关于k8s|关于k8s 使用 Service 控制器对外暴露服务的问题关于k8s使用Service控制器对外暴

部署 deploy
部署 service
查看 service 和 pod 的关系
查看 service
查看端口
导出 yaml
筛选 service 关联 pod
扩容测试
Service 三种常用类型

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

kubectl apply -f deploy.yaml

apiVersion: apps/v1kind: Deploymentmetadata:name: chiyi-nginxspec:replicas: 3selector:matchLabels:app: chiyi-nginxtemplate:metadata:labels:app: chiyi-nginxspec:containers:- name: nginximage: nginx:1.14.2ports:- containerPort: 80

部署 service

kubectl apply -f service.yaml

apiVersion: v1kind: Servicemetadata:name: chiyi-nginxspec:selector:app: chiyi-nginxports:- protocol: TCPport: 80targetPort: 80nodePort: 30002type: NodePort

查看 service 和 pod 的关系

kubectlget 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

[root@k8s-master service]# kubectl get epNAMEENDPOINTSAGEchiyi-nginx10.244.1.58:80,10.244.1.59:80,10.244.2.46:805m19skubernetes172.17.28.225:644323h[root@k8s-master service]# curl 10.244.1.58:80Welcome to nginx!body {width: 35em; margin: 0 auto; font-family: Tahoma, Verdana, Arial, sans-serif; }Welcome to nginx!If you see this page, the nginx web server is successfully installed andworking. Further configuration is required.
For online documentation and support please refer tonginx.org.
Commercial support is available atnginx.com.
Thank you for using nginx.

查看 service

kubectlget servicecurl 10.101.104.218

[root@k8s-master service]# kubectl get serviceNAMETYPECLUSTER-IPEXTERNAL-IPPORT(S)AGEchiyi-nginxNodePort10.101.104.21880:30002/TCP6m3skubernetesClusterIP10.96.0.1443/TCP23h[root@k8s-master service]# curl 10.101.104.218Welcome to nginx!body {width: 35em; margin: 0 auto; font-family: Tahoma, Verdana, Arial, sans-serif; }Welcome to nginx!If you see this page, the nginx web server is successfully installed andworking. Further configuration is required.
For online documentation and support please refer tonginx.org.
Commercial support is available atnginx.com.
Thank you for using nginx.

查看端口

ss -antp |grep 30002

[root@k8s-master service]# ss -antp |grep 30002LISTEN0128*:30002*:*users:(("kube-proxy",pid=3544,fd=13))

【关于k8s|关于k8s 使用 Service 控制器对外暴露服务的问题】
导出 yaml

kubectlget service chiyi-nginx -o yaml

筛选 service 关联 pod

kubectl get pods -l app=chiyi-nginx

[root@k8s-master service]# kubectl get pods -l app=chiyi-nginxNAMEREADYSTATUSRESTARTSAGEchiyi-nginx-5bbf8bff4b-6bwfz1/1Running03m58schiyi-nginx-5bbf8bff4b-bpvvc1/1Running03m58schiyi-nginx-5bbf8bff4b-pwwt41/1Running03m58s

扩容测试