K8Skubectl常用命令升级回滚，弹性伸缩

# yaml文件内容
apiVersion: apps/v1
kind: Deployment
metadata:
creationTimestamp: null
labels:
app: xxxxxxxxxxx
name: xxxxxxxxxxx
spec:
replicas: 2 # 2 副本
selector:
matchLabels: # controller匹配pod标签
app: xxxxxxxxxxx
strategy: {}
template:
metadata:
creationTimestamp: null
labels: # 标签
app: xxxxxxxxxxx
spec:
containers:
- image: nginx:1.14 # 1.14版本nginx
name: nginx
resources: {}
status: {}