1. k8s-deployment水平擴縮容（啟動多例項，提高併發）

• 第一種方式，修改配置檔案

  修改yaml裡replicas值，再apply
  

• 使用命令方式擴容

  kubectl scale deployment web --replicas=10
  

• 注：replicas引數控制Pod副本數量

2. 使用命令方式進行擴容

• 先查詢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
   
  

• 進行擴容

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

• 驗證

  [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