K8S Ingress 服务配置步骤说明

部署Pod服务

分别使用kubectl run和kubectl apply 部署nginx和tomcat服务

# 快速启动一个nginx服务
kubectl run my-nginx --image=nginx --port=80

# 使用yaml创建tomcat服务
kubectl apply -f my-tomcat.yaml

my-tomcat.yaml

apiVersion: apps/v1
kind: Deployment
metadata:
  name: tomcat-deployment
  labels:
    app: tomcat
spec:
  replicas: 2
  selector:
    matchLabels:
      app: tomcat
  template:
    metadata:
      labels:
        app: tomcat
    spec:
      containers:
      - name: tomcat-container
        image: tomcat:latest
        ports:
        - containerPort: 8080

• kubectl run:主要用于快速创建一个新的Pod,通常用于临时或一次性任务
• kubectl apply:跟进yaml文件中定义的资源进行创建或更新，适合管理长期存在的Kubernetes对象

执行成功后，可以看到Pod已经执行起来
[root@master ~]# kubectl get pods
NAME                                READY   STATUS    RESTARTS        AGE
my-nginx                            1/1     Running   1 (3h17m ago)   8h
tomcat-deployment-6cc9875b5-krskl   1/1     Running   1 (13m ago)     55m
tomcat-deployment-6cc9875b5-qkk9h   1/1     Running   0               55m

部署service服务

部署nginx service服务

# 使用`kubectl expose`命令基于已有的`my-nginx` Pod 快速生成 Service 的 YAML 文件
kubectl expose pod my-nginx --name=my-nginx-service --port=18080 --target-port=80 --type=NodePort --dry-run=client -o yaml > my-nginx-service.yaml



[root@master ~]# kubectl apply -f my-nginx-service.yaml

[root@master ~]# kubectl get service
NAME               TYPE        CLUSTER-IP       EXTERNAL-IP   PORT(S)           AGE
kubernetes         ClusterIP   10.96.0.1        <none>        443/TCP           46h
my-nginx-service   NodePort    10.109.146.167   <none>        18080:32192/TCP   6m46s

部署tomcat service服务

kubectl expose deployment tomcat-deployment --name=my-tomcat-service --port=18089 --target-port=8080 --type=NodePort --dry-run=client -o yaml > my-tomcat-service.yaml

[root@master ~]# kubectl apply -f my-tomcat-service.yaml 
service/my-tomcat-service created

[root@master ~]# kubectl get service
NAME                TYPE        CLUSTER-IP       EXTERNAL-IP   PORT(S)           AGE
kubernetes          ClusterIP   10.96.0.1        <none>        443/TCP           2d
my-nginx-service    NodePort    10.109.146.167   <none>        18080:32192/TCP   141m
my-tomcat-service   NodePort    10.99.171.11     <none>        18089:31875/TCP   15s

安装ingress controller服务

kubectl apply -f https://raw.githubusercontent.com/kubernetes/ingress-nginx/controller-v1.12.0-beta.0/deploy/static/provider/cloud/deploy.yaml

# 通过节点的31520/30871 访问nginx controller的80/443端口
[root@master ~]# kubectl get service -n ingress-nginx
NAME                                 TYPE           CLUSTER-IP      EXTERNAL-IP   PORT(S)                      AGE
ingress-nginx-controller             LoadBalancer   10.109.66.157   <pending>     80:31520/TCP,443:30871/TCP   171m
ingress-nginx-controller-admission   ClusterIP      10.110.31.148   <none>        443/TCP                      171m

使用ingress转发服务

kubectl create ingress my-ingress-nginx --class=nginx --rule="mynginx.com/*=my-nginx-service:18080" --dry-run=client -o yaml > my-nginx-ingress.yaml

kubectl create ingress my-ingress-tomcat --class=nginx --rule="mytomcat.com/*=my-tomcat-service:18089" --dry-run=client -o yaml > my-tomcat-ingress.yaml

[root@master ~]# kubectl apply -f my-tomcat-ingress.yaml
ingress.networking.k8s.io/my-ingress-tomcat created

[root@master ~]# kubectl apply -f my-nginx-ingress.yaml
ingress.networking.k8s.io/my-ingress-nginx created

# 两个ingress资源已经被创建
[root@master ~]# kubectl get ingress
NAME                CLASS   HOSTS          ADDRESS   PORTS   AGE
my-ingress-nginx    nginx   mynginx.com              80      9s
my-ingress-tomcat   nginx   mytomcat.com             80      6s

通过浏览器，ingress controller地址

配置hosts

172.16.15.129 mynginx.com
172.16.15.129 mytomcat.com

访问nginx
http://mynginx.com:31520

访问tomcat
http://mytomcat.com:31520/index.jsp