kubernetes实验挑战四（Build a highly available Redis Cluster | redis-cluster-config | PersistentVolume）
Build a highly available Redis Cluster based on the given architecture diagram.
1、创建redis-cluster
StatefulSet - Name: redis-cluster
Replicas: 6
Pods status: Running (All 6 replicas)
Image: redis:5.0.1-alpine, Label = app: redis-cluster
container name: redis, command: [“/conf/update-node.sh”, “redis-server”, “/conf/redis.conf”]
Env: name: ‘POD_IP’, valueFrom: ‘fieldRef’, fieldPath: ‘status.podIP’ (apiVersion: v1)
Ports - name: ‘client’, containerPort: ‘6379’
Ports - name: ‘gossip’, containerPort: ‘16379’
Volume Mount - name: ‘conf’, mountPath: ‘/conf’, readOnly:‘false’ (ConfigMap Mount)
Volume Mount - name: ‘data’, mountPath: ‘/data’, readOnly:‘false’ (volumeClaim)
volumes - name: ‘conf’, Type: ‘ConfigMap’, ConfigMap Name: ‘redis-cluster-configmap’,
Volumes - name: ‘conf’, ConfigMap Name: ‘redis-cluster-configmap’, defaultMode = ‘0755’
volumeClaimTemplates - name: ‘data’
volumeClaimTemplates - accessModes: ‘ReadWriteOnce’
volumeClaimTemplates - Storage Request: ‘1Gi’
---
apiVersion: apps/v1
kind: StatefulSet
metadata:
name: redis-cluster
labels:
run: redis-cluster
spec:
serviceName: redis-cluster-service
replicas: 6
selector:
matchLabels:
app: redis-cluster
template:
metadata:
name: redis-cluster
labels:
app: redis-cluster
spec:
volumes:
- name: conf
configMap:
name: redis-cluster-configmap
defaultMode: 0755
containers:
- image: redis:5.0.1-alpine
name: redis
command:
- "/conf/update-node.sh"
- "redis-server"
- "/conf/redis.conf"
env:
- name: POD_IP
valueFrom:
fieldRef:
fieldPath: status.podIP
apiVersion: v1
ports:
- containerPort: 6379
name: client
- name: gossip
containerPort: 16379
volumeMounts:
- name: conf
mountPath: /conf
readOnly: false
- name: data
mountPath: /data
readOnly: false
volumeClaimTemplates:
- metadata:
name: data
spec:
accessModes: ["ReadWriteOnce"]
resources:
requests:
storage: 1Gi
2、创建redis01-06 pv卷:在Kubernetes中，可以使用List来批量创建pv卷
PersistentVolume - Name: redis01…06
Access modes: ReadWriteOnce
Size: 1Gi
hostPath: /redis01…06, directory should be created on worker node
---
apiVersion: v1
kind: List
items:
- kind: PersistentVolume
apiVersion: v1
metadata:
name: redis01
spec:
accessModes: ["ReadWriteOnce"]
capacity:
storage: 1Gi
hostPath:
path: /redis01
- kind: PersistentVolume
apiVersion: v1
metadata:
name: redis02
spec:
accessModes: ["ReadWriteOnce"]
capacity:
storage: 1Gi
hostPath:
path: /redis02
- kind: PersistentVolume
apiVersion: v1
metadata:
name: redis03
spec:
accessModes: ["ReadWriteOnce"]
capacity:
storage: 1Gi
hostPath:
path: /redis03
- kind: PersistentVolume
apiVersion: v1
metadata:
name: redis04
spec:
accessModes: ["ReadWriteOnce"]
capacity:
storage: 1Gi
hostPath:
path: /redis04
- kind: PersistentVolume
apiVersion: v1
metadata:
name: redis05
spec:
accessModes: ["ReadWriteOnce"]
capacity:
storage: 1Gi
hostPath:
path: /redis05
- kind: PersistentVolume
apiVersion: v1
metadata:
name: redis06
spec:
accessModes: ["ReadWriteOnce"]
capacity:
storage: 1Gi
hostPath:
path: /redis06
3、创建redis-cluster-service
Ports - service name ‘redis-cluster-service’, port name: ‘client’, port: ‘6379’
Ports - service name ‘redis-cluster-service’, port name: ‘gossip’, port: ‘16379’
Ports - service name ‘redis-cluster-service’, port name: ‘client’, targetPort: ‘6379’
Ports - service name ‘redis-cluster-service’, port name: ‘gossip’, targetPort: ‘16379’
apiVersion: v1
kind: Service
metadata:
name: redis-cluster-service
spec:
ports:
- port: 6379
name: client
targetPort: 6379
- port: 16379
name: gossip
targetPort: 16379
selector:
app: redis-cluster
4、创建集群
kubectl exec -it redis-cluster-0 -- redis-cli --cluster create --cluster-replicas 1 $(kubectl get pods -l app=redis-cluster -o jsonpath='{range.items[*]}{.status.podIP}:6379 {end}')