K8S/Rancher安装部署redis有状态集群应用

建议在后台使用命令行创建redis集群服务，也可以将yaml文件导入到rancher的UI平台上执行，即可完成redis集群有状态应用

1.创建存储类

vi storageclass.yaml
apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:
  name: redis-cluster  #更改为应用引入的存储类名称
provisioner: kubernetes.io/no-provisioner
volumeBindingMode: WaitForFirstConsumer
# Supported policies: Delete, Retain
reclaimPolicy: Delete

kubectl apply -f storageclass.yaml

2.创建pv；注意name和存储storage大小

注意NFS的路径需要提前创建好，以下IP地址为NFS服务器的IP地址

vi redis-pv.yaml
apiVersion: v1
kind: PersistentVolume
metadata:
  name: redis-pv1
spec:
  capacity:
    storage: 1Gi
  accessModes: 
  - ReadWriteOnce
  persistentVolumeReclaimPolicy: Recycle
  storageClassName: "redis-cluster"
  nfs:
    path: /nfs/redis-cluster/pv1
    server: 10.0.0.1
---  
apiVersion: v1
kind: PersistentVolume
metadata:
  name: redis-pv2
spec:
  capacity:
    storage: 1Gi
  accessModes: 
  - ReadWriteOnce
  persistentVolumeReclaimPolicy: Recycle
  storageClassName: "redis-cluster"
  nfs:
    path: /nfs/redis-cluster/pv2
    server: 10.0.0.1
---
apiVersion: v1
kind: PersistentVolume
metadata:
  name: redis-pv3
spec:
  capacity:
    storage: 1Gi
  accessModes: 
  - ReadWriteOnce
  persistentVolumeReclaimPolicy: Recycle
  storageClassName: "redis-cluster"
  nfs:
    path: /nfs/redis-cluster/pv3
    server: 10.0.0.1
---
apiVersion: v1
kind: PersistentVolume
metadata:
  name: redis-pv4
spec:
  capacity:
    storage: 1Gi
  accessModes: 
  - ReadWriteOnce
  persistentVolumeReclaimPolicy: Recycle
  storageClassName: "redis-cluster"
  nfs:
    path: /nfs/redis-cluster/pv4
    server: 10.0.0.1
---
apiVersion: v1
kind: PersistentVolume
metadata:
  name: redis-pv5
spec:
  capacity:
    storage: 1Gi
  accessModes: 
  - ReadWriteOnce
  persistentVolumeReclaimPolicy: Recycle
  storageClassName: "redis-cluster"
  nfs:
    path: /nfs/redis-cluster/pv5
    server: 10.0.0.1
---
apiVersion: v1
kind: PersistentVolume
metadata:
  name: redis-pv6
spec:
  capacity:
    storage: 1Gi
  accessModes:
  - ReadWriteOnce
  persistentVolumeReclaimPolicy: Recycle
  storageClassName: "redis-cluster"
  nfs:
    path: /nfs/redis-cluster/pv6
    server: 10.0.0.1

kubectl apply -f redis-pv.yaml

3.创建应用

vi redis-sts.yaml
apiVersion: v1
kind: ConfigMap
metadata:
  name: redis-cluster
data:
  update-node.sh: |
    #!/bin/sh
    REDIS_NODES="/data/nodes.conf"
    sed -i -e "/myself/ s/[0-9]\{1,3\}\.[0-9]\{1,3\}\.[0-9]\{1,3\}\.[0-9]\{1,3\}/${POD_IP}/" ${REDIS_NODES}
    exec "$@"
  redis.conf: |+
    cluster-enabled yes
    cluster-require-full-coverage no
    cluster-node-timeout 15000
    cluster-config-file /data/nodes.conf
    cluster-migration-barrier 1
    appendonly yes
    protected-mode no
---
apiVersion: apps/v1
kind: StatefulSet
metadata:
  name: redis-cluster
spec:
  serviceName: redis-cluster
  replicas: 6
  selector:
    matchLabels:
      app: redis-cluster
  template:
    metadata:
      labels:
        app: redis-cluster
    spec:
      containers:
      - name: redis
        image: redis:6.0.4-alpine
        ports:
        - containerPort: 6379
          name: client
        - containerPort: 16379
          name: gossip
        command: ["/conf/update-node.sh", "redis-server", "/conf/redis.conf"]
        env:
        - name: POD_IP
          valueFrom:
            fieldRef:
              fieldPath: status.podIP
        volumeMounts:
        - name: conf
          mountPath: /conf
          readOnly: false
        - name: data
          mountPath: /data
          readOnly: false
      volumes:
      - name: conf
        configMap:
          name: redis-cluster
          defaultMode: 0755
  volumeClaimTemplates:
  - metadata:
      name: data
    spec:
      accessModes: [ "ReadWriteOnce" ]
      resources:
        requests:
          storage: 1Gi
      storageClassName: redis-cluster

kubectl apply -f redis-sts.yaml

4.创建svc

vi redis-svc.yaml
apiVersion: v1
kind: Service
metadata:
  name: redis-cluster
spec:
  type: ClusterIP
  ports:
  - port: 6379
    targetPort: 6379
    name: client
  - port: 16379
    targetPort: 16379
    name: gossip
  selector:
    app: redis-cluster

kubectl apply -f redis-svc.yaml

5.创建redis集群：前三个节点成为主节点，后三个节点成为从节点

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 ')