I am trying to enable cassandra access from other hosts.
I updated the cassandra.yaml listen_address and rpc_address to the host IP v4 address.
as specified in the doc
From
listen_address: localhost
rpc_address: localhost
To
listen_address: cassandra_host_ipv4_address
rpc_address: cassandra_host_ipv4_address
I restarted cassandra to pick the configs.
The nodetool status command shows correctly
Datacenter: DC1
===============
Status=Up/Down
|/ State=Normal/Leaving/Joining/Moving
-- Address Load Tokens Owns Host ID Rack
UN cassandra_host_ipv4_address 204.8 KiB 8 ? null r1
I tried connecting from the same cassandra host before trying with other hosts using
cqlsh
cqlsh localhost
cqlsh cassandra_host_ipv4_address
All of them failed with
Connection error: ('Unable to connect to any servers', {'ip-v4-address': error(111, "Tried connecting to [('ip-v4-address', 9042)]. Last error: Connection refused")})
I tried checking the logs but only gc.log.0.current exist?
Does anyone know how to expose cassandra such that it can be connected from different host.
Related
I installed Cassandra DB on my Ubuntu VM1 and also installed on other VM Ubuntu VM2.
MY question is:
How to initialize multi node cluster (single data-center) on my VM's?
I also changed my Cassandra.yaml like below:
IP default to IP system seed , listen_address.
cluster_name: 'MyDigitalOceanCluster'
initial_token: 0
seed_provider:
seeds: "198.211.50.0"
listen_address: 198.211.50.0
rpc_address: 0.0.0.0
endpoint_snitch: RackInferringSnitch
After the changes I received this message:
Connection error: ('Unable to connect to any servers', {'127.0.0.1':
error(111, "Tried connecting to [('127.0.0.1', 9042)]. Last error:
Connection refused")})
Aaron has pretty much given you the answers but for what it's worth set the following in cassandra.yaml:
num_tokens: 16 or if you prefer to specify tokens, make sure you pick tokens which are balanced
listen_address: private_ip
rpc_address: public_ip (or same IP if your VM only has 1 NIC)
set seeds to the IP of both nodes (1 of the nodes is sufficient but 2 is preferred)
endpoint_snitch: GossipingPropertyFileSnitch is recommended and almost always the right choice (see my reasons here https://community.datastax.com/questions/8887/)
When connecting with cqlsh, you need to specify the node's client IP (rpc_address) otherwise it will default to localhost (127.0.0.1). For example:
$ cqlsh 198.211.50.0
Cheers!
I'm setting up a 3 node Cassandra cluster and after installing
cassandra I tried to connect to cassandra using 'cqlsh'
I'm not able to connect to cassandra db terminal.
rammady#deb-cassandra-ram-1:~$ cqlsh 10.142.0.76 Connection error:
('Unable to connect to any servers', {'127.0.0.1': error(111, "Tried
connecting to [('127.0.0.1', 9042)]. Last error: Connection
refused")})
I've modified cassandra.yaml file and provided 1: private ip address
under seed -seed:10.142.0.75,10.142.0.76,10.142.0.77 2:
listen_address: 10.142.0.75 3: rpc_address: 10.142.0.75
You need to connect to the ip you defined in the config:
cqlsh 10.142.0.75
netstat -tulpn would show you, that the node is listening not on the loopback if.
I have two Ubuntu 16.04 nodes on which I installed Cassandra 3.11.3 with java version "1.8.0_181". I want to merge these two nodes into a Cassandra cluster. Their intern ips are 172.16.10.20 and 172.16.10.30.
on each /etc/cassandra/cassandra.yaml file I modified the following lines:
cluster_name: 'my_cluster'
- seeds: "172.16.10.20,172.16.10.30"
listen_address: XXXX
rpc_address: XXXX
where XXXX is respectively the intern ip of the current node.
I then restart Cassandra on each node
sudo service cassandra restart
and check that Cassandra runs :
sudo service cassandra status
cassandra.service - LSB: distributed storage system for structured data
Loaded: loaded (/etc/init.d/cassandra; generated)
Active: active (running) since Wed 2018-08-08 00:31:42 UTC; 3s ago
Docs: man:systemd-sysv-generator(8)
and the cluster
nodetool status
Datacenter: dc1
===============
Status=Up/Down
|/ State=Normal/Leaving/Joining/Moving
-- Address Load Tokens Owns (effective) Host ID Rack
UN 172.16.10.20 190.11 KiB 256 100.0% 84dded4c-c74e-45f4-9481-ff837fec229d rack1
UN 172.16.10.30 265.06 KiB 256 100.0% 4695fef4-70c7-46b2-a0bd-8b752fe5beb6 rack1
Everything is up and normal.
I want to connect now to Cassandra:
cqlsh
and get:
Connection error: ('Unable to connect to any servers', {'127.0.0.1': error(111, "Tried connecting to [('127.0.0.1', 9042)]. Last error: Connection refused")})
Some googling later, I want to start cassandra by hand
cassandra
and get (among a huge message):
ERROR [main] 2018-08-07 23:02:51,365 CassandraDaemon.java:708 - Port already in use: 7199; nested exception is:
java.net.BindException: Address already in use (Bind failed)
It looks like the port 7199 is already in use. I kill the corresponding pid, change in /etc/cassandra/cassandra-env.sh the JMX_PORT to 7200... same issue, the port is said to be in use, plus the error
00:33:06,236 |-ERROR in ch.qos.logback.core.rolling.RollingFileAppender[SYSTEMLOG] - openFile(/var/log/cassandra/system.log,true) call failed. java.io.FileNotFoundException: /var/log/cassandra/system.log (Permission denied)
I have changed the permission, but the error remains. At this point of the story I am running out of ideas. What I am trying to achieve seem pretty straighforward so I guess others must have run into a similar issue.
The nodetool status output says it all here. You had everything running just fine. So revert any changes in terms of port usage.
As your nodetool status reveals that your node IPs are 172.16.10.20 and 172.16.10.30, try running cqlsh and providing one of those IPs. cqlsh tries to connect to 127.0.0.1 by default, which will not work in a plural node cluster.
cqlsh 172.16.10.20 -u yourusername -p yourpassword
Note: You can omit -u and -p if you don't have auth enabled. But if that's true, then you should really change your cluster to enable auth.
I have deployed a 4 node datastax cluster in GCP. I can ssh into each of the VM nodes but cqlsh is not recognized.Can you please help me to understand where I am going wrong
error:
Connection error: ('Unable to connect to any servers',
{'127.0.0.1': error(111, "Tried connecting to [('127.0.0.1',
9042)]. Last error: Connection refused")})
If your cluster is working correctly, then the nodes must know about each other by their own IPs (internal or external). So Cassandra isn't configured to bind 9042 to 127.0.0.1, which means trying to cqlsh to 127.0.0.1:9042 won't work.
One way to check, would be just to do a nodetool status, and use one of those IP addresses. But, as you're on GCP, you may have both internal and external IP addresses, so in that case it really depends on which IP is set as your broadcast_rpc_address. You can check them all by grepping your cassandra.yaml.
$ grep "_address:" cassandra.yaml
listen_address: 192.168.1.3
broadcast_address: 10.20.15.1
# listen_on_broadcast_address: false
rpc_address: 192.168.1.3
broadcast_rpc_address: 10.20.15.1
In this case, your cqlsh command would look something like this:
cqlsh 10.20.15.1 -u youruser -p yourpassword
I am using mac osx. i created 3 virtual box by virtualbox. I've installed centos7 minimal version on each of the virtual box.
Then i installed cassandra on each of the box. After installation it was starting by cqlsh and nodetool status command.
But after then when i was trying to link each other and edit cassandra.yaml file its started showing
('Unable to connect to any servers', {'127.0.0.1': error(111, "Tried connecting to [('127.0.0.1', 9042)]. Last error: Connection refused")})
i've edited the cassandra.yaml file as follows:
cluster_name: 'Home Cluster'
num_tokens: 256
partitioner: org.apache.cassandra.dht.Murmur3Partitioner
- seeds: "192.168.56.102,192.168.56.103"
storage_port: 7000
listen_address: 192.168.56.102
rpc_address: 192.168.56.102
rpc_port: 9160
endpoint_snitch: SimpleSnitch
my /etc/hosts file contains:
192.168.56.102 node01
192.168.56.103 node02
192.168.56.104 node03
Please tell me whats wrong i'm doing? My cassandra cluster not working.
solution: I got the solution from AKKI. The problem was enpoint_snitch. I made the endpoint_snitch=GossipingPropertyFileSnitch and it fixed. My now output is as follows:
[root#dbnode2 ~]# nodetool status
Datacenter: dc1
===============
Status=Up/Down
|/ State=Normal/Leaving/Joining/Moving
-- Address Load Tokens Owns (effective) Host ID Rack
UN 192.168.56.101 107.38 KB 256 62.5% 0526a2e1-e6ce-4bb4-abeb-b9e33f72510a rack1
UN 192.168.56.102 106.85 KB 256 73.0% 0b7b76c2-27e8-490f-8274-571d00e60c20 rack1
UN 192.168.56.103 83.1 KB 256 64.5% 6c8d80ec-adbb-4be1-b255-f7a0b63e95c2 rack1
I had faced similar problem,
I tried the following solution:
In Cassandra.yaml file check if you have,
start_rpc = true
Changed my endpoint snitch to
endpoint_snitch: GossipingFilePropertySnitch
Opened all ports Cassandra uses on my CentOS
Cassandra inter-node ports
Port number Description
7000 Cassandra inter-node cluster communication.
7001 Cassandra SSL inter-node cluster communication.
7199 Cassandra JMX monitoring port.
Cassandra client port
Port number Description
9042 Cassandra client port.
9160 Cassandra client port (Thrift).
Command to open ports on CentOs 7(Find it according to your OS):
>sudo firewall-cmd --zone=public --add-port=9042/tcp --permanent
>sudo firewall-cmd –reload
Then Restart your systems
Also it seems that you are changing the Cassandra.Yaml file after starting cassandra.
Make sure you edit your Cassandra.yaml file on all nodes before starting Cassandra
Also remember to start the seed node first.