redis.clients.jedis.exceptions.JedisConnectionException：java.net.UnknownHostException

Question

我正在使用Jedis连接到AWS中的Redis实例/集群，但是我一直收到此错误，这是代码，我在SO上进行了广泛搜索，发现最接近的是：属性文件中的字符串主机名：Java

我尝试了两种方式，都没有为我工作。所以请帮忙。

这是我的Java代码：

public static void main(String[] args) {
    AWSCredentials credentials = null;
    try {
        credentials = new ProfileCredentialsProvider("default").getCredentials();
    } catch (Exception e) {
        throw new AmazonClientException("Cannot load the credentials from the credential profiles file. "
            + "Please make sure that your credentials file is at the correct "
            + "location (/Users/USERNAME/.aws/credentials), and is in valid format.", e);
    }

    AmazonElastiCacheClient client = new AmazonElastiCacheClient(credentials);
    client.setRegion(Region.getRegion(Regions.AP_NORTHEAST_2));
    DescribeCacheClustersRequest dccRequest = new DescribeCacheClustersRequest();
    dccRequest.setShowCacheNodeInfo(true);

    DescribeCacheClustersResult clusterResult = client.describeCacheClusters(dccRequest);
List<CacheCluster> cacheClusters = clusterResult.getCacheClusters();
        for (CacheCluster cacheCluster : cacheClusters) {
        for (CacheNode cacheNode : cacheCluster.getCacheNodes()) {
            String addr = cacheNode.getEndpoint().getAddress();
            int port = cacheNode.getEndpoint().getPort();
            String url =  addr + ":" + port;
            System.out.println("formed url is: " + url);

            Jedis jedis = new Jedis(url);
            System.out.println("Connection to server sucessfully");
            // check whether server is running or not
            System.out.println("Server is running: " + jedis.ping());
        }
    }

上面代码的最后一行不断抛出此错误，这是stacktrace：

Exception in thread "main" redis.clients.jedis.exceptions.JedisConnectionException: java.net.UnknownHostException: REDISNAME.nquffl.0001.apn2.cache.amazonaws.com:6379
at redis.clients.jedis.Connection.connect(Connection.java:207)
at redis.clients.jedis.BinaryClient.connect(BinaryClient.java:93)
at redis.clients.jedis.Connection.sendCommand(Connection.java:126)
at redis.clients.jedis.Connection.sendCommand(Connection.java:121)
at redis.clients.jedis.BinaryClient.ping(BinaryClient.java:106)
at redis.clients.jedis.BinaryJedis.ping(BinaryJedis.java:195)
at sporadic.AmazonElastiCacheClientExample.main(AmazonElastiCacheClientExample.java:70)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:147)Caused by: java.net.UnknownHostException: REDISNAME.nquffl.0001.apn2.cache.amazonaws.com:6379
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:184)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
at java.net.Socket.connect(Socket.java:589)
at redis.clients.jedis.Connection.connect(Connection.java:184)
... 11 more

我究竟做错了什么？请指出。

Answer 1

您的设置应该这样：

Jedis jedis = new Jedis("REDISNAME.nquffl.0001.apn2.cache.amazonaws.com",6379);

不是这样的：

Jedis jedis = new Jedis("REDISNAME.nquffl.0001.apn2.cache.amazonaws.com:6379");