PDB 限制自愿中断：
```
apiVersion: policy/v1
kind: PodDisruptionBudget
metadata:
name: api-pdb
namespace: default
spec:
maxUnavailable: 1
selector:
matchLabels:
app: api
```
Deployment 滚动升级参数：
```
apiVersion: apps/v1
kind: Deployment
metadata:
name: api
spec:
replicas: 5
minReadySeconds: 10
strategy:
type: RollingUpdate
rollingUpdate:
maxSurge: 2
maxUnavailable: 1
selector:
matchLabels:
app: api
template:
metadata:
labels:
app: api
spec:
containers:
- name: api
image: registry.example.com/app/api:v1.0.0
ports:
- containerPort: 3000
```
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