Cannot connect to datastax agent

问题

I am unable to connect to any nodes through opscenter. In opscenter it says that agents need to be connected inorder for opscenter to work. I checked in datastax-agent/agent.log file and found below errors.

ERROR [clojure-agent-send-off-pool-0] 2016-01-27 09:30:54,545 Can't connect to Cassandra (All host(s) tried for query failed (tried: /127.0.0.1:9042 (com.datastax.driver.core.TransportException: [/127.0.0.1:9042] Cannot connect))), retrying soon.

I checked port 9042 and 7199 both are listening..

x.x.x.10:9042   :::*                        LISTEN      497        499005     28550/java

pls advise.. what needs to be checked for this. Thanks

回答1:

Leave broadcast_rpc_address to rpc_address as it is to point to their respective ip address as below: and changing to 0.0.0.0 is not required.

10.154.3.10 - Cassandra.yaml
broadcast_rpc_address: 10.154.3.10
rpc_address: 10.154.3.10


10.154.3.10 - address.yaml
stomp_interface: 10.154.3.XX --> (Mention the IP of opscenter server)
hosts: ["10.154.3.10"]

Restart the datastax-agent, and in agent.log, no errors will be seen.

回答2:

There are few basic settings in cassandra.yaml to tune network connection params.

1. listen_address : localhost

   Address or interface to bind to and tell other Cassandra nodes to connect to. Specifying it to localhost will always do the Right Thing. Setting listen_address to 0.0.0.0 is always wrong

2. rpc_address : 0.0.0.0

   That unlike listen_address, you can specify 0.0.0.0, but you must also set broadcast_rpc_address to a value other than 0.0.0.0

3. broadcast_rpc_address: localhost

   This setting will be usefull probably for redirect conversation between nodes from broadcast_rpc_address to rpc_address (i.e. Machine has two network interfaces)

If all settings is correct for you environment try to connect with console client cqlsh and try to use nodetool for monitoring state of your nodes. After try to run OPC center

来源：https://stackoverflow.com/questions/35043183/cannot-connect-to-datastax-agent