ICode9
精准搜索请尝试： 精确搜索
首页
编程语言>
数据库
系统相关
互联网
其他分享
Python
Java
JavaScript
android
PHP
首页 > 其他分享> 文章详细

k8s之Service详解-Ingress使用

2021-08-15 10:03:40  阅读：175  来源： 互联网

标签：Ingress name Service app ingress nginx io kubernetes k8s


环境准备

搭建ingress环境

#创建文件夹
[root@master ~]# mkdir ingress-controller
[root@master ~]# cd ingress-controller/
[root@master ingress-controller]# 

#获取ingress-nginx，本次案例使用的是0.30版本（不挂代理可能无法访问，这里我把yaml文件内容复制上来，需要的可以自行复制粘贴）
[root@master ingress-controller]# wget https://raw.githubusercontent.com/kubernetes/ingress-nginx/nginx-0.30.0/deploy/static/mandatory.yaml
[root@master ingress-controller]# wget https://raw.githubusercontent.com/kubernetes/ingress-nginx/nginx-0.30.0/deploy/static/provider/baremetal/service-nodeport.yaml
[root@master ingress-controller]# ls
mandatory.yaml service-nodeport.yaml

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: quay.io/kubernetes-ingress-controller/nginx-ingress-controller:0.30.0
          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
View Code

 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
      protocol: TCP
    - name: https
      port: 443
      targetPort: 443
      protocol: TCP
  selector:
    app.kubernetes.io/name: ingress-nginx
    app.kubernetes.io/part-of: ingress-nginx

---
View Code 
#创建ingress-nginx
[root@master ingress-controller]# kubectl apply -f ./
namespace/ingress-nginx created
configmap/nginx-configuration created
configmap/tcp-services created
configmap/udp-services created
serviceaccount/nginx-ingress-serviceaccount created
clusterrole.rbac.authorization.k8s.io/nginx-ingress-clusterrole created
role.rbac.authorization.k8s.io/nginx-ingress-role created
rolebinding.rbac.authorization.k8s.io/nginx-ingress-role-nisa-binding created
clusterrolebinding.rbac.authorization.k8s.io/nginx-ingress-clusterrole-nisa-binding created
deployment.apps/nginx-ingress-controller created
limitrange/ingress-nginx created
service/ingress-nginx created

#查看ingress-nginx
[root@master ingress-controller]# kubectl get pod -n ingress-nginx
NAME                                        READY   STATUS    RESTARTS   AGE
nginx-ingress-controller-7f74f657bd-kzvrq   1/1     Running   0          2m7s

#查看service
[root@master ingress-controller]# kubectl get svc -n ingress-nginx
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
ingress-nginx NodePort 10.106.160.9 <none> 80:32000/TCP,443:32421/TCP 5m48s

准备service和pod

为了方便后续的实验，创建下图所示的模型

 

创建tomcat-nginx.yaml

apiVersion: apps/v1
kind: Deployment
metadata: 
  name: nginx-deployment
  namespace: dev
spec:
  replicas: 3
  selector:
    matchLabels:
      app: nginx-pod
  template:
    metadata:
      labels:
        app: nginx-pod
    spec:
      containers:
      - name: nginx
        image: nginx:1.17.1
        ports: 
        - containerPort: 80

---

apiVersion: apps/v1
kind: Deployment
metadata: 
  name: tomcat-deployment
  namespace: dev
spec:
  replicas: 3
  selector:
    matchLabels:
      app: tomcat-pod
  template:
    metadata:
      labels:
        app: tomcat-pod
    spec:
      containers:
      - name: tomcat
        image: tomcat:8.5-jre10-slim
        ports: 
        - containerPort: 8080

---

apiVersion: v1
kind: Service
metadata: 
  name: nginx-service
  namespace: dev
spec:
  selector:
    app: nginx-pod
  clusterIP: None
  type: ClusterIP
  ports:
  - port: 80
    targetPort: 80

---

apiVersion: v1
kind: Service
metadata: 
  name: tomcat-service
  namespace: dev
spec:
  selector:
    app: tomcat-pod
  clusterIP: None
  type: ClusterIP
  ports:
  - port: 8080
    targetPort: 8080
View Code

使用配置文件

[root@master ingress-controller]# cd ..
[root@master ~]# vim tomcat-nginx.yaml
[root@master ~]# kubectl create -f tomcat-nginx.yaml 
deployment.apps/nginx-deployment created
deployment.apps/tomcat-deployment created
service/nginx-service created
service/tomcat-service created
[root@master ~]# kubectl get svc -n dev
NAME             TYPE        CLUSTER-IP   EXTERNAL-IP   PORT(S)    AGE
nginx-service    ClusterIP   None         <none>        80/TCP     20s
tomcat-service   ClusterIP   None         <none>        8080/TCP   20s

Http代理

创建ingress-http.yaml

apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: ingress-http
  namespace: dev
spec:
  rules:
  - host: nginx.test.com
    http:
      paths:
      - path: /
        backend:
          serviceName: nginx-service
          servicePort: 80
  - host: tomcat.test.com
    http:
      paths:
      - path: /
        backend:
          serviceName: tomcat-service
          servicePort: 8080

使用配置文件

[root@master ~]# vim ingress-http.yaml

[root@master ~]# kubectl create -f ingress-http.yaml 
ingress.extensions/ingress-http created

[root@master ~]# kubectl get ing ingress-http -n dev
NAME           HOSTS                            ADDRESS   PORTS   AGE
ingress-http   nginx.test.com,tomcat.test.com             80      13s

[root@master ~]# kubectl describe ing ingress-http -n dev
Name:             ingress-http
Namespace:        dev
Address:          10.106.160.9
Default backend:  default-http-backend:80 (<none>)
Rules:
  Host             Path  Backends
  ----             ----  --------
  nginx.test.com   
                   /   nginx-service:80 (10.244.1.33:80,10.244.2.13:80,10.244.2.16:80)
  tomcat.test.com  
                   /   tomcat-service:8080 (10.244.2.14:8080,10.244.2.17:8080,10.244.2.18:8080)
Annotations:
  kubectl.kubernetes.io/last-applied-configuration:  {"apiVersion":"extensions/v1beta1","kind":"Ingress","metadata":{"annotations":{},"name":"ingress-http","namespace":"dev"},"spec":{"rules":[{"host":"nginx.test.com","http":{"paths":[{"backend":{"serviceName":"nginx-service","servicePort":80},"path":"/"}]}},{"host":"tomcat.test.com","http":{"paths":[{"backend":{"serviceName":"tomcat-service","servicePort":8080},"path":"/"}]}}]}}

Events:
  Type    Reason  Age                From                      Message
  ----    ------  ----               ----                      -------
  Normal  CREATE  18m                nginx-ingress-controller  Ingress dev/ingress-http
  Normal  UPDATE  38s (x2 over 18m)  nginx-ingress-controller  Ingress dev/ingress-http

 

修改本机的hosts文件（位置：C:\Windows\System32\drivers\etc），添加如下内容

master虚拟机的IP地址    nginx.test.com
masete虚拟机的IP地址    tomcat.test.com

查看ingress为service提供的端口号

[root@master ~]# kubectl get svc -n ingress-nginx
NAME            TYPE       CLUSTER-IP     EXTERNAL-IP   PORT(S)                      AGE
ingress-nginx   NodePort   10.106.160.9   <none>        80:32000/TCP,443:32421/TCP   95m

在浏览器中测试访问,发现能够访问通

nginx：

 

 tomcat：

 

Https代理

创建证书

[root@master ~]# openssl req -x509 -sha256 -nodes -days 365 -newkey rsa:2048 -keyout tls.key -out tls.crt -subj "/C=CN/ST=BJ/L=BJ/O=nginx/CN=test.com"
Generating a 2048 bit RSA private key
............................+++
..............................+++
writing new private key to 'tls.key'
-----

创建密钥

[root@master ~]# kubectl create secret tls tls-secret --key tls.key --cert tls.crt
secret/tls-secret created

创建ingress-https.yaml

apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: ingress-https
  namespace: dev
spec:
  tls:
    - hosts:
      - nginx.test.com
      - tomcat.test.com
      secretName: tls-secret  #指定密钥
  rules:
  - host: nginx.test.com
    http:
      paths:
      - path: /
        backend:
          serviceName: nginx-service
          servicePort: 80
  - host: tomcat.test.com
    http:
      paths:
      - path: /
        backend:
          serviceName: tomcat-service
          servicePort: 8080

使用配置文件

[root@master ~]# vim ingress-https.yaml
[root@master ~]# kubectl create -f ingress-https.yaml 
ingress.extensions/ingress-https created

[root@master ~]# kubectl get ing ingress-https -n dev
NAME            HOSTS                            ADDRESS        PORTS     AGE
ingress-https   nginx.test.com,tomcat.test.com   10.106.160.9   80, 443   52s

[root@master ~]# kubectl describe ing ingress-https -n dev
Name:             ingress-https
Namespace:        dev
Address:          10.106.160.9
Default backend:  default-http-backend:80 (<none>)
TLS:
  tls-secret terminates nginx.test.com,tomcat.test.com
Rules:
  Host             Path  Backends
  ----             ----  --------
  nginx.test.com   
                   /   nginx-service:80 (10.244.1.33:80,10.244.2.13:80,10.244.2.16:80)
  tomcat.test.com  
                   /   tomcat-service:8080 (10.244.2.14:8080,10.244.2.17:8080,10.244.2.18:8080)
Annotations:
Events:
  Type    Reason  Age   From                      Message
  ----    ------  ----  ----                      -------
  Normal  CREATE  79s   nginx-ingress-controller  Ingress dev/ingress-https
  Normal  UPDATE  38s   nginx-ingress-controller  Ingress dev/ingress-https

获取端口，左边的是http使用的端口，右边是https使用的端口，因此要使用的端口是32421

[root@master ~]# kubectl get svc -n ingress-nginx
NAME            TYPE       CLUSTER-IP     EXTERNAL-IP   PORT(S)                      AGE
ingress-nginx   NodePort   10.106.160.9   <none>        80:32000/TCP,443:32421/TCP   129m

使用浏览器访问

nginx:

 

tomcat:

 

标签：Ingress,name,Service,app,ingress,nginx,io,kubernetes,k8s
来源： https://www.cnblogs.com/Ayanamidesu/p/15136379.html

本站声明： 1. iCode9 技术分享网（下文简称本站）提供的所有内容，仅供技术学习、探讨和分享；
2. 关于本站的所有留言、评论、转载及引用，纯属内容发起人的个人观点，与本站观点和立场无关；
3. 关于本站的所有言论和文字，纯属内容发起人的个人观点，与本站观点和立场无关；
4. 本站文章均是网友提供，不完全保证技术分享内容的完整性、准确性、时效性、风险性和版权归属；如您发现该文章侵犯了您的权益，可联系我们第一时间进行删除；
5. 本站为非盈利性的个人网站，所有内容不会用来进行牟利，也不会利用任何形式的广告来间接获益，纯粹是为了广大技术爱好者提供技术内容和技术思想的分享性交流网站。

关于我们 | 联系我们 | 留言反馈

专注分享技术，共同学习，共同进步。侵权联系[81616952@qq.com]

Copyright (C)ICode9.com, All Rights Reserved.

ICode9版权所有