问题
I am trying to connect to DAX from a localhost using the following code:
ClientConfig daxConfig = new ClientConfig()
.withEndpoints("dax-cluster.yhdqu5.clustercfg.dax.use1.cache.amazonaws.com:8111");
AmazonDaxClient client = new ClusterDaxClient(daxConfig);
The cluster is up and running, I've created it in a public subnet and opened port 8111 in the security group, but despite this I receive the following exception:
Caused by: java.io.IOException: No endpoints available
at com.amazon.dax.client.cluster.Cluster.leaderClient(Cluster.java:560)
at com.amazon.dax.client.dynamodbv2.ClusterDaxClient$3.getClient(ClusterDaxClient.java:154)
at com.amazon.dax.client.dynamodbv2.ClusterDaxClient$RetryHandler.makeRequestWithRetries(ClusterDaxClient.java:632)
... 10 more
Suppressed: java.io.IOException: No endpoints available
... 13 more
Suppressed: java.io.IOException: No endpoints available
... 13 more
Other answers on StackOverflow suggest that this may be caused by incorrectly configured security group and to test it I've launched an instance in the same VPC/subnet and used the same security group and I was able to ssh to this host (both 22nd and 8111-st ports are opened in the security group). So there should be some other DAX related reason.
The firewall on my machine is turned off.
But if I ssh to a machine in EC2, then I can connect to the DAX cluster:
[ec2-user@ip-10-0-0-44 ~]$ nc -z dax-cluster.yhdqu5.clustercfg.dax.use1.cache.amazonaws.com 8111
Connection to dax-cluster.yhdqu5.clustercfg.dax.use1.cache.amazonaws.com 8111 port [tcp/*] succeeded!
回答1:
You can only connect to DAX from an EC2 machine in the same VPC as the DAX cluster. Unless your localhost is an EC2 instance in the same VPC, it won't be able to connect to the DAX cluster.
回答2:
If you are making call from your lambda, make sure you have the lambda running with in the same vpc, it has granted iam role to access dax and it has opened the dax port for the security group
来源：https://stackoverflow.com/questions/46026610/amazon-dax-client-throws-no-endpoints-available-exception