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