首先，我们创建一个多实例的deployment，并为这个deployment创建service。

---创建deployment: nginx
[root@k8s-master ~]# kubectl create deployment nginx --image=nginx:1.20.1 --replicas=3
deployment.apps/nginx created
[root@k8s-master ~]# kubectl get pods -o wide
NAME                    READY   STATUS    RESTARTS   AGE     IP              NODE         NOMINATED NODE   READINESS GATES
nginx-9dfb46bc4-4rf64   1/1     Running   0          3m38s   10.244.58.231   k8s-node02   <none>           <none>
nginx-9dfb46bc4-7ltlw   1/1     Running   0          3m38s   10.244.58.236   k8s-node02   <none>           <none>
nginx-9dfb46bc4-phft8   1/1     Running   0          3m38s   10.244.58.241   k8s-node02   <none>           <none>               37s

---创建service： load-balancer
[root@k8s-master ~]# kubectl expose deployment nginx --port=80 --target-port=80 --type=NodePort --name=load-balancer
service/load-balancer ex