9、kubernetes之statefulset控制器-蒲公英云

9、kubernetes之statefulset控制器

一、StatefulSet 有状态副本集

必要的三个组件：headless service、StatefulSet、volumeClaimTemplate
准备pv

apiVersion: v1
kind: PersistentVolume
metadata:
name: pv001
labels:
```
name: pv001
```
spec:
nfs:
```
path: /data/volumes/v1
server: 192.168.100.1
```
accessModes: [“ReadWriteOnce”]
capacity:
```
storage: 5Gi
```
apiVersion: v1
kind: PersistentVolume
metadata:
name: pv002
labels:
```
name: pv002
```
spec:
nfs:
```
path: /data/volumes/v2
server: 192.168.100.1
```
accessModes: [“ReadWriteOnce”]
capacity:
```
storage: 5Gi
```
apiVersion: v1
kind: PersistentVolume
metadata:
name: pv003
labels:
```
name: pv003
```
spec:
nfs:
```
path: /data/volumes/v3
server: 192.168.100.1
```
accessModes: [“ReadWriteOnce”]
capacity:
```
storage: 5Gi
```
apiVersion: v1
kind: PersistentVolume
metadata:
name: pv004
labels:
```
name: pv004
```
spec:
nfs:
```
path: /data/volumes/v4
server: 192.168.100.1
```
accessModes: [“ReadWriteOnce”]
capacity:
```
storage: 5Gi
```
apiVersion: v1
kind: PersistentVolume
metadata:
name: pv005
labels:
```
name: pv005
```
spec:
nfs:
```
path: /data/volumes/v5
server: 192.168.100.1
```
accessModes: [“ReadWriteOnce”]
capacity:
```
storage: 5Gi
```
创建3个有状态副本（使用nginx模拟）

apiVersion: v1
kind: Service
metadata:
name: myapp
labels:
```
app: myapp
```
spec:
ports:
- port: 80
  name: web
  clusterIP: None
  selector:
  app: myapp-pod
apiVersion: apps/v1
kind: StatefulSet
metadata:
name: myapp
spec:
serviceName: myapp
replicas: 3
selector:
```
matchLabels:
  app: myapp-pod
```
template:
```
metadata:
  labels:
    app: myapp-pod
spec:
  containers:
  - name: myapp
    image: dongfeimg/myapp:v1
    ports:
    - containerPort: 80
      name: web
    volumeMounts:
    - name: myappdata
      mountPath: /usr/share/nginx/html
```
volumeClaimTemplates:
- metadata:
  name: myappdata
  spec:
  accessModes: [“ReadWriteOnce”]
  resources:
```
requests:
  storage: 5Gi
```

二、滚动更新

扩容/缩容

kubectl scale sts myapp —replicas=5
kubectl patch sts myapp -p ‘{“spec”:{“replicas”:2}}’
更新

kubectl patch sts myapp -p ‘{“spec”:{“updateStrategy”:{“rollingUpdate”:{partition”:4}}}}’ #修改更新分区；
kubectl set image sts/myapp myapp=dongfeimg/myapp:v2