Kubernetes Redis Cluster问题

我正在尝试使用centos上的kubernetes创建redis集群.我让我的kubernetes master在一个主机上运行,​​而kubernetes slave在两个不同的主机上运行.

etcdctl get /kube-centos/network/config

{ "Network": "172.30.0.0/16", "SubnetLen": 24, "Backend": { "Type": "vxlan" } }

这是我的复制控制器

apiVersion: v1
kind: ReplicationController
metadata:
  name: redis-master
  labels:
  app: redis
  role: master
  tier: backend
spec:
  replicas: 6
  template:
    metadata:
      labels:
        app: redis
        role: master
        tier: backend
    spec:
      containers:
      - name: master
        image: redis
        command: 
          - "redis-server"
        args:
          - "/redis-master/redis.conf"
        ports:
        - containerPort: 6379
        volumeMounts:
        - mountPath: /redis-master
          name: config
        - mountPath: /redis-master-data 
          name: data
        volumes:
        - name: data
          emptyDir: {}
        - name: config
          configMap:
            name: redis-config
            items:
            - key: redis-config
              path: redis.conf    

kubectl create -f rc.yaml

NAME                           READY     STATUS    RESTARTS   AGE       IP            NODE
redis-master-149tt             1/1       Running   0          8s        172.30.96.4   centos-minion-1
redis-master-14j0k             1/1       Running   0          8s        172.30.79.3   centos-minion-2
redis-master-3wgdt             1/1       Running   0          8s        172.30.96.3   centos-minion-1
redis-master-84jtv             1/1       Running   0          8s        172.30.96.2   centos-minion-1
redis-master-fw3rs             1/1       Running   0          8s        172.30.79.4   centos-minion-2
redis-master-llg9n             1/1       Running   0          8s        172.30.79.2   centos-minion-2

使用Redis-config文件

appendonly yes
cluster-enabled yes
cluster-config-file /redis-master/nodes.conf
cluster-node-timeout 5000
dir /redis-master
port 6379

我使用以下命令来创建kubernetes服务.

kubectl expose rc redis-master –name=redis-service –port=6379 –target-port=6379 –type=NodePort

Name:           redis-service
Namespace:      default
Labels:         app=redis
                role=master
                tier=backend
Selector:       app=redis,role=master,tier=backend
Type:           NodePort
IP:             10.254.229.114
Port:           <unset> 6379/TCP
NodePort:       <unset> 30894/TCP
Endpoints:      172.30.79.2:6379,172.30.79.3:6379,172.30.79.4:6379 + 3     more...
Session Affinity:   None
No events.

现在我已经启动并运行了所有pod和服务.我正在使用redis-trib pod来创建redis集群.

kubectl exec -it redis-trib bash

./redis-trib.rb create –replicas 1 172.30.79.2:6379 172.30.79.3:6379 172.30.79.4:6379 172.30.96.2:6379 172.30.96.3:6379 172.30.96.4:6379

使用以下消息按预期创建Redis群集.

[OK] All 16384 slots covered.

现在,我应该可以从网络中的任何主机访问kubernetes节点IP(192.168.240.116)和nodePort(30894)上的redis-cluster.当我从其中一个kubernetes节点执行以下命令时,一切都按预期工作.

redis-cli -p 30894 -h 192.168.240.116 -c

192.168.240.116:30894> set foo bar
-> Redirected to slot [12182] located at 172.30.79.4:6379
OK
172.30.79.4:6379> 

当我从同一网络中的不同(非kubernetes)节点运行相同的命令时,我看到连接的超时错误.

redis-cli -c -p 30894 -h 192.168.240.116

192.168.240.116:30894> set foo bar
-> Redirected to slot [12182] located at 172.30.79.4:6379
Could not connect to Redis at 172.30.79.4:6379: Connection timed out

使用NodePort服务类型公开时,是否无法访问kubernetes集群网络外的redis-cluster?

此外,我不能使用LoadBalancer服务类型,因为我没有在云上托管它.

我一直坚持这个问题.有人可以建议我应该使用什么方法来访问我网络外的redis-cluster?

谢谢

最佳答案 运行./redis-trib.rb创建–replicas 1 172.30.79.2:6379 172.30.79.3:6379 172.30.79.4:6379 172.30.96.2:6379 172.30.96.3:6379 172.30.96.4:6379对此没有意义建立.

端口6379只能通过您提供的服务访问,但不能直接尝试.这就是您尝试使用设置时遇到问题的原因.

你可以做的是用它自己的服务公开每个POD,并有一个额外的集群服务来加载外部请求.如example repository from Kelsey Hightower所示.这样POD可以通过内部公开的端口进行通信,而(外部)客户端可以使用负载均衡的集群端口.这意味着每个POD都需要它自己的ReplicaSet(或部署). Kelsey在YouTube上提供了长篇演讲,解释了设置 – YouTube/Slideshare.

另一种方法是使用单个redis master,如其他示例所示.

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