Service 引入主要是解决 Pod 的动态变化，提供统一访问入口：
- 防止 Pod 失联，准备找到提供同一个服务的 Pod （服务发现）
- 定义一组 Pod 的访问策略 （负载均衡）
部署 deploy
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kubectl apply -f deploy.yaml |
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apiVersion: apps/v1kind: Deploymentmetadata: name: chiyi-nginxspec: replicas: 3 selector: matchLabels: app: chiyi-nginx template: metadata: labels: app: chiyi-nginx spec: containers: - name: nginx image: nginx:1.14.2 ports: - containerPort: 80 |
部署 service
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kubectl apply -f service.yaml |
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apiVersion: v1kind: Servicemetadata: name: chiyi-nginxspec: selector: app: chiyi-nginx ports: - protocol: TCP port: 80 targetPort: 80 nodePort: 30002 type: NodePort |
查看 service 和 pod 的关系
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kubectl get epcurl 10.244.1.58:80 |
说明：
Service 通过标签关联一组 Pod
Service 为一组 Pod 提供负载均衡能力
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[root@k8s-master service]# kubectl get epNAME ENDPOINTS AGEchiyi-nginx 10.244.1.58:80,10.244.1.59:80,10.244.2.46:80 5m19skubernetes 172.17.28.225:6443 23h[root@k8s-master service]# curl 10.244.1.58:80<!DOCTYPE html><html><head><title>Welcome to nginx!</title><style> body { width: 35em; margin: 0 auto; font-family: Tahoma, Verdana, Arial, sans-serif; }</style></head><body><h1>Welcome to nginx!</h1><p>If you see this page, the nginx web server is successfully installed andworking. Further configuration is required.</p> <p>For online documentation and support please refer to<a href="http://nginx.org/">nginx.org</a>.<br/>Commercial support is available at<a href="http://nginx.com/">nginx.com</a>.</p> <p><em>Thank you for using nginx.</em></p></body></html> |
查看 service
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kubectl get servicecurl 10.101.104.218 |
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[root@k8s-master service]# kubectl get serviceNAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGEchiyi-nginx NodePort 10.101.104.218 <none> 80:30002/TCP 6m3skubernetes ClusterIP 10.96.0.1 <none> 443/TCP 23h[root@k8s-master service]# curl 10.101.104.218<!DOCTYPE html><html><head><title>Welcome to nginx!</title><style> body { width: 35em; margin: 0 auto; font-family: Tahoma, Verdana, Arial, sans-serif; }</style></head><body><h1>Welcome to nginx!</h1><p>If you see this page, the nginx web server is successfully installed andworking. Further configuration is required.</p> <p>For online documentation and support please refer to<a href="http://nginx.org/">nginx.org</a>.<br/>Commercial support is available at<a href="http://nginx.com/">nginx.com</a>.</p> <p><em>Thank you for using nginx.</em></p></body></html> |
查看端口
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ss -antp |grep 30002 |
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[root@k8s-master service]# ss -antp |grep 30002LISTEN 0 128 *:30002 *:* users:(("kube-proxy",pid=3544,fd=13)) |
导出 yaml
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kubectl get service chiyi-nginx -o yaml |
筛选 service 关联 pod
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kubectl get pods -l app=chiyi-nginx |
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[root@k8s-master service]# kubectl get pods -l app=chiyi-nginxNAME READY STATUS RESTARTS AGEchiyi-nginx-5bbf8bff4b-6bwfz 1/1 Running 0 3m58schiyi-nginx-5bbf8bff4b-bpvvc 1/1 Running 0 3m58schiyi-nginx-5bbf8bff4b-pwwt4 1/1 Running 0 3m58s |
扩容测试
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kubectl scale deployment chiyi-nginx --replicas=1kubectl get service,pods,ep |
Service 三种常用类型
- ClusterIP 集群内部使用,任一节点服务器和 pod 内部都可以访问
- NodePort 对外暴露应用（端口默认范围：30000-32767），任一节点服务器公网IP+端口号，可在浏览器访问。
- LoadBalancer 对外暴露应用，适合公有云
到此这篇关于k8s 使用 Service 控制器对外暴露服务的文章就介绍到这了,更多相关k8s对外暴露服务内容请搜索服务器之家以前的文章或继续浏览下面的相关文章希望大家以后多多支持服务器之家！
原文链接：https://blog.csdn.net/smile_tianya/article/details/123775454
