kubernetes 安装 ingress controller

kubernetes 安装 ingress controller

ingress-nginx

ingress 官方网站ingress 仓库地址ingress-nginx v1.0 最新版本 v1.0 适用于 Kubernetes 版本 v1.19+ （包括 v1.19 ）Kubernetes-v1.22+ 需要使用 ingress-nginx>=1.0，因为 networking.k8s.io/v1beta 已经移除

直接部署 ingress-nginx

直接部署比较简单，直接拉去 girhub 的文件就可以了，如果遇到长时间无响应，可以终止任务从新拉取。拉取镜像部分，可以修改为一下的镜像地址

wget https://raw.githubusercontent.com/kubernetes/ingress-nginx/controller-v1.0.0/deploy/static/provider/baremetal/deploy.yaml sed -i 's@k8s.gcr.io/ingress-nginx/controller:v1.0.0\(.*\)@willdockerhub/ingress-nginx-controller:v1.0.0@' deploy.yaml sed -i 's@k8s.gcr.io/ingress-nginx/kube-webhook-certgen:v1.0\(.*\)$@hzde0128/kube-webhook-certgen:v1.0@' deploy.yaml kubectl apply -f ingress-nginx.yaml

检查安装

Completed 状态的是正常的，可以忽略。

[root@master ~]# kubectl get po -n ingress-nginx NAME READY STATUS RESTARTS AGE ingress-nginx-admission-create-pm6sw 0/1 Completed 0 22m ingress-nginx-admission-patch-m8w94 0/1 Completed 0 22m ingress-nginx-controller-7d4df87d89-272ft 1/1 Running 0 22m [root@master ~]# kubectl get svc -n ingress-nginx NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE ingress-nginx-controller NodePort 10.96.88.139 80:30497/TCP,443:32581/TCP 22m ingress-nginx-controller-admission ClusterIP 10.96.193.26 443/TCP 22m

创建应用yaml

vim tomcat.yaml

apiVersion: apps/v1 kind: Deployment metadata: name: tomcat-deployment labels: app: tomcat spec: replicas: 2 selector: matchLabels: app: tomcat minReadySeconds: 1 progressDeadlineSeconds: 60 revisionHistoryLimit: 2 strategy: type: RollingUpdate rollingUpdate: maxSurge: 1 maxUnavailable: 1 template: metadata: labels: app: tomcat spec: containers: - name: tomcat image: wenlongxue/tomcat:tomcat-demo-62-8fe6052 imagePullPolicy: Always ports: - containerPort: 8080 resources: requests: memory: "2Gi" cpu: "80m" limits: memory: "2Gi" cpu: "80m" readinessProbe: httpGet: path: / port: 8080 initialDelaySeconds: 180 periodSeconds: 5 timeoutSeconds: 3 successThreshold: 1 failureThreshold: 30 --- apiVersion: v1 kind: Service metadata: name: tomcat-service labels: app: tomcat spec: selector: app: tomcat ports: - name: tomcat-port protocol: TCP port: 8080 targetPort: 8080 type: ClusterIP

部署 tomcat 应用

kubectl apply -f tomcat.yaml

创建 ingress yaml

vim tomcat-ingress.yaml

apiVersion: networking.k8s.io/v1 kind: Ingress metadata: name: tomcat annotations: kubernetes.io/ingress.class: "nginx" spec: rules: - host: tomcat.cnsre.cn http: paths: - path: "/" pathType: Prefix backend: service: name: tomcat-service port: number: 8080

部署 tomcat ingress yaml

kubectl apply -f tomcat-ingress.yaml

查看 ingress 对应节点的端口

kubectl get svc -n ingress-nginx NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE ingress-nginx-controller NodePort 10.96.88.139 80:30497/TCP,443:32581/TCP 54m ingress-nginx-controller-admission ClusterIP 10.96.193.26 443/TCP 54m

添加 hosts

在 hosts 文件最后追加 ingress 节点的 IP 地址

54.xxx.xxx.xxx tomcat.cnsre.cn

然后在浏览器中访问 tomcat.cnsre.cn:30497。

使用 hostNetwork 的方式部署 ingress-nginx

每次部署 ingres-nginx 都随机一个 nodePort ，而使用 ingres-nginx 访问的时候也要以 域名:端口 的形式去访问如何直接使用域名去访问呢？下面介绍另外一种安装方式。

wget https://raw.githubusercontent.com/kubernetes/ingress-nginx/controller-v1.0.0/deploy/static/provider/baremetal/deploy.yaml sed -i 's@k8s.gcr.io/ingress-nginx/controller:v1.0.0\(.*\)@willdockerhub/ingress-nginx-controller:v1.0.0@' deploy.yaml sed -i 's@k8s.gcr.io/ingress-nginx/kube-webhook-certgen:v1.0\(.*\)$@hzde0128/kube-webhook-certgen:v1.0@' deploy.yaml

优化 ingress-nginx

使用 hostNetwork

默认 ingress-nginx 随机提供 nodeport 端口，开启 hostNetwork 启用80、443端口。修改 Deployment 下面的 spec参数如下：

... spec: hostNetwork: true # 新增 dnsPolicy: ClusterFirst containers: - name: controller image: willdockerhub/ingress-nginx-controller:v1.0.0 # 更换镜像地址 imagePullPolicy: IfNotPresent lifecycle: ...

修改负载均衡问题

把 kind: Deployment 改为 kind: DaemonSet 模式，这样每台 node 上都有 ingress-nginx-controller pod 副本。参数如下：

... # Source: ingress-nginx/templates/controller-deployment.yaml apiVersion: apps/v1 #kind: Deployment # 注释 kind: DaemonSet # 新增 metadata: labels: helm.sh/chart: ingress-nginx-4.0.1 ...

修改 ingressClass 问题

如果不关心 ingressClass 或者很多没有 ingressClass 配置的 ingress 对象，添加参数 ingress-controller --watch-ingress-without-class=true 。

... args: - /nginx-ingress-controller - --publish-service=$(POD_NAMESPACE)/ingress-nginx-dev-v1-test-controller - --election-id=ingress-controller-leader - --controller-class=k8s.io/ingress-nginx - --configmap=$(POD_NAMESPACE)/ingress-nginx-dev-v1-test-controller - --validating-webhook=:8443 - --validating-webhook-certificate=/usr/local/certificates/cert - --validating-webhook-key=/usr/local/certificates/key - --watch-ingress-without-class=true # 新增 ...

部署检查 ingress

# 部署 kubectl apply -f ingress-nginx.yaml # 检查 pod [root@master ~]# kubectl get pods -n ingress-nginx -o wide NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES ingress-nginx-admission-create-gmnmp 0/1 Completed 0 84m 10.100.219.105 master ingress-nginx-admission-patch-f5sgc 0/1 Completed 0 84m 10.100.219.106 master ingress-nginx-controller-b62w7 1/1 Running 0 84m 10.0.10.51 master ingress-nginx-controller-lsn7h 1/1 Running 0 84m 10.0.20.222 node1 # 检查端口 [root@master ~]# netstat -pntl |grep 443 tcp 0 0 0.0.0.0:443 0.0.0.0:* LISTEN 31248/nginx: master [root@master ~]# netstat -pntl |grep 80 tcp 0 0 0.0.0.0:80 0.0.0.0:* LISTEN 31248/nginx: master

创建应用yaml

vim tomcat.yaml

apiVersion: apps/v1 kind: Deployment metadata: name: tomcat-deployment labels: app: tomcat spec: replicas: 2 selector: matchLabels: app: tomcat minReadySeconds: 1 progressDeadlineSeconds: 60 revisionHistoryLimit: 2 strategy: type: RollingUpdate rollingUpdate: maxSurge: 1 maxUnavailable: 1 template: metadata: labels: app: tomcat spec: containers: - name: tomcat image: wenlongxue/tomcat:tomcat-demo-62-8fe6052 imagePullPolicy: Always ports: - containerPort: 8080 resources: requests: memory: "2Gi" cpu: "80m" limits: memory: "2Gi" cpu: "80m" readinessProbe: httpGet: path: / port: 8080 initialDelaySeconds: 180 periodSeconds: 5 timeoutSeconds: 3 successThreshold: 1 failureThreshold: 30 --- apiVersion: v1 kind: Service metadata: name: tomcat-service labels: app: tomcat spec: selector: app: tomcat ports: - name: tomcat-port protocol: TCP port: 8080 targetPort: 8080 type: ClusterIP

部署 tomcat 应用

kubectl apply -f tomcat.yaml

创建 ingress yaml

vim tomcat-ingress.yaml

apiVersion: networking.k8s.io/v1 kind: Ingress metadata: name: tomcat annotations: kubernetes.io/ingress.class: "nginx" spec: rules: - host: tomcat.cnsre.cn http: paths: - path: "/" pathType: Prefix backend: service: name: tomcat-service port: number: 8080

部署 tomcat ingress yaml

kubectl apply -f tomcat-ingress.yaml

添加 hosts

在 hosts 文件最后追加 ingress 节点的 IP 地址

54.xxx.xxx.xxx tomcat.cnsre.cn

然后在浏览器中访问 tomcat.cnsre.cn:30497。

给 ingress-nginx 配置 HTTPS 访问

创建自签证书文件

openssl req -x509 -nodes -newkey rsa:2048 -keyout tls.key -out tls.crt -subj "/CN=nginx/O=nginx"

创建后会生成两个文件

ll tls.* -rw-r--r--. 1 root root 1127 9月 2 13:04 tls.crt -rw-r--r--. 1 root root 1708 9月 2 13:04 tls.key

创建 secret

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

修改 tomcat-ingress yaml

apiVersion: networking.k8s.io/v1 kind: Ingress metadata: name: tomcat annotations: kubernetes.io/ingress.class: "nginx" spec: tls: # 新增 - hosts: # 新增 - tomcat.cnsre.cn # 新增 secretName: tls-secret # 新增 rules: - host: tomcat.cnsre.cn http: paths: - path: "/" pathType: Prefix backend: service: name: tomcat-service port: number: 8080

修改完重新部署下

kubectl apply -f tomcat-ingress.yaml

验证证书

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