Kubernetes实战Ingress-Nginx详解

K8S中Ingress-nginx部署

mandatory.yaml（github.com/kubernetes/…

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:
      - "extensions"
    resources:
      - ingresses
    verbs:
      - get
      - list
      - watch
  - apiGroups:
      - ""
    resources:
      - events
    verbs:
      - create
      - patch
  - apiGroups:
      - "extensions"
    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: 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:
     # hostNetwork: true
      serviceAccountName: nginx-ingress-serviceaccount
      containers:
        - name: nginx-ingress-controller
          #image: quay.io/kubernetes-ingress-controller/nginx-ingress-controller:0.14.0
          image: siriuszg/nginx-ingress-controller 
          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 -> 33
            runAsUser: 33
          env:
            - name: POD_NAME
              valueFrom:
                fieldRef:
                  fieldPath: metadata.name
            - name: POD_NAMESPACE
              valueFrom:
                fieldRef:
                  fieldPath: metadata.namespace
            - name: KUBERNETES_MASTER 
              value: http://192.168.4.71:8080
          ports:
            - name: http
              containerPort: 80
            - name: https
              containerPort: 443
          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

---
apiVersion: v1
kind: Service
metadata:
  name: ingress-controller-svc
  namespace: ingress-nginx
  labels:
    app: ingress-controller-svc
spec:
  type: NodePort
  ports:
  - port: 80
    targetPort: 80
    nodePort: 30280 
  selector:
    app.kubernetes.io/name: ingress-nginx
    app.kubernetes.io/part-of: ingress-nginx

注：

• Deployment.spec.template.spec.containers.image修改为siriuszg/nginx-ingress-controller
• Deployment.spec.template.spec.containers.image.env中加入 “- name: KUBERNETES_MASTER value: http://192.168.4.71:8080”

验证

namespace

pod

配置

创建一个service,包含两个pod

[root@t71 ingress]# vim webapp-rc.yaml 

#apiVersion: extensions/v1beta1 
apiVersion: v1
kind: ReplicationController
#kind: Deployment
metadata:
   name: webapp-rc
   namespace: ingress-nginx
   labels:
     app: webapp-rc
spec:
  replicas: 2
  template:
    metadata:
#      name: webapp-pod
      labels:
        app: webapp-pod
    spec:
      containers:
      - name: webapp
        image: tomcat
        ports:
        - containerPort: 8080

[root@t71 ingress]# vim webapp-svc.yaml 

apiVersion: v1
kind: Service
metadata:
  name: webapp-svc
  namespace: ingress-nginx
  labels:
    app: webapp-svc
spec:
#  type: NodePort
  ports:
  - port: 8081
    targetPort: 8080
#    nodePort: 31000 
  selector:
   app: webapp-pod

创建ingress

[root@t71 ingress]# vim ingress.yaml 

apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: tomcat-ingress
  namespace: ingress-nginx
  annotations:
     nginx.ingress.kubernetes.io/rewrite-target: /
spec:
  rules:
  - host: tomcat.k8s.mrslee.cn 
    http:
      paths:
      - path: /
        backend:
          serviceName: webapp-svc
          servicePort: 8081

查看服务

验证服务

直接curl clusrerIP

验证ingress服务

总结遇到的坑

坑1

[root@t76 docker]# docker search centos
Error response from daemon: Get https://index.docker.io/v1/search?q=centos&n=25: remote error: tls: handshake failure

这个问题目前还没有找到合适的解决办法，每次都是通过ping www.baidu.com,多试几次就能够使用了

坑2

更换image源就解决了问题

后记

肺炎猖狂，在家闭关！最近，会持续更新自己前期整理的学习资料，大家如果感兴趣的，请点赞，加关注

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