1. k8s-deployment水平扩缩容（启动多实例，提高并发）

• 第一种方式，修改配置文件

  修改yaml里replicas值，再apply
  

• 使用命令方式扩容

  kubectl scale deployment web --replicas=10
  

• 注：replicas参数控制Pod副本数量

2. 使用命令方式进行扩容

• 先查询pod

  [root@k8s-master deployment]# kubectl get pods
  NAME                  READY   STATUS    RESTARTS   AGE
  web-548b9bcc8-fktlm   1/1     Running   0          97m
  web-548b9bcc8-njf5m   1/1     Running   0          97m
  web-548b9bcc8-prxff   1/1     Running   0          97m
  

• 进行扩容

  [root@k8s-master deployment]# kubectl scale deployment web  --replicas=9
  deployment.apps/web scaled
  

• 验证

  [root@k8s-master deployment]# kubectl get pods
  NAME                  READY   STATUS    RESTARTS   AGE
  web-548b9bcc8-2mrx9   1/1     Running   0          74s
  web-548b9bcc8-2qg7h   1/1     Running   0          74s
  web-548b9bcc8-fktlm   1/1     Running   0          98m
  web-548b9bcc8-kn8zp   1/1     Running   0          74s
  web-548b9bcc8-njf5m   1/1     Running   0          98m
  web-548b9bcc8-prxff   1/1     Running   0          98m
  web-548b9bcc8-rxflx   1/1     Running   0          74s
  web-548b9bcc8-wnfp6   1/1     Running   0          74s
  web-548b9bcc8-x24pv   1/1     Running   0          74s