Redis cluster on kubernetes

https://charts.bitnami.com/bitnami

仓库中的 redis-cluster 包直接提供了 3个master 和 3个slave的标准集群模式

使用RDM客户端此时是可以正常访问集群模式的，因为 RDM客户端支持

Change host on cluster redirects

不过在这种状态下，绑定 redis 实例的 nodeport 无法使用 python的 redis 包直接访问 需要使用 redis-py-cluster

redis集群在kubernetes 中最主要的麻烦来自于它的 16384 个哈希槽，redis cluster 的客户端需要在各个节点之间进行forward

from rediscluster import RedisCluster
startup_nodes = [{"host": "192.168.194.194", "port": "30002"}]
rc = RedisCluster(startup_nodes=startup_nodes, decode_responses=True, password="f1w6shwtLa")
rc.set("foo", "bar")
print(rc.get("foo"))
print(rc.get("foo"))
print(rc.get("foo"))

还有一个选择是 redis-cluster-proxy

git clone https://github.com/RedisLabs/redis-cluster-proxy.git

make PREFIX=/usr/local/redis_cluster_proxy install 

如果出现错误

../deps/hiredis/libhiredis.a: No such file or directory

root@ubuntu:~/proxy/redis-cluster-proxy# cd deps
root@ubuntu:~/proxy/redis-cluster-proxy/deps# make lua hiredis linenoise

root@ubuntu:~/proxy/docker# cp /usr/local/redis_cluster_proxy/bin/redis-cluster-proxy ./
root@ubuntu:~/proxy/docker# ls
Dockerfile  redis-cluster-proxy
root@ubuntu:~/proxy/docker# cat Dockerfile 
FROM ubuntu
WORKDIR /data
ADD redis-cluster-proxy /usr/local/bin/
EXPOSE 7777
root@ubuntu:~/proxy/docker# 

docker build . -t libaibai/redis-cluster-proxy:v1.0.0

root@ubuntu:~/proxy/k8s# cat configmap.yaml 
---
# Redis-Proxy Config
apiVersion: v1
kind: ConfigMap
metadata:
  name: redis-proxy
  namespace: redis-cluster
data:
  proxy.conf: |
    cluster redis-cluster.redis-cluster.svc:6379     # 配置为Redis Cluster Service
    bind 0.0.0.0
    port 7777   # redis-cluster-proxy 对外暴露端口
    threads 8   # 线程数量
    daemonize no  
    enable-cross-slot yes    
    auth f1w6shwtLa   # 配置Redis Cluster 认证密码  
    log-level error

root@ubuntu:~/proxy/k8s# 

root@ubuntu:~/proxy/k8s# cat deploy.yaml 
---
# Redis-Proxy NodePort
apiVersion: v1
kind: Service
metadata:
  name: redis-proxy
  namespace: redis-cluster
spec:
  type: NodePort # 对K8S外部提供服务
  ports:
  - name: redis-proxy
    nodePort: 30001   # 对外提供的端口
    port: 7777
    protocol: TCP
    targetPort: 7777
  selector:
    app: redis-proxy
---
# Redis-Proxy Deployment
apiVersion: apps/v1
kind: Deployment
metadata:
  name: redis-proxy
  namespace: redis-cluster
spec:
  replicas: 1
  selector:
    matchLabels:
      app: redis-proxy
  template:
    metadata:
      labels:
        app: redis-proxy
    spec:
      imagePullSecrets:
        - name: harbor
      containers:
        - name: redis-proxy
          image: libaibai/redis-cluster-proxy:v1.0.0
          imagePullPolicy: Always
          command: ["redis-cluster-proxy"]
          args:
            - -c
            - /data/proxy.conf   # 指定启动配置文件
          ports:
            - name: redis-7777
              containerPort: 7777
              protocol: TCP
          volumeMounts:
            - name: redis-proxy-conf
              mountPath: /data/
      volumes:   # 挂载proxy配置文件
        - name: redis-proxy-conf
          configMap:
            name: redis-proxy

root@ubuntu:~/proxy/k8s#