(Kubernetes) - redis cluster statefulset예제

🍳머리말

redis cluster를 k8s환경에 statefulset으로 배포하는 예제 file입니다.

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📕 Prerequisite

📔 k8s cluster

📔 redis image

DNS로 cluster create하는 것은 redis 7부터 지원합니다.

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📕 ConfigMap, Service, StatefulSet 작성

📔 yaml

apiVersion: v1
kind: ConfigMap
metadata:
  name: redis-cluster
  namespace: redis
  labels:
    app: redis-cluster
data:
  fix-ip.sh: |
    #!/bin/sh
    CLUSTER_CONFIG="/data/nodes.conf"
    if [ -f ${CLUSTER_CONFIG} ]; then
      if [ -z "${POD_IP}" ]; then
        echo "Unable to determine Pod IP address!"
        exit 1
      fi
      echo "Updating my IP to ${POD_IP} in ${CLUSTER_CONFIG}"
      sed -i.bak -e "/myself/ s/[0-9]\{1,3\}\.[0-9]\{1,3\}\.[0-9]\{1,3\}\.[0-9]\{1,3\}/${POD_IP}/" ${CLUSTER_CONFIG}
    fi
    exec "$@"
  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 no
    save ""
    protected-mode no
---
apiVersion: v1
kind: Service
metadata:
  name: redis-cluster
  namespace: redis
  labels:
    app: redis-cluster
spec:
  ports:
  - port: 6379
    targetPort: 6379
    name: client
  - port: 16379
    targetPort: 16379
    name: gossip
  type: ClusterIP
  selector:
    app: redis-cluster
---
apiVersion: apps/v1
kind: StatefulSet
metadata:
  name: redis-cluster
  namespace: redis
  labels:
    app: 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:6.2-rc
        ports:
        - containerPort: 6379
          name: client
        - containerPort: 16379
          name: gossip
        command: ["/conf/fix-ip.sh", "redis-server", "/conf/redis.conf"]
        readinessProbe:
          exec:
            command:
            - sh
            - -c
            - "redis-cli -h $(hostname) ping"
          initialDelaySeconds: 15
          timeoutSeconds: 5
        livenessProbe:
          exec:
            command:
            - sh
            - -c
            - "redis-cli -h $(hostname) ping"
          initialDelaySeconds: 20
          periodSeconds: 3
        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
      labels:
        name: redis-cluster
    spec:
      accessModes: [ "ReadWriteOnce" ]
      #storageClassName: efs-sc
      resources:
        requests:
          storage: 100Mi

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