Game of Pods攻略(Redis Islands編)

Game of Pods攻略~Redis Islands~

redisHAクラスターの構築です

Game of Pods関連のソースコードを挙げてます
https://github.com/hayama17/Game-of-Pods

作りたい環境

• Redisクラスター(StatefulSet)
  • NodePort
    • clinet
      • port: 6379
      • targetport: 6379
    • gossip
      • port: 16379
      • targetPort: 16379
  • PV6個
    • /dataをPVCにマウント
  • /confをconfigmapにマウント

PVの作成

6個作る。
一気に作りたかったけどやり方が分らない...

apiVersion: v1
kind: PersistentVolume
metadata:
  name: redis(01~06) #合わせて作る
spec:
  capacity:
    storage: 1Gi
  accessModes:
    - ReadWriteOnce
  hostPath:
    path: /redis(01~06)　#合わせて作る
    type: DirectoryOrCreate

StatefulSetの作成

要件通りに作成

apiVersion: apps/v1
kind: StatefulSet
metadata:
  name: redis-cluster
spec:
  serviceName: redis-cluster
  replicas: 6
  selector:
    matchLabels:
      app: redis
  template:
    metadata: 
      labels: 
        app: redis
    spec:
      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
          ports:
            - name: client
              containerPort: 6379
            - name: gossip
              containerPort: 16379
          volumeMounts:
            - name: conf
              mountPath: /conf
              readOnly: false
            - name: data
              mountPath: /data
              readOnly: false
      volumes:
        - name: conf
          configMap:
            name: redis-cluster-configmap
            defaultMode: 0755
  volumeClaimTemplates:
    - metadata:
        name: data
      spec:
        resources:
          requests:
            storage: 1Gi
        accessModes:
          - ReadWriteOnce

NodePortの作成

apiVersion: v1
kind: Service
metadata:
  name: redis-cluster-service
spec:
  ports:
    - name: client
      port: 6379
      targetPort: 6379
    - name: gossip
      port: 16379
      targetPort: 16379

  selector:
    app: redis

各コンテンナをクラスターとして登録

$ 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 ')

[ERR] Wrong number of arguments for specified --cluster sub command
command terminated with exit code 1

あれ？　動かない...

原因

ラベルが違っていた

yaml app: redis

command app:redis-cluster

解決策

ラベルを変えるだけ

$ kubectl exec -it redis-cluster-0 -- redis-cli --cluster create --cluster-replicas 1 $(kubectl get pods -l app=redis -o jsonpath='{range.items[*]}{.status.podIP}:6379 ')
>>> Performing hash slots allocation on 6 nodes...

.
.
.
Can I set the above configuration? (type 'yes' to accept): yes
>>> Nodes configuration updated
.
.
.
[OK] All 16384 slots covered.

できた！

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