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: pv001labels:name: pv001
spec:nfs:path: /data/volumes/v1server: 192.168.100.1accessModes: ["ReadWriteOnce"]capacity:storage: 5Gi
---
apiVersion: v1
kind: PersistentVolume
metadata:name: pv002labels:name: pv002
spec:nfs:path: /data/volumes/v2server: 192.168.100.1accessModes: ["ReadWriteOnce"]capacity:storage: 5Gi
---
apiVersion: v1
kind: PersistentVolume
metadata:name: pv003labels:name: pv003
spec:nfs:path: /data/volumes/v3server: 192.168.100.1accessModes: ["ReadWriteOnce"]capacity:storage: 5Gi
---
apiVersion: v1
kind: PersistentVolume
metadata:name: pv004labels:name: pv004
spec:nfs:path: /data/volumes/v4server: 192.168.100.1accessModes: ["ReadWriteOnce"]capacity:storage: 5Gi
---
apiVersion: v1
kind: PersistentVolume
metadata:name: pv005labels:name: pv005
spec:nfs:path: /data/volumes/v5server: 192.168.100.1accessModes: ["ReadWriteOnce"]capacity:storage: 5Gi

• 创建3个有状态副本（使用nginx模拟）

apiVersion: v1
kind: Service
metadata:name: myapplabels:app: myapp
spec:ports:- port: 80name: webclusterIP: Noneselector:app: myapp-pod
---
apiVersion: apps/v1
kind: StatefulSet
metadata:name: myapp
spec:serviceName: myappreplicas: 3selector:matchLabels:app: myapp-podtemplate:metadata:labels:app: myapp-podspec:containers:- name: myappimage: dongfeimg/myapp:v1ports:- containerPort: 80name: webvolumeMounts:- name: myappdatamountPath: /usr/share/nginx/htmlvolumeClaimTemplates:- metadata:name: myappdataspec: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  

更新分区："partition":4

代表pod序号大于等于4的pod做滚动更新，更新时倒序更新