上一章我们分享了k8s的网络代理模式，今天我们来分享一下k8s中的服务发现。
1.环境变量模式的服务发现
k8s默认为我们提供了通过环境变量来实现服务发现的功能，前提是
1.需要service在pod之前创建
2.适用于同一命名空间
1.1创建service
[root@localhost ~]# cat netcore-service.yaml apiVersion: v1kind: Servicemetadata: ?name: netcore-service ?labels: ???app: netcorespec: ?ports: ?- name: http ???protocol: TCP ???port: 1001 ???targetPort: 1000 ???nodePort: 31111 ?selector: ???app: cys-netcore ?type: NodePort
kubectl create -f netcore-service.yaml
1.2创建pod
[root@localhost ~]# cat netcore.yaml apiVersion: apps/v1beta2kind: Deploymentmetadata: ?name: cys-netcorespec: ?replicas: 1 ?selector: ???matchLabels: ?????app: cys-netcore ?template: ???metadata: ?????labels: ???????app: cys-netcore ???spec: ?????containers: ?????- name: cys-netcore ???????image: chenyishi/webdocker_s_provider ???????ports: ???????- containerPort: 1000 ???????env: ???????- name: serverpo
kubectl create -f netcore.yaml
1.3验证
查看环境变量
我们再以相同的方式再创建一组pod+service
[root@localhost ~]# cat netcore2.yaml apiVersion: apps/v1beta2kind: Deploymentmetadata: ?name: cys-netcore2spec: ?replicas: 1 ?selector: ???matchLabels: ?????app: cys-netcore2 ?template: ???metadata: ?????labels: ???????app: cys-netcore2 ???spec: ?????containers: ?????- name: cys-netcore2 ???????image: chenyishi/webdocker_s_provider ???????ports: ???????- containerPort: 1000 ???????env: ???????- name: serverport ?????????value: "1000"
[root@localhost ~]# cat netcore-service2.yaml apiVersion: v1kind: Servicemetadata: ?name: netcore-service2 ?labels: ???app: netcore2spec: ?ports: ?- name: http ???protocol: TCP ???port: 1002 ???targetPort: 1000 ???nodePort: 31112 ?selector: ???app: cys-netcore2 ?type: NodePort
kubectl create -f netcore-service2.yamlkubectl create -f netcore2.yaml
查看env
我们进入容器，调用一下第一个service
至此，我们证明了可以通过env使service互通
.net core i上 K8S(七).netcore程序的服务发现
原文地址：https://www.cnblogs.com/chenyishi/p/10129093.html