Multiple Datastax Agents on one IP

Question

I'm trying to setup datastax agents on separate server to monitor nodes. But I've faced with problem. How to configure multiple agents on one IP address? In agent config I can define only agent_rpc_interface, but can't do this for port. So in this case if I need to monitor 4 nodes, I need 4 interfaces on this server, but I have only one interface. Is there any workarounds on this?
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Still cant find solution for this.
Also, how to get metrics from node? In logs I have

INFO [install-location-finder] 2014-02-20 16:02:42,380 New JMX connection (127.0.0.1:7199)
INFO [install-location-finder] 2014-02-20 16:02:42,388 New JMX connection (127.0.0.1:7199)
INFO [install-location-finder] 2014-02-20 16:02:42,401 New JMX connection (127.0.0.1:7199)

But agent installed on another host, so how to override this address?

Thanks,
Alex

Answer 1

The DataStax Agent is designed to run on the actual Cassandra nodes and monitor with a 1:1 ratio. Hence, there is no way to specify multiple IP addresses.

A typical cluster setup would have:

• 1 OpsCenter node
• N Cassandra nodes, each running Cassandra + DataStax Agent

Answer 2

If you are on linux, you will be able to create a network alias and assign more than one ip addresses to same NIC. For more info check this out http://www.cyberciti.biz/faq/linux-creating-or-adding-new-network-alias-to-a-network-card-nic/