBinding metadata: labels: helm.sh/chart: ingress-nginx-4.0.15 app.kubernetes.io/name: ingress-nginx app.kubernetes.io/instance: ingress-nginx app.kubernetes.io/version: 1.1.1 app.kubernetes.io/managed-by: Helm app.kubernetes.io/component: controller name: ingress-nginx namespace: ingress-nginx roleRef: apiGroup: rbac.authorization.k8s.io kind: Role name: ingress-nginx subjects: - kind: ServiceAccount name: ingress-nginx namespace: ingress-nginx --- # Source: ingress-nginx/templates/controller-service-webhook.yaml apiVersion: v1 kind: Service metadata: labels: helm.sh/chart: ingress-nginx-4.0.15 app.kubernetes.io/name: ingress-nginx app.kubernetes.io/instance: ingress-nginx app.kubernetes.io/version: 1.1.1 app.kubernetes.io/managed-by: Helm app.kubernetes.io/component: controller name: ingress-nginx-controller-admission namespace: ingress-nginx spec: type: ClusterIP ports: - name: https-webhook port: 443 targetPort: webhook appProtocol: https selector: app.kubernetes.io/name: ingress-nginx app.kubernetes.io/instance: ingress-nginx app.kubernetes.io/component: controller --- # Source: ingress-nginx/templates/controller-service.yaml apiVersion: v1 kind: Service metadata: annotations: labels: helm.sh/chart: ingress-nginx-4.0.15 app.kubernetes.io/name: ingress-nginx app.kubernetes.io/instance: ingress-nginx app.kubernetes.io/version: 1.1.1 app.kubernetes.io/managed-by: Helm app.kubernetes.io/component: controller name: ingress-nginx-controller namespace: ingress-nginx spec: type: LoadBalancer externalTrafficPolicy: Local ipFamilyPolicy: SingleStack ipFamilies: - IPv4 ports: - name: http port: 80 protocol: TCP targetPort: http appProtocol: http - name: https port: 443 protocol: TCP targetPort: https appProtocol: https selector: app.kubernetes.io/name: ingress-nginx app.kubernetes.io/instance: ingress-nginx app.kubernetes.io/component: controller --- # Source: ingress-nginx/templates/controller-deployment.yaml apiVersion: apps/v1 kind: Deployment metadata: labels: helm.sh/chart: ingress-nginx-4.0.15 app.kubernetes.io/name: ingress-nginx app.kubernetes.io/instance: ingress-nginx app.kubernetes.io/version: 1.1.1 app.kubernetes.io/managed-by: Helm app.kubernetes.io/component: controller name: ingress-nginx-controller namespace: ingress-nginx spec: selector: matchLabels: app.kubernetes.io/name: ingress-nginx app.kubernetes.io/instance: ingress-nginx app.kubernetes.io/component: controller revisionHistoryLimit: 10 minReadySeconds: 0 template: metadata: labels: app.kubernetes.io/name: ingress-nginx app.kubernetes.io/instance: ingress-nginx app.kubernetes.io/component: controller spec: dnsPolicy: ClusterFirst containers: - name: controller image: anjia0532/google-containers.ingress-nginx.controller:v1.1.1 imagePullPolicy: IfNotPresent lifecycle: preStop: exec: command: - /wait-