1 Ingress基本概念
1.1 为何需要Ingress
使用NodePort类型的Service可以将集群内部服务暴露给集群外部客户端，但使用这种类型Service存在如下几个问题:
- 一个端口只能一个服务使用，所有通过NodePort暴露的端口都需要提前规划;
- 如果通过NodePort暴露端口过多，后期维护成本太大，且不易于管理;
- 目前Service底层使用的Iptables、IPVS，仅支持四层协议，无法完成https协议传输;
kubernetes为了解决这个需求，提供了一种高级的流量管理，也就是Ingress和Ingress控制器，kubernetes使用Ingress控制器来接收所有入口的流量，然后通过Ingress资源来定义流量如何区分，以及流量如何转发的规则。
有了Ingress和Ingress控制器，我们就可以直接定义流量转发规则来发布服务，而无需创建一堆的NodePort和LoadBalancer类型的Service。
Ingress官网定义：Ingress可以把进入到集群内部的请求转发到集群中的一些服务上，从而可以把服务映射到集群外部。Ingress能把集群内Service配置成外网能够访问的URL，流量负载均衡，提供基于域名访问的虚拟主机等。
Ingress简单的理解就是你原来需要改Nginx配置，然后配置各种域名对应哪个Service，现在把这个动作抽象出来，变成一个Ingress对象，你可以用yaml创建，每次不要去改Nginx了，直接改yaml 然后创建/更新就行了；那么问题来了：”Nginx该怎么处理？”
Ingress Controller这东西就是解决 “Nginx的处理方式” 的；Ingress Controller通过与 Kubernetes API交互，动态的去感知集群中Ingress规则变化，然后读取它，按照他自己模板生成一段Nginx 配置，再写到Ingress Controller Nginx里，最后reload一下
1.2 什么是Ingress
Ingress其实就是Kubernetes中的一种资源，它主要是用来定义流量转发规则。但Ingress资源本身并不能实现流量的转发和调度，它仅仅是一组流量路由的规则集合，这些规则要真正发挥作用还需要使用到Ingress控制器，由Ingress控制器读取对应的Ingress规则，然后完成流量的路由或转发。
通过配置，Ingress可为Service提供外部可访问的URL、对其流量作负载均衡、 终止SSL/TLS，以及基于名称的虚拟托管等能力。Ingress控制器负责完成Ingress的工作，具体实现上通常会使用某个负载均衡器，不过也可以配置边缘路由器或其他前端来帮助处理流量。
Ingress不会随意公开端口或协议。将HTTP和HTTPS以外的服务开放到Internet 时，通常使用Service.Type=NodePort或Service.Type=LoadBalancer类型的Service。
1.3 Ingress Controller
Ingress Controller是一个七层负载均衡调度器，客户端的请求先到达这个七层负载均衡调度器， 由七层负载均衡器在反向代理到后端pod，常见的七层负载均衡器有nginx、traefik，以我们熟悉的nginx为例，假如请求到达nginx，会通过upstream反向代理到后端pod应用，但是后端pod的ip地址是一直在变化的，因此在后端pod前需要加一个service，这个service只是起到分组的作用，那么我们upstream只需要填写service地址即可。
Ingress Controller就是一类以代理HTTP/HTTPS协议为主的代理程序。Ingress Controller通过Pod的形式运行在Kubernetes集群上，它能够与集群上的Pod直接通信。这样就可以让用户的流量经过Ingress控制器时直接调度到对应的Pod上。
Ingress Controller类似Nginx服务，它负责读取Ingress的规则，然后将规则转换为nginx.conf配置文件，这样就可以根据对应的规则来实现流量的调度。同时它还会实时感知后端Service对应的Pod变化，当Pod发生变动时，Ingress控制器会再次结合Ingress的规则，进而完成对应的配置动态更新。
注意: 使用Ingress资源进行流量分发时，Ingress控制器可基于Ingress定义的规则将客户端的请求流量直接转发至Service对应的后端Pod资源上，比如: 用户请求api.zhangsan.net，Ingress控制器依据对应的规则直接将请求流量调度至Pod3或者Pod4，而无需经过Service对象转发。
1.4 Ingress和Ingress Controller总结
Ingress Controller可以理解为控制器，它通过不断的跟Kubernetes API交互，实时获取后端 Service、Pod的变化，比如新增、删除等，结合Ingress定义的规则生成配置，然后动态更新上边的Nginx或者trafik负载均衡器，并刷新使配置生效，来达到服务自动发现的作用。
Ingress则是定义规则，通过它定义某个域名的请求过来之后转发到集群中指定的Service。它可以通过Yaml文件定义，可以给一个或多个Service 定义一个或多个Ingress规则。
1.5使用Ingress Controller代理k8s内部应用的流程
(1)ingress-controller通过和 kubernetes APIServer 交互，动态的去感知集群中ingress规则变化；
(2)然后读取它，按照自定义的规则，规则就是写明了哪个域名对应哪个service，生成一段nginx配置；
(3)再写到nginx-ingress-controller的pod里，这个ingress-controller的pod里运行着一个Nginx服务，控制器会把生成的 nginx配置写入 /etc/nginx.conf文件中；
(4)然后reload一下使配置生效。以此达到域名区分配置和动态更新的作用；
客户端通过七层调度器访问后端pod的方式
2 IngressController部署方案
2.1 DaemonSet+HostNetwork+nodeSelector
用DaemonSet结合nodeselector来部署ingress-controller到特定的node上，然后使用HostNetwork直接把该pod与宿主机node的网络打通，直接使用宿主机的80/443端口就能访问服务。这时，ingress-controller所在的node机器就很类似传统架构的边缘节点，比如机房入口的nginx服务器。该方式整个请求链路最简单，性能相对NodePort模式更好。缺点是由于直接利用宿主机节点的网络和端口，一个node只能部署一个ingress-controller pod。 比较适合大并发的生产环境使用。
apiVersion: apps/v1
kind: DaemonSet
spec:template:spec:hostNetwork: truednsPolicy: ClusterFirstWithHostNetnodeSelector:kubernetes.io/os: linuxnode-role: ingresscontainers:- name: controllerimage: registry.cn-hangzhou.aliyuncs.com/google_containers/nginx-ingress-controller:v1.1.0hostNetwork 是一种 Pod 配置选项，它允许 Pod 直接使用主机的网络命名空间。这意味着 Pod 中的容器可以与主机上的其他进程共享网络栈和网络接口，从而使 Pod 能够直接访问主机的网络资源。但是要注意，使用 hostNetwork 可能会导致网络隔离性的降低，因为 Pod 中的容器与主机上的其他容器共享相同的网络环境。
2.2 Deployment+HostNetwork+nodeSelector+pod反亲和性
用Deployment结合nodeselector、pod反亲和性来部署ingress-controller到特定的node上，并且保证了每个node只部署一个服务，然后使用HostNetwork直接把该pod与宿主机node的网络打通，直接使用宿主机的80/443端口就能访问服务。
apiVersion: apps/v1
kind: Deployment
spec:replicas: 2template:spec:hostNetwork: truednsPolicy: ClusterFirstWithHostNetnodeSelector:kubernetes.io/os: linuxnode-role: ingressaffinity:podAntiAffinity:preferredDuringSchedulingIgnoredDuringExecution:- weight: 100podAffinityTerm:labelSelector:matchLabels:app.kubernetes.io/name: ingress-nginxtopologyKey: kubernetes.io/hostnamecontainers:- name: controllerimage: registry.cn-hangzhou.aliyuncs.com/google_containers/nginx-ingress-controller:v1.1.02.3 IngressController高可用方案
上面两种方案都配置了HostNetwork，外面配置nginx+keepalived即可实现高可用
配置vip和域名映射，访问VIP:PORT实现跳转到node:80端口上upstream k8s-apiserver {server nodeSelector01:80;server nodeSelector02:80;}server {listen 30080;proxy_pass k8s-apiserver;}2.4 多套IngressController
如果一套k8s集群，想要部署几套ingress，并且相互不干扰
主要参数设置：
containers:
- name: nginx-ingress-controllerimage: registry.cn-hangzhou.aliyuncs.com/google_containers/nginx-ingress-controller:v1.1.0args:- /nginx-ingress-controller- --ingress-class=ngx-ds01注意：--ingress-class设置该Ingress Controller可监听的目标Ingress Class标识；注意：同一个集群中不同套Ingress Controller监听的Ingress Class标识必须唯一，且不能设置为nginx关键字(其是集群默认Ingress Controller的监听标识)；
创建 Ingress 规则：
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:name: ingress-myappnamespace: defaultannotations:kubernetes.io/ingress.class: "ngx-ds01"
spec:2.5 IngressController部署
使用Deployment+HostNetwork+nodeSelector+pod反亲和性方式进行部署
apiVersion: v1
kind: Namespace
metadata:name: ingress-nginxlabels:app.kubernetes.io/name: ingress-nginxapp.kubernetes.io/instance: ingress-nginx---
# Source: ingress-nginx/templates/controller-serviceaccount.yaml
apiVersion: v1
kind: ServiceAccount
metadata:labels:helm.sh/chart: ingress-nginx-4.0.10app.kubernetes.io/name: ingress-nginxapp.kubernetes.io/instance: ingress-nginxapp.kubernetes.io/version: 1.1.0app.kubernetes.io/managed-by: Helmapp.kubernetes.io/component: controllername: ingress-nginxnamespace: ingress-nginx
automountServiceAccountToken: true
---
# Source: ingress-nginx/templates/controller-configmap.yaml
apiVersion: v1
kind: ConfigMap
metadata:labels:helm.sh/chart: ingress-nginx-4.0.10app.kubernetes.io/name: ingress-nginxapp.kubernetes.io/instance: ingress-nginxapp.kubernetes.io/version: 1.1.0app.kubernetes.io/managed-by: Helmapp.kubernetes.io/component: controllername: ingress-nginx-controllernamespace: 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-4.0.10app.kubernetes.io/name: ingress-nginxapp.kubernetes.io/instance: ingress-nginxapp.kubernetes.io/version: 1.1.0app.kubernetes.io/managed-by: Helmname: ingress-nginx
rules:- apiGroups:- ''resources:- configmaps- endpoints- nodes- pods- secrets- namespacesverbs:- list- watch- apiGroups:- ''resources:- nodesverbs:- get- apiGroups:- ''resources:- servicesverbs:- get- list- watch- apiGroups:- networking.k8s.ioresources:- ingressesverbs:- get- list- watch- apiGroups:- ''resources:- eventsverbs:- create- patch- apiGroups:- networking.k8s.ioresources:- ingresses/statusverbs:- update- apiGroups:- networking.k8s.ioresources:- ingressclassesverbs:- get- list- watch
---
# Source: ingress-nginx/templates/clusterrolebinding.yaml
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:labels:helm.sh/chart: ingress-nginx-4.0.10app.kubernetes.io/name: ingress-nginxapp.kubernetes.io/instance: ingress-nginxapp.kubernetes.io/version: 1.1.0app.kubernetes.io/managed-by: Helmname: ingress-nginx
roleRef:apiGroup: rbac.authorization.k8s.iokind: ClusterRolename: ingress-nginx
subjects:- kind: ServiceAccountname: ingress-nginxnamespace: ingress-nginx
---
# Source: ingress-nginx/templates/controller-role.yaml
apiVersion: rbac.authorization.k8s.io/v1
kind: Role
metadata:labels:helm.sh/chart: ingress-nginx-4.0.10app.kubernetes.io/name: ingress-nginxapp.kubernetes.io/instance: ingress-nginxapp.kubernetes.io/version: 1.1.0app.kubernetes.io/managed-by: Helmapp.kubernetes.io/component: controllername: ingress-nginxnamespace: ingress-nginx
rules:- apiGroups:- ''resources:- namespacesverbs:- get- apiGroups:- ''resources:- configmaps- pods- secrets- endpointsverbs:- get- list- watch- apiGroups:- ''resources:- servicesverbs:- get- list- watch- apiGroups:- networking.k8s.ioresources:- ingressesverbs:- get- list- watch- apiGroups:- networking.k8s.ioresources:- ingresses/statusverbs:- update- apiGroups:- networking.k8s.ioresources:- ingressclassesverbs:- get- list- watch- apiGroups:- ''resources:- configmapsresourceNames:- ingress-controller-leaderverbs:- get- update- apiGroups:- ''resources:- configmapsverbs:- create- apiGroups:- ''resources:- eventsverbs:- create- patch
---
# Source: ingress-nginx/templates/controller-rolebinding.yaml
apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:labels:helm.sh/chart: ingress-nginx-4.0.10app.kubernetes.io/name: ingress-nginxapp.kubernetes.io/instance: ingress-nginxapp.kubernetes.io/version: 1.1.0app.kubernetes.io/managed-by: Helmapp.kubernetes.io/component: controllername: ingress-nginxnamespace: ingress-nginx
roleRef:apiGroup: rbac.authorization.k8s.iokind: Rolename: ingress-nginx
subjects:- kind: ServiceAccountname: ingress-nginxnamespace: ingress-nginx
---
# Source: ingress-nginx/templates/controller-service-webhook.yaml
apiVersion: v1
kind: Service
metadata:labels:helm.sh/chart: ingress-nginx-4.0.10app.kubernetes.io/name: ingress-nginxapp.kubernetes.io/instance: ingress-nginxapp.kubernetes.io/version: 1.1.0app.kubernetes.io/managed-by: Helmapp.kubernetes.io/component: controllername: ingress-nginx-controller-admissionnamespace: ingress-nginx
spec:type: ClusterIPports:- name: https-webhookport: 443targetPort: webhookappProtocol: httpsselector:app.kubernetes.io/name: ingress-nginxapp.kubernetes.io/instance: ingress-nginxapp.kubernetes.io/component: controller
---
# Source: ingress-nginx/templates/controller-service.yaml
apiVersion: v1
kind: Service
metadata:annotations:labels:helm.sh/chart: ingress-nginx-4.0.10app.kubernetes.io/name: ingress-nginxapp.kubernetes.io/instance: ingress-nginxapp.kubernetes.io/version: 1.1.0app.kubernetes.io/managed-by: Helmapp.kubernetes.io/component: controllername: ingress-nginx-controllernamespace: ingress-nginx
spec:type: NodePortipFamilyPolicy: SingleStackipFamilies:- IPv4ports:- name: httpport: 80protocol: TCPtargetPort: httpappProtocol: http- name: httpsport: 443protocol: TCPtargetPort: httpsappProtocol: httpsselector:app.kubernetes.io/name: ingress-nginxapp.kubernetes.io/instance: ingress-nginxapp.kubernetes.io/component: controller
---
# Source: ingress-nginx/templates/controller-deployment.yaml
apiVersion: apps/v1
kind: Deployment
metadata:labels:helm.sh/chart: ingress-nginx-4.0.10app.kubernetes.io/name: ingress-nginxapp.kubernetes.io/instance: ingress-nginxapp.kubernetes.io/version: 1.1.0app.kubernetes.io/managed-by: Helmapp.kubernetes.io/component: controllername: ingress-nginx-controllernamespace: ingress-nginx
spec:#replicas: 2selector:matchLabels:app.kubernetes.io/name: ingress-nginxapp.kubernetes.io/instance: ingress-nginxapp.kubernetes.io/component: controllerrevisionHistoryLimit: 10minReadySeconds: 0template:metadata:labels:app.kubernetes.io/name: ingress-nginxapp.kubernetes.io/instance: ingress-nginxapp.kubernetes.io/component: controllerspec:hostNetwork: trueaffinity:podAntiAffinity:preferredDuringSchedulingIgnoredDuringExecution:- weight: 100podAffinityTerm:labelSelector:matchLabels:app.kubernetes.io/name: ingress-nginxtopologyKey: kubernetes.io/hostnamednsPolicy: ClusterFirstWithHostNetcontainers:- name: controllerimage: registry.cn-hangzhou.aliyuncs.com/google_containers/nginx-ingress-controller:v1.1.0imagePullPolicy: IfNotPresentlifecycle:preStop:exec:command:- /wait-shutdownargs:- /nginx-ingress-controller- --election-id=ingress-controller-leader- --controller-class=k8s.io/ingress-nginx- --configmap=$(POD_NAMESPACE)/ingress-nginx-controller- --validating-webhook=:8443- --validating-webhook-certificate=/usr/local/certificates/cert- --validating-webhook-key=/usr/local/certificates/keysecurityContext:capabilities:drop:- ALLadd:- NET_BIND_SERVICErunAsUser: 101allowPrivilegeEscalation: trueenv:- name: POD_NAMEvalueFrom:fieldRef:fieldPath: metadata.name- name: POD_NAMESPACEvalueFrom:fieldRef:fieldPath: metadata.namespace- name: LD_PRELOADvalue: /usr/local/lib/libmimalloc.solivenessProbe:failureThreshold: 5httpGet:path: /healthzport: 10254scheme: HTTPinitialDelaySeconds: 10periodSeconds: 10successThreshold: 1timeoutSeconds: 1readinessProbe:failureThreshold: 3httpGet:path: /healthzport: 10254scheme: HTTPinitialDelaySeconds: 10periodSeconds: 10successThreshold: 1timeoutSeconds: 1ports:- name: httpcontainerPort: 80protocol: TCP- name: httpscontainerPort: 443protocol: TCP- name: webhookcontainerPort: 8443protocol: TCPvolumeMounts:- name: webhook-certmountPath: /usr/local/certificates/readOnly: trueresources:requests:cpu: 100mmemory: 90MinodeSelector:kubernetes.io/os: linuxnode-role: ingressserviceAccountName: ingress-nginxterminationGracePeriodSeconds: 300volumes:- name: webhook-certsecret:secretName: ingress-nginx-admission
---
# Source: ingress-nginx/templates/controller-ingressclass.yaml
# We don't support namespaced ingressClass yet
# So a ClusterRole and a ClusterRoleBinding is required
apiVersion: networking.k8s.io/v1
kind: IngressClass
metadata:labels:helm.sh/chart: ingress-nginx-4.0.10app.kubernetes.io/name: ingress-nginxapp.kubernetes.io/instance: ingress-nginxapp.kubernetes.io/version: 1.1.0app.kubernetes.io/managed-by: Helmapp.kubernetes.io/component: controllername: nginxnamespace: ingress-nginx
spec:controller: k8s.io/ingress-nginx
---
# Source: ingress-nginx/templates/admission-webhooks/validating-webhook.yaml
# before changing this value, check the required kubernetes version
# https://kubernetes.io/docs/reference/access-authn-authz/extensible-admission-controllers/#prerequisites
apiVersion: admissionregistration.k8s.io/v1
kind: ValidatingWebhookConfiguration
metadata:labels:helm.sh/chart: ingress-nginx-4.0.10app.kubernetes.io/name: ingress-nginxapp.kubernetes.io/instance: ingress-nginxapp.kubernetes.io/version: 1.1.0app.kubernetes.io/managed-by: Helmapp.kubernetes.io/component: admission-webhookname: ingress-nginx-admission
webhooks:- name: validate.nginx.ingress.kubernetes.iomatchPolicy: Equivalentrules:- apiGroups:- networking.k8s.ioapiVersions:- v1operations:- CREATE- UPDATEresources:- ingressesfailurePolicy: FailsideEffects: NoneadmissionReviewVersions:- v1clientConfig:service:namespace: ingress-nginxname: ingress-nginx-controller-admissionpath: /networking/v1/ingresses
---
# Source: ingress-nginx/templates/admission-webhooks/job-patch/serviceaccount.yaml
apiVersion: v1
kind: ServiceAccount
metadata:name: ingress-nginx-admissionnamespace: ingress-nginxannotations:helm.sh/hook: pre-install,pre-upgrade,post-install,post-upgradehelm.sh/hook-delete-policy: before-hook-creation,hook-succeededlabels:helm.sh/chart: ingress-nginx-4.0.10app.kubernetes.io/name: ingress-nginxapp.kubernetes.io/instance: ingress-nginxapp.kubernetes.io/version: 1.1.0app.kubernetes.io/managed-by: Helmapp.kubernetes.io/component: admission-webhook
---
# Source: ingress-nginx/templates/admission-webhooks/job-patch/clusterrole.yaml
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:name: ingress-nginx-admissionannotations:helm.sh/hook: pre-install,pre-upgrade,post-install,post-upgradehelm.sh/hook-delete-policy: before-hook-creation,hook-succeededlabels:helm.sh/chart: ingress-nginx-4.0.10app.kubernetes.io/name: ingress-nginxapp.kubernetes.io/instance: ingress-nginxapp.kubernetes.io/version: 1.1.0app.kubernetes.io/managed-by: Helmapp.kubernetes.io/component: admission-webhook
rules:- apiGroups:- admissionregistration.k8s.ioresources:- validatingwebhookconfigurationsverbs:- get- update
---
# Source: ingress-nginx/templates/admission-webhooks/job-patch/clusterrolebinding.yaml
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:name: ingress-nginx-admissionannotations:helm.sh/hook: pre-install,pre-upgrade,post-install,post-upgradehelm.sh/hook-delete-policy: before-hook-creation,hook-succeededlabels:helm.sh/chart: ingress-nginx-4.0.10app.kubernetes.io/name: ingress-nginxapp.kubernetes.io/instance: ingress-nginxapp.kubernetes.io/version: 1.1.0app.kubernetes.io/managed-by: Helmapp.kubernetes.io/component: admission-webhook
roleRef:apiGroup: rbac.authorization.k8s.iokind: ClusterRolename: ingress-nginx-admission
subjects:- kind: ServiceAccountname: ingress-nginx-admissionnamespace: ingress-nginx
---
# Source: ingress-nginx/templates/admission-webhooks/job-patch/role.yaml
apiVersion: rbac.authorization.k8s.io/v1
kind: Role
metadata:name: ingress-nginx-admissionnamespace: ingress-nginxannotations:helm.sh/hook: pre-install,pre-upgrade,post-install,post-upgradehelm.sh/hook-delete-policy: before-hook-creation,hook-succeededlabels:helm.sh/chart: ingress-nginx-4.0.10app.kubernetes.io/name: ingress-nginxapp.kubernetes.io/instance: ingress-nginxapp.kubernetes.io/version: 1.1.0app.kubernetes.io/managed-by: Helmapp.kubernetes.io/component: admission-webhook
rules:- apiGroups:- ''resources:- secretsverbs:- get- create
---
# Source: ingress-nginx/templates/admission-webhooks/job-patch/rolebinding.yaml
apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:name: ingress-nginx-admissionnamespace: ingress-nginxannotations:helm.sh/hook: pre-install,pre-upgrade,post-install,post-upgradehelm.sh/hook-delete-policy: before-hook-creation,hook-succeededlabels:helm.sh/chart: ingress-nginx-4.0.10app.kubernetes.io/name: ingress-nginxapp.kubernetes.io/instance: ingress-nginxapp.kubernetes.io/version: 1.1.0app.kubernetes.io/managed-by: Helmapp.kubernetes.io/component: admission-webhook
roleRef:apiGroup: rbac.authorization.k8s.iokind: Rolename: ingress-nginx-admission
subjects:- kind: ServiceAccountname: ingress-nginx-admissionnamespace: ingress-nginx
---
# Source: ingress-nginx/templates/admission-webhooks/job-patch/job-createSecret.yaml
apiVersion: batch/v1
kind: Job
metadata:name: ingress-nginx-admission-createnamespace: ingress-nginxannotations:helm.sh/hook: pre-install,pre-upgradehelm.sh/hook-delete-policy: before-hook-creation,hook-succeededlabels:helm.sh/chart: ingress-nginx-4.0.10app.kubernetes.io/name: ingress-nginxapp.kubernetes.io/instance: ingress-nginxapp.kubernetes.io/version: 1.1.0app.kubernetes.io/managed-by: Helmapp.kubernetes.io/component: admission-webhook
spec:template:metadata:name: ingress-nginx-admission-createlabels:helm.sh/chart: ingress-nginx-4.0.10app.kubernetes.io/name: ingress-nginxapp.kubernetes.io/instance: ingress-nginxapp.kubernetes.io/version: 1.1.0app.kubernetes.io/managed-by: Helmapp.kubernetes.io/component: admission-webhookspec:containers:- name: createimage: registry.cn-hangzhou.aliyuncs.com/google_containers/kube-webhook-certgen:v1.1.1imagePullPolicy: IfNotPresentargs:- create- --host=ingress-nginx-controller-admission,ingress-nginx-controller-admission.$(POD_NAMESPACE).svc- --namespace=$(POD_NAMESPACE)- --secret-name=ingress-nginx-admissionenv:- name: POD_NAMESPACEvalueFrom:fieldRef:fieldPath: metadata.namespacesecurityContext:allowPrivilegeEscalation: falserestartPolicy: OnFailureserviceAccountName: ingress-nginx-admissionnodeSelector:kubernetes.io/os: linuxsecurityContext:runAsNonRoot: truerunAsUser: 2000
---
# Source: ingress-nginx/templates/admission-webhooks/job-patch/job-patchWebhook.yaml
apiVersion: batch/v1
kind: Job
metadata:name: ingress-nginx-admission-patchnamespace: ingress-nginxannotations:helm.sh/hook: post-install,post-upgradehelm.sh/hook-delete-policy: before-hook-creation,hook-succeededlabels:helm.sh/chart: ingress-nginx-4.0.10app.kubernetes.io/name: ingress-nginxapp.kubernetes.io/instance: ingress-nginxapp.kubernetes.io/version: 1.1.0app.kubernetes.io/managed-by: Helmapp.kubernetes.io/component: admission-webhook
spec:template:metadata:name: ingress-nginx-admission-patchlabels:helm.sh/chart: ingress-nginx-4.0.10app.kubernetes.io/name: ingress-nginxapp.kubernetes.io/instance: ingress-nginxapp.kubernetes.io/version: 1.1.0app.kubernetes.io/managed-by: Helmapp.kubernetes.io/component: admission-webhookspec:containers:- name: patchimage: registry.cn-hangzhou.aliyuncs.com/google_containers/kube-webhook-certgen:v1.1.1imagePullPolicy: IfNotPresentargs:- patch- --webhook-name=ingress-nginx-admission- --namespace=$(POD_NAMESPACE)- --patch-mutating=false- --secret-name=ingress-nginx-admission- --patch-failure-policy=Failenv:- name: POD_NAMESPACEvalueFrom:fieldRef:fieldPath: metadata.namespacesecurityContext:allowPrivilegeEscalation: falserestartPolicy: OnFailureserviceAccountName: ingress-nginx-admissionnodeSelector:kubernetes.io/os: linuxsecurityContext:runAsNonRoot: truerunAsUser: 2000为节点打标签
kubectl label node k8s02 node-role=ingress
3 Ingress快速入门实践
3.1 Ingress资源清单
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:name:namespace:
spec:ingressClassName: "nginx" #适配Ingress控制器类别，必须明确指明rules: #Igrss规则列表- host: #虚拟主机的QD，俗h域名http:paths: #虚主机ah定义的列，由ahbackend#成- path: #匹配以什么开头，类似nginx的location用pathype: #Prefix前缀匹配，不区分大小写，Exact精准匹配URL，区分大写backend:service: #关联的后端Servicename: #后端Service名成port: number: #Service端口号3.2 Ingress发布业务
编写Ingress规则，将之前的guestBooks业务通过域名方式发布。
vim guestbooks_ingress.yaml
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:name: guestbooks-ingressnamespace: default
spec:ingressClassName: "nginx"rules:- host: guestbook.ingress.nethttp:paths:- path: /pathType: Prefixbackend:service:name: guestbooksport:number: 80
3.3 客户端测试访问
修改电脑本地的host文件，增加如下一行，下面的ip是k8s的k8s02节点ip
192.168.137.142 guestbook.ingress.net
访问guestbook.ingress.net
