在Kubernetes上部署Nginx访问Tomcat，可以按照以下步骤进行：

1. 创建Tomcat和Nginx的Deployment和Service资源。

   • 创建Tomcat Deployment和Service：

     apiVersion: apps/v1
     kind: Deployment
     metadata:
       name: tomcat-deployment
     spec:
       replicas: 1
       selector:
         matchLabels:
           app: tomcat
       template:
         metadata:
           labels:
             app: tomcat
         spec:
           containers:
           - name: tomcat
             image: tomcat:latest
             ports:
             - containerPort: 8080
     ---
     apiVersion: v1
     kind: Service
     metadata:
       name: tomcat-service
     spec:
       selector:
         app: tomcat
       ports:
       - protocol: TCP
         port: 8080
         targetPort: 8080

   • 创建Nginx Deployment和Service：

     apiVersion: apps/v1
     kind: Deployment
     metadata:
       name: nginx-deployment
     spec:
       replicas: 1
       selector:
         matchLabels:
           app: nginx
       template:
         metadata:
           labels:
             app: nginx
         spec:
           containers:
           - name: nginx
             image: nginx:latest
             ports:
             - containerPort: 80
     ---
     apiVersion: v1
     kind: Service
     metadata:
       name: nginx-service
     spec:
       selector:
         app: nginx
       ports:
       - protocol: TCP
         port: 80
         targetPort: 80

2. 创建Nginx的ConfigMap来配置Nginx反向代理。

   apiVersion: v1
   kind: ConfigMap
   metadata:
     name: nginx-config
   data:
     default.conf: |
       server {
           listen       80;
           server_name  localhost;
   
           location / {
               proxy_pass http://tomcat-service:8080;
               proxy_set_header Host $host;
               proxy_set_header X-Real-IP $remote_addr;
               proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
           }
       }

3. 创建Nginx的Deployment使用ConfigMap配置反向代理。

   apiVersion: apps/v1
   kind: Deployment
   metadata:
     name: nginx-deployment
   spec:
     replicas: 1
     selector:
       matchLabels:
         app: nginx
     template:
       metadata:
         labels:
           app: nginx
       spec:
         containers:
         - name: nginx
           image: nginx:latest
           volumeMounts:
           - name: nginx-config
             mountPath: /etc/nginx/conf.d
         volumes:
         - name: nginx-config
           configMap:
             name: nginx-config
     ---
     apiVersion: v1
     kind: Service
     metadata:
       name: nginx-service
     spec:
       selector:
         app: nginx
       ports:
       - protocol: TCP
         port: 80
         targetPort: 80

4. 部署上述资源到Kubernetes集群。

通过上述步骤，您就可以在Kubernetes上部署Nginx来访问Tomcat。Nginx会作为反向代理，将来自80端口的请求转发到Tomcat的8080端口。

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