Kubernetes组件Ingress

官方地址：https://kubernetes.github.io/ingress-nginx/deploy/

简介

将原来需要修改Nginx配置，如：哪个域名对应的后端哪一个服务，现将其抽象化转化为一个Ingress类型，可以通过yaml创建，每次不需要修改nginx.conf配置文件，只需applf Ingress即可，会根据定义的rules自动写入nginx配置文件，可以添加HTTPS，以及访问控制，url转发等Nginx多项功能。

部署Ingress-Container

# wget https://raw.githubusercontent.com/kubernetes/ingress-nginx/nginx-0.26.2/deploy/static/provider/cloud-generic.yaml

# 修改yaml文件中的image地址

# 配置服务发现

#vim 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: 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
      serviceAccountName: nginx-ingress-serviceaccount
      nodeSelector:
        kubernetes.io/os: linux
      containers:
        - name: nginx-ingress-controller
          image: ntp.weijiayu.club/rhel7/nginx-ingress-controller:latest
          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
          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:
  - default:
    min:
      memory: 90Mi
      cpu: 100m
    type: Container

# vim service-nodeport.yaml


apiVersion: v1
kind: Service
metadata:
  name: ingress-nginx
  namespace: ingress-nginx
  labels:
    app.kubernetes.io/name: ingress-nginx
    app.kubernetes.io/part-of: ingress-nginx
spec:
  type: NodePort
  ports:
    - name: http
      port: 80
      targetPort: 80
      nodePort: 30080
      protocol: TCP
    - name: https
      port: 443
      targetPort: 443
      protocol: TCP
      nodePort: 30443
  selector:
    app.kubernetes.io/name: ingress-nginx
    app.kubernetes.io/part-of: ingress-nginx

# kubectl apply -f service-nodeport.yaml

部署Nginx的Deploment以及Service

部署多个实例方便查看结果

# vim nginx1-deployment.yaml

apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: nginx1
  namespace: nginx1
  labels:
     app: nginx1
spec:
  replicas: 2
  selector:
    matchLabels:
      app: nginx1
  template:
    metadata:
      name: nginx1
      namespace: nginx1
      labels:
        app: nginx1
    spec:
      containers:
        - name: nginx
          image: ntp.weij.club/myapp/nginx:v1
          ports:
          - containerPort: 80

# vim nginx1-service.yaml

apiVersion: v1
kind: Service
metadata:
  name: nginx1
  namespace: nginx1
  labels:
    app: nginx
spec:
  type: NodePort
  selector:
    app: nginx1
  ports:
    - name: nginx1
      port: 80
      targetPort: 80

部署Ingress域名访问

apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: nginx1-web
  namespace: nginx1
spec:
  rules:
    - host: www1.test.com
      http:
        paths:
        - path: /
          backend:
            serviceName: nginx1
            servicePort: 80

验证：修改Client的hosts文件，浏览器访问www1.test.com:30080

部署Ingress-https访问

https证书认证访问，这里采用自己创建的证书

生成证书

# openssl req -x509 -sha256 -nodes -days 365 -newkey rsa:2048 -keyout tls.key -out tls.crt -subj "/CN=nginxsvc/O=nginxsvc"

将证书添加到kubernetes资源中

# kubectl create secret tls tls-www1 --key tls.key --cert tls.crt

创建Ingress资源

# vim nginx1-ingress-https.yaml

apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: nginx1
  namespace: nginx1
spec:
  tls:
    - hosts:
      - www1.test.com
      secretName: tls-www1
  rules:
    - host: www1.test.com
      http:
        paths:
        - path: /
          backend:
            serviceName: nginx1
            servicePort: 80

浏览器访问：https://www1.test.com:30443

部署Ingress-BasicAuth认证

生成账号密码文件

需要htpasswd命令

# yum -y install httpd

# htpasswd -c auth wei

将test文件添加kubernetes资源中

# kubectl create secret generic basic-auth --from-file=auth

配置Ingress关联

# vim nginx2-ingress-passwd.yaml

apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: nginx2
  namespace: nginx2
  annotations:
    nginx.ingress.kubernetes.io/auth-type: basic
    nginx.ingress.kubernetes.io/auth-secret: basic-auth
    nginx.ingress.kubernetes.io/auth-realm: "Authentication Required - wei"
spec:
  rules:
  - host: www2.test.com
    http:
      paths:
      - path: /
        backend:
          serviceName: nginx2
          servicePort: 80

部署Ingress重定向

名称	描述	值
nginx.ingress.kubernetes.io/rewrite-target	必须重定向流量的目标URL	字符串
nginx.ingress.kubernetes.io/ssl-redirect	指示位置部分是否仅可访问SSL包含时默认True	布尔值
nginx.ingress.kubernetes.io/force-ssl-redirect	即使Ingress未启用TLS，也强制重定向到HTTPS	布尔值
nginx.ingress.kubernetes.io/app-root	定义Countroller必须重定向的应用程序根	字符串
nginx.ingress.kubernetes.io/use-regex	指示Ingress上定义的路径是否使用正则表达式	布尔值

# vim nginx3-ingress-url.yaml

apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: nginx2
  namespace: nginx2
  annotations:
    nginx.ingress.kubernetes.io/rewrite-target: http://www3.test.com:30080/index.html
spec:
  rules:
  - host: www2.test.com
    http:
      paths:
      - path: /
        backend:
          serviceName: nginx2
          servicePort: 80