一、如何实现外界能访问
外界访问不了
1、启动svc
[root@k8s-master ~]# cat myweb-svc.yaml apiVersion: v1kind: Servicemetadata: ?name: nginxspec: ?type: NodePort ?ports: ???- port: 80 ?????nodePort: 30001 ?selector: ???app: myweb ???[root@k8s-master ~]# kubectl create -f myweb-svc.yaml service "nginx" created
2、查看svc状态
[root@k8s-master ~]# kubectl get allNAME ??????DESIRED ??CURRENT ??READY ????AGErc/myweb ??3 ????????3 ????????3 ????????19mNAME ????????????CLUSTER-IP ??????EXTERNAL-IP ??PORT(S) ???????AGEsvc/kubernetes ??10.254.0.1 ??????<none> ???????443/TCP ???????22hsvc/nginx ???????10.254.205.175 ??<nodes> ??????80:30001/TCP ??27sNAME ????????????READY ????STATUS ???RESTARTS ??AGEpo/myweb-7m76h ??1/1 ??????Running ??0 ?????????18mpo/myweb-kzq8c ??1/1 ??????Running ??0 ?????????18mpo/myweb-mnf7x ??1/1 ??????Running ??0 ?????????18m
3、被外界访问原理图
二、为什么是30001？
1、修改为3000看看是否正常？
[root@k8s-master ~]# vim myweb-svc.yaml更改端口为：3000[root@k8s-master ~]# kubectl delete svc/nginxservice "nginx" deleted[root@k8s-master ~]# kubectl create -f myweb-svc.yaml The Service "nginx" is invalid: spec.ports[0].nodePort: Invalid value: 3000: provided port is not in the valid range. The range of valid ports is 30000-32767
2、端口更改为30001
[root@k8s-master ~]# vim myweb-svc.yaml 更改端口为：30001[root@k8s-master ~]# kubectl create -f myweb-svc.yaml service "nginx" created[root@k8s-master ~]# kubectl get allNAME ??????DESIRED ??CURRENT ??READY ????AGErc/myweb ??3 ????????3 ????????3 ????????25mNAME ????????????CLUSTER-IP ?????EXTERNAL-IP ??PORT(S) ???????AGEsvc/kubernetes ??10.254.0.1 ?????<none> ???????443/TCP ???????22hsvc/nginx ???????10.254.145.15 ??<nodes> ??????80:30027/TCP ??8sNAME ????????????READY ????STATUS ???RESTARTS ??AGEpo/myweb-7m76h ??1/1 ??????Running ??0 ?????????24mpo/myweb-kzq8c ??1/1 ??????Running ??0 ?????????24mpo/myweb-mnf7x ??1/1 ??????Running ??0 ?????????25m
默认不填写，自动分配30000-32767内任意一端口
三、自动加载到负载均衡里面
1、修改svc副本数为1
[root@k8s-master ~]# kubectl get pod -o wideNAME ?????????READY ????STATUS ???RESTARTS ??AGE ??????IP ???????????NODEmyweb-7m76h ??1/1 ??????Running ??0 ?????????26m ??????172.16.10.2 ??k8s-node1myweb-kzq8c ??1/1 ??????Running ??0 ?????????26m ??????172.16.48.4 ??k8s-node2myweb-mnf7x ??1/1 ??????Running ??0 ?????????26m ??????172.16.48.2 ??k8s-node2[root@k8s-master ~]# kubectl edit rc myweb ?replicas: 1 replicationcontroller "myweb" edited[root@k8s-master ~]# kubectl get pod -o wideNAME ?????????READY ????STATUS ???RESTARTS ??AGE ??????IP ???????????NODEmyweb-mnf7x ??1/1 ??????Running ??0 ?????????28m ??????172.16.48.2 ??k8s-node2[root@k8s-master ~]# kubectl ?describe svc nginxName:nginxNamespace:defaultLabels:<none>Selector:app=mywebType:NodePortIP:10.254.145.15Port:<unset>80/TCPNodePort:<unset>30027/TCPEndpoints:172.16.48.2:80Session Affinity:NoneNo events.
2、修改svc副本数为5
[root@k8s-master ~]# kubectl edit rc myweb ?replicas: 5replicationcontroller "myweb" edited[root@k8s-master ~]# kubectl ?describe svc nginxName:nginxNamespace:defaultLabels:<none>Selector:app=mywebType:NodePortIP:10.254.145.15Port:<unset>80/TCPNodePort:<unset>30027/TCPEndpoints:172.16.10.2:80,172.16.10.3:80,172.16.48.2:80 + 1 more...Session Affinity:NoneNo events.[root@k8s-master ~]# kubectl get pod -o wideNAME ?????????READY ????STATUS ???RESTARTS ??AGE ??????IP ???????????NODEmyweb-415zs ??1/1 ??????Running ??0 ?????????9s ???????172.16.48.3 ??k8s-node2myweb-7bw5f ??1/1 ??????Running ??0 ?????????9s ???????172.16.10.3 ??k8s-node1myweb-7kzh2 ??1/1 ??????Running ??0 ?????????9s ???????172.16.48.4 ??k8s-node2myweb-j45xb ??1/1 ??????Running ??0 ?????????9s ???????172.16.10.2 ??k8s-node1myweb-mnf7x ??1/1 ??????Running ??0 ?????????30m ??????172.16.48.2 ??k8s-node2
四、上网测试截图
1、node1 web截图
2、node2 web截图
kubernetes云平台管理实战： 自动加载到负载均衡（七）
原文地址：https://www.cnblogs.com/luoahong/p/10300385.html