Can't connect to cassandra node from different host - cassandra

Question

I have a cassandra node at a machine. When I access cqlsh from the same machne it works properly.
But when I tried to connect to it's cqlsh using "192.x.x.x" from another machine, I'm getting an error saying
Connection error: ('Unable to connect to any servers', {'192.x.x.x': error(111, "Tried connecting to [('192.x.x.x', 9042)]. Last error: Connection refused")})
What is the reason for this? How can I fix it?

Answer 1

Probably the remote Cassandra node is not bound to the external network interface but to the loopback one (this is the default configuration). You can ensure this by using "telnet thecassandrahost 9042" from the remote machine, it should not work.
In order to bind Cassandra to the external network interface you need to edit the cassandra.yaml configuration file and set the properties "listen_address" and "rpc_address" to your remote IP or "0.0.0.0" (not all versions of Cassandra support wildcard addresses).
Check also that the firewall is properly configured or disabled (sudo service iptables stop).

Answer 2

Set the config parameter where this file is located. Possibly /etc/cassandra/cassandra.yaml.
cassandra.yaml
listen_address: 192.x.x.x
rpc_address: 192.x.x.x
Then, restart the service.

Answer 3

1.Update：./conf/cassandra.yaml
rpc_address: 0.0.0.0 ("0.0.0.0" allow anywhere IP,but you can appoint an IP)
\# broadcast_rpc_address: 1.2.3.4 (Delete comment if rpc_address=0.0.0.0)
2.restart
./bin/cassandra
Case: I met a problem that I can't remote access cassandra When I using java access cassandra

Answer 4

I got the same issue. And I am following answer in this post. Unfortunately, I have no luck to make it work. I did some research. And it works now. Here is my change.
Environment
Ubuntu Server 16.04.3 LTS on VirtualBox,
DSE version 5.1
Install DSE
I am installing DSE follow this page
https://docs.datastax.com/en/dse/5.1/dse-dev/datastax_enterprise/install/installGUIdse.html
Go to /etc/dse/cassandra/cassandra.yaml
Change 'seeds' from 127.0.0.1 to {seriver ip} exp. mine is 172.20.10.9
listen_address
In DSE 5.1 official document says 'Never specify 0.0.0.0; it is always wrong.'
What I did is comment out 'listen_address' setting
'rpc_address' change from localhost to 0.0.0.0
'broadcast_address' change to server IP. Mine is 172.20.10.9
'broadcast_rpc_address' change to server ip
restart dse wait for couple minute,it is changing. If still not work, restart machine.
This is my log in 15 seconds.
`ubuntu08#ubuntu08:~$ nodetool status
nodetool: Failed to connect to '127.0.0.1:7199' - ConnectException: 'Connection refused (Connection refused)'.
ubuntu08#ubuntu08:~$ nodetool status
Error: The node does not have system_traces yet, probably still bootstrapping
ubuntu08#ubuntu08:~$ nodetool status
Datacenter: SearchGraphAnalytics
Status=Up/Down
|/ State=Normal/Leaving/Joining/Moving
-- Address Load Tokens Owns Host ID Rack
UN 10.0.0.44 278.51 KiB 32 ? 19db0016-df63-4470-9921-f3b5fe4e9341 rack1
`
I can access by run 'cqlsh 172.20.10.9' from local or another machine.
This is another document for Cassandra https://docs.datastax.com/en/developer/java-driver/3.3/manual/address_resolution/

Answer 5

I had the same issue, I was not allowed to listen to 0.0.0.0 and Cassandra was running on a VM with Bridged network. The solution I found was to let the VM SSH to itself, port forwarding the port on the bridged network interface to localhost:
ssh -L 192.168.x.x:9042:127.0.0.1:9042 myvmuser#localhost
Since the IP of the bridged network card would change (depending on which developers machine it was run) the ssh-command had to first get the IP, this snipped worked for that:
ifconfig | grep -Eo 'inet (addr:)?([0-9]*\.){3}[0-9]*' | grep -Eo '([0-9]*\.){3}[0-9]*' | grep -v '127.0.0.1'
Also, as this should happen on boot you have to create a SSH key for the vm-user and trust it via .ssh/authorized_keys.

Answer 6

Even after I set the RPC_ADDRESS, it didn't work for me , until I set the -e CASSANDRA_START_RPC=true option.
It was always set to false in my case. I have tried this with Ubuntu, Docker and Cassandra.

Answer 7

Set the following config parameter in cassandra.yaml file (For CentOS it is located in /etc/cassandra/default.conf)
rpc_address: 0.0.0.0
Verify that following values are same as below(usually they are default)
start_native_transport:true
native_transport_port:9042
Last step for CentOS , Update the firewall configuration and allow port 9042 through for incoming connections
Access the firewall from “System / Administration / Firewall” in the CentOS menu
Add the port under “Other Ports”

Answer 8

I edit cassandra.yaml set listen_address and roc_address as ip address resolve the problem.