k8s部署Redis集群，节点重启pod IP变化，Java代码不能自动连接到新的pod IP，如何自动刷新？

问题描述：

k8s部署redis集群，节点重启pod ip变化，java代码不能自动获取到新的pod ip，导致redis集群不可用。
技术栈：spring cloud
目前是通过JedisCluster获取到redis集群的节点，再配置到redis集群。


try (JedisCluster jedisCluster = new JedisCluster(ipAndPortSet, 10000, 10000, RedisConstants.MAX_RE_DIRECTIONS, password, new JedisPoolConfig())) {
    Map<String, JedisPool> jedisPoolMap = jedisCluster.getClusterNodes();
    for (String hostAndPort : jedisPoolMap.keySet()) {
        String[] hostAndPortArray = hostAndPort.split(":");
         RedisNode redisNode = new RedisNode(hostAndPortArray[0], Integer.parseInt(hostAndPortArray[1]));
         redisNodes.add(redisNode);
    }
}

RedisClusterConfiguration redisClusterConfiguration = new RedisClusterConfiguration();
redisClusterConfiguration.setClusterNodes(redisNodes);
redisClusterConfiguration.setPassword(password);
redisClusterConfiguration.setMaxRedirects(RedisConstants.MAX_RE_DIRECTIONS);
return new LettuceConnectionFactory(redisClusterConfiguration, lettuceClientConfiguration);

答

Redis Cluster · lettuce-io/lettuce-core Wiki · GitHub Advanced Java Redis client for thread-safe sync, async, and reactive usage. Supports Cluster, Sentinel, Pipelining, and codecs. - Redis Cluster · lettuce-io/lettuce-core Wiki

https://github.com/lettuce-io/lettuce-core/wiki/Redis-Cluster

使用这种方式配置k8s容器板redis 集群。

针对集群节点发生变化，使用lettuce自适应刷新

        GenericObjectPoolConfig genericObjectPoolConfig = new GenericObjectPoolConfig();
        genericObjectPoolConfig.setMaxTotal(redisPropertiesConfig.getPoolMaxTotal());
        genericObjectPoolConfig.setMaxIdle(redisPropertiesConfig.getPoolMaxIdle());
        genericObjectPoolConfig.setMinIdle(redisPropertiesConfig.getPoolMinIdle());

        //支持自适应集群拓扑试图刷新
        ClusterTopologyRefreshOptions clusterTopologyRefreshOptions = ClusterTopologyRefreshOptions.builder()
                //.enablePeriodicRefresh(Duration.ofSeconds(5))
                .enableAllAdaptiveRefreshTriggers()
                .adaptiveRefreshTriggersTimeout(Duration.ofSeconds(30))
                //.enablePeriodicRefresh(Duration.ofSeconds(10))
                .build();

        ClusterClientOptions clusterClientOptions = ClusterClientOptions.builder()
                .timeoutOptions(TimeoutOptions.enabled(Duration.ofSeconds(connTimeout)))
                .autoReconnect(true)
                //.pingBeforeActivateConnection(Boolean.TRUE)
                //.cancelCommandsOnReconnectFailure(Boolean.TRUE)
                //.disconnectedBehavior(ClientOptions.DisconnectedBehavior.REJECT_COMMANDS)
                .topologyRefreshOptions(clusterTopologyRefreshOptions).build();

        LettuceClientConfiguration lettuceClientConfiguration = LettucePoolingClientConfiguration.builder()
                .poolConfig(genericObjectPoolConfig)
                //.readFrom(ReadFrom.NEAREST)
                .clientOptions(clusterClientOptions).build();

        RedisClusterConfiguration redisClusterConfiguration = new RedisClusterConfiguration(Arrays.asList(serversArray));
        redisClusterConfiguration.setPassword(password);
        redisClusterConfiguration.setMaxRedirects(RedisConstants.MAX_RE_DIRECTIONS);
        lettuceConnectionFactory = new LettuceConnectionFactory(redisClusterConfiguration, lettuceClientConfiguration);
        return lettuceConnectionFactory;

答

正常不应该用service的DNS代替IP？或者service加StatefulSet控制器赋予集群POD独立DNS记录？

k8s部署Redis集群，节点重启pod IP变化，Java代码不能自动连接到新的pod IP，如何自动刷新？

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