Java客户端无法连接到运行在本地主机上的Redis Sentinel

Question

我在本地主机上安装了3个Redis Server和3个Redis Sentinel实例。服务器在以下位置运行：

127.0.0.1:6379 // Master
127.0.0.1:6380 // Slave
127.0.0.1:6381 // Slave

哨兵的位置是：

127.0.0.1:5000
127.0.0.1:5001
127.0.0.1:5002

我有一个(Java)客户端，它尝试连接到其中一个前哨，并在redis服务器中设置密钥：

// import statements

public class RedisPush {

    private static final String MASTER_NAME = "mymaster";
    private static final String PASSWORD = "foobared";
    private static final Set sentinels;
    static {
        sentinels = new HashSet();
        sentinels.add("127.0.0.1:5000");
        sentinels.add("127.0.0.1:5001");
        sentinels.add("127.0.0.1:5002");
    }

    public static void pushToRedis() {

        Jedis jedis = null;

        try {
            JedisSentinelPool pool = new JedisSentinelPool(MASTER_NAME, sentinels);
            System.out.println("Fetching connection from pool.");
            jedis = pool.getResource();
            jedis.auth(PASSWORD);
            Socket socket = jedis.getClient().getSocket();

            System.out.println("Connected to " + socket.getRemoteSocketAddress());
            int i = 0;
            while (true) {
                jedis.set("sentinel_key" + i, "value" + i);
                System.out.println(i);
                i++;
                Thread.sleep(1000);
            }

        } catch (Exception e) {
            e.printStackTrace();
        }
        finally {
            if(jedis != null)
                jedis.close();
        }

    }

    public static void main(String[] args) throws Exception {

        while(true) {

            pushToRedis();
            Thread.sleep(1000);
        }
    }
}

最初，我的前哨配置如下(例如，在端口5000上运行的第一个前哨)：

bind 127.0.0.1
port 5000
sentinel monitor mymaster 127.0.0.1 6379 2
sentinel down-after-milliseconds mymaster 5000
sentinel failover-timeout mymaster 60000
sentinel auth-pass mymaster foobared

如果我尝试运行我的(Java)客户端，我得到以下错误：

Nov 23, 2018 1:52:57 AM redis.clients.jedis.JedisSentinelPool initSentinels
INFO: Trying to find master from available Sentinels...
Nov 23, 2018 1:52:57 AM redis.clients.jedis.JedisSentinelPool initSentinels
WARNING: Cannot get master address from sentinel running @ 192.168.0.102:5001. Reason: redis.clients.jedis.exceptions.JedisConnectionException: java.net.ConnectException: Connection refused (Connection refused). Trying next one.
Nov 23, 2018 1:52:57 AM redis.clients.jedis.JedisSentinelPool initSentinels
WARNING: Cannot get master address from sentinel running @ 192.168.0.102:5000. Reason: redis.clients.jedis.exceptions.JedisConnectionException: java.net.ConnectException: Connection refused (Connection refused). Trying next one.
Nov 23, 2018 1:52:57 AM redis.clients.jedis.JedisSentinelPool initSentinels
WARNING: Cannot get master address from sentinel running @ 192.168.0.102:5002. Reason: redis.clients.jedis.exceptions.JedisConnectionException: java.net.ConnectException: Connection refused (Connection refused). Trying next one.
redis.clients.jedis.exceptions.JedisConnectionException: All sentinels down, cannot determine where is mymaster master is running...
    at redis.clients.jedis.JedisSentinelPool.initSentinels(JedisSentinelPool.java:180)
    at redis.clients.jedis.JedisSentinelPool.<init>(JedisSentinelPool.java:95)
    at redis.clients.jedis.JedisSentinelPool.<init>(JedisSentinelPool.java:82)
    at redis.clients.jedis.JedisSentinelPool.<init>(JedisSentinelPool.java:70)
    at redis.clients.jedis.JedisSentinelPool.<init>(JedisSentinelPool.java:44)
    at RedisPush.pushToRedis(RedisPush.java:29)
    at RedisPush.main(RedisPush.java:61)

但是，如果我将我的前哨配置脚本更改为以下脚本：

# bind 127.0.0.1
port 5000
protected-mode no
sentinel monitor mymaster 127.0.0.1 6379 2
sentinel down-after-milliseconds mymaster 5000
sentinel failover-timeout mymaster 60000
sentinel auth-pass mymaster foobared

客户端工作得很好。我不明白为什么。

如果在sentinel.conf文件中没有设置requirepass，并且在sentinel.conf文件中注释了bind，则只有protected-mode将为yes，以避免除localhost之外的任何客户端连接到前哨。在我的第一个前哨配置中，我使用了bind命令，但它仍然不起作用。

为什么注释掉bind并将protected-mode显式设置为no会起作用？

另外，我也尝试过同时使用bind 127.0.0.1和protected-mode no，但即使这样也不起作用。

Answer 1

我遇到过一个类似的问题，Jedis抛出了同样的错误，它与https://github.com/xetorthio/jedis/issues/1367有关

为了解决这个问题，我在我的mac上做了sudo ifconfig lo0 alias 127.0.1.1，然后把我的sentinel.conf改成了bind 127.0.1.1，然后更新了我的yaml for spring data以连接到那个ip

sentinel.nodes: 127.0.1.1:5000, 127.0.1.1:5002, 127.0.1.1:5003

Answer 2

Jedis对Redis Sentinel的支持不是很好。用生菜代替，它有更好的池子管理。并且在springboot上也得到了很好的支持。