How do I initialize a multi-node Cassandra cluster?

Question

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")})

Just wondering, because an IP address should really be specified with cqlsh. Also, the seeds: parameter should have both IP addresses (in a 2 node cluster, I'd make them both seed nodes). — Aaron
– Aaron, Commented Jan 19, 2021 at 18:52

Erick Ramirez · Accepted Answer · 2021-01-20 06:38:15Z

2

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!

answered Jan 20, 2021 at 6:38

Erick Ramirez

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2 Comments

jourg Over a year ago

thank you so much, but i dont understand. i mean i changed cassandra yaml like this: 1- listen_address: private_ip 2- seed: other node private_ip 3- rpc_address: private_ip and I'm working on my local VM and i dont have any public address? what do you mean when you are talking about public address because i dont have any public_ip ???? what can i do now?????

Erick Ramirez Over a year ago

As I stated in my answer, you can use the same IP for both listen_address and rpc_address if your VM only has 1 NIC. Cheers!

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