A, StatefulSet stateful replica set
- Three components necessary: headless service, StatefulSet, volumeClaimTemplate
- Ready 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
- Creating three states have copies of (use nginx simulation)
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
Second, rollover
- Expansion / contraction capacity
# kubectl scale sts myapp --replicas=5
# kubectl patch sts myapp -p '{"spec":{"replicas":2}}'
- Update
# 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
Update the partition: "partition": 4
On behalf of greater than or equal pod 4 pod numbers do rollover, descending update update