环境基于centos7.9
k8s-1.22.x
ingress-1.4.0

1. Ingress Yaml安装

There are multiple ways to install the Ingress-Nginx Controller:
with Helm, using the project repository chart;
with kubectl apply, using YAML manifests;
with specific addons (e.g. for minikube or MicroK8s).

安装Ingress-nginx控制器；
使⽤daemonSet⽅式部署，但需要通过nodeSelect来选择⼏个节点安装，并⾮所有节点都需要；
将Pod的端⼝与节点共享⽹络名称空间；设定为HostNetwork；

1.1 下载ingress文件

部署地址：https://github.com/kubernetes/ingress-nginx

bash

#云
wget https://raw.githubusercontent.com/kubernetes/ingress-nginx/controller-v1.4.0/deploy/static/provider/cloud/deploy.yaml

# 非云环境
https://raw.githubusercontent.com/kubernetes/ingress-nginx/controller-v1.4.0/deploy/static/provider/baremetal/deploy.yaml

#云
wget https://raw.githubusercontent.com/kubernetes/ingress-nginx/controller-v1.4.0/deploy/static/provider/cloud/deploy.yaml

# 非云环境
https://raw.githubusercontent.com/kubernetes/ingress-nginx/controller-v1.4.0/deploy/static/provider/baremetal/deploy.yaml

1.2 修改配置

yaml


kind: Daemonset #⽤DaemonSet确保每个节点都部署Ingress

type: NodePort

image:
registry.cn-hangzhou.aliyuncs.com/google_containers/nginx-ingress-controller:v1.4.0
registry.cn-zhangjiakou.aliyuncs.com/hsuing/kube-webhook-certgen:v20220916-gd32f8c343

去掉digtest 验证
      dnsPolicy: ClusterFirstWithHostNet # 优先使⽤集群内的DNS解析服务
      hostNetwork: true # 使⽤主机网络
      nodeSelector: ## 节点选择器（选择哪些节点部署Ingress，默认所有）
        node-role: ingress ## 如果节点有node-role=ingress 并且os=linux的标签，则在节点上运⾏Ingress Pod


kind: Daemonset #⽤DaemonSet确保每个节点都部署Ingress

type: NodePort

image:
registry.cn-hangzhou.aliyuncs.com/google_containers/nginx-ingress-controller:v1.4.0
registry.cn-zhangjiakou.aliyuncs.com/hsuing/kube-webhook-certgen:v20220916-gd32f8c343

去掉digtest 验证
      dnsPolicy: ClusterFirstWithHostNet # 优先使⽤集群内的DNS解析服务
      hostNetwork: true # 使⽤主机网络
      nodeSelector: ## 节点选择器（选择哪些节点部署Ingress，默认所有）
        node-role: ingress ## 如果节点有node-role=ingress 并且os=linux的标签，则在节点上运⾏Ingress Pod

1.3 为节点打标签

shell

#查看node
[root@kube-master ingress-nginx]# kubectl get node
NAME           STATUS   ROLES                  AGE   VERSION
k8s-master01   Ready    control-plane,master   40d   v1.22.17
kube-node01    Ready    <none>                 38d   v1.22.17
kube-node02    Ready    <none>                 39d   v1.22.17
kube-node03    Ready    <none>                 39d   v1.22.17

#为节点打上对应标签，否则Ingress⽆法正常调度到指定的节点运⾏
[root@kube-master ingress-nginx]# kubectl label nodes kube-node01 node-role=ingress
node/kube-node01 labeled

[root@kube-master ingress-nginx]# kubectl label nodes kube-node02 node-role=ingress
node/kube-node02 labeled

#查看node
[root@kube-master ingress-nginx]# kubectl get node
NAME           STATUS   ROLES                  AGE   VERSION
k8s-master01   Ready    control-plane,master   40d   v1.22.17
kube-node01    Ready    <none>                 38d   v1.22.17
kube-node02    Ready    <none>                 39d   v1.22.17
kube-node03    Ready    <none>                 39d   v1.22.17

#为节点打上对应标签，否则Ingress⽆法正常调度到指定的节点运⾏
[root@kube-master ingress-nginx]# kubectl label nodes kube-node01 node-role=ingress
node/kube-node01 labeled

[root@kube-master ingress-nginx]# kubectl label nodes kube-node02 node-role=ingress
node/kube-node02 labeled

1.4 创建ingress

shell

[root@kube-master ingress-nginx]# kubectl apply  -f deploy-1.4.0.yaml
namespace/ingress-nginx unchanged
serviceaccount/ingress-nginx unchanged
serviceaccount/ingress-nginx-admission unchanged
role.rbac.authorization.k8s.io/ingress-nginx unchanged
role.rbac.authorization.k8s.io/ingress-nginx-admission unchanged
clusterrole.rbac.authorization.k8s.io/ingress-nginx unchanged
clusterrole.rbac.authorization.k8s.io/ingress-nginx-admission unchanged
rolebinding.rbac.authorization.k8s.io/ingress-nginx unchanged
rolebinding.rbac.authorization.k8s.io/ingress-nginx-admission unchanged
clusterrolebinding.rbac.authorization.k8s.io/ingress-nginx unchanged
clusterrolebinding.rbac.authorization.k8s.io/ingress-nginx-admission unchanged
configmap/ingress-nginx-controller unchanged
service/ingress-nginx-controller created
service/ingress-nginx-controller-admission unchanged
daemonset.apps/ingress-nginx-controller configured
job.batch/ingress-nginx-admission-create unchanged
job.batch/ingress-nginx-admission-patch unchanged
ingressclass.networking.k8s.io/nginx unchanged
validatingwebhookconfiguration.admissionregistration.k8s.io/ingress-nginx-admission configured

[root@kube-master ingress-nginx]# kubectl apply  -f deploy-1.4.0.yaml
namespace/ingress-nginx unchanged
serviceaccount/ingress-nginx unchanged
serviceaccount/ingress-nginx-admission unchanged
role.rbac.authorization.k8s.io/ingress-nginx unchanged
role.rbac.authorization.k8s.io/ingress-nginx-admission unchanged
clusterrole.rbac.authorization.k8s.io/ingress-nginx unchanged
clusterrole.rbac.authorization.k8s.io/ingress-nginx-admission unchanged
rolebinding.rbac.authorization.k8s.io/ingress-nginx unchanged
rolebinding.rbac.authorization.k8s.io/ingress-nginx-admission unchanged
clusterrolebinding.rbac.authorization.k8s.io/ingress-nginx unchanged
clusterrolebinding.rbac.authorization.k8s.io/ingress-nginx-admission unchanged
configmap/ingress-nginx-controller unchanged
service/ingress-nginx-controller created
service/ingress-nginx-controller-admission unchanged
daemonset.apps/ingress-nginx-controller configured
job.batch/ingress-nginx-admission-create unchanged
job.batch/ingress-nginx-admission-patch unchanged
ingressclass.networking.k8s.io/nginx unchanged
validatingwebhookconfiguration.admissionregistration.k8s.io/ingress-nginx-admission configured

❌ 注意

报错，The Service "ingress-nginx-controller" is invalid: spec.externalTrafficPolicy: Invalid value: "Local": ExternalTrafficPolicy can onlybe set on NodePort and LoadBalancer service

To resolve this issue, you need to make sure that the externalTrafficPolicy field is only set for NodePort or LoadBalancer

查看

shell

[root@kube-master ingress]# kubectl get pod,svc,ds -n ingress-nginx
pod/ingress-nginx-admission-create-c799q   0/1     Completed   0          2d1h
pod/ingress-nginx-admission-patch-wzm82    0/1     Completed   0          2d1h
pod/ingress-nginx-controller-gcv4v         1/1     Running     0          3h39m
pod/ingress-nginx-controller-hs58n         1/1     Running     0          3h39m

NAME                                         TYPE        CLUSTER-IP        EXTERNAL-IP   PORT(S)                      AGE
service/ingress-nginx-controller             NodePort    192.168.104.132   <none>        80:31592/TCP,443:31125/TCP   2d
service/ingress-nginx-controller-admission   ClusterIP   192.168.53.76     <none>        443/TCP                      2d1h

NAME                                      DESIRED   CURRENT   READY   UP-TO-DATE   AVAILABLE   NODE SELECTOR    AGE
daemonset.apps/ingress-nginx-controller   2         2         2       2            2           kubernetes.io/os=linux,node-role=ingress   2d1h

[root@kube-master ingress]# kubectl get pod,svc,ds -n ingress-nginx
pod/ingress-nginx-admission-create-c799q   0/1     Completed   0          2d1h
pod/ingress-nginx-admission-patch-wzm82    0/1     Completed   0          2d1h
pod/ingress-nginx-controller-gcv4v         1/1     Running     0          3h39m
pod/ingress-nginx-controller-hs58n         1/1     Running     0          3h39m

NAME                                         TYPE        CLUSTER-IP        EXTERNAL-IP   PORT(S)                      AGE
service/ingress-nginx-controller             NodePort    192.168.104.132   <none>        80:31592/TCP,443:31125/TCP   2d
service/ingress-nginx-controller-admission   ClusterIP   192.168.53.76     <none>        443/TCP                      2d1h

NAME                                      DESIRED   CURRENT   READY   UP-TO-DATE   AVAILABLE   NODE SELECTOR    AGE
daemonset.apps/ingress-nginx-controller   2         2         2       2            2           kubernetes.io/os=linux,node-role=ingress   2d1h

pod介绍

ingress-nginx-controllerService：这个Service负责将请求转发到ingress-nginx-controller Pods。它通常会将流量分发到ingress-nginx-controller的多个副本中，并确保副本集的负载平衡。这个Service可以被配置为使用NodePort、LoadBalancer或ClusterlP类型，根据需要进行暴露。

ingress-nginx-controller-admissionService：用于检查和验证Ingress中定义的规则和设置是否正确。它可以确保在创建、更新或删除Ingress资源时，所有必需的配置项都已正确设置，并防止不正确的配置影响到您的应用程序的运行。此服务还可以执行一些自动化的操作，例如生成TLs证书并将其与相应的Ingress资源关联，以确保通过Ingress的所有流量都以加密的方式传输。该Service也可以被配置为使用NodePort、LoadBalancer或ClusterlP类型，根据需要进行暴露。

2. Ingress Controller的暴露方式

当使用k8s中的Ingress资源对象来暴露应用时，用户访问应用的入口是IngressController 的地址。

Ingress Controller会根据Ingress 规则将请求路由到相应的服务，并将服务的响应返回给客户端。

要把Ingress Controller暴露出去暴露方式有以下几种：

NodePort：使用 NodePort 服务类型来暴露Ingress Controller，这种方式可以将Ingress Controller 暴露到长uibernetes 集群的所有节点上，通过节点的IP地址和NodePort 可以访问到Ipgress Controller。
- 优点：比较简单，易于配置和管理
- 缺点：需要暴露每个节点的端口，容易造成端口泛滥，不易于后续管理，或者在安全方面存在一些隐患。
LoadBalancer（推荐）：使用LoadBalancer服务类型来暴露IngressController，这种方式可以将IngressController暴露到云服务提供商的负载均衡器上，从而可以通过负载均衡器的IP地址来访问IngressController。可以实现更好的负载均衡和高可用性。
- 优点：可以自动创建负载均衡器，可以动态地分配IP地址，易于管理和扩展
- 缺点：需要依赖云尺商提供的负载均衡器服务，对于一些不支持负载均衡器服务的云平台或者本地环境不太适用

案例

创建deployment yaml文件

yaml

[root@kube-master ingress]# cat dp.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx-dm
spec:
  selector:
    matchLabels:
      name: nginx
  replicas: 2
  template:
    metadata:
      labels:
        name: nginx
    spec:
      containers:
      - name: nginx
        image: registry.cn-zhangjiakou.aliyuncs.com/hsuing/demoapp:v1
        imagePullPolicy: IfNotPresent
        ports:
        - containerPort: 80
---
apiVersion: v1
kind: Service
metadata:
  name: nginx-svc
spec:
  type: NodePort
  ports:
  - port: 80
    targetPort: 80
    protocol: TCP
  selector:
    name: nginx

[root@kube-master ingress]# cat dp.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx-dm
spec:
  selector:
    matchLabels:
      name: nginx
  replicas: 2
  template:
    metadata:
      labels:
        name: nginx
    spec:
      containers:
      - name: nginx
        image: registry.cn-zhangjiakou.aliyuncs.com/hsuing/demoapp:v1
        imagePullPolicy: IfNotPresent
        ports:
        - containerPort: 80
---
apiVersion: v1
kind: Service
metadata:
  name: nginx-svc
spec:
  type: NodePort
  ports:
  - port: 80
    targetPort: 80
    protocol: TCP
  selector:
    name: nginx

创建

shell

[root@kube-master ingress]# kubectl apply  -f dp.yaml
deployment.apps/nginx-dm created

[root@kube-master ingress]# kubectl apply  -f dp.yaml
deployment.apps/nginx-dm created

查看

shell

[root@kube-master ingress]# kubectl get svc
NAME           TYPE        CLUSTER-IP       EXTERNAL-IP   PORT(S)          AGE
nginx-svc      NodePort   192.168.26.95    <none>        80/TCP           10s

[root@kube-master ingress]# kubectl get svc
NAME           TYPE        CLUSTER-IP       EXTERNAL-IP   PORT(S)          AGE
nginx-svc      NodePort   192.168.26.95    <none>        80/TCP           10s

创建ingres文件

yaml

apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: my-ingress
spec:
  ingressClassName: "nginx"
  rules:
  - host: my.host.com
    http:
      paths:
      - path: /
        pathType: Prefix
        backend:
          service:
            name: nginx-svc
            port:
              number: 80

apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: my-ingress
spec:
  ingressClassName: "nginx"
  rules:
  - host: my.host.com
    http:
      paths:
      - path: /
        pathType: Prefix
        backend:
          service:
            name: nginx-svc
            port:
              number: 80

创建

shell

[root@kube-master ingress]# kubectl apply -f ingres-nginx.yaml
ingress.networking.k8s.io/my-ingress created

[root@kube-master ingress]# kubectl apply -f ingres-nginx.yaml
ingress.networking.k8s.io/my-ingress created

查看

shell

[root@kube-master ingress]# kubectl get ingress
NAME         CLASS   HOSTS         ADDRESS           PORTS   AGE
my-ingress   nginx   my.host.com   192.168.104.132   80      105s

[root@kube-master ingress]# kubectl get ingress
NAME         CLASS   HOSTS         ADDRESS           PORTS   AGE
my-ingress   nginx   my.host.com   192.168.104.132   80      105s

客户端测试

配置windows，C:\Windows\System32\drivers\etc，将域名解析安装了Ingress节点的地址，然后测试访问

查看效果

视频

https://www.taohui.tech/2021/05/17/k8s/在线课程：K8S-Ingress-Controller技术细节探讨/

https://help.aliyun.com/zh/ack/ack-managed-and-ack-dedicated/user-guide/advanced-nginx-ingress-configurations

https://www.nginx-cn.net/blog/performance-testing-nginx-ingress-controllers-dynamic-kubernetes-cloud-environment/

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