ingress 配置长连接 ingress端口能改吗

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bigrobin 2024-03-28 22:51:08

文章标签 ingress 配置长连接 Ingress nginx controller hostNetwork nodePort 文章分类 云原生云计算

Ingress

NodePort缺点:

一个端口只能对应一个服务使用,端口需要提前规划
只支持4层负载均衡

Ingress与Pod的关系

通过Service相关联
通过Ingress Controller实现Pod的负载均衡
-支持TCP/UDP4层和HTTP 7层

ingress Controller部署

Ingress Controller 有很多种实现方法,这里采用官网维护的Nginx控制器

部署文档: https://github.com/kubernetes/ingress-nginx/blob/master/docs/deploy/index.md

其他主流控制器:
Traefik: HTTP反向代理, 负载均衡工具
istio: 服务治理, 控制入口流量

部署nginx-ingress-controller

YAML文件地址:

https://github.com/kubernetes/ingress-nginx/blob/nginx-0.30.0/deploy/static/mandatory.yaml

下载YAML文件到本地ingress-nginx.yaml,修改配置:

修改ingress-nginx镜像地址
suisrc/ingress-nginx:0.30.0
如果使用Deployment控制器建议配置replicas为2
加入default-http-backend(在Deployment.nginx-ingress-controller之前),YAML配置如下

还需要再ingress-nginx.yaml中加入参数–default-backend-service=$(POD_NAMESPACE)/default-http-backend,如下
containers: - name: nginx-ingress-controller image: suisrc/ingress-nginx:0.30.0 args: - /nginx-ingress-controller - --default-backend-service=$(POD_NAMESPACE)/default-http-backend - --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

default-http-backend的yaml配置

---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: default-http-backend
  labels:
    app: default-http-backend
  namespace: ingress-nginx
spec:
  replicas: 1
  selector:
    matchLabels:
      app: default-http-backend
  template:
    metadata:
      labels:
       app: default-http-backend
    spec:
      terminationGracePeriodSeconds: 60
      containers:
      - name: default-http-backend
        image:  registry.cn-qingdao.aliyuncs.com/kubernetes_xingej/defaultbackend-amd64:1.5
        livenessProbe:
          httpGet:
            path: /healthz
            port: 8080
            scheme: HTTP
          initialDelaySeconds: 30
          timeoutSeconds: 5
        ports:
        - containerPort: 8080
        resources:
          limits:
            cpu: 100m
            memory: 100Mi
          requests:
            cpu: 100m
            memory: 100Mi
---
apiVersion: v1
kind: Service
metadata:
  name: default-http-backend
  # namespace: ingress-nginx
  namespace: ingress-nginx
  labels:
    app: default-http-backend
spec:
  ports:
  - port: 80
    targetPort: 8080
  selector:
    app: default-http-backend
---

hostNetwork模式

hostNetwork
将域名解析到部署ingress Controller的node节点IP,端口为ingress Controller暴露端口(80,443),进行访问
通过Ingress访问的逻辑为：Client Request -> Ingress-Controller节点 -> Ingress -> Service -> Deployment

注意:
需要在Ingress Controller的yaml配置文件中指定使用主机网络hostNetwork: true位置位于spec.tmplate.spec下
不需要配置Service,通过kubectl get ingress获取ingress信息时候,ADDRESS地址会为空
可以将控制器设置为DaemonSet,就可以将域名解析到任意节点进行访问了
部署ingress Controller节点端口(80,443)不能被占用

NodePort模式

nodePort
通过Service暴露部署的Ingress Controller,将域名解析到任意节点,然后通过域名:nodePort端口进行访问
通过Ingress访问的逻辑为：Client Request -> Ingress-service(通过NodePort暴露端口) -> Ingress -> Service -> Deployment

注意:
需要配置Service暴露端口,通过kubectl get ingress获取ingress信息时候,ADDRESS地址为Service的ClusterIP
域名可以解析到任意节点,访问时候需要带端口,端口为service的nodePort

配置ingress-service.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
      # HTTP
      nodePort: 32080
    - name: https
      port: 443
      targetPort: 443
      protocol: TCP
     # HTTPS
      nodePort: 32443
  selector:
    app.kubernetes.io/name: ingress-nginx
    app.kubernetes.io/part-of: ingress-nginx
---

配置ingress

配置ingress.yaml,为已存在的deploy/nginx添加域名(namespace为default,service为nginx-service)

---
apiVersion: networking.k8s.io/v1beta1
kind: Ingress
metadata:
  name: nginx-domain
  namespace: default
spec:
  rules:
  - host: www.abc.com
    http:
      paths:
      - path: /
        backend:
          serviceName: nginx-service
          servicePort: 80
---

ingress其余样例

---
# http
apiVersion: networking.k8s.io/v1beta1
kind: Ingress
metadata:
  name: example-ingress
spec:
  rules:
  - host: example.ctnrs.com
    http:
      paths:
      - path: /
        backend:
          serviceName: web
          servicePort: 80

---
# https
apiVersion: networking.k8s.io/v1beta1
kind: Ingress
metadata:
  name: tls-example-ingress
spec:
  tls:
  - hosts:
    - sslexample.ctnrs.com
    secretName: secret-tls
  rules:
    - host: sslexample.ctnrs.com
      http:
        paths:
        - path: /
          backend:
            serviceName: web
            servicePort: 80

---
# url route
apiVersion: networking.k8s.io/v1beta1
kind: Ingress
metadata:
  name: name-virtual-host-ingress
  annotations:
    nginx.ingress.kubernetes.io/rewrite-target: /
spec:
  rules:
  - host: foobar.ctnrs.com
    http:
      paths:
      - path: /foo
        backend:
          serviceName: service1
          servicePort: 80
  - host: foobar.ctnrs.com
    http:
      paths:
      - path: /bar
        backend:
          serviceName: service2
          servicePort: 80

---
# server
apiVersion: networking.k8s.io/v1beta1
kind: Ingress
metadata:
  name: name-virtual-host-ingress
spec:
  rules:
  - host: foo.ctnrs.com
    http:
      paths:
      - backend:
          serviceName: service1
          servicePort: 80
  - host: bar.ctnrs.com
    http:
      paths:
      - backend:
          serviceName: service2
          servicePort: 80

---
# annotations
apiVersion: networking.k8s.io/v1beta1
kind: Ingress
metadata:
  name: example-ingress
  annotations:
     kubernetes.io/ingress.class: "nginx“
     nginx.ingress.kubernetes.io/proxy-connect-timeout: "600"
     nginx.ingress.kubernetes.io/proxy-send-timeout: "600"
     nginx.ingress.kubernetes.io/proxy-read-timeout: "600"
     nginx.ingress.kubernetes.io/proxy-body-size: "10m"
spec:
  rules:
  - host: example.ctnrs.com
    http:
      paths:
      - path: /
        backend:
          serviceName: web
          servicePort: 80
---
apiVersion: networking.k8s.io/v1beta1
kind: Ingress
metadata:
  name: tls-example-ingress
  annotations:
    kubernetes.io/ingress.class: "nginx“
    nginx.ingress.kubernetes.io/ssl-redirect: 'true'
spec:
  tls:
  - hosts:
    - sslexample.ctnrs.com
    secretName: secret-tls
  rules:
    - host: sslexample.ctnrs.com
      http:
        paths:
        - path: /
          backend:
            serviceName: web
            servicePort: 80

应用配置 && 验证

应用部署

kubectl apply -f ingress-nginx.yaml
kubectl apply -f ingress-service.yaml
kubectl apply -f ingress.yaml

验证

配置相关信息

查看nginx-ingress-controller所有部署信息

kubectl get all -n ingress-nginx

查看default下ingress信息

kubectl get ingress
NAME           CLASS    HOSTS         ADDRESS      PORTS   AGE
nginx-domain   <none>   www.abc.com   10.0.0.160   80      122m

如果ADDRESS为空,可能是没有配置或者没有配置好ingress-service

查看ingress详细信息

kubectl describe ingress
Name:             nginx-domain
Namespace:        default
Address:          10.0.0.160
Default backend:  default-http-backend:80 (<error: endpoints "default-http-backend" not found>)
Rules:
  Host         Path  Backends
  ----         ----  --------
  www.abc.com  
               /        nginx-service:80 (10.244.0.7:80,10.244.1.12:80,10.244.2.7:80 + 1 more...)
Annotations:   Events:  <none>

<error: endpoints “default-http-backend” not found>这个报错可能跟namespace有关,但是不影响效果,通过ip:port方式访问结果为如下即说明default-http-backend工作正常
default backend - 404

域名验证

确定设置本机hosts

192.169.2.201 www.abc.com

访问http://www.abc.com,出现正常页面即为解析成功

固定节点部署ingress

Deployment模式下使用,DaemonSet下忽略

在节点上打标签

kubectl label nodes k8s-node1 node-role.kubernetes.io/ingress="true"
kubectl label nodes k8s-node2 node-role.kubernetes.io/ingress="true"

配置nodeSelector

配置deployment下的nodeSelector,加入node-role.kubernetes.io/ingress: “true”

spec:
      hostNetwork: true
      # wait up to five minutes for the drain of connections
      terminationGracePeriodSeconds: 300
      serviceAccountName: nginx-ingress-serviceaccount
      nodeSelector:
        kubernetes.io/os: linux
        node-role.kubernetes.io/ingress: "true"
      containers:
        - name: nginx-ingress-controller
          image: quay.io/kubernetes-ingress-controller/nginx-ingress-controller:0.30.0

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