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k8s 安装 ingress-nginx

news 来源：原创 2024/5/4 19:48:43

k8s 安装 ingress-nginx

参考官方文档：https://kubernetes.io/zh-cn/docs/concepts/services-networking/ingress/

Kubernetes 暴露服务的方式目前只有三种：LoadBlancer Service、NodePort Service、Ingress

这个负载均衡是基于nginx七层反向代理来实现的，ingress工作原理如下图：

外部客户端通过访问负载均衡器，然后调度到service上，然后在调度到IngressController，IngressController通过Ingress规则（域名或虚拟主机）访问到后端pod，而在Ingress规则当中对应的主机是由service分组来设定的，可以看到，这幅图有2种service，最上面的service是用来对外提供服务的，而下面2个service仅仅是用来分pod组的。

Kubernetes 并没有自带 Ingress Controller，实际上ingress-controller只是一个统称，具体实现有多种，需要自己单独安装，目前，由k8s维护的ingress-controller只有google云的GCE与ingress-nginx两个，常用的是 Ingress-nginx Controller。

Ingress 一般由三个组件组成： 1. Nginx 反向代理负载均衡器 2. 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 等的变化，比如新增、删除等，然后结合 Ingress 定义的规则生成配置，然后动态更新上边的 Nginx 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。 3. 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

如何创建 Ingress 资源

Ingress 中的spec字段是Ingress资源的核心组成部分，主要包含以下3个字段：
- rules：用于定义当前Ingress资源的转发规则列表；由rules定义规则，或没有匹配到规则时，所有的流量会转发到由backend定义的默认后端。
- backend：默认的后端，用于服务那些没有匹配到任何规则的请求；定义Ingress资源时，必须要定义backend或rules两者之一，该字段用于让负载均衡器指定一个全局默认的后端。
- tls：TLS配置，目前仅支持通过默认端口443提供服务，如果要配置指定的列表成员指向不同的主机，则需要通过SNI TLS扩展机制来支持该功能。

部署 Ingress 控制器（Nginx）

下载 ingress controller
wget https://github.com/kubernetes/ingress-nginx/archive/nginx-0.30.0.tar.gz

所需安装包

链接：https://pan.baidu.com/s/1wM3IVmGCud9QNXYH7QiXNw?pwd=mq57 
提取码：mq57 
--来自百度网盘超级会员V1的分享

ingress-nginx文件位于deploy/static目录下，各文件的作用：

configmap.yaml:
提供configmap可以在线更新nginx的配置

default-backend.yaml:
提供一个缺省的后台错误页面 404

namespace.yaml:
创建一个独立的命名空间 ingress-nginx

rbac.yaml：
创建对应的role rolebinding 用于rbac

tcp-services-configmap.yaml:
修改L4负载均衡配置的configmap

udp-services-configmap.yaml:
修改L4负载均衡配置的configmap

with-rbac.yaml:
有应用rbac的nginx-ingress-controller组件

[root@k8s-master ~]# cd /mnt/
[root@k8s-master mnt]# wget https://github.com/kubernetes/ingress-nginx/archive/nginx-0.30.0.tar.gz
[root@k8s-master mnt]# tar xzvf nginx-0.30.0.tar.gz
[root@k8s-master mnt]# cd ingress-nginx-nginx-0.30.0/deploy/static/
[root@k8s-master static]# ls
configmap.yaml  mandatory.yaml  namespace.yaml  provider  rbac.yaml  with-rbac.yaml
[root@k8s-master static]# cp mandatory.yaml /root/
[root@k8s-master static]# cd

# 创建命名空间ingress-nginx
[root@k8s-master static]# cat namespace.yaml 
apiVersion: v1
kind: Namespace
metadata:
  name: ingress-nginx
  labels:
    app.kubernetes.io/name: ingress-nginx
    app.kubernetes.io/part-of: ingress-nginx
    
# 创建几个configmap。可以更新pod中的配置
[root@k8s-master static]# cat configmap.yaml 
kind: ConfigMap
apiVersion: v1
metadata:
  name: nginx-configuration
  namespace: ingress-nginx
  labels:
    app.kubernetes.io/name: ingress-nginx
    app.kubernetes.io/part-of: ingress-nginx

---
kind: ConfigMap
apiVersion: v1
metadata:
  name: tcp-services
  namespace: ingress-nginx
  labels:
    app.kubernetes.io/name: ingress-nginx
    app.kubernetes.io/part-of: ingress-nginx

---
kind: ConfigMap
apiVersion: v1
metadata:
  name: udp-services
  namespace: ingress-nginx
  labels:
    app.kubernetes.io/name: ingress-nginx
    app.kubernetes.io/part-of: ingress-nginx

[root@k8s-master ~]# vim mandatory.yaml #修改配置文件
找到已下apiserver的版本：
apiVersion: apps/v1
kind: DaemonSet  #将原来的Deployment修改为DaemonSet
metadata:
  name: nginx-ingress-controller
  namespace: ingress-nginx
  labels:
    app.kubernetes.io/name: ingress-nginx
    app.kubernetes.io/part-of: ingress-nginx
spec:
  #replicas: 1 #将这里注释
  selector:
    matchLabels:
      app.kubernetes.io/name: ingress-nginx
      app.kubernetes.io/part-of: ingress-nginx
  template:
    metadata:
      labels:
        app.kubernetes.io/name: ingress-nginx
        app.kubernetes.io/part-of: ingress-nginx
      annotations:
        prometheus.io/port: "10254"
        prometheus.io/scrape: "true"
    spec:
      # wait up to five minutes for the drain of connections
      terminationGracePeriodSeconds: 300
      serviceAccountName: nginx-ingress-serviceaccount
      hostNetwork: true  #添加此配置，共享宿主机网络
#      nodeSelector:
#        custom/ingress-controller-ready: "true"  #添加此配置
      containers:
        - name: nginx-ingress-controller
          image: quay.io/kubernetes-ingress-controller/nginx-ingress-controller:0.30.0 #提前将镜像下载下来
          args:
            - /nginx-ingress-controller
            - --configmap=$(POD_NAMESPACE)/nginx-configuration
            - --tcp-services-configmap=$(POD_NAMESPACE)/tcp-services
            - --udp-services-configmap=$(POD_NAMESPACE)/udp-services
            - --publish-service=$(POD_NAMESPACE)/ingress-nginx
            - --annotations-prefix=nginx.ingress.kubernetes.io
          securityContext:
            allowPrivilegeEscalation: true
            capabilities:
              drop:
                - ALL
              add:
                - NET_BIND_SERVICE
            # www-data -> 101
            runAsUser: 101
          env:
            - name: POD_NAME
              valueFrom:
                fieldRef:
                  fieldPath: metadata.name
            - name: POD_NAMESPACE
              valueFrom:
                fieldRef:
                  fieldPath: metadata.namespace
          ports:
            - name: http
              containerPort: 80
              protocol: TCP
            - name: https
              containerPort: 443
              protocol: TCP
          livenessProbe:
            failureThreshold: 3
            httpGet:
              path: /healthz
              port: 10254
              scheme: HTTP
            initialDelaySeconds: 10
            periodSeconds: 10
            successThreshold: 1
            timeoutSeconds: 10
          readinessProbe:
            failureThreshold: 3
            httpGet:
              path: /healthz
              port: 10254
              scheme: HTTP
            periodSeconds: 10
            successThreshold: 1
            timeoutSeconds: 10
          lifecycle:
            preStop:
              exec:
                command:
                  - /wait-shutdown

需要修改的地方：

kind: DaemonSet：

官方原始文件使用的是deployment，replicate 为 1，这样将会在某一台节点上启动对应的nginx-ingress-controller pod。外部流量访问至该节点，由该节点负载分担至内部的service。测试环境考虑防止单点故障，改为DaemonSet然后删掉replicate ，配合亲和性部署在制定节点上启动nginx-ingress-controller pod，确保有多个节点启动nginx-ingress-controller pod，后续将这些节点加入到外部硬件负载均衡组实现高可用性。

hostNetwork: true：

添加该字段，暴露nginx-ingress-controller pod的服务端口（80）

nodeSelector:

增加亲和性部署，有custom/ingress-controller-ready 标签的节点才会部署该DaemonSet

为需要部署nginx-ingress-controller的节点设置lable

给两个node节点设置lable，我这里用的DeamonSet，不设置也可以。

[root@k8s-master ~]# kubectl label nodes k8s-node1 custom/ingress-controller-ready=true

[root@k8s-master ~]# kubectl label nodes k8s-node2 custom/ingress-controller-ready=true

同时在两个node节点下载镜像
[root@k8s-node1 ~]# docker pull quay.io/kubernetes-ingress-controller/nginx-ingress-controller:0.30.0

我这边是设置了master节点污点

对 master 设置污点，其他工作节点都部署

kubectl taint nodes k8s-master01 node-shellrole.kubernetes.io/master=true:NoSchedule

参数解释：

terminationGracePeriodSeconds: 300

1、Pod 被删除，状态置为 Terminating。
2、kube-proxy 更新转发规则，将 Pod 从 service 的 endpoint 列表中摘除掉，新的流量不再转发到该 Pod。
3、如果 Pod 配置了 preStop Hook ，将会执行。
4、kubelet 对 Pod 中各个 container 发送 SIGTERM 信号以通知容器进程开始优雅停止。
5、等待容器进程完全停止，如果在 terminationGracePeriodSeconds 内 (默认 30s) 还未完全停止，就发送 SIGKILL 信号强制杀死进程。
6、所有容器进程终止，清理 Pod 资源。

优雅退出
要实现优雅终止，务必在业务代码里面处理下 SIGTERM 信号

进程优雅退出的方法

1、preStop-webhook
    lifecycle:
      preStop:
        exec:
          command:
          - sleep
          - 5s
          
2、调整优雅终止时间，terminationGracePeriodSeconds 默认是30s。自己视情况而定（terminationGracePeriodSeconds 一定大于sleep的时间）
特别说明： preStop Hook并不会影响SIGTERM的处理，因此有可能preStopHook还没有执行完就收到SIGKILL导致容器强制退出。因此如果preStop Hook设置了n秒，需要设置terminationGracePeriodSeconds为terminationGracePeriodSeconds+n秒。

创建ingress-controller

[root@k8s-master ~]# kubectl apply -f mandatory.yaml
这里需要注意：rbac和rbaccluster的apiserver的版本需要修改为：
rbac.authorization.k8s.io/v1

查看ingress-controller资源
[root@k8s-master ~]# kubectl get pod -n ingress-nginx

测试ingress

创建两个应用和service

[root@k8s-master ~]# vim my-apache.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
 name: my-apache
spec:
 selector:
   matchLabels:
     run: my-apache
 replicas: 2
 template:
  metadata:
   labels:
    run: my-apache
  spec:
   containers:
   - name: my-apache
     image: daocloud.io/library/httpd:2.4
     ports:
     - containerPort: 80
---
apiVersion: v1
kind: Service
metadata:
 name: my-apache
 labels:
  run: my-apache
spec:
 #type: NodePort
 ports:
 - port: 80
   targetPort: 80
   #nodePort: 30002
 selector:
  run: my-apache

[root@k8s-master ~]# cat my-nginx.yaml 
apiVersion: apps/v1
kind: Deployment
metadata:
 name: my-nginx
spec:
 selector:
   matchLabels:
     run: my-nginx
 replicas: 2
 template:
  metadata:
   labels:
    run: my-nginx
  spec:
   containers:
   - name: my-nginx
     image: daocloud.io/library/nginx:1.7.9
     ports:
     - containerPort: 80
---
apiVersion: v1
kind: Service
metadata:
 name: my-nginx
 labels:
  run: my-nginx
spec:
 #type: NodePort
 ports:
 - port: 80
   targetPort: 80
   #nodePort: 30001
 selector:
  run: my-nginx

创建pod和service

创建pod和service
[root@k8s-master ~]# kubectl apply -f my-apache.yaml
[root@k8s-master ~]# kubectl apply -f my-nginx.yaml

配置ingress转发文件

宿主机网络模式 hostNetwork: true

[root@k8s-master ~]# cat ingress-test.yaml 
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
 name: test-ingress
 namespace: default
 annotations:
    nginx.ingress.kubernetes.io/rewrite-target: /
spec:
 rules:  #定义转发规则
 - host: www.ingress.com  #指定域名方式
   http:
    paths:
    - path: /  #指定访问的路径
      pathType: Prefix  #定义路径的类型
      backend:   #定义转发后端的服务
       service:  #定义转发的service
         name: my-apache
         port:
          number: 80 #由于Ingress控制器开启了hostNetwork: true。这里必须设置80
 - host: www.youngfit.com
   http:
    paths:
    - path: /
      pathType: Prefix
      backend:
       service:
         name: my-nginx
         port:
          number: 80

[root@k8s-master mingyu-ingress]# kubectl apply -f ingress-test.yaml

root@k8s-master1:~/ingress_test/pod# kubectl get ing -o wide

nginx-ingress-controller运行在node1,node2两个节点上。

如果网络中有dns服务器，在dns中把这两个域名映射到nginx-ingress-controller运行的任意一个节点上，如果没有dns服务器只能修改host文件了。

任意一个节点上操作：(客户端解析)

我这里有两个节点部署了控制器，ip分别为192.168.2.213，192.168.2.215 ，如果有多个，可以随便选。

访问测试

在windows电脑设置本地解析

访问测试

配置nodePort方式

[root@k8s-master nodeport]# ls
ingress-test.yaml  mandatory.yaml  my-apache.yml  my-nginx.yml

配置my-nginx.yml

apiVersion: apps/v1
kind: Deployment
metadata:
 name: my-nginx
spec:
 selector:
   matchLabels:
     run: my-nginx
 replicas: 2
 template:
  metadata:
   labels:
    run: my-nginx
  spec:
   containers:
   - name: my-nginx
     image: daocloud.io/library/nginx:1.7.9
     ports:
     - containerPort: 80
---
apiVersion: v1
kind: Service
metadata:
 name: my-nginx
 labels:
  run: my-nginx
spec:
 #type: NodePort
 ports:
 - port: 80
   targetPort: 80
   #nodePort: 30001
 selector:
  run: my-nginx

配置my-apache.yml

apiVersion: apps/v1
kind: Deployment
metadata:
 name: my-apache
spec:
 selector:
   matchLabels:
     run: my-apache
 replicas: 2
 template:
  metadata:
   labels:
    run: my-apache
  spec:
   containers:
   - name: my-apache
     image: daocloud.io/library/httpd:2.4
     ports:
     - containerPort: 80
---
apiVersion: v1
kind: Service
metadata:
 name: my-apache
 labels:
  run: my-apache
spec:
 type: NodePort
 ports:
 - port: 80
   targetPort: 80
#   nodePort: 30002
 selector:
  run: my-apache

配置mandatory.yaml

apiVersion: v1
kind: Namespace
metadata:
  name: ingress-nginx
  labels:
    app.kubernetes.io/name: ingress-nginx
    app.kubernetes.io/part-of: ingress-nginx

---

kind: ConfigMap
apiVersion: v1
metadata:
  name: nginx-configuration
  namespace: ingress-nginx
  labels:
    app.kubernetes.io/name: ingress-nginx
    app.kubernetes.io/part-of: ingress-nginx

---
kind: ConfigMap
apiVersion: v1
metadata:
  name: tcp-services
  namespace: ingress-nginx
  labels:
    app.kubernetes.io/name: ingress-nginx
    app.kubernetes.io/part-of: ingress-nginx

---
kind: ConfigMap
apiVersion: v1
metadata:
  name: udp-services
  namespace: ingress-nginx
  labels:
    app.kubernetes.io/name: ingress-nginx
    app.kubernetes.io/part-of: ingress-nginx

---
apiVersion: v1
kind: ServiceAccount
metadata:
  name: nginx-ingress-serviceaccount
  namespace: ingress-nginx
  labels:
    app.kubernetes.io/name: ingress-nginx
    app.kubernetes.io/part-of: ingress-nginx

---
apiVersion: rbac.authorization.k8s.io/v1beta1
kind: ClusterRole
metadata:
  name: nginx-ingress-clusterrole
  labels:
    app.kubernetes.io/name: ingress-nginx
    app.kubernetes.io/part-of: ingress-nginx
rules:
  - apiGroups:
      - ""
    resources:
      - configmaps
      - endpoints
      - nodes
      - pods
      - secrets
    verbs:
      - list
      - watch
  - apiGroups:
      - ""
    resources:
      - nodes
    verbs:
      - get
  - apiGroups:
      - ""
    resources:
      - services
    verbs:
      - get
      - list
      - watch
  - apiGroups:
      - ""
    resources:
      - events
    verbs:
      - create
      - patch
  - apiGroups:
      - "extensions"
      - "networking.k8s.io"
    resources:
      - ingresses
    verbs:
      - get
      - list
      - watch
  - apiGroups:
      - "extensions"
      - "networking.k8s.io"
    resources:
      - ingresses/status
    verbs:
      - update

---
apiVersion: rbac.authorization.k8s.io/v1beta1
kind: Role
metadata:
  name: nginx-ingress-role
  namespace: ingress-nginx
  labels:
    app.kubernetes.io/name: ingress-nginx
    app.kubernetes.io/part-of: ingress-nginx
rules:
  - apiGroups:
      - ""
    resources:
      - configmaps
      - pods
      - secrets
      - namespaces
    verbs:
      - get
  - apiGroups:
      - ""
    resources:
      - configmaps
    resourceNames:
      # Defaults to "<election-id>-<ingress-class>"
      # Here: "<ingress-controller-leader>-<nginx>"
      # This has to be adapted if you change either parameter
      # when launching the nginx-ingress-controller.
      - "ingress-controller-leader-nginx"
    verbs:
      - get
      - update
  - apiGroups:
      - ""
    resources:
      - configmaps
    verbs:
      - create
  - apiGroups:
      - ""
    resources:
      - endpoints
    verbs:
      - get

---
apiVersion: rbac.authorization.k8s.io/v1beta1
kind: RoleBinding
metadata:
  name: nginx-ingress-role-nisa-binding
  namespace: ingress-nginx
  labels:
    app.kubernetes.io/name: ingress-nginx
    app.kubernetes.io/part-of: ingress-nginx
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: Role
  name: nginx-ingress-role
subjects:
  - kind: ServiceAccount
    name: nginx-ingress-serviceaccount
    namespace: ingress-nginx

---
apiVersion: rbac.authorization.k8s.io/v1beta1
kind: ClusterRoleBinding
metadata:
  name: nginx-ingress-clusterrole-nisa-binding
  labels:
    app.kubernetes.io/name: ingress-nginx
    app.kubernetes.io/part-of: ingress-nginx
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: nginx-ingress-clusterrole
subjects:
  - kind: ServiceAccount
    name: nginx-ingress-serviceaccount
    namespace: ingress-nginx

---

apiVersion: apps/v1
#kind: DaemonSet
kind: Deployment
metadata:
  name: nginx-ingress-controller
  namespace: ingress-nginx
  labels:
    app.kubernetes.io/name: ingress-nginx
    app.kubernetes.io/part-of: ingress-nginx
spec:
  replicas: 1
  selector:
    matchLabels:
      app.kubernetes.io/name: ingress-nginx
      app.kubernetes.io/part-of: ingress-nginx
  template:
    metadata:
      labels:
        app.kubernetes.io/name: ingress-nginx
        app.kubernetes.io/part-of: ingress-nginx
      annotations:
        prometheus.io/port: "10254"
        prometheus.io/scrape: "true"
    spec:
      # wait up to five minutes for the drain of connections
      terminationGracePeriodSeconds: 300
#      hostNetwork: true   # 关闭此网络模式
      serviceAccountName: nginx-ingress-serviceaccount
#      nodeSelector:
#        custom/ingress-controller-ready: "true"
#        kubernetes.io/os: linux
      containers:
        - name: nginx-ingress-controller
          image: quay.io/kubernetes-ingress-controller/nginx-ingress-controller:0.30.0
#          image: registry.cn-qingdao.aliyuncs.com/kubernetes_xingej/nginx-ingress-controller:0.20.0
          args:
            - /nginx-ingress-controller
            - --configmap=$(POD_NAMESPACE)/nginx-configuration
            - --tcp-services-configmap=$(POD_NAMESPACE)/tcp-services
            - --udp-services-configmap=$(POD_NAMESPACE)/udp-services
            - --publish-service=$(POD_NAMESPACE)/ingress-nginx
            - --annotations-prefix=nginx.ingress.kubernetes.io
          securityContext:
            allowPrivilegeEscalation: true
            capabilities:
              drop:
                - ALL
              add:
                - NET_BIND_SERVICE
            # www-data -> 101
            runAsUser: 101
          env:
            - name: POD_NAME
              valueFrom:
                fieldRef:
                  fieldPath: metadata.name
            - name: POD_NAMESPACE
              valueFrom:
                fieldRef:
                  fieldPath: metadata.namespace
          ports:
            - name: http
              containerPort: 80
              protocol: TCP
            - name: https
              containerPort: 443
              protocol: TCP
          livenessProbe:
            failureThreshold: 3
            httpGet:
              path: /healthz
              port: 10254
              scheme: HTTP
            initialDelaySeconds: 10
            periodSeconds: 10
            successThreshold: 1
            timeoutSeconds: 10
          readinessProbe:
            failureThreshold: 3
            httpGet:
              path: /healthz
              port: 10254
              scheme: HTTP
            periodSeconds: 10
            successThreshold: 1
            timeoutSeconds: 10
          lifecycle:
            preStop:
              exec:
                command:
                  - /wait-shutdown

---

apiVersion: v1
kind: LimitRange
metadata:
  name: ingress-nginx
  namespace: ingress-nginx
  labels:
    app.kubernetes.io/name: ingress-nginx
    app.kubernetes.io/part-of: ingress-nginx
spec:
  limits:
  - min:
      memory: 90Mi
      cpu: 100m
    type: Container

配置 ingress-test.yaml

[root@k8s-master nodeport]# cat ingress-test.yaml
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
 name: test-ingress
 namespace: default
 annotations:
    nginx.ingress.kubernetes.io/rewrite-target: /
spec:
 rules:  #定义转发规则
 - host: www.ingress.com
   http:
    paths:
    - path: /  #指定访问的路径
      pathType: Prefix  #定义路径的类型
      backend:   #定义转发后端的服务
       service:  #定义转发的service
         name: my-apache
         port:
          number: 80  #这个跟clusetrIP端口保持一致；这里有点模糊。
 - host: www.youngfit.com
   http:
    paths:
    - path: /
      pathType: Prefix
      backend:
       service:
         name: my-nginx
         port:
          number: 81

创建服务

[root@k8s-master nodeport]# kubectl apply -f mandatory.yaml
[root@k8s-master nodeport]# kubectl apply -f my-apache.yml  
[root@k8s-master nodeport]# kubectl apply -f my-nginx.yml
[root@k8s-master nodeport]# kubectl apply -f ingress-test.yaml

root@k8s-master1:~/ingress_test/nodeport# 
root@k8s-master1:~/ingress_test/nodeport# kubectl get pod -o wide
NAME                         READY   STATUS    RESTARTS   AGE    IP               NODE          NOMINATED NODE   READINESS GATES
my-apache-7c88db656c-msndj   1/1     Running   0          4m5s   10.244.169.143   k8s-node2     <none>           <none>
my-apache-7c88db656c-nfnfs   1/1     Running   0          4m5s   10.244.107.209   k8s-node3     <none>           <none>
my-nginx-67f6c85b8-d4q2x     1/1     Running   0          26s    10.244.107.211   k8s-node3     <none>           <none>
my-nginx-67f6c85b8-xbptf     1/1     Running   0          26s    10.244.169.145   k8s-node2     <none>           <none>
nginx-dep-58d6596f96-jmwb4   1/1     Running   0          4d     10.244.224.1     k8s-master2   <none>           <none>
nginx-dep-58d6596f96-xhlhd   1/1     Running   0          4d     10.244.36.67     k8s-node1     <none>           <none>
root@k8s-master1:~/ingress_test/nodeport# kubectl get svc
NAME         TYPE        CLUSTER-IP   EXTERNAL-IP   PORT(S)        AGE
kubernetes   ClusterIP   10.0.0.1     <none>        443/TCP        7d19h
my-apache    NodePort    10.0.0.123   <none>        80:31796/TCP   4m17s
my-nginx     ClusterIP   10.0.0.249   <none>        80/TCP         38s
root@k8s-master1:~/ingress_test/nodeport# kubectl get ingress
NAME           CLASS    HOSTS                              ADDRESS   PORTS   AGE
test-ingress   <none>   www.ingress.com,www.youngfit.com             80      4m16s

配置解析

遇到报错

配置文件ingress-test.yaml出现报错

报错问题：
root@k8s-master1:~/ingress_test/pod# kubectl apply -f ingress-test.yaml 
error: error validating "ingress-test.yaml": error validating data: [ValidationError(Ingress.spec.rules[0].http.paths[0].backend): unknown field "service" in io.k8s.api.networking.v1beta1.IngressBackend, ValidationError(Ingress.spec.rules[1].http.paths[0].backend): unknown field "service" in io.k8s.api.networking.v1beta1.IngressBackend]; if you choose to ignore these errors, turn validation off with --validate=false

解决方法：

no matches for kind “Ingress” in version “networking.k8s.io/v1beta1”
apiVersion: networking.k8s.io/v1beta1 换成
apiVersion: networking.k8s.io/v1
APIVersion 改成 v1 过后，pathType 又不对了
是因为版本问题，新版本和旧版本的配置是不一样的
直接上代码

报错问题：
root@k8s-master1:~/ingress_test/pod# kubectl apply -f ingress-test.yaml 
Error from server (InternalError): error when creating "ingress-test.yaml": Internal error occurred: failed calling webhook "validate.tomcat.ingress.kubernetes.io": Post "https://ingress-nginx-controller-admission-tomcat.ingress-nginx.svc:443/networking/v1/ingresses?timeout=10s": service "ingress-nginx-controller-admission-tomcat" not found

 ingress 内部访问错误
如果不百度和Google，永远都不知道怎么解决

先kubectl get ValidatingWebhookConfiguration
再kubectl delete -A ValidatingWebhookConfiguration ingress-nginx-admission
把那个该死的 admission 删掉
然后就正常了


[外链图片转存中...(img-gi6XrAnf-1661910373654)]

###### 解决方法：

```shell
no matches for kind “Ingress” in version “networking.k8s.io/v1beta1”
apiVersion: networking.k8s.io/v1beta1 换成
apiVersion: networking.k8s.io/v1
APIVersion 改成 v1 过后，pathType 又不对了
是因为版本问题，新版本和旧版本的配置是不一样的
直接上代码

报错问题：
root@k8s-master1:~/ingress_test/pod# kubectl apply -f ingress-test.yaml 
Error from server (InternalError): error when creating "ingress-test.yaml": Internal error occurred: failed calling webhook "validate.tomcat.ingress.kubernetes.io": Post "https://ingress-nginx-controller-admission-tomcat.ingress-nginx.svc:443/networking/v1/ingresses?timeout=10s": service "ingress-nginx-controller-admission-tomcat" not found

[外链图片转存中…(img-GP0DEiff-1661910373654)]

 ingress 内部访问错误
如果不百度和Google，永远都不知道怎么解决

先kubectl get ValidatingWebhookConfiguration
再kubectl delete -A ValidatingWebhookConfiguration ingress-nginx-admission
把那个该死的 admission 删掉
然后就正常了